71 Sentences With "analog to digital conversion"

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ADC/DAC refers to the processes Analog to Digital Conversion and Digital to Analog Conversion.
Sony is betting the table's analog-to-digital conversion and flexibility will differentiate it from other, similar offerings.
That then goes through an analog-to-digital conversion to turn the electrical charges into a series of 1s and 0s.
Noise reduction (NR) is the process that every digital camera system uses to remove the multi-colored speckle that's a typical byproduct of a (relatively) tiny sensor, heat and the analog-to-digital conversion process.
It is launching a new turntable called "Stir it Up." The $229 device features analog to digital conversion via a USB port, allowing records to be recorded and stored digitally, and is constructed from environmentally sustainable material.
In addition, CHBC, CHEK and CJNT have since converted to digital signals due to the 2011 analog-to- digital conversion.
During her tenure she designed and developed one of the first analog-to- digital conversion systems that could convert analog signals from electroencephalograms (EEG) to digital signals.
Due to the Mexican analog-to-digital conversion mandate, XHTIT-TV shut down its analog signal on May 28, 2013, and then again on July 18, 2013. Tijuana was the first Mexican city where the analog to digital conversion took place. XHTIT retained its virtual channel of 21 after October 2016 because channel 7 would create a channel conflict with KABC-TV over portions of San Diego County.
Bernard Marshall Gordon (born 1927 in Springfield, Massachusetts) is an American engineer, inventor, entrepreneur, and philanthropist. He is considered "the father of high-speed analog-to-digital conversion".
Bob Adams, Technical Fellow at Analog Devices, Inc.Robert Whitlock Adams is a Technical Fellow at Analog Devices, Inc. (ADI) in Wilmington, Massachusetts. His focus is on signal processing and analog-to-digital conversion for professional audio.
The study of image formation encompasses the radiometric and geometric processes by which 2D images of 3D objects are formed. In the case of digital images, the image formation process also includes analog to digital conversion and sampling.
Several sources of power consumption in sensors are: signal sampling and conversion of physical signals to electrical ones, signal conditioning, and analog-to-digital conversion. Spatial density of sensor nodes in the field may be as high as 20 nodes per cubic meter.
The first step in any signal processing approach is analog to digital conversion. The geophysical signals in the analog domain has to be converted to digital domain for further processing. Most of the filters are available in 1D as well as 2D.
A/D conversion and pass-through The TRV950 has a fully functional analog to digital conversion and pass-through unlike the TRV900. The TRV900 will allow you to record from an analog source but will not directly convert the analog signal into DV when connected to a firewire port.
Audio latency is the delay between when an audio signal enters and when it emerges from a system. Potential contributors to latency in an audio system include analog-to-digital conversion, buffering, digital signal processing, transmission time, digital-to-analog conversion and the speed of sound in air.
Most analog transmissions fall into one of several categories. Telephony and voice communication was originally primarily analog in nature, as was most television and radio transmission. Early telecommunication devices utilized analog-to-digital conversion devices called modulator/demodulators, or modems, to convert analog signals to digital signals and back.
A related phenomenon is dithering applied to analog signals before analog-to-digital conversion. Stochastic resonance can be used to measure transmittance amplitudes below an instrument's detection limit. If Gaussian noise is added to a subthreshold (i.e., immeasurable) signal, then it can be brought into a detectable region.
Due to the Mexican analog to digital conversion mandate, XHBJ-TV discontinued its analog signal on May 28, 2013. Tijuana was the first city where the analog to digital conversion begins in Mexico. However, due to penetration problems and impending local elections the other television stations restored their analog signals again two days after (to turn them off again in August), with the exception of XHBJ. Because of the presence of KCAL-TV in the nearby Los Angeles market on channel 9, XHBJ-TDT was unable to take the channel 9 virtual channel assignment Nu9ve holds throughout the rest of Mexico and the station continued to use its pre-digital virtual channel of 45.
It may also be an analog signal such as a phone call or a video signal, digitized into a bit-stream, for example, using pulse-code modulation (PCM) or more advanced source coding (analog-to-digital conversion and data compression) schemes. This source coding and decoding is carried out by codec equipment.
An ATSC tuner works by generating audio and video signals that are picked up from over-the-air broadcast television. ATSC tuners provide the following functions: selective tuning; demodulation; transport stream demultiplexing; decompression; error correction; analog-to-digital conversion; AV synchronization; and media reformatting to fit the specific type of TV screen optimally.
In 2009, KWBN left channel 44 and moved to channel 43 when the analog to digital conversion was completed. On April 13, 2017, the FCC announced that KWBN would relocate to RF channel 26 by April 12, 2019 as a result of the broadcast incentive auction. The move was completed in December 2018.
In analog-to- digital conversion a quantization error occurs. This error is either due to rounding or truncation. When the original signal is much larger than one least significant bit (LSB), the quantization error is not significantly correlated with the signal, and has an approximately uniform distribution. The RMS error therefore follows from the variance of this distribution.
The DCT is widely implemented in digital signal processors (DSP), as well as digital signal processing software. Many companies have developed DSPs based on DCT technology. DCTs are widely used for applications such as encoding, decoding, video, audio, multiplexing, control signals, signaling, and analog-to-digital conversion. DCTs are also commonly used for high-definition television (HDTV) encoder/decoder chips.
Modem manufacturers discovered that, while the analog to digital conversion could not preserve higher speeds, digital to analog conversions could. Because it was possible for an ISP to obtain a direct digital connection to a telco, a digital modem - one that connects directly to a digital telephone network interface, such as T1 or PRI - could send a signal that utilized every bit of bandwidth available in the system. While that signal still had to be converted back to analog at the subscriber end, that conversion would not distort the signal in the same way that the opposite direction did. For this same reason, while 56k did permit 56kbit/s downstream (from ISP to subscriber), the same speed was never achieved in the upstream (from the subscriber to the ISP) direction, because that required going through an analog-to-digital conversion.
The voltage pulses produced for every gamma ray that interacts within the detector volume are then analyzed by a multichannel analyzer (MCA). It takes the transient voltage signal and reshapes it into a Gaussian or trapezoidal shape. From this shape, the signal is then converted into a digital form. In some systems, the analog-to-digital conversion is performed before the peak is reshaped.
In digital modulation, an analog carrier signal is modulated by a discrete signal. Digital modulation methods can be considered as digital-to-analog conversion and the corresponding demodulation or detection as analog-to-digital conversion. The changes in the carrier signal are chosen from a finite number of M alternative symbols (the modulation alphabet). Schematic of 4 baud, 8 bit/s data link containing arbitrarily chosen values.
In 2009, when the analog to digital conversion was completed, WOUB-TV and WOUC-TV used channels 27 and 35, respectively for digital television operations. Following the transition the stations remained on those channels, but, it uses PSIP to display 20 and 44 as the stations' respective virtual channels. In 2019, both stations moved to new physical channels as part of the FCC's spectrum re-pack process.
An ADC has several sources of errors. Quantization error and (assuming the ADC is intended to be linear) non-linearity are intrinsic to any analog-to-digital conversion. These errors are measured in a unit called the least significant bit (LSB). In the above example of an eight-bit ADC, an error of one LSB is 1/256 of the full signal range, or about 0.4%.
XEWT discontinued its analog signal on May 28, 2013. Tijuana was the first city in Mexico where the analog-to digital conversion took place. Immediately after the closure, worries about effects on the Baja California elections prompted the restoration of analog service until July 18, when XEWT and other Tijuana TV stations discontinued their analog signals again, this time for good. At this time, the callsign changed to XEWT-TDT.
Defects in the picture typically caused by insufficient sampling (violation of the Nyquist sampling rate) in the analog to digital conversion process or poor filtering of digital video. Defects are typically seen as jaggies on diagonal lines and twinkling or brightening in picture detail. Examples are: Temporal Aliasing — such as rotating wagon wheel spokes appearing to rotate in the reverse direction. Raster Scan Aliasing — such as sparkling or pulsing effects in sharp horizontal lines.
Adaptive predictive coding (APC) is a narrowband analog-to-digital conversion that uses a one-level or multilevel sampling system in which the value of the signal at each sampling instant is predicted according to a linear function of the past values of the quantized signals. APC is related to linear predictive coding (LPC) in that both use adaptive predictors. However, APC uses fewer prediction coefficients, thus requiring a higher sampling rate than LPC.
During late-Summer 2008, KGAN filed a lawsuit against the city of Cedar Rapids for failing to give the station full access to e-mail messages related to the Iowa Flood of 2008. The lawsuit has yet to be decided. On February 17, 2009, its digital signal remained on UHF channel 51 when the analog to digital conversion was completed. It has frequently preempted shows from CBS including CBS Kids in favor of movies, sports, and paid programs.
The lifecycle of sound from its source, through an ADC, digital processing, a DAC, and finally as sound again. A digital audio system starts with an ADC that converts an analog signal to a digital signal.Some audio signals such as those created by digital synthesis originate entirely in the digital domain, in which case analog to digital conversion does not take place. The ADC runs at a specified sampling rate and converts at a known bit resolution.
Computer and synthesizer technology joining together changed the way music is made, and is one of the fastest changing aspects of music technology today. Dr. Max Matthews, a telecommunications engineer at Bell Telephone Laboratories' Acoustic and Behavioural Research Department, is responsible for some of the first digital music technology in the 50s. Dr. Matthews also pioneered a cornerstone of music technology; analog to digital conversion. At Bell Laboratories, Matthews conducted research to improve the telecommunications quality for long-distance phone calls.
Digital audio uses pulse-code modulation (PCM) and digital signals for sound reproduction. This includes analog-to-digital conversion (ADC), digital-to-analog conversion (DAC), storage, and transmission. In effect, the system commonly referred to as digital is in fact a discrete-time, discrete-level analog of a previous electrical analog. While modern systems can be quite subtle in their methods, the primary usefulness of a digital system is the ability to store, retrieve and transmit signals without any loss of quality.
At the receiver side, the demodulator typically performs: # Bandpass filtering. # Automatic gain control, AGC (to compensate for attenuation, for example fading). # Frequency shifting of the RF signal to the equivalent baseband I and Q signals, or to an intermediate frequency (IF) signal, by multiplying the RF signal with a local oscillator sine wave and cosine wave frequency (see the superheterodyne receiver principle). # Sampling and analog-to-digital conversion (ADC) (sometimes before or instead of the above point, for example by means of undersampling).
FASCINATOR was adopted by the U.S government as Federal Standard 1023, which establishes interoperability requirements regarding the analog to digital conversion, encryption (with related synchronization), and modulation of encrypted voice associated with frequency modulation (FM) radio systems employing 25 kHz channels and operating above 30 MHz. Voice is digitized using 12 kbit/s continuously variable slope delta modulation (CVSD) and then encrypted using a National Security Agency (NSA) Commercial COMSEC Endorsement Program (CCEP) Type 1 encryption algorithm based on the KY-57/58.
Other vinyl record artifacts include turntable rumble, ticks, crackles and groove echos. In the Nyquist–Shannon sampling theorem, inadequate sampling bandwidth creates a sonic artifact known as an alias, and the resulting distortion of the sound is termed aliasing. Examples of aliasing can be heard in early music samplers since they could record audio at bit rates and sampling frequencies below the Nyquist rate, considered desirable by some musicians. Aliasing is a major concern in the analog-to- digital conversion of video and audio signals.
In June 2012, cost-cutting measures at KSAX resulted in the layoff of all but two employees and the ending of local cut-in broadcasts by any Alexandria television station. The Alexandria area is also served by Selective TV, Inc., a non-profit, viewer-supported organization which transmits several cable channels free-to-air over standard UHF television frequencies, viewable in any area home without subscription. Selective TV operates under low power television rules of the FCC and as such was not subject to the analog to digital conversion in 2009.
DCTs are widely used for encoding, decoding, video coding, audio coding, multiplexing, control signals, signaling, analog-to-digital conversion, formatting luminance and color differences, and color formats such as YUV444 and YUV411. DCTs are also used for encoding operations such as motion estimation, motion compensation, inter-frame prediction, quantization, perceptual weighting, entropy encoding, variable encoding, and motion vectors, and decoding operations such as the inverse operation between different color formats (YIQ, YUV and RGB) for display purposes. DCTs are also commonly used for high-definition television (HDTV) encoder/decoder chips.
Some specialized cards support digital video via digital video delivery standards including Serial Digital Interface (SDI) and, more recently, the emerging HDMI standard. These models often support both standard definition (SD) and high definition (HD) variants. While most PCI and PCI- Express capture devices are dedicated to that purpose, AGP capture devices are usually included with the graphics adapted on the board as an all-in-one package. Unlike video editing cards, these cards tend to not have dedicated hardware for processing video beyond the analog-to-digital conversion.
Since symbols (for example, alphanumeric characters) are not continuous, representing symbols digitally is rather simpler than conversion of continuous or analog information to digital. Instead of sampling and quantization as in analog-to-digital conversion, such techniques as polling and encoding are used. A symbol input device usually consists of a group of switches that are polled at regular intervals to see which switches are switched. Data will be lost if, within a single polling interval, two switches are pressed, or a switch is pressed, released, and pressed again.
For the latter, FEC is an integral part of the initial analog-to-digital conversion in the receiver. The Viterbi decoder implements a soft-decision algorithm to demodulate digital data from an analog signal corrupted by noise. Many FEC coders can also generate a bit-error rate (BER) signal which can be used as feedback to fine-tune the analog receiving electronics. The maximum proportion of errors or missing bits that can be corrected is determined by the design of the ECC, so different forward error correcting codes are suitable for different conditions.
A typical hardware setup using two shift registers to form an inter-chip circular buffer To begin communication, the bus master configures the clock, using a frequency supported by the slave device, typically up to a few MHz. The master then selects the slave device with a logic level 0 on the select line. If a waiting period is required, such as for an analog-to-digital conversion, the master must wait for at least that period of time before issuing clock cycles. During each SPI clock cycle, a full-duplex data transmission occurs.
Analog- to-DVR systems do not offer edge recording. This is because the analog cameras must first record to a central DVR; the video is then compressed into a digital format, and then stored typically on a hard drive inside the unit. All of this must be done before it can record to SD or attached hard drive. IP Camera systems on the other hand do not require analog to digital conversion so can record digital video directly to SD cards inside the camera, or to attached hard drive.
The sensors can alert physicians in the event of a blood sugar dip or spike. One of her undergraduate students proposed a way for the glucose sensor to operate on low-power, using an analog to digital conversion. In her position at the Heritage Medical Research Institute, Emami creates microdevices that can be used to monitor health and provide treatment inside patients' bodies. Emami has developed a biosensor that can continuously monitor vital information, including blood sugar, pH levels and cortisol, as well as acting as a therapeutic system, releasing insulin or other medicine.
This requires storing large signal charge at each pixel site and maintaining signal-to-noise ratio (or dynamic range) as the signal is read out and digitized. A ROIC has high-speed analog outputs to transmit pixel data outside of the integrated circuit. If digital outputs are implemented, the IC is referred to as a Digital Readout Integrated Circuit (DROIC). Digital readout integrated circuit (DROIC) block diagram A Digital readout integrated circuit (DROIC) is a class of ROIC that uses on-chip analog-to-digital conversion (ADC) to digitize the accumulated photocurrent in each pixel of the imaging array.
To make things more difficult, the PFM mode creates a wide spectrum of noise as well as SNJ in the time domain at the output voltage that is difficult to filter. The SNJ signature ,therefore, becomes a dominating influence on the performance of noise-sensitive SoCs, circuit components and fidelity of weak signals after the ripple voltage has been suppressed. In addition, SNJ has a cumulative effect in the analog to digital conversion found in modern digital communications due to the existence of a variety of unwanted noise signals over time which will be digitized and stored in memory.
Long-latency connections also benefit; in the case of a satellite orbiting around Uranus, retransmission due to errors can create a delay of five hours. ECC information is usually added to mass storage devices to enable recovery of corrupted data, is widely used in modems, and is used on systems where the primary memory is ECC memory. ECC processing in a receiver may be applied to a digital bitstream or in the demodulation of a digitally modulated carrier. For the latter, ECC is an integral part of the initial analog-to-digital conversion in the receiver.
With digital systems, the quality of reproduction depends on the analog-to-digital and digital-to-analog conversion steps, and does not depend on the quality of the recording medium, provided it is adequate to retain the digital values without error. Digital mediums capable of bit-perfect storage and retrieval have been commonplace for some time, since they were generally developed for software storage which has no tolerance for error. The process of analog-to-digital conversion will, according to theory, always introduce quantization distortion. This distortion can be rendered as uncorrelated quantization noise through the use of dither.
Speech and Audio Processing (Original MELP). That initial speech coder was standardized in 1997 and was known as MIL-STD-3005.Analog-to-Digital Conversion of Voice by 2,400 Bit/Second Mixed Excitation Linear Prediction (MELP), US DoD (MIL_STD-3005, Original MELP) It surpassed other candidate vocoders in the US DoD competition, including: (a) Frequency Selective Harmonic Coder (FSHC), (b) Advanced Multi-Band Excitation (AMBE), (c) Enhanced Multiband Excitation (EMBE), (d) Sinusoid Transform Coder (STC), and (e) Subband LPC Coder (SBC). Due to its lower complexity than Waveform Interpolative (WI) coder, the MELP vocoder won the DoD competition and was selected for MIL-STD-3005.
While at EPSCO, in 1953-54, Gordon created high-precision and high-speed signal processing, including the core technologies of analog-to-digital conversion. These developments were fundamental to the subsequent medical diagnostic tools, and have influenced therapeutic practice as well. Gordon publicized these developments in his paper, "A high-speed AD converter and its possible applications", delivered to the 1955 conference of the Instrument Society of America. Building on this work, Gordon and his engineering teams developed the first solid-state x-ray generator, the first quadrature-base band phased-array ultrasound system, and the first instant imaging computer-aided tomography system, among many other related inventions.
Secondly, due to inherent analog-to-digital conversion problems, the effect of aliasing is unavoidable, so that the audio output is "reflected" at equal amplitude in the frequency domain, on the other side of the Nyquist limit (half the sampling frequency), causing an unacceptably high level of ultrasonics to accompany the desired output. No workable scheme has been found to adequately deal with this. The term "digital" or "digital-ready" is often used for marketing purposes on speakers or headphones, but these systems are not digital in the sense described above. Rather, they are conventional speakers that can be used with digital sound sources (e.g.
A/D and D/A conversion A beta encoder is an analog-to-digital conversion (A/D) system in which a real number in the unit interval is represented by a finite representation of a sequence in base beta, with beta being a real number between 1 and 2. Beta encoders are an alternative to traditional approaches to pulse-code modulation. As a form of non-integer representation, beta encoding contrasts with traditional approaches to binary quantization, in which each value is mapped to the first N bits of its base-2 expansion. Rather than using base 2, beta encoders use base beta as a beta-expansion.
The earliest end-to-end analog telephone networks to be modified and upgraded to transmission networks with Digital Signal 1 (DS1/T1) carrier systems date back to the early 1960s. They were designed to support the basic 3 kHz voice channel by sampling the bandwidth-limited analog voice signal and encoding using pulse-code modulation (PCM). Early PCM codec-filters were implemented as passive resistorcapacitorinductor filter circuits, with analog- to-digital conversion (for digitizing voices) and digital-to-analog conversion (for reconstructing voices) handled by discrete devices. Early digital telephony was impractical due to the low performance and high costs of early PCM codec-filters.
In optics, high-pass and low-pass may have different meanings, depending on whether referring to frequency or wavelength of light, since these variables are inversely related. High-pass frequency filters would act as low-pass wavelength filters, and vice versa. For this reason it is a good practice to refer to wavelength filters as "Short-pass" and "Long-pass" to avoid confusion, which would correspond to "high-pass" and "low-pass" frequencies . Low-pass filters exist in many different forms, including electronic circuits such as a hiss filter used in audio, anti- aliasing filters for conditioning signals prior to analog-to-digital conversion, digital filters for smoothing sets of data, acoustic barriers, blurring of images, and so on.
Most commonly, these discrete values are represented as fixed-point words (either proportional to the waveform values or companded) or floating-point words. Discrete cosine waveform with frequency of 50 Hz and a sampling rate of 1000 samples/sec, easily satisfying the sampling theorem for reconstruction of the original cosine function from samples. (The effects of quantization are too subtle to be seen in this graph.) The process of analog-to-digital conversion produces a digital signal. The conversion process can be thought of as occurring in two steps: # sampling, which produces a continuous-valued discrete-time signal, and # quantization, which replaces each sample value by an approximation selected from a given discrete set (for example by truncating or rounding).
The passband modulation and corresponding demodulation (also known as detection) is carried out by modem equipment. According to the most common definition of digital signal, both baseband and passband signals representing bit-streams are considered as digital transmission, while an alternative definition only considers the baseband signal as digital, and passband transmission of digital data as a form of digital-to-analog conversion. Data transmitted may be digital messages originating from a data source, for example a computer or a keyboard. It may also be an analog signal such as a phone call or a video signal, digitized into a bit-stream for example using pulse-code modulation (PCM) or more advanced source coding (analog-to-digital conversion and data compression) schemes.
The discrete cosine transform (DCT) was first proposed by Nasir Ahmed in the early 1970s, and has since been widely implemented in DSP chips, with many companies developing DSP chips based on DCT technology. DCTs are widely used for encoding, decoding, video coding, audio coding, multiplexing, control signals, signaling, analog-to-digital conversion, formatting luminance and color differences, and color formats such as YUV444 and YUV411. DCTs are also used for encoding operations such as motion estimation, motion compensation, inter-frame prediction, quantization, perceptual weighting, entropy encoding, variable encoding, and motion vectors, and decoding operations such as the inverse operation between different color formats (YIQ, YUV and RGB) for display purposes. DCTs are also commonly used for high- definition television (HDTV) encoder/decoder chips.
PDTV encompasses a broad array of capture methods and sources, but generally it involves the capture of SD or non-HD digital television broadcasts without any analog-to-digital conversion, instead relying on directly ripping MPEG streams. PDTV sources can be captured by a variety of digital TV tuner cards from a digital feed such as ClearQAM unencrypted cable, Digital Terrestrial Television, Digital Video Broadcast or other satellite sources. Just as with Freeview (DVB-T) in the United Kingdom, broadcast television in the United States has no barriers to PDTV capture. Hardware such as the HDHomeRun when connected to an ATSC (Antenna) or unencrypted ClearQAM cable feed allows lossless digital capture of MPEG-2 streams (Pure Digital Television), without monthly fees or other restrictions normally implemented by a Set-top box.
Mean square quantization error (MSQE) is a figure of merit for the process of analog to digital conversion. In this conversion process, analog signals in a continuous range of values are converted to a discrete set of values by comparing them with a sequence of thresholds. The quantization error of a signal is the difference between the original continuous value and its discretization, and the mean square quantization error (given some probability distribution on the input values) is the expected value of the square of the quantization errors. Mathematically, suppose that the lower threshold for inputs that generate the quantized value q_i is t_{i-1}, that the upper threshold is t_i, that there are k levels of quantization, and that the probability density function for the input analog values is p(x).
A flow cytometer has five main components: a flow cell, a measuring system, a detector, an amplification system, and a computer for analysis of the signals. The flow cell has a liquid stream (sheath fluid), which carries and aligns the cells so that they pass single file through the light beam for sensing. The measuring system commonly uses measurement of impedance (or conductivity) and optical systems - lamps (mercury, xenon); high-power water-cooled lasers (argon, krypton, dye laser); low-power air-cooled lasers (argon (488 nm), red-HeNe (633 nm), green-HeNe, HeCd (UV)); diode lasers (blue, green, red, violet) resulting in light signals. The detector and analog-to-digital conversion (ADC) system converts analog measurements of forward-scattered light (FSC) and side-scattered light (SSC) as well as dye-specific fluorescence signals into digital signals that can be processed by a computer.
A drop-out compensator is an error concealment device that was commonly used in the analog video era to hide brief RF signal "drop-outs" on videotape playback caused by imperfections in or damage to the tape's magnetic coating. Most compensators worked by repeating earlier video scan-lines over short periods of signal loss; one early such system, "Mincom" was developed in the 1960s by the Minnesota Mining and Manufacturing Company, the company now known as 3M. Because of the high cost of the 3M device at the time, BBC R&D; engineers developed a simpler, less expensive unit based on a sample-and-hold technique for in-house use. Dedicated drop-out compensators were eventually superseded by the incorporation of drop-out compensation functionality into timebase correctors based on analog-to-digital conversion and digital line stores.
As soon as a phone line reached a local central office, a line card converted the analog signal from the subscriber to a digital one, and vice versa. While digitally encoded telephone lines notionally provide the same bandwidth as the analog systems they replaced, the digitization itself placed constraints on the types of waveforms that could be reliably encoded. The first problem was that the process of analog-to-digital conversion is intrinsically lossy, but second, and more importantly, the digital signals used by the telcos were not "linear" - they did not encode all frequencies the same way, instead utilizing a nonlinear encoding (μ-law and a-law) meant to favor the nonlinear response of the human ear to voice signals. This made it very difficult to find a 56kbit/s encoding that could survive the digitizing process.
The initial MELP was invented by Alan McCree around 1995 A Mixed Excitation LPC Vocoder Model for Low Bit Rate Speech Coding, Alan V. McCree, Thomas P. Barnweell, 1995 in IEEE Trans. Speech and Audio Processing (Original MELP) while a graduate student at the Center for Signal and Image Processing (CSIP) at Georgia Tech, and the original MELP related patents have expired by now. That initial speech coder was standardized in 1997 and was known as MIL-STD-3005.Analog-to-Digital Conversion of Voice by 2,400 Bit/Second Mixed Excitation Linear Prediction (MELP), US DoD (MIL_STD-3005, Original MELP) It surpassed other candidate vocoders in the US DoD competition, including: (a) Frequency Selective Harmonic Coder (FSHC), (b) Advanced Multi-Band Excitation (AMBE), (c) Enhanced Multiband Excitation (EMBE), (d) Sinusoid Transform Coder (STC), and (e) Subband LPC Coder (SBC).
Microcontrollers must provide real-time (predictable, though not necessarily fast) response to events in the embedded system they are controlling. When certain events occur, an interrupt system can signal the processor to suspend processing the current instruction sequence and to begin an interrupt service routine (ISR, or "interrupt handler") which will perform any processing required based on the source of the interrupt, before returning to the original instruction sequence. Possible interrupt sources are device dependent, and often include events such as an internal timer overflow, completing an analog to digital conversion, a logic level change on an input such as from a button being pressed, and data received on a communication link. Where power consumption is important as in battery devices, interrupts may also wake a microcontroller from a low-power sleep state where the processor is halted until required to do something by a peripheral event.
In 1983 Neumann began to introduce microphones with balanced outputs but no output transformer, starting with the model TLM 170. Eventually this "fet 100" or "transformerless" series was expanded to include the KM 100 modular series of small microphones (with seven different "active capsules" for various directional patterns), the cardioid TLM 193 (using the capsule of the U 89 and TLM 170), the small-diaphragm KM 180 series, the large-diaphragm cardioid TLM 103, the variable-pattern TLM 127 and the TLM 49 cardioid vocal microphone. Beginning in 1995 the company introduced a series of vacuum tube microphones with transformerless output circuitry: the multi-pattern M 149 Tube, the cardioid M 147 Tube, and the omnidirectional M 150 Tube (based on the classic M 50 design, with the pressure transducer mounted in the surface of a sphere inside the capsule head). In 2003 Neumann introduced their first microphone with built-in analog- to-digital conversion, the Solution-D D-01.
These include interferometric distance measurement, holography, coherent communications, and coherent control of chemical reactions. Laser diodes are used for their "narrow spectral" properties in the areas of range-finding, telecommunications, infra-red countermeasures, spectroscopic sensing, generation of radio-frequency or terahertz waves, atomic clock state preparation, quantum key cryptography, frequency doubling and conversion, water purification (in the UV), and photodynamic therapy (where a particular wavelength of light would cause a substance such as porphyrin to become chemically active as an anti-cancer agent only where the tissue is illuminated by light). Laser diodes are used for their ability to generate ultra-short pulses of light by the technique known as "mode-locking." Areas of use include clock distribution for high-performance integrated circuits, high-peak-power sources for laser-induced breakdown spectroscopy sensing, arbitrary waveform generation for radio-frequency waves, photonic sampling for analog-to-digital conversion, and optical code-division-multiple-access systems for secure communication.
Since then, the Hopfield network has been widely used for optimization. The idea of using the Hopfield network in optimization problems is straightforward: If a constrained/unconstrained cost function can be written in the form of the Hopfield energy function E, then there exists a Hopfield network whose equilibrium points represent solutions to the constrained/unconstrained optimization problem. Minimizing the Hopfield energy function both minimizes the objective function and satisfies the constraints also as the constraints are “embedded” into the synaptic weights of the network. Although including the optimization constraints into the synaptic weights in the best possible way is a challenging task, indeed many various difficult optimization problems with constraints in different disciplines have been converted to the Hopfield energy function: Associative memory systems, Analog-to-Digital conversion, job-shop scheduling problem, quadratic assignment and other related NP-complete problems, channel allocation problem in wireless networks, mobile ad-hoc network routing problem, image restoration, system identification, combinatorial optimization, etc, just to name a few.
A means of converting digital audio into video format was necessary. Such an audio recording system includes two devices: the PCM adaptor, which converts audio into pseudo-video, and the videocassette recorder. A PCM adaptor performs an analog-to-digital conversion producing series of binary digits, which, in turn, is coded and modulated into a black and white video signal, appearing as a vibrating checkerboard pattern, which can then be recorded as a video signal. Most video-based PCM adaptors record audio at 14 bits per sample, and a sampling frequency of 44.056 kHz for EIAN countries (or 44.1 kHz for CCIR countries.) However, some of the earlier models, such as the Sony PCM-100, recorded 16-bits per sample as well, but used only 14 of the bits for the audio, with the remaining 2 bits used for error correction for the case of dropouts or other anomalies being present on the videotape.
Mill Valley Air Force Station' received an AN/FPS-8 in 1955 (subsequently converted to an AN/GPS-3), and during 1956 an AN/FPS-4 height-finder radar operated (superseded by an AN/FPS-6 in 1958.) Mill Valley began operating an AN/FPS-7 search radar in 1960 at facility built in 1959 by the General Electric company. During SAGE deployment, a Burroughs AN/FST-2 Coordinate Data Transmitting Set (CDTS) was installed at Mill Valley AFS and "in late 1960" began providing digitize radar tracks for telecommunication via microwave to the Air Defense Direction Center (DC-18) at Beale Air Force Base (the squadron was re-designated 666th Radar Squadron (SAGE) on 15 January 1961.) By 1961 the 666th added AN/FPS-6 and AN/FPS-6B height-finder radars, and a detachment of the 666th began operating radars at the Mather AFB P-58 radar station which, as with the Fort Ord P-38A gap filler annex (AN/FPS-14 at ), provided radar video to the Mill Valley CDTS for analog-to-digital conversion.

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