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7280593 |
Method and system for sample and reconstruction synchronization for digital transmission of analog modem signal
A method and system for the synchronization of the transmission of digitally converted analog modem signals between two or more modems using either RF over-the-air or A/C power line communication...
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7130337 |
Method and system for sample and recreation synchronization for digital transmission of analog modem signal
A method and system for the synchronization of the transmission of digitally converted analog modem signals between two or more modems using either RF over-the-air or A/C power line communication...
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7054372 |
Digital transmission line tap circuit
A digital transmission line tap circuit is provided for applying a non-intrusive tap on a digital transmission line thus allowing the transmission signal to be monitored or utilized by another...
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6400288 |
Method and apparatus for generating code words with shifted tribit error protection
An encoder is provided that converts data words into code words. The code words, when concatenated together, are such that sub-strings of consecutive first symbols in the code words have no more...
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6370397 |
Search window delay tracking in code division multiple access communication systems
The present invention provides a search window delay tracking procedure for use in a multipath search processor of a CDMA radio receiver. A channel impulse responses is estimated for a received...
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6363343 |
Automatic gain control
A gain control circuit for a telephone, the circuit comprising a signal strength calculator for calculating the strength of a signal; a gain controller adapted to modify the strength of the signal...
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4646322 |
Adaptive delta modulation codec
An ADM codec includes CVSD encoder and decoder circuitry having a syllabic filter responsive to the binary state of the ADM bit samples for changing the quantization step amplitude at a rate of...
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4588981 |
Double integration, delta-sigma, analog-digital coder
The invention relates to a double integration or dual slope delta-sigma coder. This coder comprises a first adder receiving on an input (36) a signal E(p) to be encoded and on an input (37) the...
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4541103 |
Digitally controlled syllabic filter for a delta modulator
A unique CVSD CODEC is provided utilizing switched capacitor technology. This CVSD CODEC includes a syllabic filter which provides one of a large number of possible step sizes, thereby allowing the...
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4446565 |
CVSD Transmission with improved intelligibility of voice signals
Voice signals subjected to differential modulation such as CVSD modulation are made more intelligible by differentiating an electrical analog of the voice signal, clipping peaks of the...
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4438523 |
Differential digital modulation and demodulation system with an analog signal-dependent sampling clock
A differential digital modulation and demodulation system with an analog signal-dependent sampling clock has a sampling clock-controlled first digital modulator and a predictably functioning second...
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4406010 |
Receiver for CVSD modulation with integral filtering
CVSD modulation is detected by applying a digital signal containing CVSD information to a digital filter that is in the CVSD loop that includes a syllabic filter and a rule circuit. The digital...
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4361893 |
Transmission system using differential pulse code modulation
This system comprises an encoder in which the differential PCM signal to be transmitted is formed as the difference between the incoming linear PCM signal and a prediction signal produced by a...
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4352191 |
Hybrid companding delta modulation system
A hybrid companding delta modulation system is an improvement of adaptive delta modulation and is particularly suitable for coding a speech signal. It employs both syllabic and instantaneous...
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4264974 |
Optimized digital delta modulation compander having truncation effect error recovery
A digital delta modulation compander circuit makes advantageous use of the mathematical truncation created during the computation of step sizes to create a non-linear step size variation which...
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4035724 |
Digital converter from continuous variable slope delta modulation to pulse code modulation
The invention relates to a digital converter and to a method for digitally converting a coded signal being at a delta rate into another coded signal flowing at a PCM rate. First, the code of the...
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3979676 |
Delta modulation apparatus
Disclosed is a digital modem using continuously variable sloped delta modulation and adapted for digitizing voice signals in a telephone system. In the analog to digital direction (A/D), an analog...
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3913016 |
Circuit for curtailing effects of bit errors in pulse coded transmission
A differentially pulse coded digital representation of a continuous analog signal is digitally accumulated, and each time polarity information indicates that the accumulated digital approximation...
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3899754 |
Delta modulation and demodulation with syllabic companding
A delta modulator and demodulator are shown using double integration in the audio feedback loop and including a separate feedback loop for direct current offset compensation. The output bit pattern...
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3882458 |
Voice operated switch including apparatus for establishing a variable threshold noise level
A digital voice-operated switch including a sampling circuit for establishing a threshold noise level as a function of background plus electrical noise in a communications system. The switch...
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3878465 |
Instantaneous adaptative delta modulation system
An instantaneous adaptive delta modulation system including a modulator and a demodulator. The modulator comprises a comparator having a first input connected to receive an analog signal, a second...
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3857111 |
SYLLABIC ADAPTATIVE DELTA MODULATION SYSTEM
A syllabic adaptive delta modulation system including a modulator and a demodulator. The modulator comprises a comparator having a first input connected to receive an input analog signal, a second...
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3835385 |
DIGITAL DELTA ENCODER AND DECODER
Amplitude varying signal is time sampled at constant clock rate (e.g. 40 kHz for voice) and sample is compared (in encoder) with analogue conversion of digitally stored previous value. If signal...
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3823376 |
TRANSMITTER FOR THE TRANSMISSION OF ANALOGUE SIGNALS BY PULSE CODE
Pulse code modulation transmitter including an instantaneous dynamic control device having a segment-shaped control characteristic, in which the successive amplitude values are converted into...
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3815033 |
DISCRETE ADAPTIVE DELTA MODULATION SYSTEM
In a discrete adaptive delta modulation system, the modulator located at the transmitter converts an analog signal into a digital signal at the rate f s while the demodulator located at the...
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3794919 |
OUTSIDE LOOP ADAPTATIVE DELTA MODULATION SYSTEM
An outside loop adaptive delta modulation system. The transmission side of the system includes an envelope detector for detecting the envelope of an analog input signal and a divider for dividing...
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3784922 |
ADAPTIVE DELTA MODULATION DECODER
In an adaptive delta modulation system, step sizes are instantaneously companded by digital logic which controls the charging or discharging time interval of an integrating capacitor. A high speed...
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3757252 |
DIGITAL COMPANDED DELTA MODULATOR
A digital companded delta modulator comprising a comparator having a first input connected to receive an input analog signal, a second input obtained from an integrator located in the conventional...
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3727135 |
ADAPTIVE CODE MODULATION IMPROVEMENT IN DIGITAL CODE MODULATORS
Digital code modulators are improved by addition of feedback means for adive code modulation to continuously match the dynamic range of the digital decoder to the dynamic range of the input signal....
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3703688 |
DIGITAL ADAPTIVE-TO-LINEAR DELTA MODULATED SIGNAL CONVERTER
A digital adaptive delta modulated (ADM) to linear delta modulated (LDM) signal converter is disclosed which operates at a predetermined multiple, m, of the applied adaptive modulated signal bit...
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3699566 |
DELTA CODER
An analog to digital converter in which the instantaneous difference between each successive analog signal sample magnitude and a corresponding reference magnitude is digitally encoded. A feedback...
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3643180 |
DELTA MODULATOR APPARATUS
Improved delta modulator apparatus comprising a differential input circuit, a decision circuit timed by a sampling pulse generator and a decoder circuit is provided according to the present...
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3628148 |
ADAPTIVE DELTA MODULATION SYSTEM
An adaptive delta modulation system is characterized by an encoder algorithm having a plurality of unique states. A combinational circuit receives a feedback signal from the transmitted signal and...
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3621396 |
DELTA MODULATION INFORMATION TRANSMISSION SYSTEM
A delta-modulation system is disclosed in which an analog value, which each digit in a delta-modulated output signal represents, is varied in response to predetermined patterns of the...
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3609551 |
DISCRETE-CONTINUOUS COMPANDING FOR A DIGITAL TRANSMISSION SYSTEM
A delta modulation transmission system is disclosed in which the message signal is, effectively, compressed at the transmitter and, effectively, complementarily expanded at the receiver. The...
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3573364 |
BAND-COMPRESSED SIGNAL TRANSMISSION SYSTEM
A band-compressed delta modulated signal communication system for transmitting an information signal admitting of abrupt variations in amplitude is disclosed in accordance with the teachings of the...
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3568061 |
BILATERAL DIGITAL TRANSMISSION SYSTEM WITH COMPANDING HAVING SAME STEP SIZE IN EACH DIRECTION
A digital transmission system is disclosed utilizing forward and backward acting companding for transmission from and to a central terminal to and from a plurality of remote terminals,...
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3500441 |
DELTA MODULATION WITH DISCRETE COMPANDING
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3497624 |
CONTINUOUSLY COMPOUNDED DELTA MODULATION
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3496468 |
DELTA-MODULATION COMMUNICATION SYSTEM WITH HYPERBOLIC COMPANDING CHARACTERISTICS
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3461244 |
DELTA MODULATION SYSTEM WITH CONTINUOUSLY VARIABLE COMPANDER
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3414818 |
COMPANDING PULSE CODE MODULATION SYSTEM
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3249870 |
Delta modulation signal transmission system
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3564415 |
Title is not available
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3716803 |
Title is not available
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