Matches 151 - 200 out of 213 < 1 2 3 4 5 >
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4633196 Delta modulator/demodulator with improved tracking of rapidly varying waveforms  
In a delta modulator/demodulator incorporating continuously variable slope circuitry (8, 9, 10), the current passed to an integrator (3) to increase its gain, is squared by a squaring circuit (13)...
4633425 Switched capacitor filter utilizing a differential input and output circuit  
An integrated circuit for filtering signals by having cascaded switched capacitor sampling filters. The circuit includes a transmit section which has an anti-aliasing filter, a core section filter,...
4630114 Method for determining the displacement of moving objects in image sequences and arrangement as well as uses for implementing the method  
In a method and apparatus for determining, in a system having a transmitting end and a receiving end, displacements of image features occurring between successively transmitted image sequences, by...
4616349 Analog-to-digital converter for seismic exploration using delta modulation  
An analog-to-digital converter for use in seismic data processing applications is disclosed which features variants on delta modulation and delta-sigma modulation methods. A series of single bits...
4609941 Television signal standards conversion  
A television picture transmission system using conditional replenishment employs a scanning rate at the transmitter which differs (for asynchronous operation, slightly; or for operation between...
4584558 Analog/digital converter  
An analog/digital converter wherein an analog input signal is applied to a variable gain input amplifier which has an output connected to a subtractor. Also connected to the subtractor is the...
4574383 Decoder of adaptive differential pulse code modulation  
A transcoder which transcodes adaptive differential pulse code modulation (ADPCM) signals to pulse code modulation (PCM) signals without cumulative transcoding noises even if mutual transcoding...
4571736 Digital communication system employing differential coding and sample robbing  
Speech bit rate reduction by robbing, e.g. periodically not transmitting, a percentage of speech data samples in a communication system employing differential pulse code modulation (DPCM) or...
4562425 Differential encoder and decoder for transmitting binary data  
To enable binary data to be differentially encoded into symbols (waves) for transmission the data is applied in n-bit data-words to produce symbols which, when displayed in a phasor-diagram, are in...
4553237 Error-correction system for two-dimensional multilevel signals  
Disclosed is an error correction system in which part of the data bits of first multilevel input data is differentially encoded to form second data comprising the differentially encoded data bits...
4549305 Adaptive differential PCM decoder  
The present invention features an ADPCM decoder of the instantaneous companding type which comprises two memory circuits (each preferably PROM). The first memory contains a plurality of...
4544919 Method and means of determining coefficients for linear predictive coding  
An improved method and means of determining reflection coefficients that characterize an electrical signal that obtains characteristics of an all-zero inverse lattice filter. The reflection...
4531151 System for the redundancy-reducing digital transmission of television video signals  
When television signals are transmitted digitally over PCM networks, it is sometimes necessary to reduce the bit rate of video signals, such as chrominance signals, on the transmission path from...
4530094 Coding for odd error multiplication in digital systems with differential coding  
Differential encoding is commonly used in data transmission systems because it allows correct recovery of the data even though the polarity may have changed during transmission. However, single...
4528551 Digital to analog converter employing sigma-delta modulation for use in telephone systems  
A digital to analog converter is employed in the digital line circuit of a telephone system and operates to convert a digital signal indicative of an analog speech signal back into a replica of the...
4507791 Analog and digital signal apparatus  
Apparatus for reducing unmasked quantizing noise modulation in adapting differential digital coding systems. In the digital encoder low frequency signals are boosted in the presence of dominating...
4496937 Sampled signal generation circuit  
A sampled data generation circuit includes a voltage controlled oscillator for producing an output signal with a frequency variable according to a control voltage, a sample and hold circuit for...
4483012 Differentially convolutional channel coding with expanded set of signalling alphabets  
A technique for converting a sequence of binary digits into a sequence of signalling alphabets of a modulated carrier signal for data transmission. By introducing additional redundant signalling...
4475227 Adaptive prediction  
An improved Adaptive Predictor Circuit for use in an Adaptive Differential PCM Coding system (ADPCM) uses tap coefficient values to determine adaptation rate. The stability margin of a fourth order...
4389726 Adaptive predicting circuit using a lattice filter and a corresponding differential PCM coding or decoding apparatus  
An adaptive predicting circuit comprises a lattice filter with N identical cells each having four accesses. The first and second accesses of a cell are respectively connected to the third and...
4368487 Method and apparatus for mitigation of degradations caused by spatio-temporal filtering of video signals  
Method and apparatus are provided for mitigating the effects of temporal filtering in a transmitted DPCM encoded video signal wherein the signal is conditioned in the receiver by the inverse...
4363103 Device for following and estimating the local state of picture contours  
A device for following and recursively estimating the local state of pict contours defined by lines of N points distributed in accordance with an orthogonal sampling structure, said points being...
4307420 Motion-compensated interframe coding system  
An interframe coding system provided for highly efficient transmission of coded television picture signal is improved by compensating prediction error of predicted picture motion in response to...
4271431 Scan converter utilizing discrete differentially coded signals  
A scan rate converter utilizing a discrete differential coding system as disclosed. The scan rate converter converts input FSTV and SSTV video information into discrete differential coded signals...
4251804 Delta modulation utilizing selectable piecewise linear waveform approximation  
An analog-to-digital and digital-to-analog conversion system utilizes a modified delta modulation technique, together with generation of a number of linear waveforms forming a piecewise linear...
4231022 Interpolative PCM decoder utilized for μ-law and A-law  
An interpolative PCM decoder converts PCM signals having polarity bits, segment selection bits and uniform quantization bits into an analog signal. The PCM decoder may be used both for μ-law and...
4193031 Method of signal transmission and reception utilizing wideband signals  
A method is disclosed for signal transmission and reception utilizing wideband signals, and, more particularly, the use of time-frequency coded signals to achieve more efficient use of the...
4189713 Remote control systems  
An acoustic remote control link transmits different value bits as pulses containing different numbers of carrier cycles and identifies those bits on reception on the basis of the received pulses...
4141034 Digital encoding of color video signals  
For a given transmission bit rate, the efficiency of encoding the color components of a color video signal is increased by utilizing information obtained from the luminance component to optimize...
4130729 Compressed speech system  
A compressed speech system comprising a residual encoder for transmitting or storing a digitized speech signal having one bit of resolution. An original speech waveform may be reconstituted from...
4122442 Integrable bidirectional shift register in analog-to-digital converter  
A multistage bidirectional shift register for a differential pulse code system, simple enough to be integrated inexpensively, is achieved by taking advantage of the code configuration conditions...
4107669 Apparatus for analog to digital conversion  
An input analog signal is converted to a digital output signal by an oversampled predictive DPCM coder which includes an n stage delay line in the feedback loop. The n delay line outputs are...
4087754 Digital-to-analog converter for a communication system  
In an encoder portion, a communication system converts analog signals, into linear delta modulated (hereafter LDM) signals and LDM signals into compressed pulse code modulated (hereafter CPCM)...
4049910 Digital signal transmission system  
A transmission system of the kind comprising, on emission, a code converter for coding said signals into variable length words according to their occurrence probabilities, the word rate being...
4027152 Apparatus and method for transmitting binary-coded information  
An apparatus is disclosed for transmitting binary-coded information over a fiber-optic link which provides a link monitor to indicate whether the fiber-optic link is intact and operating. The...
4007421 Circuit for encoding an asynchronous binary signal into a synchronous coded signal  
Successive intervals of an asynchronous binary signal are examined for the occurrence of transitions and each transition is encoded into a 2-bit binary code word. The occurrence of two transitions...
3990009 Method and apparatus for uniquely encoding channels in a digital transmission system  
In a digital transmission system of the type which employs cross-polarized radio channels, the failure of a transmitter associated with a particular channel can cause an undesired signal cross-over...
3937871 Code communication  
A method and apparatus for code communication is disclosed in order to achieve band-width compression. Successive portions of information are derived and the next portion of information is...
3931596 Adaptive quantizer apparatus using training mode  
Ideally, when a signal is quantized, the range of the quantizer should be matched to the power of the signal. Disclosed herein is adaptive quantizer apparatus which utilizes a particular quantizing...
3927372 Arrangement for improving the reproduction of amplitude jumps during transmission using differential pulse code modulation  
An arrangement incorporated in a DPCM code communication system to be able to reproduce steep amplitude jumps (edge between black and white) correctly. At the receiver the maximum difference value...
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...
3831167 DIGITAL-TO-ANALOG CONVERSION USING MULTIPLE DECODERS  
A technique and apparatus are described for converting a digital signal to analog form wherein pulse code modulated signals are first converted to a differential pulse code modulated format. The...
3829779 MULTILEVEL CODE TRANSMISSION SYSTEM  
A multilevel code transmission system is made capable of transmission and reception of correct signals even if the demodulation carrier is 180 degrees out of phase by dividing the levels of a...
3772458 METHOD FOR REDUCING THE BANDWIDTH OF COMMUNICATION SIGNALS  
Method of reducing the bandwidth of communication signals to suppress data signals considered insignificant as being only slightly different from preceding signals, and transmitting a constant...
3772682 DIGITAL CONVERSION FROM ONE PCM FORMAT TO ANOTHER  
Conversion between adaptive differential PCM normally is accomplished by decoding, requantizing, and recoding. Complex operations are required and noise and other distortions are inevitably...
3740654 SIGNAL CONDITIONING CIRCUIT  
A pulse conditioning circuit having a two-stage feedback amplifier with a bipolar switch between the stages. A logic circuit samples the signal at the summing junction of the feedback amplifier and...
3723879 DIGITAL DIFFERENTIAL PULSE CODE MODEM  
A differential pulse code modem receives digitally quantized samples of an input analog signal and produces digital words or codes representing difference levels. Each output word represents the...
3666890 DIFFERENTIAL CODING SYSTEM AND METHOD  
A differential coding system and method for use in a data communications system employing phase ambiguous coherent detection. The system and method includes differentially encoding a plurality of...
3651515 CAPACITIVE SWITCHED GAIN RATIO OPERATIONAL AMPLIFIER PCM DECODER  
A self-companding pulse code modulation converter employs switched gain ratio of an operational amplifier. Capacitors, weighted to correspond to the quantizing characteristic, are switched between...
3631520 PREDICTIVE CODING OF SPEECH SIGNALS  
Predictive coding of signals, i.e., the reduction or redundancy in a signal by subtracting from it that part which can be predicted from its past, is a well-known technique for reducing the channel...
Matches 151 - 200 out of 213 < 1 2 3 4 5 >