Matches 101 - 150 out of 213 < 1 2 3 4 5 >
Match Document Document Title
5117234 Signal modulation system  
A signal modulation system for converting a plural-bit digital input signal to an encoded-bit digital output signal representative of an analog signal having a variable amplitude by employing...
5101205 A/D converter including error correction for a local D/A converter  
An A/D converter includes a subtracter for calculating a difference between an input signal and a feed-back signal, and outputting a differential signal, a local A/D converter for converting the...
5093843 Digital communicationn system using partial response and bipolar coding techniques  
A digital communication system comprises a transmitter including a (1,0) precoder for precoding a unipolar input digital data stream and a bipolar converter for converting the output signal of the...
5093845 Signal generator for generating pulse signals having particular waveforms for data transmission and method of operation  
A signal generator for generating pulse signals having a waveform required by the Recommendation of International Telegraph and Telephone Consultative Committee (CCITT) is disclosed. The signal...
5063574 Multi-frequency differentially encoded digital communication for high data rate transmission through unequalized channels  
A differentially encoded digital signal waveform is generated as a discrete time representation of a desired analog signal utilizing multi-frequency modulation techniques. The computational...
5054036 Digital signal coding  
A trellis coder has a convolutional encoder which has n states and can progress from a current state to a follower state depending on an input. The state progressions are selected such that they...
5023889 Trellis coded multilevel DPSK system with doppler correction for mobile satellite channels  
A trellis coded multilevel differential phase shift keyed mobile communication system. The system of the present invention includes a trellis encoder for translating input signals into trellis...
4955037 Apparatus and methods for recovering alignment from a non-ideally encoded multi-bit digital signal  
Apparatus and methods are disclosed for recovering alignment from a non-ideally encoded multi-bit digital signal without the need to embed framing information within the encoded signal or append...
4933957 Low bit rate voice coding method and system  
This low bit rate voice encoding involves short-term predictive filtering the voice signal s(n) using partial correlation related coefficients derived from pre-emphasized s(n), and deriving a short...
4933762 Method and coding and decoding devices for picture transmission through a variable rate network  
The coding and decoding devices embodying the invention are connected by two paths, a main path and an auxiliary path, of a variable rate digital transmission network. When the main path is capable...
4916446 Remote control device  
A remote control device capable of substantially eliminating affection of noise and radio interference and increasing a transmission rate to improve a response speed by alternately transmitting an...
4910685 Video circuit including a digital-to-analog converter in the monitor which converts the digital data to analog currents before conversion to analog voltages  
A system for processing video data to be displayed comprises a controller and a monitor. The controller includes a memory for storing the digital data to be displayed and apparatus for sequentially...
4907248 Error correction for digital signal transmission  
The system provides correction for error signals caused by noise in the transmission channel in digital signals or analog signals which have been digitized. The first or second differential of the...
4897856 Offset correction circuit for a sigma-delta coding device  
An offset correction circuit is disclosed in a digital-to-analog coder (10) comprising a delta coder (18) providing a serial bit string at a high frequency F in response to digital words supplied...
4890283 High definition television augmentation channel  
High transmission and reception quality is achieved in a high definition television system, with minimum intra-channel interference, by digitally encoding the enhancement information and employing...
4888640 Refresh system for digital signals  
In a DPCM video digital data communication system each scan line of a video frame is refreshed with PCM data over a refresh cycle comprising a plurality of frames. Refresh generators at the...
4866518 Arrangement for DPCM coding of television signals with fast signal processing  
In DPCM coders, respective estimated values are subtracted from digitized picture element signals and the estimated errors are employed for signal transmission following quantization and coding....
4866510 Digital video encoder  
A differential pulse code arrangement reduces the bit rate of a composite color video signal by sampling the video signal at a predetermined rate of m times the color sub-carrier frequency,...
4864397 Arrangement for past DPCM coding of video signals according to a 2-D or 3-D coding method  
In a DPCM coder respective estimated values are subtracted from digitized picture element signals and estimated errors are used for signal transmission after quantization and coding. Each estimated...
4860310 Duobinary encoded signal decoder  
A device for decoding a transmitted sequence of duobinary encoded signals, which provides as an output a sequence of binary signals which most probably matches the transmitted sequence of duobinary...
4852129 Data compression system using frequency band translation and intermediate sample extrapolation  
A digital data transmission system for transmitting selected periodic ones of real data samples and intermediate extrapolated data samples. The transmitting end of the communication system includes...
4843465 Picture transmission system using secondary differential variable sampling rate coding  
A picture transmission system of the present invention is adapted to code picture data by a variable sampling rate coding system to transmit the same. Picture data are stored in a frame memory (16)...
4831439 Refresh system for digital signals with refresh cycle synchronization  
In a DPCM video digital data communication system, each scan line of a video frame is refreshed with PCM data over a refresh cycle comprising a plurality of frames. Refresh generators at the...
4827340 Video-signal DPCM coder with adaptive prediction  
For a video-signal-coding facility using adaptive DPCM in which switching is effected block by block between different predictors, a basic circuit arrangement is given for the case where switching...
4792787 Wide dynamic range analog-to-digital converter using linear prediction  
Improved dynamic range resolution or accuracy analog to digital conversion ses linear prediction. An open loop or feed-forward architecture passes an analog signal to a coarse or orthodox...
4783792 Apparatus for transmitting digital signal  
The invention is concerned with an apparatus in which one of a large number of previously provided prediction filters (4) is selected and digital signal is transmitted through the selected...
4775986 DPCM decoding circuit for digital samples  
A decoding circuit for digital samples defining N points of an initial digital signal coded into p bits transmitted by a transmitter by means of differential pulse code modulation (DPCM) into r...
4774496 Digital encoder and decoder synchronization in the presence of data dropouts  
Recovery from transmission errors is facilitated by initializing state variables to prescribed values in both a digital encoder used in transmitting a signal and a corresponding digital decoder...
4759038 PCM transmission system  
A PCM difference data is obtained from an original data, and an absolute data having a lower bit number than the original data is obtained at every data block, each data block comprising a...
4751736 Variable bit rate speech codec with backward-type prediction and quantization  
In an adaptive differential PCM (ADPCM) system transmitter, three quantizers provide, respectively, 3, 4, and 5-bit quantization at the signal sampling rate. Each quantizer produces, in response to...
4750190 Apparatus for using a Leroux-Gueguen algorithm for coding a signal by linear prediction  
The invention relates to an apparatus for using the Leroux-Gueguen algorithm for coding a signal by linear prediction. Apparatus applicable to the coding of a signal uses the Leroux-Gueguen...
4748620 Time stamp and packet virtual sequence numbering for reconstructing information signals from packets  
Unwanted distortion in signals being reconstructed from packets is substantially eliminated by employing a virtual sequence packet numbering scheme in conjunction with a time stamp value. A virtual...
4748503 Data reduction circuit with a differential pulse code modulator for video signals  
A data reduction circuit employs a differential pulse code modulator for input video signals where the time-critical loop includes a loop subtractor (s2), a quantizer (q), and a loop delay element...
4745474 Two resolution level DPCM system  
A digital television transmitter has a buffer that receives a low resolution low pass filtered signal. A high resolution high pass filtered signal is applied to the buffer only when the buffer can...
4743967 Differential coding apparatus having an optimum predicted value determining circuit  
A differential coding apparatus having a plurality of predictive function computing circuits and an optimum predicted value determining circuit. The optimum predicted value determining circuit...
4725885 Adaptive graylevel image compression system  
Apparatus and method for modelling differential pulse code modulation (DPCM) input data for entropy coding. In particular, the sign and magnitude of one piece of DPCM data after another are...
4716453 Digital video transmission system  
In a high-quality component video digital transmission system (FIGS. 1 and 2), transmitter DPCM encoders (110-112) and corresponding receiver DPCM decoders (210-212) include respective adaptive...
4713817 Multidimensional, convolutionally coded communication systems  
A family of multi-dimensional convolutionally coded modulation systems achieves enlarged minimum distance between possible sequences of signal points, reduced number of error events with the...
4709375 Digital phase selection system for signal multipliers  
Phase adjustment techniques are disclosed for use with signal multipliers and the like. A system and method is disclosed for producing selected phase relationship product values in signals which...
4706261 Differential phase modulation  
The amplitude of a signal to be modulated on a carrier wave is sampled every T seconds. The sampled amplitudes are converted into phase representative pulses of pulse rate 1/T. Each phase...
4704628 Combined intraframe and interframe transform coding system  
An apparatus and method for signal processing employing intraframe and interframe variable prediction transform coding. Images are represented by sequential frames of two-dimensional arrays of...
4703480 Digital audio transmission  
A digital sub-band coder for audio signals provides for adaptive allocation of bits to (e.g.) two sub-bands. Estimation of the relative energy content of the bands is determined by reference only...
4700226 Rate buffer control of predicted signal decimation and interpolation for adaptive differential pulse code modulator  
A predictive coding signal communication arrangement includes, at the transmitter, a subtractor for subtracting delayed predicted signals from current input signals to produce difference signals....
4700361 Spectral emphasis and de-emphasis  
The complementary pre-processing and post-processing circuits of this inventiona re advantageous for reducing noise introduced into a signal by a process or medium where the noise introduced rises...
4685115 Apparatus for transmitting digital signals  
The apparatus uses at least data in the straight PCM mode and data in the differential PCM mode of second or higher orders as data based upon a sampling value of input signals, and detects and...
4661945 Differential coding system and apparatus therefor  
A differential coding system applicable to a staggered quadrature amplitude modulation transmission system is disclosed. Even when ambiguities with respect to phase and time have developed in...
4658239 Differential pulse code modulation coder  
A differential pulse code modulation coder has a pair of series connected arithmetic units connected to the input of a quantizer, with the output of the quantizer connected through a first...
4651131 Apparatus for converting an analogue input signal of narrow bandwidth to digital form  
A narrow band signal is converted into digital form using an analogue to digital converter of relatively small capacity. The input signal is compared with a prediction of it based on previous...
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...
4633483 Near-instantaneous companding PCM involving accumulation of less significant bits removed from original data  
A data transmission system combines a near-instantaneous companding system with PCM or DPCM transmission data. In the transmitting side, lower bits are removed from an original data, to form...
Matches 101 - 150 out of 213 < 1 2 3 4 5 >