Patents
Sitemap › H04 - Electric communication technique › H04B - Transmission › H04B 14 - Transmission systems not characterised by the medium used for transmission
Patents for H04B 14 - Transmission systems not characterised by the medium used for transmission (7,274)
05/1982
05/04/1982US4328584 Method and arrangement for supervising signal amplitude converters
05/04/1982CA1123101A1 Data transmission system
04/1982
04/27/1982CA1122712A1 Method for transmitting video signals with the aid of dpc modulation and controlled quantizer
04/20/1982CA1122275A1 Frequency deviation measuring and adjusting system
04/06/1982US4323916 Data rate reduction for digital video signals by subsampling and adaptive reconstruction
04/06/1982US4323885 Noise and crosstalk reduction in mid-riser biased encoders
04/06/1982US4323730 Idle channel noise suppressor for speech encoders
04/01/1982WO1982001111A1 Self-clocking data transmission system
03/1982
03/30/1982CA1121057A1 Noise reduction method and apparatus for companded delta modulators
03/24/1982EP0048057A1 Arrangement for modulating the output signal of a converter, for example an electro-optical converter
03/17/1982EP0047589A1 Method and apparatus for detecting speech in a voice channel signal
03/17/1982EP0047386A1 Process for eliminating acoustic interference signals
03/16/1982US4320519 (Sin X)/X correction circuit for a sampled data system
03/16/1982US4320416 Technique for optimally encoding digitally encoded video signals
03/16/1982CA1120165A1 Echo canceller with logarithmic encoding
03/09/1982US4319360 Predictor stage for a digit rate reduction system
03/09/1982US4319082 Adaptive prediction differential-PCM transmission method and circuit using filtering by sub-bands and spectral analysis
03/09/1982CA1119724A1 Predictive speech signal coding with reduced noise effects
03/02/1982CA1119312A1 Recording of digital signals
03/02/1982CA1119303A1 Transmission and/or recording of digital signals
03/02/1982CA1119271A1 Receiver for digital signals in line code
02/1982
02/23/1982US4317233 Telephone subscriber station
02/23/1982US4317208 ADPCM System for speech or like signals
02/16/1982US4316223 Recording of digital signals
02/09/1982CA1118091A1 Block length multiple plus run length residue codes for run length encoding
02/04/1982WO1982000396A1 Adaptive reconstruction of information signals in a plural channel system
02/04/1982WO1982000390A1 Use of single reference voltage for analog to digital or digital to analog conversion of bipolar signals
02/03/1982EP0044963A1 Circuit for correcting the distortion of read signals from a PCM transmission apparatus, particularly from a digital audio disc
02/02/1982US4314370 Wireless intercommunication system
02/02/1982US4314105 Delta modulation method and system for signal compression
01/1982
01/27/1982EP0044713A1 Circuit arrangements for processing digital data
01/26/1982US4313204 Digital encoding circuitry with means to reduce quantization noise
01/26/1982US4313173 Linear interpolator
01/21/1982WO1982000226A1 Transform modulation system
01/19/1982US4312072 Radio frequency transmission system
01/07/1982WO1982000072A1 Analog-to-digital converter
12/1981
12/30/1981EP0042587A1 Method of transforming speech signals subdivided into signal segments for enciphered transmission, and apparatus for realizing this method
12/24/1981WO1981003728A1 Subscriber line audio processing circuit apparatus
12/24/1981WO1981003725A1 Interpolative analog-to-digital converter for subscriber line audio processing circuit apparatus
12/24/1981WO1981003724A1 Interpolative encoder for subscriber line audio processing circuit apparatus
12/16/1981EP0041895A1 Method and device for the transmission of digital data packets
12/15/1981US4306305 PCM Signal transmitting system with error detecting and correcting capability
12/15/1981US4306222 (b+a)-Bit D/A converter with b-bit auxiliary D/A converter
12/15/1981CA1114460A1 Digital filter arrangement for non-uniformly quantized pcm
12/10/1981WO1981003590A1 Converter of p-codes into analog values
11/1981
11/25/1981EP0040518A1 Data encoding and/or decoding
11/24/1981US4302631 Decimator apparatus for decreasing the word rate of a digital signal of the type employed in digital telephone systems
11/17/1981US4301446 Digital transmission system with a double analog integrator Delta Sigma coder and a double digital integrator Delta Sigma decoder
11/11/1981EP0039428A1 Protection against crackle noises for digital audio programme transmission
11/10/1981US4300236 Radio signalling systems
11/10/1981US4300233 Noise assessment of PCM regenerators
11/10/1981CA1112366A1 Apparatus for analog to digital conversion
11/03/1981US4298983 Automatic equalization system in FM communication circuit
10/1981
10/07/1981EP0037259A1 Circuit arrangement and method for reducing quantization distortion in a signal processing device
10/07/1981EP0037212A2 Methods and apparatuses for concealing error sample signals in digital television signals
09/1981
09/30/1981EP0036605A1 PCM system with transmitter side scrambler and receiver side descrambler
09/08/1981US4288873 Analogue to digital converters
08/1981
08/12/1981EP0033565A2 Adaptive delta modulator
07/1981
07/28/1981US4281318 Digital-to-digital code converter
07/21/1981US4280086 Method of and circuit arrangement for discharging a storage capacitor
07/14/1981US4278992 PCM Detector for video reproducer apparatus
07/08/1981EP0031450A1 Digital delta modulation compander
06/1981
06/30/1981US4276649 Receiver for digital signals in line code
06/30/1981US4276624 Acoustic transmission system
06/23/1981CA1103763A1 Signal injection technique
06/10/1981EP0030194A1 Predictive stage for a dataflow compression system
06/10/1981EP0030005A1 Circuit arrangement in a communication system with delta modulation
06/09/1981US4272846 Method for cancelling impulsive noise
06/03/1981EP0029607A1 Time-division multiplex system
06/03/1981EP0029490A1 Method of converting linear-coded digital signals into non-linear coded digital signals according to a multiple segment characteristic responding to the A law or the mu law
05/1981
05/27/1981EP0029226A1 System for processing audio PCM digital signals
05/26/1981US4270027 Telephone subscriber line unit with sigma-delta digital to analog converter
05/26/1981US4270026 Interpolator apparatus for increasing the word rate of a digital signal of the type employed in digital telephone systems
05/26/1981CA1102002A1 Digital multi-line companded delta modulator
05/13/1981EP0028307A1 Circuitry for an analog comparator
05/12/1981US4267596 Digital memory system
05/05/1981US4266296 Multipath distortion compensation circuit and method
04/1981
04/28/1981US4264974 Optimized digital delta modulation compander having truncation effect error recovery
04/22/1981EP0027233A1 Coding method for analog signals
04/07/1981CA1099018A1 Predictive encoder or decoder with selection of one of two or more prediction signals according to prediction error signal amplitudes
01/1981
01/28/1981EP0023182A1 Digital transmission system with delta-sigma coder with double analogue integration and delta-sigma decoder with double digital integration
01/22/1981WO1981000181A1 Method and apparatus for data-rate reduction
01/22/1981WO1981000180A1 Device for the estimation of image contours and application to the coding of television signals
01/20/1981US4245541 Apparatus for reducing noise in digital to analog conversion
01/13/1981US4245341 Device for transmitting stochastically coded information
01/13/1981CA1093697A1 Digital-to-analogue converter
01/13/1981CA1093696A1 Dynamic control of code modulated pulse transmission
01/07/1981EP0021948A1 Apparatus for following and recurringly estimating the local state of image contours and application to adaptive prediction for differential encoding of television signals
01/06/1981US4243977 Delta sigma to PCM converter
01/06/1981CA1093211A1 Tandem block digital processor for use with nonuniformly encoded digital data
12/1980
12/10/1980EP0020079A1 Encoder/decoder circuit
12/09/1980US4238850 Transmitter/receiver for single channel duplex communication system
12/09/1980US4238783 Telemetry system for transmitting analog data over a telephone line
11/1980
11/26/1980EP0019261A1 Adjustable attenuator for a digital telecommunication exchange, especially a telephone exchange
11/25/1980US4236244 Digital communications transmission system
11/11/1980US4233528 Sample-and-hold circuit with current gain
11/11/1980CA1089569A1 Binary multiplier circuit including coding circuit
11/04/1980CA1089099A1 Delta-modulation encoder
11/04/1980CA1089098A1 Transmission system for signal transmission by means of compressed delta modulations
10/1980
10/29/1980EP0018012A1 Digital telecommunication system for two-wire separated-site operation
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