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Match Document Document Title
7372871 Techniques to reduce information loss and translation costs in a system populated with data sources and sinks communicating with multiple data representations  
Techniques for reducing overall information loss and processing costs due to data translation in a network populated with communicating data sources and sinks of multiple data representations is...
7224739 Controlled frequency signals  
In some embodiments, a transmitter includes first encoding controlled frequency output circuitry to creates a magnitude encoded controlled frequency signal (CFS) and second encoding controlled...
6920188 Method and apparatus for processing a multiple-component wide dynamic range signal  
An apparatus is provided for processing a wide dynamic range analog signal which comprises multiple components such as a signal with an in-phase component and a quadrature-phase component in for...
6643714 Modification and use of configuration memory used during operation of a serial bus  
Information stored in configuration memory of a first device coupled to a communication bus is exposed to other devices allowing the other devices to ascertain the functionality of the first...
6385656 Selective recompression of files in a network system  
A recompression server that automatically decompresses selected pre-compressed data streams and recompresses the decompressed data to a greater degree than the original pre-compressed data. In one...
6317613 Audio in a mobile receiver  
A system and method are disclosed whereby, in order to achieve a desired receive audio dynamic range compression factor (e.g., 2:1) at higher background noise levels, an analog mobile station's...
6111935 Adaptive expansion table in a digital telephone receiver  
A digital telephone (60) comprises send equipment (40) and receive equipment (50), coupled via a signal splitter/combiner (61) onto a digital telephone line (62) for communication with a remote...
5907584 System and method for transmitting and receiving a Lincompex signal having information encoded thereon through angle modulation  
The system and method of the present invention include a modulator which encodes data on a communication signal using angle modulation. The demodulator, receiving the angle modulated communication...
5689440 Voice compression method and apparatus in a communication system  
The present invention comprises a method for compressing a plurality of voice signals within a voice communication resource (see FIG. 6) having a given bandwidth within a voice communication system...
5678198 System for controlling signal level at both ends of a transmission link, based upon a detected value  
The present invention is directed to a dynamic range enhancing system for increasing the dynamic range of a transmission link, characterized as either an analog or digital link. The system includes...
5652782 Digital telephone overcoming international incompatibilities  
A digital telephone (60) comprises send equipment (40) and receive equipment (50), coupled via a signal splitter/combiner (61) onto a digital telephone line (62) for communication with a remote...
5631648 Signal compression or expansion circuit for mobile communication  
A signal-processing circuit adapted for signal compression and expansion performed in the transmitter and receiver of mobile communication equipment. The signal-processing circuit comprises a...
5495468 System and method for transmitting plural information waveforms over a single communications channel using lincompex techniques  
At least two information waveforms are transmitted over the same communications channel using Lincompex techniques. Each of the information waveforms are modulated using Lincompex techniques to...
5491685 System and method of digital compression and decompression using scaled quantization of variable-sized packets  
A system and method of compressing and decompressing a digital signal using scaled quantization of variable-sized packets of difference samples. Difference samples are generated and subdivided into...
5377255 RF repeaters for time division duplex cordless telephone systems  
An RF repeater for interfacing with a base station for exchanging transmit and receive signals in a time division duplex cordless telephone system comprises a multicarrier amplifier having an input...
5363207 Adaptor device for a facsimile  
Data produced from a transmission source facsimile are received by a simulated communication circuit network, and thus received data are compressed and temporarily stored into a memory. After the...
5249174 Time-division communication method for mobile bodies and system using said method  
A mobile body communication method using a gateway exchanging unit for exchanging a communication between a radio base station and a plurality of mobile radio units, the radio station constituting...
5182762 Modem having speed notifying means  
A modem is connected to a terminal equipment and couples to another modem via a transmission line. The modem includes a data transmission and reception part for making data transmission and...
5058202 System and method of transmitting and receiving a licompex modulated signal over a communication channel utilizing frequency modulation techniques  
A system for transmitting and receiving frequency modulated signals utilizes linked compressor/expander (Lincompex) techniques. The signal to be transmitted is first processed by a Lincompex...
4907217 System and method of transmitting a complex waveform over a communication channel utilizing lincompex techniques  
Complex waveforms may be transmitted using Lincompex techniques by frequency shifting either the complex waveform, its envelope, or both, in order to ensure that the compressed complex waveform and...
4823342 Time division exchange system having functions of compressing and expanding information  
A time division exchange provided with a plurality of compression circuits for carrying out signal compression in accordance with a plurality of compression laws and a plurality of expansion...
4740993 Digital companding circuit  
A circuit for companding digital signals, incorporating a bidirectional barrel shifter in the form of an array of transmission gate cells for shifting step bits of a compressed PCM signal a...
4597073 Full-duplex split-speed data communication unit for remote DTE  
The disclosed data communication equipment (DCE) provides full-duplex, split-speed data communication over 2-wire dial-up telephone circuits, typically between a host processor and data terminal...
4562571 Speech processing device for radioelectric equipment adapted for speech transmission and reception  
The device is of the type comprising a circuit for compressing the dynamic of the speech signal before transmission of the signal at constant level and an expander for re-establishing at reception...
4549304 ADPCM Encoder/decoder with signalling bit insertion  
In an ADPCM transmission system, signalling frames of an incoming multiplexed PCM signal are identified and signalling bits extracted therefrom. During each signalling frame, an ADPCM...
4542265 Echo canceller dynamic range extension  
Echo cancellers provide echo return loss enhancement by subtracting a replica of the echo signal from the echo returned via the two-wire to four-wire transition. The echo replica is derived from...
4535471 Compression/expansion device  
A compression/expansion device is adapted to compress and expand gains of additive and subtractive signals at each level of at least two audio signals, characterized in that each audio signal or...
4531208 Apparatus and method for reducing telephone channel power loading  
Conventional telephone systems including terminal equipments interconnected by a communications channel typically employ a supervisory tone transmitted by each terminal equipment to indicate its...
4513279 Charge redistribution mu-law PCM decoder  
An integratable mu-law PCM decoder including only a single operational amplifier having a unit valued feedback capacitor C1, and second and third unit valued switched capacitors C2 and C3. Switch...
4507650 Charge redistribution A-law PCM decoder  
An integratable mu-law PCM decoder including only a single operational amplifier having a unit valued feedback capacitor C1, and second and third unit valued switched capacitors C2 and C3. Switch...
4486876 Broadband transmission on limited bandwidth digital line  
To insure timing recovery, T carrier requires that the signal contain no more than fifteen consecutive zeros and a "1"s density of at least one out of eight. When a 15 kHz audio program signal is...
4468653 Charge redistribution mu-law PCM decoder  
An integratable PCM decoder requiring a total capacitance of only 32 times the normalized capacitance Co of the smallest capacitor thereof. The decoder comprises a source of positive and negative...
4396907 Digital to analog converter which uses main and auxiliary resistor networks  
A digital-analog converter functioning according to the μ-law wherein a sequence control receives an input digital signal and controls the position of a plurality of switches so as to selectively...
4388729 Systems for reducing noise in video signals using amplitude averaging of undelayed and time delayed signals  
Noise reduction of a signal such as a video signal is effected by averaging a plurality of relatively delayed replica signals, e.g. with line or field delays therebetween, in a decoding processor,...
4324000 Termination circuit for FDM/TDM processors  
An interface circuit is provided to convert serial, 30 channel, compressed, sign magnitude FDM-PCM data provided by a pair of voice communication codecs (code/decode) into parallel, 60 channel,...
4309676 Instantaneous compressor and instantaneous expandor  
An instantaneous compressor and an instantaneous expandor both of which use the logarithmic characteristics of diodes to provide compression and expansion, respectively, of uncompressed analog PAM...
4295223 Digital signal/noise ratio amplifier apparatus for a communication system  
The signal-to-noise ratio of a signal to be transmitted through a communication channel having an upper and lower limit in magnitude is sampled digitally and a common corrective factor for the...
4271499 Method and apparatus for digitally implementing a linked compressor-expander telecommunications system  
A linked compressor-expander (LINCOMPEX) circuit for use in telecommunications is implemented digitally. A speech compressor circuit in a modulator and a speech expander circuit in a demodulator...
4250492 Non-uniform weighting circuitry  
A non-uniform weighting circuitry which is effective for enhancing speed and accuracy in the operations of encoders and decoders comprises in a cascade connection a constant current switch, a...
RE30468 Signal compressors and expanders  
The invention concerns a dynamic range compressor type encoder or expander type decoder, in which a main signal component in a main path is boosted or bucked by a further signal component derived...
4234761 Method of communicating digital speech data and a memory for storing such data  
A method of communicating Digital Speech Data to a speech synthesis circuit. The data is compressed to on the order of 1000-1200 bits, per second for normal human speech. The speech synthesis...
4221934 Compandor for group of FDM signals  
A system to individually compress the volume range of each voice signal in a group of frequency-division-multiplexed voice signals, without frequency dividing the voice signals into separate...
4208740 Adaptive delta modulation system  
An adaptive delta modulation system is disclosed which features an improved digital compandor which may be used with a digital integrating network. The compandor executes a companding algorithm...
4205241 Quantized modulation systems  
A system for modulation of the amplitude of a d-c voltage, the amplitude of an a-c carrier, or the frequency of an a-c carrier by signal, in which the signal amplitude is continuously compared...
4151469 Apparatus equipped with a transmitting and receiving station for generating, converting and transmitting signals  
A transmitting and a receiving station for generating, converting and transmitting and receiving speech signals are disclosed. The transmitting station includes a transducer for converting an...
4059800 Digital multi-line companded delta modulator  
A companded digital delta modulator which can encode both voice and voice band modem signals over a wide range of input levels is shown. The companding method or algorithm is based on measuring bit...
4040049 Tandem block digital processor for use with nonuniformly encoded digital data  
In a PCM system, character compression using nearly instantaneous companding (NIC) is known to obtain a reduction in the number of bits transmitted. Unfortunately, in tandem digital...
3978409 Signal compressors and expanders  
The invention concerns a dynamic range compressor type encoder or expander type decoder, in which a main signal component in a main path is boosted or bucked by a further signal component derived...
3943466 Compander for TDM telecommunication system  
Amplitude samples of voice signals to be transmitted by pulse-code modulation are compared with a quasi-exponential reference voltage generated during each sampling interval while a binary counter...
3743790 TEE CONNECTION CIRCUIT FOR PCM TELEPHONE TRANSMISSION SYSTEMS  
A pulse code modulated telephony transmission arrangement provides a facility which enables an operator to "tee" across an established connection between two subscribers without breaking the...
Matches 1 - 50 out of 73 1 2 >