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| Number | Title | Issue Date |
| 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 channels. This invention provides for modem speed optimization by mini... | 10/09/2007 |
| 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 channels. This invention provides for modem speed optimization my mini... | 10/31/2006 |
| 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 piece of transmission equipment. The tap circuit incorporates all the req... | 05/30/2006 |
| 7039243 | Spectral encoding of information A data encoding scheme maps a set of data to a number of spectral components, each component having an amplitude, a phase and a unique frequency. From these mapped tones, an analog baseband signal can be formed, which, when implemented in a data transmission scheme,... | 05/02/2006 |
| 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 symbols than a maximum number; sub-strings having the maximu... | 06/04/2002 |
| 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 signal containing plural paths, each path having a correspond... | 04/09/2002 |
| 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 in accordance with a predetermined criterion based on the ... | 03/26/2002 |
| 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 change directly proportional to the rate of change of slope o... | 02/24/1987 |
| 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 coded signal S(p), a first integrator receiving on an input (... | 05/13/1986 |
| 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 CVSD CODEC to accurately track and convert a wide range o... | 09/10/1985 |
| 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 differentiated signal, integrating the clipped differentiated signal, ... | 05/01/1984 |
| 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 digital modulator, an analog signal to be converted to a ... | 03/20/1984 |
| 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 filter includes voltage-operated switches that switch one of ... | 09/20/1983 |
| 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 prediction filter comprising a local decoder receiving the sai... | 11/30/1982 |
| 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 companding schemes. The syllabic compandor provides a long term ... | 09/28/1982 |
| 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 differs from the optimum desired step size but causes converge... | 04/28/1981 |
| 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 delta signal is converted into an intermediate code, this in... | 07/12/1977 |
| 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 input signal is converted into a digital output, the outpu... | 09/07/1976 |
