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| Number | Title | Issue Date |
| 5283784 | Echo canceller processing techniques and processing Residual echo from an echo canceler circuit is reduced by a variable attenuator that operates in response to a processing circuit which determines and adjusts an attenuation factor. The attenuation factor is determined by comparing relative levels of the ... | 02/01/1994 |
| 5249225 | Self-balancing hybrid using digitally programmable attenuator for variable impedance elements A digitally programmable attenuator balances impedance across a two to four-wire hybrid to reduce echo. The hybrid can interface a two-wire bi-directional telephone line, used for both transmit and receive signals with four-wire circuits having separate u... | 09/28/1993 |
| 5216704 | Method for remote power fail detection and maintaining continuous operation for data and voice devices operating over local loops First and second ISDN modems are disposed at a subscriber location and telephone system central office and are arranged to operate in a normal mode, and in a bypass mode upon power failure at the subscriber location. The modems are coupled through the tel... | 06/01/1993 |
| 5157653 | Residual echo elimination with proportionate noise injection An echo canceller with an adaptive convolution processor for computing and subtracting an anticipated echo has a nonlinear processor coupled to the error signal and to the send output. The nonlinear processor is responsive to average values and attenuates... | 10/20/1992 |
| 4929849 | Noise suppression in recovery of clock from NRZ data A clock generator for extracting a clock signal from a data signal includes a timing recovery circuit operable to produce an output recovered clock which is synchronized with transitions occurring at its input. A circuit gates data transitions to the cloc... | 05/29/1990 |
| 4891808 | Self-synchronizing multiplexer A time division multiplexer is operable to sample data on parallel input channels at a sampling rate at least twice the data rate, to serially transmit the data for each channel in a respective time division, and to recover the data at a receive end. The ... | 01/02/1990 |
