| Patent Number |
Title Of Patent |
Date Issued |
| RE31253 |
Echo cancellation in two-wire, two-way data transmission systems |
May 24, 1983 |
| An adaptive echo canceller for two-wire, simultaneous two-way data communication at full bandwidth uses Nyquist-interval, rather than baud-interval, processing to achieve independence from timing discrepancies between near-end and far-end terminals. The entire echo signal, and not me |
| 7369526 |
Flexible transport system including support for bilateral user access |
May 6, 2008 |
| One aspect of the present invention is a method for the wireless transmission of information from one or more antennas to one or more separate users. The method comprises processing information to produce transmission vectors that minimize simultaneous interference between separate u |
| 6035020 |
Modem data call bypass of a telephone network voice switch |
March 7, 2000 |
| A data bypass system diverts data calls to a central office based modem bank and a data network at the subscriber's discretion. The data call diversion is based on a data service prefix in the user's dialing string. The data bypass device translates a subsequent telephone address of a da |
| 5371532 |
Communications architecture and method for distributing information services |
December 6, 1994 |
| A store-and-forward architecture which stores and distributes information programs to subscribers on demand includes: information warehouses which archive information programs from multiple service vendors and dispense information programs in segments to central offices in high speed bur |
| 5341474 |
Communications architecture and buffer for distributing information services |
August 23, 1994 |
| A store-and-forward architecture which stores and distributes information programs to subscribers includes: information warehouses which archive information programs and dispense information programs in segments to central offices in bursts; central offices which manage subscriber's |
| 4827518 |
Speaker verification system using integrated circuit cards |
May 2, 1989 |
| A speaker verification and voice command system utilizing speech templates stored in an integrated circuit card is disclosed. To verify the user's identity, a comparison is made between a plurality of reference speech templates stored in the user's integrated circuit card and a test temp |
| 4453074 |
Protection system for intelligent cards |
June 5, 1984 |
| There is disclosed a protection system for intelligent cards. Each card has stored in it a code which is the encryption of a concatenation of a user secret password and a common reference text. The encryption is derived by an initialization terminal which uses the private key associated |
| 4253184 |
Phase-jitter compensation using periodic harmonically related components |
February 24, 1981 |
| A quadrature amplitude-modulated (QAM) data signal receiver employs a phase compensation arrangement (16, 31, 33) before the equalizer (17). The arrangement utilizes the assumption that the frequency components typically present in the phase perturbance are power-line related. This e |
| 4245345 |
Timing acquisition in voiceband data sets |
January 13, 1981 |
| In a multipoint data communication system using quadrature-amplitude modulation, a master modem (20) and a plurality of tributary modems (11a, 11b . . . 11n) are interconnected via respective transmission channels (13a, 13b . . . 13n, 16). Adaptive equalizer circuitry (55, 56) in the |
| 4237554 |
Coefficient tap leakage for fractionally-spaced equalizers |
December 2, 1980 |
| A quadrature amplitude modulated (QAM) data signal transmitted at T symbols per second is sampled in a data receiver at a rate of 2/T samples per second and applied to a transversal-type equalizer structure (25, 46, 34, 35) having taps spaced at T/2 second intervals. A demodulated equali |
| 4131767 |
Echo cancellation in two-wire, two-way data transmission systems |
December 26, 1978 |
| An adaptive echo canceller for two-wire, simultaneous two-way data communication at full bandwidth uses Nyquist-interval, rather than baud-interval, processing to achieve independence from timing discrepancies between near-end and far-end terminals. The entire echo signal, and not me |
| 4074086 |
Joint adaptive echo canceller and equalizer for two-wire full-duplex data transmission |
February 14, 1978 |
| An adaptive equalizer and echo canceller jointly respond to a common error difference between the actual output and the quantized digital output of a data receiver in a two-wire digital data transmission system to achieve simultaneous full-bandwith full-duplex operation. Two-wire transmi |
| 3932032 |
Motion picture sound synchronization |
January 13, 1976 |
| A system is described for digital, as opposed to the usual analog, recording of a sound track in synchronism with a visual image on a motion picture film and automatically reproducing the sound in synchronism with the visual image. In one embodiment of the invention, a camera employs a |
