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Class Information
Number: 379/339
Name: Telephonic communications > Repeater (e.g., voice frequency) > With signal conversion (e.g., dial to dtmf, analog to pcm)
Description: Subject matter which coverts a signal from variations in one parameter to variations of another.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7286089 |
Antenna unit and electrical connection device thereof and portable device having the same |
Oct. 23, 2007 |
| 7257220 |
Method and system for providing extended reach of a digital subscriber line signal |
Aug. 14, 2007 |
| 7158633 |
Method and apparatus for monitoring subscriber loop interface circuitry power dissipation |
Jan. 2, 2007 |
| 6829768 |
Information processing method and information processing apparatus |
Dec. 7, 2004 |
| 6757276 |
Touch tone replacement for internet telephony |
Jun. 29, 2004 |
| 6694010 |
Recognition of a single frequency tone |
Feb. 17, 2004 |
| 6671375 |
Telephone circuit |
Dec. 30, 2003 |
| 6665350 |
Method and system for improved analog signal detection |
Dec. 16, 2003 |
| 6628638 |
Method and apparatus for receiving diversity signals for use in OFDM radio communication system |
Sep. 30, 2003 |
| 6353621 |
Method to allow seamless service to mobile subscribers across various mobile switching centers supporting multiple intersystem standards |
Mar. 5, 2002 |
| 6185293 |
Signal matching apparatus for exchanging signals between an analog switching system and a digital switching system |
Feb. 6, 2001 |
| 6044147 |
Telecommunications system |
Mar. 28, 2000 |
| 5995557 |
Tone detection with aliasing bandpass filters |
Nov. 30, 1999 |
| 5937059 |
DTMF detector for detecting DTMF signals using a digital signal processing chip and method thereof |
Aug. 10, 1999 |
| 5878131 |
Interference attenuation for acoustic-dialers |
Mar. 2, 1999 |
| 5793862 |
Information signal detection device and information signal detection method |
Aug. 11, 1998 |
| 5754635 |
Apparatus and method for receiving multi-channel caller identification data |
May. 19, 1998 |
| 5715309 |
Conversion of compressed speech codes between attenuated and unattenuated formats |
Feb. 3, 1998 |
| 5557670 |
Channel interface unit |
Sep. 17, 1996 |
| 5557669 |
Channel interface unit |
Sep. 17, 1996 |
| 5500896 |
Code converter comprising protection circuit |
Mar. 19, 1996 |
| 5467395 |
Telephone exchange apparatus |
Nov. 14, 1995 |
| 5448635 |
Wiring scheme and network adapter with digital and analog outputs to allow old pots coexistence with ISDN |
Sep. 5, 1995 |
| 5386470 |
Repeaters for secure local area networks |
Jan. 31, 1995 |
| 5323460 |
Enhanced subscriber line interface circuit |
Jun. 21, 1994 |
| 5305377 |
Apparatus for providing an ISDN to analog interface |
Apr. 19, 1994 |
| 5289538 |
Circuit arrangement for signal and information conversion between analog junction lines and digital terminal devices in communications exchanges |
Feb. 22, 1994 |
| 5177781 |
Dialing pulse signature recognizing method and device |
Jan. 5, 1993 |
| 5163050 |
Configurable parameter DTMF detector |
Nov. 10, 1992 |
| 4852160 |
Channel unit interface circuit |
Jul. 25, 1989 |
| 4652703 |
Digital voice transmission having improved echo suppression |
Mar. 24, 1987 |
| 4633225 |
Impedance line matching device using feedback |
Dec. 30, 1986 |
| 4598173 |
Interface circuit for a subscriber line circuit |
Jul. 1, 1986 |
| 4591827 |
PCM coder-decoder |
May. 27, 1986 |
| 4588986 |
Method and apparatus for operating on companded PCM voice data |
May. 13, 1986 |
| 4575584 |
Fail-safe digital phone |
Mar. 11, 1986 |
| 4560840 |
Digital handsfree telephone |
Dec. 24, 1985 |
| 4467146 |
Echo canceller utilizing pseudo-logarithmic encoding law |
Aug. 21, 1984 |
| 4465902 |
Digital space phone system |
Aug. 14, 1984 |
| 4458113 |
Conductor pair identifier apparatus |
Jul. 3, 1984 |
| 4456991 |
Telephone line circuit and system |
Jun. 26, 1984 |
| 4432089 |
Digital loop transceiver for interfacing a digital PABX to a digital subscriber set via a subscriber line |
Feb. 14, 1984 |
| 4389544 |
Digital telephone apparatus |
Jun. 21, 1983 |
| 4382164 |
Signal stretcher for envelope generator |
May. 3, 1983 |
| 4370523 |
Process and apparatus for converting sound waves into digital electrical signals |
Jan. 25, 1983 |
| 4367456 |
PCM and PAM Conversion circuit including signal level variation on the PCM portion of the circuit |
Jan. 4, 1983 |
| 4302631 |
Decimator apparatus for decreasing the word rate of a digital signal of the type employed in digital telephone systems |
Nov. 24, 1981 |
| 4287392 |
Integrated circuitry for exchanging signals between telephone station and central office |
Sep. 1, 1981 |
| 4270027 |
Telephone subscriber line unit with sigma-delta digital to analog converter |
May. 26, 1981 |
| RE30294 |
Reversible analog to digital converter |
Jun. 3, 1980 |
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