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Class Information
Number: 379/351
Name: Telephonic communications > Supervisory or control line signaling > Signalling integrity protection (e.g., voice signal immunity)
Description: Subject matter including circuitry to distinguish between the supervisory or control signal and other signals on the line and prevent response to the other signals.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7103674 |
Apparatus and method of reducing dataflow distruption when detecting path maximum transmission unit (PMTU) |
Sep. 5, 2006 |
| 7076031 |
System and method for telephone signal collection and analysis |
Jul. 11, 2006 |
| 7003093 |
Tone detection for integrated telecommunications processing |
Feb. 21, 2006 |
| 6940966 |
Method and apparatus for detection of a telephone CPE alerting signal |
Sep. 6, 2005 |
| 6693993 |
Emergency notification and rescue request system |
Feb. 17, 2004 |
| 6671252 |
Robust signaling tone duration measurement |
Dec. 30, 2003 |
| 6584194 |
Telephone or communication terminal with improved calling alert signal detection by using an activity detector |
Jun. 24, 2003 |
| 6584195 |
Telephone apparatus |
Jun. 24, 2003 |
| 6563926 |
Resetting surge protection in telephone line interface circuits |
May. 13, 2003 |
| 6381330 |
False tone detect suppression using multiple frame sweeping harmonic analysis |
Apr. 30, 2002 |
| 6229889 |
Robust signaling tone frequency measurement |
May. 8, 2001 |
| 6212275 |
Telephone with automatic pause responsive, noise reduction muting and method |
Apr. 3, 2001 |
| 6122353 |
Method and apparatus for detecting a telephone CPE alerting signal |
Sep. 19, 2000 |
| 6115465 |
System and method for modifying voice signals to avoid triggering tone detectors |
Sep. 5, 2000 |
| 5960075 |
Switchmode power converters for telephone subscriber line interface circuits |
Sep. 28, 1999 |
| 5913189 |
Voice compression system having robust in-band tone signaling and related method |
Jun. 15, 1999 |
| 5889851 |
DTMF signal detection/removal using adaptive filters |
Mar. 30, 1999 |
| 5862212 |
Method and structure for detecting a customer premises equipment alerting signal |
Jan. 19, 1999 |
| 5850437 |
Transmission system with improved tone detection |
Dec. 15, 1998 |
| 5850438 |
Transmission system with improved tone detection |
Dec. 15, 1998 |
| 5841853 |
Telephone apparatus with interrupt call processing capability |
Nov. 24, 1998 |
| 5822404 |
System and method for identifying remote communications formats |
Oct. 13, 1998 |
| 5818929 |
Method and apparatus for DTMF detection |
Oct. 6, 1998 |
| 5793862 |
Information signal detection device and information signal detection method |
Aug. 11, 1998 |
| 5737407 |
Voice activity detector for half-duplex audio communication system |
Apr. 7, 1998 |
| 5729602 |
Programmable multi-tone voice message starting system |
Mar. 17, 1998 |
| 5675639 |
Voice/noise discriminator |
Oct. 7, 1997 |
| 5649002 |
Method and apparatus for detecting a telephone CPE alerting signal |
Jul. 15, 1997 |
| 5638436 |
Voice detection |
Jun. 10, 1997 |
| 5619564 |
Tone detector with improved performance in the presence of speech |
Apr. 8, 1997 |
| 5619565 |
Voice activity detection method and apparatus using the same |
Apr. 8, 1997 |
| 5598466 |
Voice activity detector for half-duplex audio communication system |
Jan. 28, 1997 |
| 5577117 |
Methods and apparatus for estimating and adjusting the frequency response of telecommunications channels |
Nov. 19, 1996 |
| 5563942 |
Digital call progress tone detection method with programmable digital call progress tone detector |
Oct. 8, 1996 |
| 5535271 |
Apparatus and method for dual tone multifrequency signal detection |
Jul. 9, 1996 |
| 5533118 |
Voice activity detection method and apparatus using the same |
Jul. 2, 1996 |
| 5533053 |
Low frequency common mode rejection in a clock circuit |
Jul. 2, 1996 |
| 5519764 |
Circuit and method for detecting error causing tones in a voice messaging system |
May. 21, 1996 |
| 5519774 |
Method and system for detecting at a selected station an alerting signal in the presence of speech |
May. 21, 1996 |
| 5495526 |
Tone-detection method for detecting at least one tone in a dual-tone multifrequency signal, call-progress method using the same |
Feb. 27, 1996 |
| 5479499 |
Sensor circuit for voice/fax switch with cascaded amplifier circuit |
Dec. 26, 1995 |
| 5467395 |
Telephone exchange apparatus |
Nov. 14, 1995 |
| 5459784 |
Dual-tone multifrequency (DTMF) signalling transparency for low-data-rate vocoders |
Oct. 17, 1995 |
| 5459781 |
Selectively activated dual tone multi-frequency detector |
Oct. 17, 1995 |
| 5450484 |
Voice detection |
Sep. 12, 1995 |
| 5438618 |
Vocal frequency suppression apparatus and method |
Aug. 1, 1995 |
| 5406621 |
Telephone tone analysis system |
Apr. 11, 1995 |
| 5353342 |
Adaptive multitone signaling method |
Oct. 4, 1994 |
| 5333191 |
Detection of multifrequency tone signals |
Jul. 26, 1994 |
| 5327492 |
Method for selectively controlling the propagation of dual-tone multi-frequency signals within a telecommunications network |
Jul. 5, 1994 |
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