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Class Information
Number: 455/213
Name: Telecommunications > Receiver or analog modulated signal frequency converter > Frequency or phase modulation > With squelch or other audio output silencing > Using specified filter
Description: Subject matter in which the squelch or silencing action, or its reverse, is determined by a frequency discriminating means, specifically recited.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7587010 |
Complex filter circuit and receiver circuit |
Sep. 8, 2009 |
| 7567533 |
Packet detection system, packet detection device, and method for receiving packets |
Jul. 28, 2009 |
| 7519342 |
Tunable tracking filter |
Apr. 14, 2009 |
| 7499695 |
Configurable all-digital coherent demodulator system for spread spectrum applications |
Mar. 3, 2009 |
| 7463874 |
Complex digital signal channel select filter for analog cable television |
Dec. 9, 2008 |
| 7460831 |
System and method for excluding narrow band noise from a communication channel |
Dec. 2, 2008 |
| 7444129 |
Comb-line wireless filter |
Oct. 28, 2008 |
| 7352911 |
Method for bilateral filtering of digital images |
Apr. 1, 2008 |
| 7319797 |
Adaptive filters and apparatus, methods, and systems for image processing |
Jan. 15, 2008 |
| 7266351 |
Transconductance / C complex band-pass filter |
Sep. 4, 2007 |
| 7254200 |
System and method for frequency burst detection for GSM/GPRS |
Aug. 7, 2007 |
| 7181187 |
RF transmitter having improved out of band attenuation |
Feb. 20, 2007 |
| 7142836 |
Microwave filter distributed on circuit board of wireless communication product |
Nov. 28, 2006 |
| 7103334 |
Method and system for tuning quality factor in high-Q, high-frequency filters |
Sep. 5, 2006 |
| 7054606 |
Digitally calibrated narrowband filter with analog channel compensation |
May. 30, 2006 |
| 7054610 |
Wireless terminal device |
May. 30, 2006 |
| 7020448 |
Method for detecting a tone signal through digital signal processing |
Mar. 28, 2006 |
| 7002403 |
Transconductance/C complex band-pass filter |
Feb. 21, 2006 |
| 6985698 |
Impedeance matching circuit for a multi-band radio frequency device |
Jan. 10, 2006 |
| 6980771 |
CDMA wireless communication system including finite impulse response filter and phase equalizer for inter-chip interference reduction |
Dec. 27, 2005 |
| 6961551 |
Dual speed squelch circuit and method |
Nov. 1, 2005 |
| 6937871 |
Anti-demodulator circuit, filtering device and demodulator circuit |
Aug. 30, 2005 |
| 6922454 |
Direct conversion radio receiving system using digital signal processing for channel filtering and down conversion to base band |
Jul. 26, 2005 |
| 6904179 |
Method for minimal-logic non-linear filter implementation |
Jun. 7, 2005 |
| 6898419 |
Remotely adjustable bandpass filter |
May. 24, 2005 |
| 6856797 |
Programmable radio receiver bandpass filter for cordless/wireless systems |
Feb. 15, 2005 |
| 6785522 |
Method for changing timbre during conversation in cellular phone |
Aug. 31, 2004 |
| 6724246 |
Demodulation structure and method |
Apr. 20, 2004 |
| 6725023 |
Radio FM receiver |
Apr. 20, 2004 |
| 6671504 |
Radio squelch techniques |
Dec. 30, 2003 |
| 6405030 |
System for interception of digital cellular phone communication |
Jun. 11, 2002 |
| 6122404 |
Visible stokes polarimetric imager |
Sep. 19, 2000 |
| 6122496 |
Device and method for controlling frequency characteristic of a filter |
Sep. 19, 2000 |
| 5963273 |
Circuit for carrying out digital Nyquist filtering of IF intermediate frequency signals |
Oct. 5, 1999 |
| 5649321 |
Method and apparatus for determining audio band energy of a squelch circuit input signal |
Jul. 15, 1997 |
| 5615412 |
Digital squelch tail system and method for same |
Mar. 25, 1997 |
| 5572552 |
Method and system for demodulation of downlink CDMA signals |
Nov. 5, 1996 |
| 5535238 |
Spread spectrum adaptive power control communications system and method |
Jul. 9, 1996 |
| 5495507 |
Filter arrangement implementing a least squares method utilizing rotation matrices |
Feb. 27, 1996 |
| 5483690 |
Artificially reducing signal reproduction quality of received degraded digitally coded audio data |
Jan. 9, 1996 |
| 5450622 |
Method and apparatus for providing a very fast acting noise squelch control system for an RF radio receiver |
Sep. 12, 1995 |
| 5418821 |
Method and apparatus for sample-data receiver squelch |
May. 23, 1995 |
| 5357574 |
Coherent signal generation in digital radio receiver |
Oct. 18, 1994 |
| 5339463 |
FM receiver with muting circuit |
Aug. 16, 1994 |
| 5303405 |
Comparator switched squelch rectifier |
Apr. 12, 1994 |
| 5020141 |
Adaptive identifying signal detector |
May. 28, 1991 |
| 4914715 |
FM receiving circuit |
Apr. 3, 1990 |
| 4761829 |
Adaptive signal strength and/or ambient noise driven audio shaping system |
Aug. 2, 1988 |
| 4704736 |
Method and apparatus for reducing interference in broadcast receiver |
Nov. 3, 1987 |
| 4541101 |
Process and device for voice interpolation in a transmission system for digitized voice |
Sep. 10, 1985 |
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