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Class Information
Number: 455/219
Name: Telecommunications > Receiver or analog modulated signal frequency converter > Squelch > With automatic gain or volume control
Description: Subject matter combined with control of the amplification of the receiver without manual intervention.










Patents under this class:
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Patent Number Title Of Patent Date Issued
5732341 Method and apparatus for increasing receiver immunity to interference Mar. 24, 1998
5539781 Combining diversity apparatus with squelch function Jul. 23, 1996
5483692 Automatic variable radio volume control system Jan. 9, 1996
5483293 Output control circuit capable of carrying out a wide variety of fade operations Jan. 9, 1996
5448620 Volume control for a dual mode communications device Sep. 5, 1995
5394476 Volume control device Feb. 28, 1995
5355530 Receiver using receiving condition signal for correcting influence of the reception band width Oct. 11, 1994
5355531 Squelch circuit for volume control of a radio transmitter and receiver Oct. 11, 1994
5303409 Automatically compensated squelch circuit Apr. 12, 1994
5212827 Zero intermediate frequency noise blanker May. 18, 1993
5179577 Dynamic threshold data receiver for local area networks Jan. 12, 1993
4978926 Audio limiter using voltage multiplexed feedback Dec. 18, 1990
4731873 Squelch trigger circuit Mar. 15, 1988
4683386 Electronic attenuation value control circuit in which switching noise is suppressed Jul. 28, 1987
4654885 Mobile radio range extender with saw filter Mar. 31, 1987
4584714 Automotive radio receiver with radio frequency interference elimination circuit Apr. 22, 1986
4525870 Automotive radio receiver with radio frequency interference elimination circuit Jun. 25, 1985
4480335 Noise removing apparatus in an FM receiver Oct. 30, 1984
4479251 Noise blanker Oct. 23, 1984
4466129 Noise reducing circuitry for single sideband receivers Aug. 14, 1984
4461025 Automatic background noise suppressor Jul. 17, 1984
4411020 Power efficient radio receiver apparatus Oct. 18, 1983
4403349 Intermediate frequency detection circuit Sep. 6, 1983
4397040 UHF Receiver with decreased distortion due to multipath reception Aug. 2, 1983
4380824 Receiving reproducing system Apr. 19, 1983
4371981 Spectral squelch Feb. 1, 1983
4334317 Noise blanking circuitry in a radio receiver Jun. 8, 1982
4313215 Circuit for attenuating disturbing noise signals Jan. 26, 1982
4267598 Noise-memory regulated squelch compensator May. 12, 1981
4241453 Citizens band radio receiver with squelch control Dec. 23, 1980
4234959 Dual threshold repeater squelch circuit Nov. 18, 1980
4216430 Noise eliminating circuit with automatic gain control Aug. 5, 1980
4186354 Summing amplifier for developing a squelch and meter voltage in a radio receiver Jan. 29, 1980
4143331 Summing amplifier for developing a squelch and meter voltage in a radio receiver Mar. 6, 1979
4107613 Wireless microphone with FM receiver muting system responsive to excessive undesired AM level or low AGC control level Aug. 15, 1978
4060764 Transceiver audio system Nov. 29, 1977
4057761 Received signal selecting system with priority control Nov. 8, 1977
4041390 Transceiver squelch circuit Aug. 9, 1977
4013962 Improved receiver selecting (voting) system Mar. 22, 1977
3952252 Noise suppressor for telecommunication system Apr. 20, 1976

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