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Class Information
Number: 455/340
Name: Telecommunications > Receiver or analog modulated signal frequency converter > With particular receiver circuit > Coupling or decoupling between stages > Variably tunable or adjustable
Description: Systems wherein the coupling or decoupling means is recited as variably tunable or adjustable whereby the extent of the effective coupling or the width of the band passed by the network may be varied.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5995817 |
Device for varying the cutoff frequency of a low-pass filter |
Nov. 30, 1999 |
| 5987314 |
Radio communication apparatus having a high receiving sensitivity |
Nov. 16, 1999 |
| 5963842 |
Satellite broadcasting receiving tuner |
Oct. 5, 1999 |
| 5926752 |
Apparatus and method for remote convenience message transmission and control with a tunable filter receiver |
Jul. 20, 1999 |
| 5867777 |
Variable-gain amplifier circuit, offset control method in variable-gain amplifier circuit, radio receiver with variable-gain amplifier circuit, and radio receiving method in radio receiver wit |
Feb. 2, 1999 |
| 5822687 |
Method and apparatus for automatic tuning calibration of electrically tuned filters |
Oct. 13, 1998 |
| 5758276 |
Double super-heterodyne receiver with low-pass and high-pass filters controlled by respective switching devices |
May. 26, 1998 |
| 5758296 |
Mobile telephone receiver with adaptively inserted if filters and an if filter inserting method |
May. 26, 1998 |
| 5745856 |
Radio receiver for demodulating both wideband and narrowband modulated signals |
Apr. 28, 1998 |
| 5729755 |
Process for transmitting data in a data processing system with distributed computer nodes, communicating via a serial data bus, between which data messages are exchanged, tested for acceptance |
Mar. 17, 1998 |
| 5715531 |
Synchronous tracking filter circuit for a broadcast satellite tuner |
Feb. 3, 1998 |
| 5715529 |
FM receiver including a phase-quadrature polyphase if filter |
Feb. 3, 1998 |
| 5640698 |
Radio frequency signal reception using frequency shifting by discrete-time sub-sampling down-conversion |
Jun. 17, 1997 |
| 5613234 |
Receive filter using frequency translation for or in cellular telephony base station |
Mar. 18, 1997 |
| 5604927 |
Receiver having an adjustable bandwidth filter |
Feb. 18, 1997 |
| 5557642 |
Direct conversion receiver for multiple protocols |
Sep. 17, 1996 |
| 5555453 |
Radio communication system |
Sep. 10, 1996 |
| 5548839 |
Wide band radio-frequency converter having multiple use of intermediate frequency translators |
Aug. 20, 1996 |
| 5524288 |
Tuning of a radio receiver |
Jun. 4, 1996 |
| 5499392 |
Filter having a variable response time for filtering an input signal |
Mar. 12, 1996 |
| 5483209 |
Reception band switching circuit with variable attenuation control |
Jan. 9, 1996 |
| 5465410 |
Method and apparatus for automatic frequency and bandwidth control |
Nov. 7, 1995 |
| 5428829 |
Method and apparatus for tuning and aligning an FM receiver |
Jun. 27, 1995 |
| 5410742 |
SAW electric part and frequency conversion circuit |
Apr. 25, 1995 |
| 5408196 |
Tunable device |
Apr. 18, 1995 |
| 5404589 |
FM receiver with dynamic intermediate frequency (IF) filter tuning |
Apr. 4, 1995 |
| 5392456 |
Method of controlling filter time constant and filter circuit having the time constant control function based on the method |
Feb. 21, 1995 |
| 5369793 |
RF receiver adapted to process received RF pulses and reject RF continuous wave signals |
Nov. 29, 1994 |
| 5339463 |
FM receiver with muting circuit |
Aug. 16, 1994 |
| 5303413 |
AM radio receiver with switchable IF bandwidth |
Apr. 12, 1994 |
| 5287556 |
Interference reduction using an adaptive receiver filter, signal strength, and BER sensing |
Feb. 15, 1994 |
| 5287557 |
FM receiver |
Feb. 15, 1994 |
| 5280638 |
RF filter self-alignment for multiband radio receiver |
Jan. 18, 1994 |
| 5263187 |
Automatic gain control circuit |
Nov. 16, 1993 |
| 5222106 |
Interference detection and reduction |
Jun. 22, 1993 |
| 5216392 |
Automatically controlled varactor tuned matching networks for a crystal filter |
Jun. 1, 1993 |
| 5193213 |
FM broadcast band subcarrier receiver |
Mar. 9, 1993 |
| 5179727 |
Automatic adjusting circuit for an analog filter |
Jan. 12, 1993 |
| 5159711 |
Interference filter with high degree of selectivity for TVRO receiver system |
Oct. 27, 1992 |
| 5159709 |
Arrangement having tracking IF filter |
Oct. 27, 1992 |
| 5140700 |
FM resonant filter having AM frequency bypass |
Aug. 18, 1992 |
| 5129100 |
Agile output band pass filter for agile up converter |
Jul. 7, 1992 |
| 5101509 |
RF filter alignment using digital processor clock |
Mar. 31, 1992 |
| 5095534 |
Radio receiver having improved signal-to-noise ratio for receiving voice and data signals |
Mar. 10, 1992 |
| 5077835 |
Receiver circuit |
Dec. 31, 1991 |
| 5065453 |
Electrically-tunable bandpass filter |
Nov. 12, 1991 |
| 5031233 |
Single chip radio receiver with one off-chip filter |
Jul. 9, 1991 |
| 5023939 |
FM tuner with band extraction and optimization of a PLL FM demodulator |
Jun. 11, 1991 |
| 5023821 |
Digital filter operating at intermediate frequency |
Jun. 11, 1991 |
| 5020146 |
Lossy constant bandwidth tuned circuit |
May. 28, 1991 |
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