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| Number | Title | Issue Date |
| 7941114 | Noise measurement for radio squelch function A method implementable in an audio receiver having an input for receiving broadcast signals including a set of channels and a squelching controller includes converting the signals associated with each channel into respective digital signals, and tuning the digital s... | 05/10/2011 |
| 7180933 | Squelch circuitry for high speed high frequency operation A squelch circuit for operating at high speed and at high frequencies includes a squelch input unit, a low swing pre-amplifier and a sampling and decision circuit. The squelch input unit pre-processes the positive and negative signals of an input signal to generate ... | 02/20/2007 |
| 7167683 | Bad frame indicator for radio telephone receivers A method for identifying a bad GSM speed frame and simultaneously maintaining a frame erasure rate below a specified value. The method is based upon a joint use of four signal quality metrics: (1) frame CRC parity check; (2) estimated burst signal-to-noise ratio; (3... | 01/23/2007 |
| 6799026 | Handset diversity in wireless communications system A diversity reception handset includes a receiver for receiving pilot and plural increments of traffic sent from a base station within a service area of a wireless communications network. The handset includes at least two antennas, a switch for switching a receiver ... | 09/28/2004 |
| 6671504 | Radio squelch techniques A radio carrier signal is detected (20) after being converted to digital form and is filtered (22). A noise estimator (24) generates a noise estimate signal by estimating the noise in the detected signal due to atmospheric conditions and the noise due to ... | 12/30/2003 |
| 6628731 | Method and apparatus for controlling signal level in digital receiver The invention pertains to a method for controlling the signal level in a digital receiver, wherein the level of a received analog signal is controlled in an analog control circuit (35), whereafter the level of the analog signal coming from the analog cont... | 09/30/2003 |
| 5630217 | Error-free pulse noise canceler used in FM tuner A pulse noise canceler in which the sensibility of FM pulse noise detection is decreased when an FM wave exceeding the minimum bandwidth which is predetermined of an FM wave detector is input to the pulse noise canceler. In order to detect pulse noise fro... | 05/13/1997 |
| 5526530 | Receiver with squelching responsive to input signal frequency In a receiver in which a squelch operation is switched on/off while comparing a reception level for an input frequency with a reference level, the reference level is set every input frequency in accordance with variation of reception sensitivity for the i... | 06/11/1996 |
| 5166983 | Mute circuit for audio amplifiers A mute circuit for an audio amplifier has been provided. The mute circuit alternately switches from a normal mode of operation to a mute mode of operation. In the normal mode of operation, the mute circuit utilizes a first op amp circuit to amplify an inp... | 11/24/1992 |
| 4965854 | Noise blanker with continuous wave interference compensation A noise blanker is disclosed which blanks out impulse noise emanating from the alternator, ignition systems of rotor vehicles, and other sources. This is accomplished by delaying an input IF signal while generating a blanking gate pulse occurring at the s... | 10/23/1990 |
| 4507661 | Interfering noise pulse eliminator and its use in a dicke type radiometer circuit An apparatus and method removes interfering noise pulses from low-level ro-frequency signals through the application of a video-frequency circuit which causes detection of interfering pulses above an automatically and dynamically established threshold vo... | 03/26/1985 |
| 4334317 | Noise blanking circuitry in a radio receiver A radio receiver including an RF amplifier stage arranged to receive transmitted RF signals and noise signals from an antenna, a mixer stage for converting the RF signals to intermediate frequency (IF) signals and supplying the IF signals to a blanker gat... | 06/08/1982 |
| 4203073 | Radio receiver blanker gate A balanced, doubly tuned gate couples between the mixer and intermediate frequency (IF) stages of a conventional radio receiver. The network is comprised of a pair of matched transformers interconnected in a balanced configuration, with the first transfor... | 05/13/1980 |
| 4189679 | Noise detecting circuit having noise-immune AGC In an audio reproducing system including mixer means, intermediate frequency transformer means, first gate means and audio reproducing means following said first gate means, a noise detecting circuit comprising detector means for detecting a high frequenc... | 02/19/1980 |
| 4178552 | Noise eliminating circuit A noise eliminating circuit for an AM receiver wherein noise pulse component included in an amplitude modulated wave are eliminated by making the RF or IF stage of the receiver an open circuit during such noise, while at the same time, compensating for th... | 12/11/1979 |
| 4151471 | System for reducing noise transients A system for limiting the instantaneous value of a noise transient, by means of an electronic circuit wherein the amplitude of the total input signal being monitored is compared with a threshold value which is varied continuously according to the peak car... | 04/24/1979 |
| 4099127 | Audio frequency automatic muting arrangement An audio frequency muting arrangement includes one circuit for detecting intelligence signals in a received audio frequency signal, and a further circuit for detecting noise signals, so as to compare the levels of the noise and intelligence signals and to... | 07/04/1978 |
| 4053843 | Blanker inhibit circuit A radio receiver includes a blanker circuit for muting the receiver in response to interfering noise signals. The invention contemplates a transistor switch which, when biased to its nonconducting state, inhibits blanker action. The transistor is biased t... | 10/11/1977 |
| 4044309 | Automatic squelch circuit with hysteresis A radio receiver squelch circuit operative as a function of a comparison of the audio component level of the detected signal with the noise component level, so as to amplify and pass signals when the audio component exceeds the noise component by a predet... | 08/23/1977 |
