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7548735 |
Signal detecting frequency counter
The invention provides an apparatus and a method for determining the frequency of a radio frequency signal. The coherency of a received signal is determined and only the frequency of a coherent...
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7519329 |
Determination of antenna noise temperature for handheld wireless devices
Antenna noise temperature is determined for a handheld wireless communication device which typically includes a radio, e.g. having a wireless transceiver and associated circuitry connected thereto,...
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7466959 |
Apparatus and method for IF switching in a dual-tuner, dual-IF, HD radio and FM/AM radio receiver
In a dual-channel HD radio receiver, when the broadband filter channel is compromised, the broadband channel is inactivated and the narrowband channel is activated. By mixing the signals of the two...
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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...
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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)...
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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...
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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...
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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 ),...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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3891928 |
Vlf phase tracker with phase discretion
VLF phase tracker apparatus for comparing phase of individual cycles of received signals with a reference tracked phase. If minimal noise is present, received phase is within close tolerance of the...
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3699457 |
NOISE BLANKER CIRCUIT INCLUDING RATE BIAS AND RATE SHUTOFF CIRCUITRY AND AUDIO BLANKING
A noise blanking circuit for decreasing the impulse noise in a receiver includes a noise channel which develops blanking pulses in response to impulse noise. The noise pulses are coupled to a stage...
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3366884 |
Radio frequency noise eliminating circuit
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3350650 |
Noise and audio controlled squelch circuit
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3339144 |
Pre-if noise silencer using a bi-directional transistorized gate
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3304503 |
Noise reducing system
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3284714 |
Noise reducing system
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3191124 |
Amplitude noise control gate
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3140446 |
Communication receiver with noise blanking
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3133990 |
Automatic level-adjustment circuit
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3056087 |
Noise blanking circuit
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3014127 |
Radio receiver with noise blanking
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