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7489915 |
Squelch circuit and communication apparatus used with the same
A squelch circuit and a communication apparatus used with the same that are able to generate a squelch signal even if a squelch period is short and an operation of a squelch detecting circuit is...
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7471938 |
Power clipping circuit and power clipping method
A power clipping circuit and method of the clipping circuit is provided. A power clipping circuit comprises, a selector which receives a baseband signal, and selects one of the baseband signal or a...
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7460847 |
Handheld audio system with radio receiver and method for use therewith
A radio receiver, optionally used in conjunction with a handheld audio system, includes a radio stage for processing a received radio signal into an audio signal. An audio stage produces an audio...
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7295631 |
Stereo demultiplexer
A stereo demultiplexer is proposed which can be calculation power efficiently implemented in a DSP. Modern digital FM receivers exploit the information content in the in quadrature component of the...
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7203471 |
System and method for selectively utilizing an attenuation device in a two-way radio receiver based on squelch detect and radio signal strength indication (RSSI)
A system and method used for controlling an attenuator in a two-way communication device ( 100, 200 ) includes the steps of measuring ( 211 ) a relative signal strength indication (RSSI) at the...
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7142818 |
Systems and methods for reducing radio receiver interference from an on-board avionics transmitter
Systems and methods for reducing interference in an enhanced radio receiver from a transmitter when both are located in the same aircraft are provided. The enhanced radio receiver detects and...
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7096051 |
Enhancing signals in a two-way radio system
Embodiments of the present invention can be used to enhance signals in a peer-to-peer radio system, such as a two-way radio system. In one embodiment, the invention includes receiving a...
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7027847 |
Communications system and method, wireless communications system, wireless microphone and wireless receiver
Herein disclosed a communications system according to the present invention comprises, a wireless microphone transmission apparatus for transmitting a radio microphone signal on a predetermined...
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7010328 |
Wireless communications system, wireless microphone transmission apparatus, and wireless receiving apparatus
Herein disclosed a communications system according to the present invention comprising: a wireless microphone transmission apparatus for transmitting a radio microphone signal on a predetermined...
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6914940 |
Device for improving voice signal in quality
Provided is a device for improving voice signal in quality by discriminating a radio environment of a signal transmission path and detecting a click noise. The device for improving voice signal in...
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6775527 |
Squelch circuit with adjustable reference level
A squelch circuit with an adjustable reference level, having an input level comparator with a first, a second, a third and a fourth current input terminal, a first and a second input terminal, and...
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6675002 |
System and method for automatically muting cellular telephone devices in noise sensitive areas
A system, apparatus and method for inhibiting the ringer of a cellular telephone within a noise sensitive area includes a transmitter for generating a control signal within the area. A receiver...
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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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6671503 |
Wireless microphone system
There is provided an improved receiver unit for wireless microphone system. The receiver unit accomplishes desirable mute control in accordance with state transmitting conditions of electric wave...
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6564041 |
System and method providing improved FM carrier squelch system
An improved squelch system ( 10 ) is provided in accordance with the present invention. The system includes a high-deviation subsystem ( 20 ) to detect a carrier with modulation, and a...
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6522899 |
Muting method in radio communication terminal
A muting method for a radio communication terminal. The method comprises setting a mute function; upon detection of a ring signal, muting bell and vibration; storing in a memory an absent message...
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6456833 |
Method for noise reduction in the reception of RF FM signals
A method for noise reduction during FM reception and a receiver executing the method. A detected audiosignal is being attenuated. A field strength indicative muting control signal is derived from...
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6397050 |
Multiband squelch method and apparatus
A squelch circuit for a radio receiver that detects the presence of speech by utilizing a filter bank for filtering an intermediate frequency or baseband signal from the radio receiver into...
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6397049 |
Two-way radio with improved squelch
A two-way radio ( 1 ) that has a radio frequency receiver ( 2 ) having a modulated radio frequency signal output and a variable bandwidth filter ( 3 ) with an input coupled to the modulated radio...
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6385440 |
Mobile communication receiver with asymmetric muting control
A mobile communication receiver generates an audio signal from a radio signal received on a communication channel, detects conditions on the communication channel, mutes the audio signal according...
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6374095 |
Method and apparatus for providing a squelch function on narrow band radio receivers
Squelch circuitry for narrow band audio receivers which uses a sub-audible tone or coded signal to modulate the intermediate frequency in accordance with the presence of a desired broadcast signal...
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6373398 |
Automobile tuner system
In a receiver, either an FM/AM signal to be used for a keyless entry system or a high frequency signal to be used for an automobile audio system for FM broadcast is applied to a first converter. An...
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6334060 |
Multi-channel or split-frequency, low frequency, telemetry circuit and method between transmitters and receivers
A multi-channel system is provided for both wide-band and narrow band low frequency transmission/reception of digital telemetry. The multi-channel system uses coherent detection having a high...
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6304828 |
System and method for calibrating a signal detection threshold circuit
The system and method for calibrating a signal detection threshold circuit is used in a radio frequency (RF) receiver, such as a in an early warning radar (EWR) system, in which a signal detection...
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6259904 |
Fast squelch circuit and method
A technique is used by a squelch circuit (200) that generates a fast squelch. The technique involves generating a noise signal (211) from a demodulated signal (105), generating a squelch check...
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6233443 |
Apparatus and method for reducing co-channel radio interference
An apparatus and method reducing interference between multiple frequency modulated, FM, voice transmissions present in the same frequency bandwidth by receiving a radio signal which includes a...
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6205130 |
Method and apparatus for detecting bad data packets received by a mobile telephone using decoded speech parameters
The mobile telephone detects bad data packets by decoding speech parameters represented by the packets and comparing those speech parameters against acceptable ranges of speech parameters. If the...
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6192226 |
Carrier squelch processing system and apparatus
Carrier squelch decisions are made by performing the steps of receiving an input signal (D), free of DC offset, having desired and undesired signal components, extracting the desired signal...
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6154663 |
Portable telephone communications system
A portable telephone communications system has a portable telephone terminal (300) and a repeater unit (100), and a remote receiver unit (200), wherein the repeater unit (100) includes a main power...
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6115589 |
Speech-operated noise attenuation device (SONAD) control system method and apparatus
A SONAD (110) control system (100) detects a received signal strength (RSSI) for a radio frequency (RF) signal (102), selects a threshold transfer function (400-404) in response thereto, generates...
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6108528 |
Receive squelch circuit having function of detecting pulse width
A receive squelch circuit detects a pulse width of an input data signal to prevent errors from occurring during detection of received data. The squelch circuit adds a function of detecting a pulse...
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6055421 |
Carrier squelch method and apparatus
A radio receiver operates primarily in a first operating mode to process received signals (410). When a carrier signal detect is triggered while in the first operating mode (415, 420), the receiver...
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6055416 |
Prevention of audible control signal transmission
A communication system having a radio master and a radio slave for communicating a communication signal and a control signal via a common channel is constructed by a receiver to receive a...
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6047170 |
Automatic squelch control for narrow band AM radio
An improved squelch circuit which utilizes a phase-locked-loop (PLL) arrangement to track the carrier signal and identify when audio communication should be curtailed. The lock detect circuit of...
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5995827 |
Method of muting a non-speaking cellular telephone caller participating in a conference call
A facility is provided in wireless communications system which causes a base station to substitute predetermined signals for speech and/or noise signals that are received from a wireless station...
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5970399 |
Radio channel squelching systems
Detection of in-band noise in a radio communications voice channel is provided by mixing a signal having a known frequency into a radio signal containing a voice channel signal in an in-band range,...
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5884151 |
Switching device for short time mute switching of reproduction of NF-signal in radio receiver
A circuit arrangement for brief mute switching of the reproduction of an LF signal in a radio receiver for performing additional control operations is described, in which the mute switching is...
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5881101 |
Burst serial tone waveform signaling method and device for squelch/wake-up control of an HF transceiver
A device and method for controlling HF single side band radio squelch operation in which a serial tone burst indicates the start and end of a transmission and identifies an on-going transmission....
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5870708 |
Method of and apparatus for scanning for and replacing words on video cassettes
A scanning apparatus for scanning a video recording for objectionable content is disclosed that includes an audio processor for analyzing the recording and recognizing the objectionable audio, and...
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5844938 |
Carrier based data operated squelch
A method for providing improved carrier based data operated squelch (CDOS) includes routines for recovering the carrier signal and for analyzing the received signal. The received signal is sampled...
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5745845 |
Receiver with automatic receiving-station switching function
A receiver with an automatic receiving-station switching function for automatically switching a current receiving frequency from a reception frequency of a broadcast wave in reception to a...
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5732340 |
FM receiver
An FM receiver capable of instantaneous muting while receiving a broadcast includes a switch circuit provided in series in an audio signal line in the front end of a deemphasizing capacitor, a...
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5708970 |
Wireless sound monitoring apparatus with subaudible squelch control
In a wireless sound monitoring system, ambient sounds are monitored by a microphone and transmitted over a phase or frequency modulated transmitter to a receiver. A sound actuated switch responsive...
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5697079 |
Audio signal editing device for use with a television
An audio editing device for use with a television including a memory device for storing data representative of predetermined audio signals. Also included is a comparator for comparing the digital...
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5675614 |
Digital squelch circuit
A digital squelch system (100) includes a timing signal generator (102) for generating a reference window. An edge detector (106) detects edges in the input signal during this reference window. An...
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5649321 |
Method and apparatus for determining audio band energy of a squelch circuit input signal
A squelch circuit (111) that is contained in an communications receiver (100) estimates (403, 405) the energy of an input signal in an audio band and in a first portion of the audio band. The...
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5575002 |
Method for muting a radio
When a portable radio (110) receives a transmission from a mobile radio (105), the portable radio (110) mutes a speaker volume of the portable radio (110) for a duration of the transmission from...
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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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5493711 |
Radio receiver for locating the strongest signal carrying a selected program
A receiver has a random counter, which outputs a timer signal to a control circuit. A zero-cross point detection circuit generates a detection signal which is input to the control circuit. When the...
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5490166 |
Data muting method and apparatus using delay circuits for communication systems
A receiver 700 having an audio output device 326 is disclosed. The receiver 700 receives a carrier signal modulated with data, voice, or a combination of both. The receiver 700 includes a...
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