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Document Title |
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4282401 |
System for transmission and reception of discrete four channel stereo
A system for transmission and reception of discrete four channel stereo for utilizing a carrier frequency modulated in accordance with a modulation function of the form: f 1 (t)=A+Bsin 2ωt+Ccos...
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4280101 |
Stereophonic signal demodulation circuit
A stereophonic signal demodulation circuit receives an input signal including a signal modulated with first and second channel information to separate the first and second channel information from...
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4251690 |
Frequency-modulation stereophonic receiver
A control circuit of an FM stereophonic receiver includes two sets of symmetrically arranged transistor pairs which form a DC supply regulating circuit therein and are connected to respective...
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4221928 |
Noise reduction circuit for stereo signals
Noise reduction circuit for stereo signals comprising a control input terminal, first and second outputs as well as a controllable coupling circuit for a controllable mutual signal coupling between...
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4220818 |
AM Stereo transmitter
A transmitter for an independent sideband (ISB) AM stereo system is provided with a phase modulator which includes means for generating second order upper and lower sidebands which are proportional...
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4198543 |
Stereo composite processor for stereo radio receiver
A radio receiver is effective to receive a radio frequency signal and derive therefrom a standard stereo composite signal comprising a sum of channels signal having components within a first band...
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4166925 |
FM stereo demodulator
In an FM stereo demodulator, a detector circuit for detecting a low supply voltage is used. The detection level of this detector circuit is made substantially equal to a supply voltage value at the...
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4157455 |
FM stereophonic receiver having muting and mode changing
An FM stereophonic receiver includes a muting circuit for interrupting or reducing its signal reproduction output according to the electric field strength and a mode changing circuit for changing...
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4146747 |
FM stereo demodulating device
A sub-carrier switching signal is fed to a double balanced multiplier only when a pilot signal is detected, and the separation of the right and left channel outputs of the multiplier is performed...
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4091241 |
Stereo indicating circuit for an FM receiver
A stereo indicating circuit for use with an FM receiver having a multiplex demodulator, a stereo indicator and a stereo-monaural mode selector, the stereo indicating circuit comprising a smoothing...
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4032715 |
Circuit arrangement of a stereo-hunting device in a stereo decoder
A sum signal and a difference signal of two reproduction signals, in addition to a pilot tone, are obtained from a received signal in a circuit arrangement for a stereo-hunting device in a stereo...
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4032717 |
Circuit arrangement for a continuous adjustment of the base width in a stereo decoder
A circuit arrangement for a continuous adjustment of the base width in a stereo decoder in which a sum signal and a difference signal of two reproduction signals are obtained from a received signal...
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4030036 |
Bandwidth changing circuit
A bandwidth changing circuit comprising first and second transistors connected in differential configuration, a narrowband filter whose output is connected to an input electrode of the first...
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3999132 |
Stereo inhibit circuit
A stereo inhibit circuit adaptable for use in an FM stereo radio having a stereo indicating light is disclosed. A level detector and a mute circuit develop a mute signal which is related to the...
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3991374 |
Controllable bandwidth IF filter circuit for radio receivers
Controllable bandwidth IF filter circuit for radio receivers generally, but having particular application to quadraphonic radio receivers intended for use in a quadraphonic system that is...
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3944749 |
Compatible AM stereophonic receivers involving sideband separation at IF frequency
Amplitude modulation (AM) stereophonic transmission receivers for reception of a radiant energy carrier wave with two stereo related signals, each appearing as a first order single-sideband, the...
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3824346 |
FM STEREO DEMODULATOR
An FM stereo receiver having receiving means; demodulating signal generating means which produces a first demodulating signal having a fundamental frequency of 19 KHz and a phase the same as that...
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3790714 |
FM STEREOPHONIC RECEIVER
A receiver for stereophonic program signals which employs a narrow-band intermediate-frequency signal extracting circuit and a noise signal detecting circuit for producing a gate signal. The...
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3787629 |
APPARATUS FOR DISTINGUISHING BETWEEN VARIOUS FM BROADCAST MULTIPLEX TRANSMISSIONS
A 38kHz flag subcarrier accompanying an FM multiplex transmission identifies whether such multiplex transmission includes two channel or surround stereophonic information. Apparatus to provide such...
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3711652 |
MONOLITHIC STEREO DECODER WITH BALANCED DECODER OPERATION
A monolithic integrated circuit decoder for deriving stereophonically related audio frequency signals from a composite signal includes an input circuit for generating DC voltage-balanced signals...
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3707603 |
FM STEREOPHONIC RECEIVER DETECTION APPARATUS AND DISABLING MEANS
A detector for deriving stereophonic audio difference (L-R) signal from a stereophonic composite signal and matrix amplifier means coupled to the detector for combining the difference signals with...
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3634626 |
NOISE-OPERATED AUTOMATIC STEREO TO MONAURAL SWITCH FOR FM RECEIVERS
In an FM stereo receiver including an FM signal detector, a multiplex demodulating synchronous detector, and a circuit for coupling the output signal of the FM detector to one input of the...
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3573382 |
A STEREOPHONIC RECEIVER MUTING MEANS WITH SUBSTITUTION OF A DC CIRCUIT FOR AN AC CIRCUIT
A silicon monolithic integrated circuit stereo multiplex receiver includes a gated symmetrical demodulator for providing the desired left and right audio output signals. A second demodulator is...
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3569633 |
FM STEREO RECEIVER HAVING AUTOMATIC THRESHOLD SWITCHING CIRCUITRY
An FM stereo receiver circuit in which the reproduction is switched to the monophonic mode or cutoff entirely depending upon the amplitude of the high frequency noise superimposed upon the signal...
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3566037 |
STEREOPHONIC F.M. RECEIVERS HAVING AUTOMATIC SWITCHING MEANS FOR STEREO RECEPTION
"Motorboating" of an FM receiver adapted to reproduce both monaural and stereophonic signals is avoided by means of a positive feedback network connected between the output and input circuits of...
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3535459 |
STEREOPHONIC F.M. RECEIVERS HAVING AUTOMATIC SWITCHING MEANS FOR STEREO RECEPTION
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3423536 |
AUTOMATIC STEREO SWITCHING AND INDICATING CIRCUIT
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3388220 |
Monophonic and stereo fm receiver with automatic monophonic and stereo switching
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3384716 |
Switch means for automatic selection of monaural and stereo operation of an fm stereo receiver
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3377430 |
High-frequency stereo decoder containing electronic mono-stereo switching means
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3372238 |
Stereophonic decoders for f.m. receivers
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3329773 |
Method of selecting an fm stereophonic signal
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3327061 |
Radio receivers with change-over between fm stereo and fm monaural signals
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3309465 |
Stereophonic broadcast receiver circuit arrangement for systems operating with pilotignals
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3306980 |
Noise-limited type frequency multiplier for fm stereophonic receivers
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3305640 |
Arrangement for the stereophonic reproduction of signals
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3304375 |
Fm stereo multiplex receiver for automatically switching between stereophonic and monaural operation
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3297825 |
Monaural to stereo automatic switching system for an fm multiplex stereo radio receiver
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3296378 |
Monophonic-stereophonic automatic switching and demodulator circuit
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3296379 |
Monophonic-stereophonic automatic switching circuit
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3294912 |
Stereophonic fm receivers having automatic switching means for stereo reception
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3290443 |
Receivers of stereophonic programs from a single multiplex transmitting station
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3288936 |
Frequency modulation multiplex receiver using a visual indicator to control local oscillator
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3286034 |
Stereo pilot chain control transistor circuit
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3264414 |
Stereophonic fm receivers
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3258537 |
Frequency modulation sum and difference stereo having pre-detection compensating means
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3250857 |
Stereo fm receiver
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3249697 |
Fm multiplex stereo radio signal receivers
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3248484 |
Fm multiplex stereo receiver having selective bias to condition receiver for stereophonic reception only
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3219760 |
Mono-stereo control apparatus for fm multiplex stereo signal receiver system
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