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| Number | Title | Issue Date |
| 4347404 | Control device for an automotive vehicle FM radio A control device for an FM car radio in which low frequency characteristics of the audio output signal are switched so that stereophonic music programs can be reproduced with enough bass sound and monaural speech or news programs can be reproduced without... | 08/31/1982 |
| 4302837 | FM Multiplex system for selectively delaying one of two audio signals An FM multiplex audio system wherein either stereo signals or signals of two languages can be simultaneously transmitted and where switch means are provided so as to selectively delay either of the language signals so that the listener will hear a first l... | 11/24/1981 |
| 4300019 | Method and apparatus for multiplying an electrical signal A multiplier circuitry which multiplies an electrical signal by a multiplier signal comprises an oscillator which oscillates at a frequency having a predetermined relationship with respect to the multiplier signal, a first signal generator for producing a... | 11/10/1981 |
| 4281217 | Apparatus and method for the identification of specially encoded FM stereophonic broadcasts A sub-audible in-band tone system is disclosed for identifying an FM stereophonic radio broadcast which is specially encoded, as with dynamic range improvement encoding or quadraphonic encoding, for example, A constant frequency pilot tone is added at a l... | 07/28/1981 |
| 4272788 | Receiver for television sound multiplex broadcasting and FM stereo multiplex broadcasting A receiver for selectively receiving either an FM-FM type television sound multiplex broadcasting or an FM-AM type FM stereo multiplex broadcasting includes a PLL (phase-locked loop) circuit for forming a 38 kHz switching carrier for demodulating an FM st... | 06/09/1981 |
| 4238642 | Angle-modulated stereo system An angle-modulated transmitter generates a two-channel stereo wave by double-sideband angle modulation of a carrier with a first signal, double-sideband angle modulation of the same carrier, delayed less than 90°, with a second signal, and addition of th... | 12/09/1980 |
| 4221930 | FM Defect compensation apparatus In systems which process frequency modulated carrier waves, such as video disc systems, video tape recorder/playback systems and radio systems, there are occasions where the FM signal suddenly drops to a low level. In the case of FM audio signals, these s... | 09/09/1980 |
| 4211978 | Cross-talk component cancellation circuit in an angle-modulated wave signal transmission system A cross-talk component cancellation circuit is used in an angle-modulated wave signal transmission system for transmitting first and second angle-modulated wave signals of at least two channels, wherein a cross-talk component of the second angle-modulated... | 07/08/1980 |
| 4151470 | Combined portable tape recorder and stereophonic receiver system An acoustic apparatus comprising a detachable combination of a stereophonic radio set and monaural tape recorder is disclosed. The tape recorder operates as a monaural element when decoupled from the stereophonic radio but includes a stereophonic head whi... | 04/24/1979 |
| 4092602 | Automatic frequency control for FM-receiver An apparatus for comparing frequency of an object signal with a given reference frequency, with a reference signal generator for developing a reference signal having the reference frequency. If the object signal is frequency-modulated, then its center fre... | 05/30/1978 |
| 4046973 | Combined portable tape recorder and stereophonic receiver system An acoustic apparatus comprising a detachable combination of a stereophonic radio set and monaural tape recorder is disclosed. The tape recorder operates as a monaural element when decoupled from the stereophonic radio but includes a stereophonic head whi... | 09/06/1977 |
| 4025856 | Antenna apparatus An omnidirectional antenna apparatus for processing received FM stereophonic radio signals to substantially eliminate multipath distortion in the stereophonic sound reproduced by a radio receiver coupled thereto.... | 05/24/1977 |
| 4006306 | Audio signal processing apparatus Improved audio reproduction apparatus permits upgrading a two channel high fidelity ("stereo") system to four channel ("quadraphonic") capability, while flexibly accommodating varying four channel source signal formats, e.g., four channel discrete, or enc... | 02/01/1977 |
