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Class Information
Number: 381/3
Name: Electrical audio signal processing systems and devices > Binaural and stereophonic > Broadcast or multiplex stereo > Fm final modulation
Description: Subject matter where stereophonic signals are broadcast by means of a radio carrier wave which is only frequency modulated.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4712240 |
Transmission and reception of television broadcast in high-fidelity stereo audio |
Dec. 8, 1987 |
| 4709270 |
Circuit arrangement for filtering and demodulating a signal frequency-modulator with at least one audio signal |
Nov. 24, 1987 |
| 4685133 |
Wireless audio transmission system |
Aug. 4, 1987 |
| 4651106 |
Multiplex stereo demodulator |
Mar. 17, 1987 |
| 4633495 |
TV stereo adapter |
Dec. 30, 1986 |
| 4630134 |
System for recording and reproducing multiplex information |
Dec. 16, 1986 |
| 4611226 |
Television receiver incorporating a processing section for processing stereo/multichannel-sound signals |
Sep. 9, 1986 |
| 4586081 |
Method and apparatus for secure audio channel transmission in a CATV system |
Apr. 29, 1986 |
| 4523328 |
FM-receiver including a frequency-locked loop |
Jun. 11, 1985 |
| 4523329 |
FM receiver |
Jun. 11, 1985 |
| 4512031 |
Arrangement for receiving TV-signals having left and right stereo sound signals |
Apr. 16, 1985 |
| 4489430 |
FM Stereo demodulation circuit |
Dec. 18, 1984 |
| 4475244 |
Time-period modulation transmission system |
Oct. 2, 1984 |
| 4457012 |
FM Stereo apparatus and method |
Jun. 26, 1984 |
| 4399324 |
Multiplex demodulation circuit |
Aug. 16, 1983 |
| 4388496 |
FM/AM Stereo receiver |
Jun. 14, 1983 |
| 4370522 |
FM Receiver for use with motorcars |
Jan. 25, 1983 |
| 4369521 |
Radio receiving apparatus using headphone connector cable as an antenna |
Jan. 18, 1983 |
| 4347404 |
Control device for an automotive vehicle FM radio |
Aug. 31, 1982 |
| 4302837 |
FM Multiplex system for selectively delaying one of two audio signals |
Nov. 24, 1981 |
| 4300019 |
Method and apparatus for multiplying an electrical signal |
Nov. 10, 1981 |
| 4281217 |
Apparatus and method for the identification of specially encoded FM stereophonic broadcasts |
Jul. 28, 1981 |
| 4272788 |
Receiver for television sound multiplex broadcasting and FM stereo multiplex broadcasting |
Jun. 9, 1981 |
| 4238642 |
Angle-modulated stereo system |
Dec. 9, 1980 |
| 4221930 |
FM Defect compensation apparatus |
Sep. 9, 1980 |
| 4211978 |
Cross-talk component cancellation circuit in an angle-modulated wave signal transmission system |
Jul. 8, 1980 |
| 4151470 |
Combined portable tape recorder and stereophonic receiver system |
Apr. 24, 1979 |
| 4092602 |
Automatic frequency control for FM-receiver |
May. 30, 1978 |
| 4046973 |
Combined portable tape recorder and stereophonic receiver system |
Sep. 6, 1977 |
| 4025856 |
Antenna apparatus |
May. 24, 1977 |
| 4006306 |
Audio signal processing apparatus |
Feb. 1, 1977 |
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