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Class Information
Number: 381/5
Name: Electrical audio signal processing systems and devices > Binaural and stereophonic > Broadcast or multiplex stereo > Fm final modulation > Am subcarrier > Four discrete channels
Description: Subject matter where the independent sound signals are four in number.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5848129 |
Electronic billboard with telephone call-in control |
Dec. 8, 1998 |
| 5717765 |
Theater sound system with upper surround channels |
Feb. 10, 1998 |
| 5471534 |
Devices, systems and methods for composite signal decoding employing interpolation filter |
Nov. 28, 1995 |
| 4316058 |
Sound field transmission system surrounding a listener |
Feb. 16, 1982 |
| 4282401 |
System for transmission and reception of discrete four channel stereo |
Aug. 4, 1981 |
| 4245352 |
Automated system for testing radio receivers |
Jan. 13, 1981 |
| 4131851 |
Radio-signal receiver with plug-in modules |
Dec. 26, 1978 |
| 4075425 |
Multi-directional sound signal reproducing system |
Feb. 21, 1978 |
| 4061882 |
Quadrature multiplying four-channel demodulator |
Dec. 6, 1977 |
| 4037055 |
Stereophonic demodulator apparatus |
Jul. 19, 1977 |
| 4027107 |
Multiple channel FM stereo system |
May. 31, 1977 |
| 4016366 |
Compatible stereophonic receiver |
Apr. 5, 1977 |
| 4013841 |
Four-channel stereo receiver |
Mar. 22, 1977 |
| 3991374 |
Controllable bandwidth IF filter circuit for radio receivers |
Nov. 9, 1976 |
| 3985964 |
4-Channel stereophonic demodulating system |
Oct. 12, 1976 |
| 3983500 |
Angle modulated wave demodulation system |
Sep. 28, 1976 |
| 3980832 |
Decoder for four channel FM stereophonic composite signal having an Indicating signal wherein the indicating signal is detected and used in the decoding of the four channel composite signal |
Sep. 14, 1976 |
| 3970788 |
Monaural and stereo compatible multidirectional sound matrixing |
Jul. 20, 1976 |
| 3965302 |
Stereo signal demodulator in a four-channel stereo broadcast receiver |
Jun. 22, 1976 |
| 3961276 |
Stereo signal demodulator in a four-channel stereo broadcast receiver comprising means for performing delay equalization together with sampling of a composite signal |
Jun. 1, 1976 |
| 3944747 |
Multiple channel FM stereo system |
Mar. 16, 1976 |
| 3942126 |
Band-pass filter for frequency modulated signal transmission |
Mar. 2, 1976 |
| 3937896 |
Compatible four channel radio broadcast and receiving system |
Feb. 10, 1976 |
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