H04H 20 - Arrangements for broadcast or for distribution combined with broadcast

Patents for H04H 20 - Arrangements for broadcast or for distribution combined with broadcast (21,050)
05/1978
05/16/1978	US4090220 Wired broadcasting systems for processing coded data representative of subscriber station conditions
03/1978
03/14/1978	US4079330 System for demodulating angle-modulated signals
03/14/1978	US4079204 AM Stereophonic transmission system
01/1978
01/10/1978	US4068100 Method and apparatus for transmitting and receiving amplitude modulated stereo
01/03/1978	US4066972 System for demodulating angle-modulated signals
12/1977
12/06/1977	US4061882 Quadrature multiplying four-channel demodulator
11/1977
11/15/1977	US4058770 Solid state subscriber selection switches for wired broadcasting systems
11/01/1977	US4056683 Audio transmitting and receiving system
09/1977
09/27/1977	US4051438 Co-channel multiple signal broadcasting system
09/06/1977	US4047109 Drive-in theater audio system
09/06/1977	US4047009 Digital tone generator for use with radio transmitters and the like
08/1977
08/09/1977	US4041244 Composite stereophonic signal generator
08/02/1977	US4039752 Fm four channel stereo signal generator
07/1977
07/19/1977	US4037250 Video switcher
07/19/1977	US4037055 Stereophonic demodulator apparatus
05/1977
05/31/1977	US4027107 Multiple channel FM stereo system
05/03/1977	US4021610 Control circuit for a matrixed four channel audio reproducing system
04/1977
04/19/1977	US4018994 Compatible AM stereophonic receivers
04/05/1977	US4016366 Compatible stereophonic receiver
03/1977
03/29/1977	US4015074 Voluntary information transmitting apparatus in a wired television system
03/22/1977	US4013966 Fm rf signal generator using step recovery diode
03/22/1977	US4013963 Wired broadcasting systems
03/22/1977	US4013841 Four-channel stereo receiver
02/1977
02/08/1977	US4007424 Transistor switches for selecting program signals in a wired broadcasting system
02/01/1977	US4006313 Transmitting and reproducing system having improved noise reduction characteristics for quadraphonic audio information signals
12/1976
12/07/1976	US3996518 Inductive carrier communication systems
11/1976
11/16/1976	US3992590 Matrix amplifying circuit
11/09/1976	US3991374 Controllable bandwidth IF filter circuit for radio receivers
11/09/1976	US3991277 Frequency division multiplex system using comb filters
10/1976
10/12/1976	US3985964 4-Channel stereophonic demodulating system
09/1976
09/21/1976	US3982069 Decoding apparatus for use in matrix four channel systems of a plurality of types
09/14/1976	US3980832 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
09/07/1976	US3979564 4-Channel stereo recording and reproducing method
08/1976
08/10/1976	US3974453 Stereophonic signal demodulator for a pair of composite signals with different AC signal levels and the same DC signal level
07/1976
07/27/1976	US3971986 Remote control system for radio receiver
06/1976
06/29/1976	US3967069 Compatible four channel FM system
06/22/1976	US3965302 Stereo signal demodulator in a four-channel stereo broadcast receiver
06/01/1976	US3961276 Stereo signal demodulator in a four-channel stereo broadcast receiver comprising means for performing delay equalization together with sampling of a composite signal
04/1976
04/27/1976	US3953686 Multichannel record disc recording system
04/20/1976	US3952157 Matrix four-channel decoding system
03/1976
03/16/1976	US3944749 Compatible AM stereophonic receivers involving sideband separation at IF frequency
03/16/1976	US3944747 Multiple channel FM stereo system
03/09/1976	US3943294 Multi-mono FM system
02/1976
02/10/1976	US3937896 Compatible four channel radio broadcast and receiving system
02/10/1976	US3937885 Control circuit for a matrixed four channel audio reproducing system
02/03/1976	US3936594 Secure television system
01/1976
01/20/1976	US3934201 Low power consumption stereo transmitter and receiver system
01/20/1976	US3934092 Four channel stereophonic broadcasting system
01/20/1976	US3934086 Matrix four-channel decoding system
01/06/1976	US3931482 Four-channel stereophonic reproducing system for reproducing discrete four-channel stereophonic discs

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