US3792199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reproducer device for fm stereo multiplex signals
Assignee: Pioneer Corp
•
Filing: 1970-09-14
•
Granted: 1974-02-12
•
Expires: 1990-09-14
Abstract
Abstract A receiving and reproducing device for multiplex broadcast signals whereby a monaural and a stereo signal can be received and further a multiplex signal which contains two independent signals, for example, a Japanese language signal and another language signal can be received and selectively reproduced. When a stereo signal is received, each circuit of this device automatically operates so as to reproduce the stereo signal. When a multiplex signal other than a stereo signal is received, each circuit operates so as to reproduce a main signal or a sub-signal of the multiplex signal according to the predetermined selection.
Inventors
- 👤 Y Saeki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:20
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/86; H04H20/88; H04H40/00; H04H40/18; H04H40/27; H04H40/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
336 words
An FM-FM system for reproducing FM multiplex signals comprising a pilot signal, a sub-signal and a main signal, said system comprising a first selector means for selecting said pilot signal, a second selector means for selecting said sub-signal, a third selector means for selecting said main signal, a first switch means connected to said first selector means and responsive to the output thereof, a second switch means connected to said first switch means and responsive to the output thereof, a third switch means connected to said second selector means and responsive to the output thereof, demodulator means coupled to said second selector means for demodulating the output thereof, fourth switch means connected to said demodulator means, said second switch means, and to said third selector means for passing the output of said demodulator means when there is no output from said first selector means and for passing the output from said third selector means when said first selector means produces an output or when neither said first selector means nor said second selector means produces an output, a manual switch means connected to said fourth switch means for causing said fourth switch means to pass either the output of said demodulator means or said third selector means, a fifth switch means connected to said demodulator circuit and to said first switch means for passing the output of said demodulator circuit when said first selector means produces an output, a phase inverter means connected to said fifth switch means for receiving the output thereof and for producing therefrom two signals 180* out of phase with each other, and a matrix circuit means connected to said phase inverter means and to said fourth switch means and for producing two outputs: the first comprising the sum of one of said two 180* out of phase signals and the output of said fourth switch means, and the second comprising the sum of the other of said two 180* out of phase signals and the output of said fourth switch means.
Claim 2
Dependent Claim
336 words
An FM-FM system for reproducing FM multiplex signals comprising a pilot signal, a sub-signal and a main signal, said system comprising a first selector means for selecting said pilot signal, a second selector means for selecting said sub-signal, a third selector means for selecting said main signal, a first switch means connected to said first selector means and responsive to the output thereof, a second switch means connected to said first switch means and responsive to the output thereof, a third switch means connected to said second selector means and responsive to the output thereof, demodulator means coupled to said second selector means for demodulating the output thereof, fourth switch means connected to said demodulator means, said second switch means, and to said third selector means for passing the output of said demodulator means when there is no output from said first selector means and for passing the output from said third selector means when said first selector means produces an output or when neither said first selector means nor said second selector means produces an output, a manual switch means connected to said fourth switch means for causing said fourth switch means to pass either the output of said demodulator means or said third selector means, a fifth switch means connected to said demodulator circuit and to said first switch means for passing the output of said demodulator circuit when said first selector means produces an output, a phase inverter means connected to said fifth switch means for receiving the output thereof and for producing therefrom two signals 180* out of phase with each other, and a matrix circuit means connected to said phase inverter means and to said fourth switch means and for producing two outputs: the first comprising the sum of one of said two 180* out of phase signals and the output of said fourth switch means, and the second comprising the sum of the other of said two 180* out of phase signals and the output of said fourth switch means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |