US3754099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four channel stereophonic broadcasting system
Assignee: Pioneer Corp
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Filing: 1971-11-09
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Granted: 1973-08-21
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Expires: 1991-11-09
Abstract
Abstract A broadcasting system wherein a left front, a right front, a left rear, and a right rear signal are transmitted on a single radio frequency channel with no significant increase in bandwidth. It should be compatible, that is, it should give satisfactory monophonic and two channel stereophonic reception on receivers presently in use by the public.
Inventors
- 👤 S Takaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:16
CPC Classifications
H; H04; H04H; H04H20/00; H04H20/86; H04H20/88; H04H20/89
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
352 words
A four channel stereophonic composite signal broadcasting system comprising a transmitter and at least one receiver, said transmitter comprising: a. sources of left front (LF), right front (RF), left rear (LR) and right rear (RR) stereophonically related audio frequency signals, b. means for adding the audio frequency signals together to obtain first intermediate signals including an (LF + LR) signal and an (RF + RR) signal, c. means for subtracting said audio frequency signals one from the other to obtain second intermediate signals including an (LF - LR) signal and an (RF - RR) signal, d. means for adding said first and second intermediate signals to obtain an ((LF + LR) + (RF + RR)) or ''''A'''' signal and an ((LF - LR) + (RF - RR)) or ''''C'''' signal, e. means for subtracting said first and second intermediate signals one from the other to obtain an ((LF + LR) - (RF + RR)) or ''''B'''' signal and an ((LF - LR) - (RF - RR))or ''''D'''' signal, f. means for supressed carrier amplitude modulating the B signal on a carrier of 38 Khz producing a bandwidth of 23Khz-5Khz, g. means for suppressed carrier amplitude modulating the D signal on a carrier of 19Khz producing a bandwidth of 10Khz28Khz, h. means for combining the C signal and the modulated D signal to produce a first composite signal in which the C signal occupies a bandwidth of 30hz-9Khz and the modulated D signal occupies a bandwidth of 10Khz-28Khz, i. means producing a pilot signal at 19Khz, j. means for frequency modulating said first composite signal on a carrier of 85.5Khz + OR - 10Khz producing a bandwidth of 57.5Khz-113.5Khz, k. means for combining said A signal, said pilot signal, said modulated B signal, and said frequency modulated first composite signal to produce a second composite signal in which said A signal occupies the bandwidth 30hz-15Khz, said modulated B signal occupies the bandwidth 23Khz-53Khz, and said modulated first composite signal occupies the bandwidth 57.5Khz-113.5Khz, l. means for frequency modulating said second composite signal, and m. means for broadcasting said frequency modulated second composite signal.
Claim 2
Dependent Claim
352 words
A four channel stereophonic composite signal broadcasting system comprising a transmitter and at least one receiver, said transmitter comprising: a. sources of left front (LF), right front (RF), left rear (LR) and right rear (RR) stereophonically related audio frequency signals, b. means for adding the audio frequency signals together to obtain first intermediate signals including an (LF + LR) signal and an (RF + RR) signal, c. means for subtracting said audio frequency signals one from the other to obtain second intermediate signals including an (LF - LR) signal and an (RF - RR) signal, d. means for adding said first and second intermediate signals to obtain an ((LF + LR) + (RF + RR)) or ''''A'''' signal and an ((LF - LR) + (RF - RR)) or ''''C'''' signal, e. means for subtracting said first and second intermediate signals one from the other to obtain an ((LF + LR) - (RF + RR)) or ''''B'''' signal and an ((LF - LR) - (RF - RR))or ''''D'''' signal, f. means for supressed carrier amplitude modulating the B signal on a carrier of 38 Khz producing a bandwidth of 23Khz-5Khz, g. means for suppressed carrier amplitude modulating the D signal on a carrier of 19Khz producing a bandwidth of 10Khz28Khz, h. means for combining the C signal and the modulated D signal to produce a first composite signal in which the C signal occupies a bandwidth of 30hz-9Khz and the modulated D signal occupies a bandwidth of 10Khz-28Khz, i. means producing a pilot signal at 19Khz, j. means for frequency modulating said first composite signal on a carrier of 85.5Khz + OR - 10Khz producing a bandwidth of 57.5Khz-113.5Khz, k. means for combining said A signal, said pilot signal, said modulated B signal, and said frequency modulated first composite signal to produce a second composite signal in which said A signal occupies the bandwidth 30hz-15Khz, said modulated B signal occupies the bandwidth 23Khz-53Khz, and said modulated first composite signal occupies the bandwidth 57.5Khz-113.5Khz, l. means for frequency modulating said second composite signal, and m. means for broadcasting said frequency modulated second composite signal.
Claim 3
Dependent Claim
141 words
A broadcasting system as defined in claim 1 wherein said one receiver comprises: a. a first FM demodulator circuit for demodulating the received FM second composite signal, b. a first stereo decoder for obtaining an (LF + LR) signal and an (RF + RR) signal by using the output signal of said first FM demodulator circuit and a pilot signal, c. a second FM demodulator circuit for further demodulating the signal coming from the first FM demodulator circuit, d. a second stereo decoder for obtaining an (LF - LR) signal and an (RF - RR) signal by using the output signal of the second FM demodulator circuit and the pilot signal, and e. matrix circuit means for combining said (LF + LR), (RF + RR), (LF - LR) and (RF - RR) signals to obtain LF, LR, RF and RR signals.
Claim 4
Dependent Claim
347 words
A four channel stereophonic composite signal broadcasting system including a transmitter comprising: a. sources of left front (LF), right front (RF), left rear (LR) and right rear (RR) stereophonically related audio frequency signals, b. means for adding the audio frequency signals together to obtain first intermediate signals including an (LF + LR) signal and an (RF + RR) signal, c. means for subtracting said audio frequency signals one from the other to obtain second intermediate signals including an (LF - LR) signal and an (RF - RR) signal, d. means for adding said first and second intermediate signals to obtain an ((LF + LR) + (RF + RR)) or ''''A'''' signal and an ((LF - LR) + (RF - RR)) or ''''C'''' signal, e. means for subtracting said first and second intermediate signals one from the other to obtain an ((LF + LR) - (RF + RR)) or ''''B'''' signal and an ((LF - LR) - (RF - RR)) or ''''D'''' signal, f. means for supressed carrier amplitude modulating the B signal on a carrier of 38 Khz producing a bandwidth of 23Khz-53Khz, g. means for suppressed carrier amplitude modulating the D signal on a carrier of 19Khz producing a bandwidth of 10Khz-28Khz, h. means for combining the C signal and the modulated D signal to produce a first composite signal in which the C signal occupies a bandwidth of 30hz-9Khz and the modulated D signal occupies a bandwidth of 10Khz-28Khz, i. means for producing a pilot signal at 19Khz, j. means for frequency modulating said first composite signal on a carrier of 85.5Khz + or - 10Khz producing a bandwidth of 57.5Khz-113.5Khz, k. means for combining said A signal, said pilot signal, said modulated B signal, and said frequency modulated first composite signal to produce a second composite signal in which said A signal occupies the bandwidth 30hz-15Khz, said modulated B signal occupies the bandwidth 23Khz-53Khz, and said modulated first composite signal occupies the bandwidth 57.5Khz-113.5Khz, l. means for frequency modulating said second composite signal, and m. means for broadcasting said frequency modulated second composite signal.
Claim 5
Dependent Claim
347 words
A four channel stereophonic composite signal broadcasting system including a transmitter comprising: a. sources of left front (LF), right front (RF), left rear (LR) and right rear (RR) stereophonically related audio frequency signals, b. means for adding the audio frequency signals together to obtain first intermediate signals including an (LF + LR) signal and an (RF + RR) signal, c. means for subtracting said audio frequency signals one from the other to obtain second intermediate signals including an (LF - LR) signal and an (RF - RR) signal, d. means for adding said first and second intermediate signals to obtain an ((LF + LR) + (RF + RR)) or ''''A'''' signal and an ((LF - LR) + (RF - RR)) or ''''C'''' signal, e. means for subtracting said first and second intermediate signals one from the other to obtain an ((LF + LR) - (RF + RR)) or ''''B'''' signal and an ((LF - LR) - (RF - RR)) or ''''D'''' signal, f. means for supressed carrier amplitude modulating the B signal on a carrier of 38 Khz producing a bandwidth of 23Khz-53Khz, g. means for suppressed carrier amplitude modulating the D signal on a carrier of 19Khz producing a bandwidth of 10Khz-28Khz, h. means for combining the C signal and the modulated D signal to produce a first composite signal in which the C signal occupies a bandwidth of 30hz-9Khz and the modulated D signal occupies a bandwidth of 10Khz-28Khz, i. means for producing a pilot signal at 19Khz, j. means for frequency modulating said first composite signal on a carrier of 85.5Khz + or - 10Khz producing a bandwidth of 57.5Khz-113.5Khz, k. means for combining said A signal, said pilot signal, said modulated B signal, and said frequency modulated first composite signal to produce a second composite signal in which said A signal occupies the bandwidth 30hz-15Khz, said modulated B signal occupies the bandwidth 23Khz-53Khz, and said modulated first composite signal occupies the bandwidth 57.5Khz-113.5Khz, l. means for frequency modulating said second composite signal, and m. means for broadcasting said frequency modulated second composite signal.
Claim 6
Dependent Claim
146 words
A receiver for receiving the broadcast frequency modulated signal formed in accordance with claim 3, said receiver comprising a. a first FM demodulator circuit for demodulating the recieved FM second composite signal, b. a first stereo decoder for obtaining an (LF + LR) signal and an (RF + RR) signal by using the output signal of said first FM demodulator circuit and the pilot signal, c. a second FM demodulator circuit for further demodulating the signal coming from the first FM demodulator circuit, d. a second stereo decoder for obtaining an (LF - LR) signal and an (RF - RR) signal by using the output signal of the second FM demodulator circuit and the pilot signal, and e. matrix circuit means for combining said (LF + LR), (RF + RR), (LF - LR) and (RF - RR) signals to obtain LF, LR, RF and RR signals.
Claim 7
Independent Claim
322 words
A method of broadcasting a four channel stereophonic composite signal comprising the steps of a. generating left front (LF), right front (RF), left rear (LR) and right rear (RR) stereophonically related audio frequency signals, b. adding the audio frequency signals together to obtain first intermediate signals including an (LF + LR) signal and an (RF + RR) signal, c. subtracting said audio frequency signals one from the other to obtain second intermediate signals including an (LF - LR) signal and an (RF - RR) signal, d. adding said first and second intermediate signals to obtain an ((LF + LR) + (RF + RR)) or ''''A'''' signal and an ((LF - LR) + (RF - RR)) or ''''C'''' signal, e. subtracting said first and second intermediate signals one from the other to obtain an ((LF + LR) - (RF + RR)) or ''''B'''' signal and an ((LF - LR) - (RF - RR)) or ''''D'''' signal, f. suppressed carrier amplitude modulating the B signal on a carrier of 38Khz producing a bandwidth of 23Khz-53Khz, g. suppressed carrier amplitude modulating the D signal on a carrier of 19Khz producing a bandwidth of 10Khz-28Khz, h. combining the C signal and the modulated D signal to produce a first composite signal in which the C signal occupies a bandwidth of 30hz-9Khz and the modulated D signal occupies a bandwidth of 10Khz-28Khz, i. producing a pilot signal at 19Khz, j. frequency modulating said first composite signal on a carrier of 85.5Khz + or - 10Khz producing a bandwidth of 57.5Khz-113.5Khz, k. combining said A signal, said pilot signal, said modulated B signal, and said modulated first composite signal to produce a second composite signal in which said A signal occupies the bandwidth 30hz-15Khz, said modulated B signal occupies the bandwidth 23Khz-53Khz, and said modulated first composite signal occupies the bandwidth 57.5Khz-113.5Khz, l. frequency modulating said second composite signal, and m. broadcasting said frequency modulated second composite signal.
Claim 8
Independent Claim
322 words
A method of broadcasting a four channel stereophonic composite signal comprising the steps of a. generating left front (LF), right front (RF), left rear (LR) and right rear (RR) stereophonically related audio frequency signals, b. adding the audio frequency signals together to obtain first intermediate signals including an (LF + LR) signal and an (RF + RR) signal, c. subtracting said audio frequency signals one from the other to obtain second intermediate signals including an (LF - LR) signal and an (RF - RR) signal, d. adding said first and second intermediate signals to obtain an ((LF + LR) + (RF + RR)) or ''''A'''' signal and an ((LF - LR) + (RF - RR)) or ''''C'''' signal, e. subtracting said first and second intermediate signals one from the other to obtain an ((LF + LR) - (RF + RR)) or ''''B'''' signal and an ((LF - LR) - (RF - RR)) or ''''D'''' signal, f. suppressed carrier amplitude modulating the B signal on a carrier of 38Khz producing a bandwidth of 23Khz-53Khz, g. suppressed carrier amplitude modulating the D signal on a carrier of 19Khz producing a bandwidth of 10Khz-28Khz, h. combining the C signal and the modulated D signal to produce a first composite signal in which the C signal occupies a bandwidth of 30hz-9Khz and the modulated D signal occupies a bandwidth of 10Khz-28Khz, i. producing a pilot signal at 19Khz, j. frequency modulating said first composite signal on a carrier of 85.5Khz + or - 10Khz producing a bandwidth of 57.5Khz-113.5Khz, k. combining said A signal, said pilot signal, said modulated B signal, and said modulated first composite signal to produce a second composite signal in which said A signal occupies the bandwidth 30hz-15Khz, said modulated B signal occupies the bandwidth 23Khz-53Khz, and said modulated first composite signal occupies the bandwidth 57.5Khz-113.5Khz, l. frequency modulating said second composite signal, and m. broadcasting said frequency modulated second composite signal.
Claim 9
Dependent Claim
116 words
A method as defined in claim 5, further comprising receiving the broadcast FM composite signal by: a. frequency-demodulating the received FM second compOsite signal to obtain a first output signal, b. decoding the first output signal with the pilot signal to obtain an (LF + LR) signal and an (RF + RR) signal, c. further demodulating the first output signal to produce a second output signal, d. decoding the second output signal with the pilot signal to obtain an (LF - LR) signal and an (RF - RR) signal, and e. combining said (LF + LR), (RF + RR), (LF - LR) and (RF - RR) signals to reproduce the LF, LR, RF and RR signals.
Claim 10
Dependent Claim
120 words
A method of receiving the broadcast FM composite signal formed in accordance with the method of claim 5 and comprising: a. frequency-demodulating the received FM second composite signal to obtain a first output signal, b. decoding the first output signal with the pilot signal to obtain an (LF + LR) signal and an (RF + RR) signal, c. further demodulating the first output signal to produce a second output signal, d. decoding the second output signal with the pilot signal to obtain an (LF - LR) signal and an (RF - RR) signal, and e. combining said (LF + LR), (RF + RR), (LF - LR) and (RF - RR) signals to reproduce the LF, LR, RF and RR signals.
References Cited (Backward Citations)
US3708623A
Cited
US3679832A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |