Patent US3916104A successfully refreshed from Google Patents.
US3916104A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound signal changing circuit
Assignee: Nippon Columbia Co Ltd
•
Filing: 1973-05-21
•
Granted: 1975-10-28
•
Expires: 1993-05-21
Abstract
Abstract A sound signal changing circuit in which a sound signal component such as singing voice or the like contained in a signal reproduced from a pre-recorded tape, a record or the like is attenuated or removed and a sound signal from a microphone is inserted in the first-mentioned signal in place of the attenuated or removed signal component.
Inventors
- 👤 Takeaki Anazawa
- 👤 Satoshi Hase
- 👤 Kiyohiko Mitsuhashi
- 👤 Hiroshi Yonezu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:17
CPC Classifications
H; H04; H04H; H04H60/00; H04H60/02; H04H60/04
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
193 words
A circuit for eliminating a band of audio frequencies from a stereophonic audio signal and inserting an intermittent audio signal comprising, a left audio signal input terminal, a right audio signal input terminal, a pair of left and right phase splitters respectively connected to said left and right audio signal input terminals and each phase splitter producing two signals separated in phase by 180*, a pair of left and right adders respectively connected to said pair of left and right phase splitters and each adder receiving one of said two signals therefrom, a pair of phase shifters respectively receiving the second of said two signals from said pair of left and right phase splitters and each having the characteristics of band pass filters, one phase shifters receiving an input from said left channel phase splitter and supplying an input to the right channel adder, second phase shifter receiving an input from said right channel phase splitter and supplying an input to the left channel adder, a microphone supplying said intermittent source of audio signals connected to said pair of adders, and a pair of sound reproducers respectively connected to said pair of adders.
Claim 2
Dependent Claim
193 words
A circuit for eliminating a band of audio frequencies from a stereophonic audio signal and inserting an intermittent audio signal comprising, a left audio signal input terminal, a right audio signal input terminal, a pair of left and right phase splitters respectively connected to said left and right audio signal input terminals and each phase splitter producing two signals separated in phase by 180*, a pair of left and right adders respectively connected to said pair of left and right phase splitters and each adder receiving one of said two signals therefrom, a pair of phase shifters respectively receiving the second of said two signals from said pair of left and right phase splitters and each having the characteristics of band pass filters, one phase shifters receiving an input from said left channel phase splitter and supplying an input to the right channel adder, second phase shifter receiving an input from said right channel phase splitter and supplying an input to the left channel adder, a microphone supplying said intermittent source of audio signals connected to said pair of adders, and a pair of sound reproducers respectively connected to said pair of adders.
Claim 3
Dependent Claim
38 words
A circuit for eliminating a band of audio frequencies according to claim 1 including switching means for disconnecting said pair of phase shifters from said pair of adders when said microphone does not supply said intermittent audio signal.
Claim 4
Dependent Claim
22 words
A circuit for eliminating a band of audio frequencies according to claim 2 wherein said phase splitters comprise a pair of transistors.
Claim 5
Dependent Claim
59 words
A circuit for eliminating a band of audio frequencies according to claim 3 wherein said phase shifters each comprise two section R-C filters with the first section hAving a capacitor in the series leg and a resistor in the parallel leg and the second section having a capacitor in the parallel leg and a resistor in the series leg.
Claim 6
Dependent Claim
31 words
A circuit for eliminating a band of audio frequencies according to claim 2 wherein said switching means comprise mechanical switches closed when an intermittent audio signal is supplied by said microphone.
Claim 7
Dependent Claim
64 words
A circuit for eliminating a band of audio frequencies according to claim 4 wherein said switching means comprise a pair of field effect transistors connected between ground and the outputs of said phase shifters and said microphone connected to said pair of field effect transistors to ground the outputs of said phase shifters when an intermittent audio signal is not supplied from said microphone.
Claim 8
Dependent Claim
31 words
A circuit for eliminating a band of audio frequencies according to claim 6 including a rectifier and a Schmidt circuit connected between said microphone and said pair of field effect transistors.
Claim 9
Dependent Claim
156 words
A sound signal changing circuit comprising: a. a first means for reproducing a first sound signal in which a vocal component and musical component are contained; b. a second means for cancelling said vocal component from the output of said first means; c. a third means for producing a second sound signal containing a vocal component; d. a fourth means for mixing said second sound signal containing a vocal component with the output of said second means, wherein said vocal components of said first means are stereo signals which are the same level and phase, and wherein said stereo signals are applied to phase-splitters from which output signals opposite in phase and level are derived, said output signals from said phase-splitters with one phase are directly applied to adders, while output signals from said phase-splitters with the other phase are applied through phase-shifters to said adders to cancel vocal components having the same phase and level.
Claim 10
Dependent Claim
156 words
A sound signal changing circuit comprising: a. a first means for reproducing a first sound signal in which a vocal component and musical component are contained; b. a second means for cancelling said vocal component from the output of said first means; c. a third means for producing a second sound signal containing a vocal component; d. a fourth means for mixing said second sound signal containing a vocal component with the output of said second means, wherein said vocal components of said first means are stereo signals which are the same level and phase, and wherein said stereo signals are applied to phase-splitters from which output signals opposite in phase and level are derived, said output signals from said phase-splitters with one phase are directly applied to adders, while output signals from said phase-splitters with the other phase are applied through phase-shifters to said adders to cancel vocal components having the same phase and level.
References Cited (Backward Citations)
US1888467A
Cited
US2766378A
Cited
US3246081A
Cited
US3238304A
Cited
US3224115A
Cited
US3403224A
Cited
US3478167A
Cited
US3518375A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |