US4396949A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Television sound receiver
Assignee: Sony Corp
•
Filing: 1981-12-03
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Granted: 1983-08-02
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Expires: 2001-12-03
Abstract
Abstract A televison sound receiver includes an input terminal for receiving a television sound signal, a tuner connected to the input terminal, a channel selector connected to the tuner, an intercarrier sound demodulating circuit connected to the tuner, a split-carrier sound demodulating circuit connected to the tuner, a sound signal output terminal, and a switching device for selectively connecting one of the intercarrier and split-carrier sound demodulating circuits between the tuner and the sound signal output terminal and the switching device. The switching device includes a timing generator connected to the channel selector for generating a pulse signal of a predetermined period responsive to a channel selection period of the channel selector, a first operational circuit for normally connecting the split-carrier sound demodulating circuit operatively between the tuner and the sound signal output terminal, and a second operational circuit for connecting the intercarrier sound demodulating circuit operatively between the tuner and the sound signal output terminal during the predetermined period.
Inventors
- 👤 Toshiaki Meguro
- 👤 Susumu Tsuchida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:58
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04N5/60; H04N5/607
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
162 words
A television sound receiver comprising: an input terminal for receiving a television sound signal; a tuner connected to said input terminal; a channel selector connected to said tuner; an intercarrier sound demodulating circuit connected to said tuner; a split-carrier sound demodulating circuit connected to said tuner; a sound signal output terminal; and switching means for selectively and operatively connecting one of said intercarrier and split-carrier sound demodulating circuits between said tuner and said sound signal output terminal, characterized in that said switching means comprises a timing generator connected to said channel selector for generating a pulse signal of a predetermined period responsive to a channel selection period of said channel selector; first operational means for normally connecting said split-carrier sound demodulating circuit operatively between said tuner and said sound signal output terminal; and second operational means connected to said timing generator for connecting said intercarrier sound demodulating circuit operatively between said tuner and said sound signal output terminal during said predetermined period.
Claim 2
Dependent Claim
162 words
A television sound receiver comprising: an input terminal for receiving a television sound signal; a tuner connected to said input terminal; a channel selector connected to said tuner; an intercarrier sound demodulating circuit connected to said tuner; a split-carrier sound demodulating circuit connected to said tuner; a sound signal output terminal; and switching means for selectively and operatively connecting one of said intercarrier and split-carrier sound demodulating circuits between said tuner and said sound signal output terminal, characterized in that said switching means comprises a timing generator connected to said channel selector for generating a pulse signal of a predetermined period responsive to a channel selection period of said channel selector; first operational means for normally connecting said split-carrier sound demodulating circuit operatively between said tuner and said sound signal output terminal; and second operational means connected to said timing generator for connecting said intercarrier sound demodulating circuit operatively between said tuner and said sound signal output terminal during said predetermined period.
Claim 3
Dependent Claim
63 words
A television sound receiver according to claim 1, characterized in that said switching means comprises a door switch operative when said channel selector is in a pre-set condition, and third operational means responsive to said door switch for connecting said intercarrier sound demodulating circuit operatively between said tuner and said sound signal output terminal when said channel selector is in a pre-set condition.
Claim 4
Dependent Claim
53 words
A television sound receiver according to claim 1, characterized in that said switching means comprises off-tuning detector connected to said tuner; and means responsive to the output signal of said off-tuning detector for connecting said intercarrier sound demodulating circuit operatively between said tuner and said sound signal output terminal during said off-tuning period.
Claim 5
Dependent Claim
45 words
A television sound receiver according to claim 1 further comprising: a multiplexed sound decoder connected to said sound output terminal; a pair of audio output terminals derived from said multiplexed sound decoder; and a pair of speakers connected to said pair of audio output terminals.
Claim 6
Dependent Claim
110 words
A television sound receiver according to claim 1 wherein said intercarrier sound demodulating circuit includes an intercarrier sound detector connected to said tuner, and a first frequency discriminator connected between said intercarrier sound detector and said sound output terminal; and said split-carrier sound demodulating circuit includes a selective filter connected to said tuner for selecting sound carrier component in an output signal from said tuner, a mixer circuit connected to said selective filter, a local oscillator connected to said mixer circuit such that a frequency converted sound carrier component is obtained from said mixer circuit, and a second frequency discriminator connected between said mixer circuit and said sound output terminal.
Claim 7
Dependent Claim
154 words
A television sound receiver comprising: an input terminal for receiving a television sound signal; a tuner connected to said input terminal; a channel selector connected to said tuner; an intercarrier sound demodulating circuit connected to said tuner; a split-carrier sound demodulating circuit connected to said tuner; a sound signal output terminal; switching means for selectively and operatively connecting one of said intercarrier and split-carrier sound demodulating circuits between said tuner and said sound signal output terminals; and a control box containing channel preset means connected to said channel selector and having a door covering the top thereof, characterized in that said sound receiver comprises a door switch activated when said door is opened during a channel preset operation, and said switching means is responsive to said door switch and connects said intercarrier sound demodulating circuit operatively between said tuner and said sound output terminal when said door is opened during said channel preset operation.
Claim 8
Dependent Claim
154 words
A television sound receiver comprising: an input terminal for receiving a television sound signal; a tuner connected to said input terminal; a channel selector connected to said tuner; an intercarrier sound demodulating circuit connected to said tuner; a split-carrier sound demodulating circuit connected to said tuner; a sound signal output terminal; switching means for selectively and operatively connecting one of said intercarrier and split-carrier sound demodulating circuits between said tuner and said sound signal output terminals; and a control box containing channel preset means connected to said channel selector and having a door covering the top thereof, characterized in that said sound receiver comprises a door switch activated when said door is opened during a channel preset operation, and said switching means is responsive to said door switch and connects said intercarrier sound demodulating circuit operatively between said tuner and said sound output terminal when said door is opened during said channel preset operation.
References Cited (Backward Citations)
US3360604A
Cited
US4272788A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-01 | 1987-01-31 | 1987-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-01 | 1991-01-31 | 1991-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-01 | 1995-01-31 | 1995-08-02 | $7700.00 | Window Closed / Lapsed |