Patent US1380097A successfully refreshed from Google Patents.
Patent US4220973A successfully refreshed from Google Patents.
US4220973A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-speed searching television tuner
Assignee: SKEPSY SA
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Filing: 1978-07-26
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Granted: 1980-09-02
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Expires: 1998-07-26
Abstract
Abstract A television tuning device having a circuit for continuously scanning at least one frequency band. Scanning can take place at two speeds and controls are provided for starting and stopping the scanning procedure. The scanning speed is automatically changed from high speed to low speed when a television channel is detected to allow ample time for scanning to be stopped manually. Alternatively, the scanning may be stopped automatically.
Inventors
- 👤 Emilio Macchetta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:45
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/18; H03J7/20; H03J7/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
128 words
A television tuning device comprising a circuit scanning means for continuously scanning at least one band of receivable frequencies, manual control means for starting and stopping said scanning, a terminal means for applying a switch signal to said scanning means for switching from a first band-scanning speed to a second band-scanning speed lower than the first, and detection means for detecting the presence of a television channel by comparing received synchronization signals with local signals generated in the television receiver and for applying a switch signal to said terminal means for switching from said first band-scanning speed to said second band-scanning speed in the presence of said switch signal so that the band scanning continues at said second band-scanning speed until the manual control means stops the scanning.
Claim 2
Dependent Claim
128 words
A television tuning device comprising a circuit scanning means for continuously scanning at least one band of receivable frequencies, manual control means for starting and stopping said scanning, a terminal means for applying a switch signal to said scanning means for switching from a first band-scanning speed to a second band-scanning speed lower than the first, and detection means for detecting the presence of a television channel by comparing received synchronization signals with local signals generated in the television receiver and for applying a switch signal to said terminal means for switching from said first band-scanning speed to said second band-scanning speed in the presence of said switch signal so that the band scanning continues at said second band-scanning speed until the manual control means stops the scanning.
Claim 3
Dependent Claim
87 words
A television tuning device according to claim 1, further comprising scanning stopping means for stopping the scanning automatically when a television channel has been correctly tuned in, speed reducing means for reducing band-scanning speed, and said detection means comprising first and second detecting means for detecting the presence of a television channel which act in sequence one after another for supplying to said speed reducing means control signals at successive instants so as to increase the effective time interval during which said scanning stopping means may operate.
Claim 4
Dependent Claim
47 words
A device according to claim 2, further comprising controlling means for controlling the tuning frequency of the receiver automatically for optimum tuning, said controlling means being activated or de-activated by said switch signal provided by the said detection means for detecting the presence of a television channel.
Claim 5
Dependent Claim
55 words
A device according to claim 1, in which said band-scanning circuit means includes means for generating scanning signals at increasing speed starting from the instant scanning commences, and means for stopping and restarting scanning when the presence of a television channel is detected so that scanning continues at the same speed as when it commenced.
Claim 6
Dependent Claim
34 words
A device according to claim 1, in which said detecting means includes a coincidence detector means for detecting coincidence between the synchronization signals received and picture tube deflection signals generated inside the television receiver.
Claim 7
Dependent Claim
61 words
A device according to claim 1, in which said manual control means includes two push-buttons, one for controlling commencement of band scanning from the lowest to the highest frequencies and the other for controlling commencement of band scanning in the opposite direction and in which scanning commences on pressing one of said buttons and stops upon release of the same button.
Claim 8
Dependent Claim
80 words
A device according to claim 3, in which said first detecting means for detecting the presence of a television channel includes a detector means for detecting coincidence between the synchronization signals of the received signal and picture tube deflection signals generated in the television receiver and said second detecting means includes a threshold comparator means for receiving the output signal of said controlling means and processing means for supplying by means of processing means a signal for stopping band scanning.
Claim 9
Dependent Claim
30 words
A device according to claim 7, in which said processing means are operative to supply a signal for restarting band scanning at the same speed at which it was commenced.
Claim 10
Dependent Claim
70 words
A device according to claim 7, in which said processing means includes a series circuit comprising a disabling circuit which receives the output signals of said first and second detecting means, a Flip Flop, and an exclusive OR logic circuit, which stop the scanning operation and prevent it from being continued until a new scanning-start signal is received from said controlling means and such as to reset the Flip Flop.
Claim 11
Dependent Claim
32 words
A device according to claim 9, further comprising means for resetting said series circuit when the receiver is turned on to prevent scanning from being commenced until the scanning-start signal is sent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |