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Patent US4392247A successfully refreshed from Google Patents.
US4392247A
Expired / Lapsed
US
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Broadcast receiver with search tuning
Assignee: US Philips Corp
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Filing: 1981-04-22
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Granted: 1983-07-05
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Expires: 2001-04-22
Abstract
Abstract A broadcast receiver includes an automatic search tuning arrangement, the tuning being automatically selected on operation of switches which correspond to a number of regions (A . . . F) and other switches which correspond to the chosen program (VF, P 1 , P 2 or P 3 ). These switches cause a control circuit (59) to address a gate circuit (95) to sequentially produce an output corresponding to a subarea of a region to be applied to an address memory (93) of a memory circuit (23). The address memory in turn causes a memory (33, 35, 37 or 39) corresponding to the selected program to produce codes stored therein which correspond to the transmission frequencies of that program and which are used to control the output frequency of a local oscillator (7) via a phase locked loop. The transmission chosen for reception is determined by a count of the number of receivable transmissions corresponding to tuning data from one and the same group.
Inventors
- 👤 Theodorus H. M. van Deursen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:52
CPC Classifications
H; H03; H03J; H03J1/00; H03J1/0008; H03J1/0058; H03J1/0066; H03J1/0041; H03J1/005
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
324 words
A broadcast receiver including a search tuning circuit comprising a group selection circuit for selecting from a plurality of groups of tuning data stored in a memory circuit, each group of tuning data being associated with a given region, a search action of the search tuning circuit for scanning a selected group of tuning data being initiated when a transmission which corresponds to a tuning datum from the selected group provides reception which is too weak, the search action being terminated when a transmission which corresponds to a tuning datum from the selected group provides sufficiently strong reception, characterized in that the receiver further includes an automatic control circuit comprising means for activating said group selection circuit to select one of said groups of tuning data, a transmitter counter, means for initializing said transmitter counter and for activating said search tuning circuit for scanning said selected group of tuning data for a transmission that would provide sufficiently strong reception, means for incrementing said transmitter counter each time a transmission is accepted and for continuing said scanning by said search tuning circuit until said entire selected group of tuning data is scanned, means for causing said group selection circuit to select said selected group of tuning data if the number of accepted transmissions in said selected group of tuning data, as indicated by said transmitter counter, is equal to or exceeds a predetermined number, and means for reactivating said group selection circuit to select another one of said plurality of groups of tuning data for scanning if the number of accepted transmissions in said selected group of tuning data, as indicated by said transmitter counter, is less than said predetermined number, whereby said automatic control circuit automatically selects for reception, under the control of said counter, when this counter has counted a sufficient number of transmissions which are receivable with sufficient strength and which correspond to tuning data from the same group, that particular group.
Claim 2
Dependent Claim
324 words
A broadcast receiver including a search tuning circuit comprising a group selection circuit for selecting from a plurality of groups of tuning data stored in a memory circuit, each group of tuning data being associated with a given region, a search action of the search tuning circuit for scanning a selected group of tuning data being initiated when a transmission which corresponds to a tuning datum from the selected group provides reception which is too weak, the search action being terminated when a transmission which corresponds to a tuning datum from the selected group provides sufficiently strong reception, characterized in that the receiver further includes an automatic control circuit comprising means for activating said group selection circuit to select one of said groups of tuning data, a transmitter counter, means for initializing said transmitter counter and for activating said search tuning circuit for scanning said selected group of tuning data for a transmission that would provide sufficiently strong reception, means for incrementing said transmitter counter each time a transmission is accepted and for continuing said scanning by said search tuning circuit until said entire selected group of tuning data is scanned, means for causing said group selection circuit to select said selected group of tuning data if the number of accepted transmissions in said selected group of tuning data, as indicated by said transmitter counter, is equal to or exceeds a predetermined number, and means for reactivating said group selection circuit to select another one of said plurality of groups of tuning data for scanning if the number of accepted transmissions in said selected group of tuning data, as indicated by said transmitter counter, is less than said predetermined number, whereby said automatic control circuit automatically selects for reception, under the control of said counter, when this counter has counted a sufficient number of transmissions which are receivable with sufficient strength and which correspond to tuning data from the same group, that particular group.
Claim 3
Dependent Claim
20 words
A receiver as claimed in claim 1, characterized in that said automatic control circuit further comprises a manual control circuit.
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) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |