EP0064847A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Improved television receiver monitoring apparatus
Assignee: Morgan Gary C
•
Filing: 1982-04-28
•
Granted: —
•
Expires: 2002-04-28
Abstract
Abstract An apparatus for monitoring the channel to which a television receiver is tuned regardless of whether or not the video signal passes through a video cassette recorder or cable television tuner. Signals inductively produced by the receiver are compared with like signals from a slave receiver which is tuned automatically by a sequencer to each channel in turn. The sequencer halts if the signals match, and steps the slave receiver to the next channel if there is no match. The apparatus uses digital pulse techniques and incorporates time delays to obtain signal matching whether the master receiver is tuned with or without a video cassette recorder or cable television tuner.
Inventors
- 👤 Thomas Mewes
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 21:20
CPC Classifications
H; H04; H04N; H04N5/00; H04N5/44; H04H; H04H60/00; H04H60/35; H04H60/38; H04H60/41; H04H60/43
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
165 words
1 . Apparatus for monitoring the channel to which a master television receiver is tuned, comprising means to produce a first pulse train characteristic of the video or audio content of the television channel to which the master receiver is tuned, means to produce a second pulse train characteristic of the video or audio content of the channel to which a slave receiver is tuned, means to compare the first and second pulse trains and produce a further pulse if the first and second pulse trains do not coincide, and means responsive to the further pulse to sequentially tune the slave receiver to the next available channel, characterized in that the duration of the pulses of the first pulse train are sufficient to enable the corresponding pulses of the second train to coincide with those of the first pulse train when the first pulses are delayed by passing through an auxilliary tuning device interposed between the source of the video signal and the master receiver.
Claim 2
Dependent Claim
165 words
1 . Apparatus for monitoring the channel to which a master television receiver is tuned, comprising means to produce a first pulse train characteristic of the video or audio content of the television channel to which the master receiver is tuned, means to produce a second pulse train characteristic of the video or audio content of the channel to which a slave receiver is tuned, means to compare the first and second pulse trains and produce a further pulse if the first and second pulse trains do not coincide, and means responsive to the further pulse to sequentially tune the slave receiver to the next available channel, characterized in that the duration of the pulses of the first pulse train are sufficient to enable the corresponding pulses of the second train to coincide with those of the first pulse train when the first pulses are delayed by passing through an auxilliary tuning device interposed between the source of the video signal and the master receiver.
Claim 3
Dependent Claim
29 words
The apparatus of claim 1, wherein the means to produce the first pulse train includes a monostable multivibrator which can be adjusted to alter the duration of the pulses.
Claim 4
Dependent Claim
45 words
3 . The apparatus of claim 1, wherein the means to produce the second pulse train includes two monostable multivibrators adjustable to introduce a time delay to compensate for the time delay of the first pulse train when it passes through the auxilliary tuning device.
Claim 5
Dependent Claim
42 words
The apparatus of claim 1, wherein said means to compare the first and second pulse train comprises a logic gate, which is enabled during a pulse of the first pulse train, and is activated when pulses of the second pulse train coincide.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.