US3830968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recording of audio and video signals in the same track
Assignee: TED Bildplatten AG AEG Telefunken Teldec
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Filing: 1973-04-23
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Granted: 1974-08-20
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Expires: 1993-04-23
Abstract
Abstract In the recording of a video signal and an audio signal in a single recording channel, with the recorded signal being a first carrier oscillation frequency modulated with the video information and a second carrier oscillation frequency modulated with the audio information, interferences which might occur in the audio signal as a result of the appearance of certain video signal frequencies are reduced by increasing the amplitude of the audio carrier oscillation whenever such frequencies appear in the video signal.
Inventors
- 👤 H Redlich
- 👤 J Gluth
- 👤 R Kossak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:43
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/802; H04N5/00; H04N5/76; H04N5/7605; H04N5/91; H04N5/92; H04N5/9201; H04N5/9202; H04N5/9204
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
160 words
In a system for recording, on a single track of a recording carrier, a video signal and an associated audio signal, the video signal being formed in a video processing channel in which a video carrier oscillation is frequency modulated with the video information and the audio signal being formed in an audio processing channel in which an audio carrier oscillation is frequency modulated with the audio information, the audio carrier oscillation having a frequency different from that of the video carrier oscillation and an amplitude less than that of the video carrier oscillation, the improvement comprising: means connected to monitor the frequencies in the video processing channel; and means connected to be controlled by said monitoring means for increasing the amplitude of the audio carrier oscillation being recorded upon receipt by said monitoring means of a predetermined frequency value which would cause interference with the audio information during playback, whereby the severity of such interference is at least reduced.
Claim 2
Dependent Claim
160 words
In a system for recording, on a single track of a recording carrier, a video signal and an associated audio signal, the video signal being formed in a video processing channel in which a video carrier oscillation is frequency modulated with the video information and the audio signal being formed in an audio processing channel in which an audio carrier oscillation is frequency modulated with the audio information, the audio carrier oscillation having a frequency different from that of the video carrier oscillation and an amplitude less than that of the video carrier oscillation, the improvement comprising: means connected to monitor the frequencies in the video processing channel; and means connected to be controlled by said monitoring means for increasing the amplitude of the audio carrier oscillation being recorded upon receipt by said monitoring means of a predetermined frequency value which would cause interference with the audio information during playback, whereby the severity of such interference is at least reduced.
Claim 3
Dependent Claim
37 words
An arrangement as defined in claim 1 wherein said monitoring means are connected to the video processing channel to monitor the frequencies of the video information before it is applied to frequency modulate the video carrier oscillation.
Claim 4
Dependent Claim
29 words
An arrangement as defined in claim 1 wherein said monitoring means are connected to said video processing channel to monitor the frequency of the frequency modulated video carrier oscillation.
Claim 5
Dependent Claim
57 words
An arrangement as defined in claim 1 wherein the amplitude of said audio carrier oscillation is normally 30 db below that of said video carrier oscillation aNd said means for increasing the amplitude of the audio carrier oscillation act to increase the amplitude thereof to a value of 15-20 db below that of the video carrier oscillation.
Claim 6
Dependent Claim
18 words
An arrangement as defined in claim 1 wherein the frequency value is that of the audio carrier oscillation.
Claim 7
Dependent Claim
26 words
An arrangement as defined in claim 5 wherein the frequency of the audio carrier oscillation is of the order of 1 MHz + or -50 KHz.
Claim 8
Dependent Claim
84 words
An arrangement as defined in claim 1 wherein said monitoring means comprise: filter means connected to receive the frequencies being monitored and adjusted to respond to the predetermined frequency; rectifier means connected to the output of said filter means for rectifying the response signal from said filter means; and setting value means connected between the output of said rectifier means and said audio processing channel for varying the amplitude of the audio carrier oscillation in depependence dependence the response signal from said filter means.
Claim 9
Dependent Claim
91 words
An arrangement as defined in claim 7 wherein said filter means comprises two filters each adjusted to respond to the predetermined frequency and connected to receive, respectively, the video information prior to frequency modulation of the video carrier oscillation and the frequency modulated video carrier oscillation; said rectifier means include two rectifiers each connected to the output of a respective filter; and said setting value means are connected to the output of both said rectifiers for producing a setting value corresponding to a combination of the responses of said two filters.
Claim 10
Dependent Claim
56 words
An arrangement as defined in claim 1 wherein said processing channels are arranged to process the signals therein in such a manner as to cause the audio carrier oscillation arriving at the carrier to have an increased value before the arrival at the carrier of the video signal portion causing such increased audio carrier oscillation amplitude.
Claim 11
Dependent Claim
73 words
An arrangement as defined in claim 9 wherein said video processing channel comprises a delay member connected between the connection of said monitoring means to said channel and the output of said channel for delaying the video signal by an amount sufficient to permit a portion of the audio carrier oscillation having an increased amplitude to arrive at the carrier before the portion of the video signal which resulted in such increased amplitude.
References Cited (Backward Citations)
US3482038A
Cited
US3652809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |