Patent US5018474A successfully refreshed from Google Patents.
Patent EP0500149A2 successfully refreshed from Google Patents.
EP0500149A2
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EP
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Apparatus for data recording disc playback
Assignee: Pioneer Corp
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Filing: 1987-04-15
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Granted: —
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Expires: 2007-04-15
Abstract
Abstract A data recording disc 1 contains a CD area in which a signal such as an audio signal is recorded in digital form and a video area in which a FM-modulated video signal is recorded with a digital audio signal superimposed thereon. The position of a data detection point of a pick-up is monitored 3, and the equalisation and amplifier gain of components 28b,28c,28e,28f of a digital demodulation system are automatically changed according to whether playback of the CD area or the video area is being executed so that a single demodulation system is used for both the digital signals from the CD area and the digital signals from the video area.
Inventors
- 👤 Masayuki C/O Pioneer Tokorozawa Plant Yoshida
- 👤 Izumi C/O Pioneer Tokorozawa Plant Ueda
- 👤 Hidehiro C/O Pioneer Tokorozawa Plant Ishii
- 👤 Takahumi C/O Pioneer Tokorozawa Plant Shiba
- 👤 Fumihiro C/O Pioneer Tokorozawa Plant Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 01:30
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/79; H04N9/80; H04N9/802; G; G11; G11B; G11B19/00; G11B19/02; G11B19/04; G11B19/12; G11B19/20; G11B19/28; G11B20/00; G11B20/10; G11B20/10009; G11B20/10527; G11B27/00; G11B27/10; G11B27/102; G11B27/105; G11B27/19; G11B27/28; G11B27/32; G11B27/327; G11B27/329; G11B7/00; G11B7/004; G11B7/005; G11B7/08; G11B7/085; G11B7/08505; G11B7/09; G11B7/0941; H04N5/00; H04N5/76; H04N5/7605; H04N5/91; H04N5/93; H04N5/931; H04N5/95; H04N9/7921; H04N9/7925; H04N9/82; H04N9/8205; H04N9/8211; H04N9/8222; G11B2220/00; G11B2220/20; G11B2220/25; G11B2220/2537; G11B2220/2545; G11B7/007; G11B7/0079; G11B7/095; G11B7/0953; H04N9/87; H04N9/8715; H04N9/89; H04N9/893; Y; Y10; Y10S; Y10S358/00; Y10S358/907
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A data recording disc playback apparatus capable of playback of a data recording disc (1) with predetermined data which has been subjected to digital modulation processing recorded in a first area of said disc and a video signal which has been subjected to frequency modulation processing recorded with a predetermined digital signal superimposed thereon in a second area of said disc disposed peripherally outward from said first area (fig. 8), the apparatus comprising: an equaliser circuit (28b,28e) for performing compensation of a frequency characteristic of a playback digital signal, and; means (47,28a) for detecting when a data detection point of a pickup of said apparatus reaches positions adjacent to respective boundaries of said first and second areas, and for producing a corresponding detection signal; wherein the improvement comprises: means (28a) for executing changeover of an equaliser characteristic of said equaliser circuit in accordance with indication of said first and second areas respectively by said detection signal.
Claim 2
Dependent Claim
178 words
A data recording disc playback apparatus capable of playback of a data recording disc (1) with predetermined data which has been subjected to digital modulation processing recorded in a first area of said disc and a video signal which has been subjected to frequency modulation processing recorded with a predetermined digital signal superimposed thereon in a second area of said disc disposed peripherally outward from said first area (fig. 8), the apparatus comprising: an equaliser circuit (28b,28e) for performing compensation of a frequency characteristic of a playback digital signal; an amplitude control circuit (28c,28f) for controlling an amplitude of said playback digital signal; means (15) for detecting when said data detection point has reached positions adjacent to respective boundaries of said first and second areas, and for producing a corresponding detection signal; wherein the improvement comprises: means (47,28a) for executing changeover of an equaliser characteristic of said equaliser circuit (28b,28e) and of a degree of control applied by said amplitude control circuit, respectively, in accordance with indication of said first and second areas respectively by said detection signal.
References Cited (Backward Citations)
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