EP0205181A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
PCM audio signal recording and/or reproducing apparatus
Assignee: Sony Corp
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Filing: 1986-06-12
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Granted: —
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Expires: 2006-06-12
Abstract
Abstract @ A PCM (pulse code modulated) audio signal recording and/or reproducing apparatus, operates with plural scanning periods, in which a rotary head (RD) scans obliquely a longitudinal direction of a tape (TP), and which are separated into a plurality of segment periods. A PCM audio signal is recorded on one channel of a plurality of track channels, formed by the alignment of respective segment tracks (34) which are scanned by the rotary head (RD) during the same segment period of each scanning period, and an identifying signal, indicative of the fact that the PCM audio signal is already recorded, is superimposed upon the PCM audio signal and recorded together on the track channel, whereby it becomes possible to easily identify whether or not the PCM audio signal is recorded on the plurality of track channels.
Inventors
- 👤 Shinji Kakuyama
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 23:05
CPC Classifications
G; G11; G11B; G11B5/00; G11B5/02; G11B5/09; G11B15/00; G11B15/02; G11B15/05; G11B15/087; G11B15/12; G11B15/14; G11B20/00; G11B20/10; G11B20/10527; G11B27/00; G11B27/02; G11B27/031; G11B27/036; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3009; G11B5/008; G11B5/00813; G11B5/00847; G11B5/0086; G11B5/00865; G11B5/00869; G11B2220/00; G11B2220/90; G11B2220/91; G11B2220/913; G11B27/032
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
196 words
An apparatus for recording a plurality of PCM audio signals on a record medium, characterized in: a) audio signal processing means (2A, 4A) for converting said PCM audio signals into discrete and time-compressed digital signals; b) transducer means (H1, H3) responsive to said digital signals; c) transport means (RD) for establishing a relative scan of said transducer means (H1, H3) with respect to said record medium (TP), in a multiplicity of successive parallel tracks (34); d) switch means (SW1, SW2, SW3, SW4) selectively connecting said audio signal processing means (2A, 4A) to said transducer means (H1, H3); e) control means (9) for controlling said switch means (SW1, SW2, SW3, SW4) to supply said digital signals to said transducer means (H1, H3); f) pilot signal generating means (12) for generating a single frequency signal, which frequency is selected substantially lower than that of said tame-compressed digital audio signal; and g) mixing means (3A) for superimposing said time-compressed digital audio signal and said pilot signal, whereby, at the time of recording said PCM signal, an indication is recorded of the recording mode which is used, whereby the said recording mode may be recognized at the time of playback.
Claim 2
Independent Claim
196 words
An apparatus for recording a plurality of PCM audio signals on a record medium, characterized in: a) audio signal processing means (2A, 4A) for converting said PCM audio signals into discrete and time-compressed digital signals; b) transducer means (H1, H3) responsive to said digital signals; c) transport means (RD) for establishing a relative scan of said transducer means (H1, H3) with respect to said record medium (TP), in a multiplicity of successive parallel tracks (34); d) switch means (SW1, SW2, SW3, SW4) selectively connecting said audio signal processing means (2A, 4A) to said transducer means (H1, H3); e) control means (9) for controlling said switch means (SW1, SW2, SW3, SW4) to supply said digital signals to said transducer means (H1, H3); f) pilot signal generating means (12) for generating a single frequency signal, which frequency is selected substantially lower than that of said tame-compressed digital audio signal; and g) mixing means (3A) for superimposing said time-compressed digital audio signal and said pilot signal, whereby, at the time of recording said PCM signal, an indication is recorded of the recording mode which is used, whereby the said recording mode may be recognized at the time of playback.
Claim 3
Dependent Claim
53 words
Apparatus according to claim 1, characterised in that said means for recording is operative to record said PCM audio signal and said identifying signal in spacec-apart segment tracks on said tape (TP), whereby the several segment periods of each scanning period are individually identifiable as said. rotary head (RD) scans said tape (TP).
Claim 4
Dependent Claim
43 words
Apparatus according to claim 1 or 2, characterized in detecting means (H2, H3, 6α, 7α, 6β , 7β , 8 ) connected to said rotary head (RD) for developing a signal in response to detection of said identifying signal within said segment period.
Claim 5
Dependent Claim
50 words
Apparatus according to claim 3, characterized in that said detecting means comprises a band pass filter (6β) having a pass band including the frequency of said identifying signal and a detector (7β) connected to said filter (6β) for producing a signal in response to the output of said filter (6β).
Claim 6
Dependent Claim
83 words
Apparatus according to claim 3 or 4, characterized in that said rotary head (RD) comprises a pair of heads (H2, H3) and said signal producing means comprises a pair of band pass filters (6α, 6β) , one for each of said heads (H2, H3) each having a pass band including the frequency of said identifying signal, and a pair of detectors (7α, 7β) individually connected to said filters (6α, 6β) for producing signals in response to the output of said filters (6<C, 6β)
Claim 7
Dependent Claim
24 words
Apparatus according to any one of claims 1 to 5, characterized in means (12, 3A) for recording an index signal between adjacent segment tracks.
Claim 8
Dependent Claim
41 words
Apparatus according to claim 6, characterized in means (12) for generating said index signal, and means (3A) for combining said index signal with said superimposed PCM audio and identifying signals, whereby said index, identifying and PCM audio signals are recorded together.
Claim 9
Dependent Claim
83 words
Apparatus according to claim 6 or 7, characterized in means ( H 2, H3, 6 d, 7α, 6β , 7β, 8) connected to said rotary head (RD) and repsonsive to said recorded index signals for producing signals corresponding to the end of one of said segment periods and the begining of a subsequent segment period, and control means (9) connected to receive said signals and to enable said rotary head (RD) for recording or playback during a selected one of said segment periods.
Claim 10
Dependent Claim
32 words
Apparatus according to any one of claims 1 to 8, characterized in input means (11) for selecting an arbitrary one of said segment periods for recording or playback during each scanning cycle.
References Cited (Backward Citations)
No citation records indexed.
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