Patent EP0329395A2 successfully refreshed from Google Patents.
EP0329395A2
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EP
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Magnetic recording and playback apparatus
Assignee: Victor Company of Japan Ltd
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Filing: 1989-02-15
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Granted: —
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Expires: 2009-02-15
Abstract
Abstract A magnetic recording and playback apparatus comprises a rotary drum having an inclined center of rotation to the running direction of a magnetic recording tape, a group of first and second channel recording heads and a group of first and second channel playback heads mounted on an outer periphery of the rotary drum at an angular interval of substantially 90 degrees, of which recording and playback heads alternate their positions along the outer periphery. The axial distance between the recording head group and the playback head group track pitch Tp of consequently formed tracks. The first and second channel recording heads alternately form first and second tracks in sequence on the magnetic recording tape, and after the second track is formed by the second recording head, a recorded signal on the first track is outputted by being traced with the first channel playback head.
Inventors
- 👤 Kazuhiko Morisaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 02:45
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/02; G11B15/12; G11B15/14; G11B27/00; G11B27/36; G11B5/00; G11B5/008; G11B5/00813; G11B5/00847; G11B5/0086
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
373 words
A magnetic recording and playback apparatus comprising recording head means for recording, while forming tracks in succession on a magnetic recording medium being wrapped around drum means in an angular range of substantially 90 degrees, a recording signal at least including a pulse code modulated (PCM) signal obtained by applying pulse code modulation to an information signal to be recorded together with pilot signals located before and after said PCM signal on a formed track, respectively, playback head means provided in correspondence with said recording head means and for tracing said tracks formed on said medium to reproduce said recording signal, and said drum means comprising a rotary drum having a rotary axis · inclined at a fixed angle with respect to the running direction of a magnetic recording tape as said medium and having said recording head means and said playback head means mounted on an outer peripheral surface thereof, characterized in that: said recording head means is composed of two recording heads of first and second channels provided at positions angularly spaced to each other by 180 degrees, respectively, and having azimuth angles different from each other; the playback head means is composed of two playback heads of the first and second channels provided at positions angularly spaced to each other by 180 degrees, respectively, and having azimuth angles different from each other but common in corresponding channels to the two recording heads, said first channel recording head, said second channel playback head, said second channel recording head and said first channel playback head are arranged in a recited order along the outer peripheral surface in a direction opposite to a rotating direction of the rotary drum, and an angular interval between two adjacent heads among the first channel recording and playback heads and second channel recording and playback heads, is substantially 90 degrees, and an axial distance refered to the rotary axis of said rotary drum between said recording head means and corresponding playback head means of channel, is "7/4·Tp" where Tp is a nominal track pitch of said tracks and selecting means for selectively supplying the recording signal to said first and second channel recording heads and selectively outputting a signal from said first and second channel playback heads.
Claim 2
Dependent Claim
373 words
A magnetic recording and playback apparatus comprising recording head means for recording, while forming tracks in succession on a magnetic recording medium being wrapped around drum means in an angular range of substantially 90 degrees, a recording signal at least including a pulse code modulated (PCM) signal obtained by applying pulse code modulation to an information signal to be recorded together with pilot signals located before and after said PCM signal on a formed track, respectively, playback head means provided in correspondence with said recording head means and for tracing said tracks formed on said medium to reproduce said recording signal, and said drum means comprising a rotary drum having a rotary axis · inclined at a fixed angle with respect to the running direction of a magnetic recording tape as said medium and having said recording head means and said playback head means mounted on an outer peripheral surface thereof, characterized in that: said recording head means is composed of two recording heads of first and second channels provided at positions angularly spaced to each other by 180 degrees, respectively, and having azimuth angles different from each other; the playback head means is composed of two playback heads of the first and second channels provided at positions angularly spaced to each other by 180 degrees, respectively, and having azimuth angles different from each other but common in corresponding channels to the two recording heads, said first channel recording head, said second channel playback head, said second channel recording head and said first channel playback head are arranged in a recited order along the outer peripheral surface in a direction opposite to a rotating direction of the rotary drum, and an angular interval between two adjacent heads among the first channel recording and playback heads and second channel recording and playback heads, is substantially 90 degrees, and an axial distance refered to the rotary axis of said rotary drum between said recording head means and corresponding playback head means of channel, is "7/4·Tp" where Tp is a nominal track pitch of said tracks and selecting means for selectively supplying the recording signal to said first and second channel recording heads and selectively outputting a signal from said first and second channel playback heads.
Claim 3
Dependent Claim
20 words
A magnetic recording and playback apparatus as set forth in claim 1, wherein said angular interval is exactly 90 degrees.
Claim 4
Dependent Claim
65 words
A magnetic recording and playback apparatus as set forth in claim 1, wherein said selecting means and said first and second channel recording heads alternately form a first track and a second track, and after the second track being formed by said second channel recording head, said first track is traced by said first channel playback head whereby said selecting means outputting the signal therefrom.
Claim 5
Dependent Claim
69 words
A magnetic recording and playback apparatus as set forth in claim 3, wherein said first and second channel playback heads are angularly shifted by a fraction from 90 degrees respectively toward said first and second channel recording heads, so that said first channle playback head comes to contact exactly a starting edge of the first track immediately after the second track is formed by the second channel recording head.
Claim 6
Dependent Claim
43 words
A magnetic recording and playback apparatus as set forth in claim 1, wherein a gap width of each of said first and second channel recording heads and said first and second channel playback heads is 1.5 times the track pitch of said tracks.
Claim 7
Dependent Claim
196 words
A magnetic recording and playback apparatus as set forth in claim 1, wherein said selecting means comprises first terminal means to which said recording signal is supplied; second terminal means for outputting a reproduced signal; a changeover timing generator circuit coupled to said first terminal means responsive to a recording and playback discrimination signal, a channel discrimination signal, and a recording signal to switch and control the operation timings by which respective heads record and reproduce said recording signal onto and from said medium; a recording head changeover switch for selecting said first channel recording head and said second channel recording head on the basis of a first output from said generator circuit; first amplifier means for amplifying said recording signal to be supplied to said first and second channel recording heads; second amplifier means for amplifying reproduced signals from said first and second channel playback heads; a playback head changeover switch for selecting said first channel playback head and said second channel playback head on the basis of a second output from said generator circuit thereby said reproduced signals from said first and second channel playback heads are selectively outputted to said second terminal means.
Claim 8
Dependent Claim
230 words
A magnetic recording and playback apparatus as set forth in claim 6, wherein said changeover timing generator circuit comprises a first NOT circuit for sending a NOT output of a recording and playback discrimination signal input thereto; a second NOT circuit for sending a NOT output of a channel discrimination signal for discriminating between first and second channels input thereto; a first logic circuit for receiving the recording signal from said first terminal means and an output from said first NOT circuit to perform an operation of logical product thereof for passing said recording signal to said recording head changeover switch in a recording mode; a second logic circuit for receiving outputs from said first and second NOT circuits to perform an operation of logical product thereof to send an output of high or low level for operating said recording changeover switch thereby said recording signal is selectively supplied to said first and second channel recording heads in a recording mode, and a third logic circuit for receiving said recording and playback discrimination signal and said output from said second NOT circuit to perform an operation of logical product thereof to send an output of high or low level for operating said playback head changeover switch so that playback signals from said first and second channel playback heads are selectively supplied to said second terminal means in a playback mode.
References Cited (Backward Citations)
No citation records indexed.
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