Patent EP0593214A2 successfully refreshed from Google Patents.
EP0593214A2
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Method and apparatus for multichannel recording and reproducing
Assignee: Sony Corp
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Filing: 1993-10-07
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Granted: —
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Expires: 2013-10-07
Abstract
Abstract In a magnetic recording and/or reproducing apparatus, when the reproduced audio data is processed in the reproduction system and the record system and is re-recorded in every cycle of N times the cycle during which the reproducing magnetic head scans a pair of recording tracks, the recording magnetic head is positioned behind the reproducing magnetic head for 8.5 + 4N track pitch so that the reproduced audio data can be re-recorded on the original recording track, therefore a write-after-read processing can be realized. Further, in the recording magnetic head positioned behind the reproducing magnetic head for the specific track pitch, the audio data is stored in a memory circuit for time base compression or expansion with a multichannel mode such as to record the reproduced audio data at the same part on the magnetic tape, so that a magnetic recording and/or reproducing apparatus which enables to perform the write-after-read processing can be obtained with simple construction if the number of channel is switched. Furthermore, the 2 n channel audio data is recorded by interleave processing in every cycle of N times the cycle forming a pair of recording tracks, so that even when the cycle during which a pair of recording track is formed is not kept to a multiple of integer of sampling cycle, a magnetic recording apparatus and a magnetic recording and/or reproducing apparatus which record and reproduce a plurality of channel audio data can be provided.
Inventors
- 👤 Yoshiyuki Kunito
- 👤 Tadashi Fukami
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 06:05
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/10527; G11B27/00; G11B27/02; G11B15/00; G11B15/02; G11B15/12; G11B15/125; G11B27/031; G11B27/032; G11B27/036; G11B5/00; G11B5/008; G11B5/00813; G11B5/00847; G11B5/0086; G11B5/48; G11B5/52; G11B5/53; G11B5/531; G11B5/534; G11B20/00007; G11B20/12; G11B20/1201; G11B20/1211; G11B20/18; G11B2020/10537; G11B2020/10546; G11B2020/10592; G11B2020/1087; G11B2220/00; G11B2220/90; G11B2220/91; G11B2220/913
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
224 words
A magnetic recording and/or reproducing apparatus for recording audio data by helically sequentially forming a pair of recording tracks with plus and minus azimuth angles on tape, said magnetic recording and/or reproducing apparatus comprising: a rotary drum being wound to a magnetic tape; a pair of reproducing magnetic heads positioned on said rotary drum; a reproducing signal processing means which reproduces a pair of recording tracks in a pair of said reproducing magnetic heads, performs an error correction for said reproduced signal and outputs the reproduced signal which is interleave processed; a storing means for combining to said reproducing signal processing means; a recording signal forming means for performing interleave processing for the signal from said storing means, performing the error correction for the signal, and converting into recording signal; and a recording magnetic head positioned on said rotary drum for recording the recording signal from said recording signal forming means on said magnetic tape, and wherein: said storing means modulates the reproduced signal outputted from said reproducing signal processing means into the 2 n channel reproduced signal and outputs them, and then compresses said outputted 2 n channel reproduced signal on the time axis with a following N frame cycle and outputs them again; said recording magnetic head is positioned behind said reproducing magnetic head for at least 8.5 + 4N track pitch.
Claim 2
Dependent Claim
31 words
A recording and/or reproducing apparatus according to claim 1, wherein: said recording magnetic head is positioned behind said reproducing magnetic head for at least 12.5 track pitch when N = 1.
Claim 3
Dependent Claim
35 words
A recording and/or reproducing apparatus according to claim 1 or 2, wherein: a sampling frequency and the number of channel in said recording and/or reproducing apparatus are either 44.1 [kHz] 4-channel or 48 [kHz] 4-channel.
Claim 4
Dependent Claim
31 words
A recording and/or reproducing apparatus according to claim 1, wherein: said recording magnetic head is positioned behind said reproducing magnetic head for at least 16.5 track pitch when N = 2.
Claim 5
Dependent Claim
34 words
A recording and/or reproducing apparatus according to claim 4, wherein: a sampling frequency and the number of channel in said recording/reproducing apparatus are either 44.1 [kHz] 4-channel, 48 [kHz] 4-channel or 32 [kHz] 8-channel.
Claim 6
Dependent Claim
79 words
A recording and/or reproducing apparatus according to any one of claims 1 to 5, wherein: when the track length on said magnetic tape is "L", the track angle is "φ", the distance between scan starting terms of recording track is "n", and the angle from reproducing magnetic head to corresponding recording magnetic head is "x", "x" is represented by the formula: (90° = 90[degree]; x = multiplex symbol) x = 90° × (1 - m L × tanφ )
Claim 7
Dependent Claim
72 words
A recording and/or reproducing apparatus according to any one of the preceding claims, further comprising: a channel number switching means; and a timing generator for controlling write and/or read of data to and/or from said storing means, and a recording and/or reproducing apparatus wherein write and/or read of data to and/or from the storing means is controlled by said timing generator in accordance with the operation of said channel number switching means.
Claim 8
Dependent Claim
30 words
A recording and/or reproducing apparatus according to claim 7, wherein: said recording magnetic head of recording and/or reproducing apparatus is positioned behind the reproducing magnetic head for 16.5 track pitch.
Claim 9
Dependent Claim
37 words
A recording and/or reproducing apparatus according to claim 7 or 8, wherein: said channel switching means switches the channel from 44.1 [kHz] 4-channel mode, 48 [kHz] 4-channel mode, or 32 [kHz] 8-channel mode into usual 2-channel mode.
Claim 10
Dependent Claim
31 words
A recording/reproducing apparatus according to claim 9, wherein: said timing generator controls to delay the write and/or read data to and/or from said storing means for each term of 2 frame.
Claim 11
Dependent Claim
36 words
A recording and/or reproducing apparatus according to claim 9, wherein: said channel switching means switches the channel from 44.1 [kHz] 4-channel mode, 48 [kHz] 4-channel mode or 32 [kHz] 8-channel mode into 32 [kHz] 4-channel mode.
Claim 12
Dependent Claim
38 words
A recording and/or reproducing apparatus according to any one of claims 7 to 11, wherein: said timing generator controls to delay the write and/or read data to and/or from said storing means for each term of 1 frame.
Claim 13
Dependent Claim
196 words
A recording and/or reproducing apparatus, comprising: a rotary drum being wound with a magnetic tape; a pair of reproducing magnetic head and a pair of recording head positioned on said rotary drum; a reproducing signal processing means which reproduces a pair of recording tracks in a pair of said reproducing magnetic heads, performs the error correction for said reproduced signal and outputs the reproduced signal which is interleave processed; a storing means for performing de-interleave processing for a reproduced signal outputted from said reproducing signal processing means into 2 n channel reproduced signal with N frame cycle; an input means for inputting 2 n channel signal; a storing means for performing sampling processing for inputted said 2 n channel signal with sampling frequency f s , and performing interleave process for each said 2-channel signal with N frame cycle so as to output them; a recording signal forming means for performing interleave processing for the signal outputted, performing the error correction for the signal, and converting into recording signal; and a recording magnetic head which is positioned on said rotary drum for recording the recording signal from said recording signal forming means on said magnetic tape.
Claim 14
Dependent Claim
91 words
A recording and/or reproducing apparatus according to claim 13, wherein one of the following relations is satisfied:- N = 1, n = 2, f s = 44.1 [kHz]; or N = 1, n = 2, f s = 48 [kHz] ; or N = 1, n = 2, f s = 44.1 [kHz]; or N = 2, n = 2 , f s = 44.1 [kHz]; or N = 2, n = 2 , f s = 48 [kHz]; or N = 2, n = 3, f s = 32 [kHz].
References Cited (Backward Citations)
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