EP0661876A2
Expired / Lapsed
EP
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Digital signal recording
Assignee: Sony Corp
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Filing: 1994-12-21
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Granted: —
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Expires: 2014-12-21
Abstract
Abstract An input digital signal is recorded as inclined tracks on a magnetic tape by rotating heads. The full length (L) of the tape is nearly divided by four in the longitudinal direction. A leading portion (L / 4) of the beginning of the tape is a general data recording area and the remainder is a continuous data recording area (Fig. 9). General data and continuous data are recorded as SYNC blocks. The number of SYNC blocks for one track of the general data is the same as that of the continuous data. By dividing the SYNC blocks of one track, a basic unit of general data is formed. The basic unit is divided into sub-units. The data construction of the sub-unit is the same as that of audio data recorded in an audio data area of one track. A rate detecting circuit (43) determines rate information, representing the data rate of input data, which is supplied to a mechanism controller (45). The controller (45) controls a buffer memory (46), a frame segmenting circuit (48), and a tape head mechanism (20) in correspondence with the data rate information. For example, the number of rotations of a drum on which a rotating head is disposed and the tape travel speed are decreased in correspondence with the ratio for the case in which standard data is recorded. Thus, data at a lower data rate than that of standard data can be recorded on the tape with the same track format as that used when standard data is recorded.
Inventors
- 👤 Yukio C/O Intellectual Property Div. Kubota
- 👤 Hajime C/O Intellectual Property Div. Inoue
- 👤 Keiji C/O Intellectual Property Div. Kanota
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 15:28
CPC Classifications
G; G11; G11B; G11B20/00; G11B20/10; G11B20/12; G11B20/1201; G11B20/1207; G11B20/1209; H; H04; H04N; H04N7/00; H04N7/10; G11B15/00; G11B15/02; G11B15/05; G11B15/087; G11B15/18; G11B15/1808; G11B15/1875; G11B15/20; G11B15/46; G11B15/467; G11B15/4671; G11B15/4673; G11B20/1217; G11B20/1254; G11B27/00; G11B27/10; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B27/3063; H04N9/00; H04N9/79; H04N9/80; H04N9/804; H04N9/8042; H04N9/8047; H04N5/00; H04N5/76; H04N5/78; H04N5/782; H04N5/7824; H04N5/7826; H04N5/78263; H04N5/78266; H04N5/783; H04N9/806; H04N9/8063; H04N9/82; H04N9/8205; H04N9/87
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
159 words
A digital signal recording method for inputting both continuous data such as video data and audio data and general data such as a computer program that is non-continuous data and for recording an input digital signal on a tape-shaped recording medium, comprising the steps of: determining that the input digital signal is the general data, determining a general data recording area that is at least one of a leading portion and a trailing portion, the leading portion extending from the leading edge of the tape-shaped recording medium for a predetermined length, the trailing portion extending to the trailing edge of the tape-shaped recording medium for a predetermined length, and storing the general data in the general data recording area; and determining that the input digital signal is the continuous signal, determining a continuous data recording area other than the general data recording area of the tape-shaped recording medium, and recording the continuous data in the continuous data recording area.
Claim 2
Dependent Claim
244 words
A digital signal recording apparatus, comprising: a first signal process path for inputting both continuous data such as video data and audio data and general data such as a computer program that is non-continuous, demodulating and decoding the input digital signal, and outputting the decoded signal to an output device; a second signal process path disposed downstream of demodulating means of said first signal process path and adapted for modulating the demodulated signal, encoding the modulated signal with error correction code, and causing tape head means to record the decoded data to tape-shaped recording medium; data determining means for determining whether the input digital signal is the general data or the continuous data; and control means for determining a general data recording area that is at least one of a leading portion and a trailing portion, the leading portion extending from the leading edge of the tape-shaped recording medium for a predetermined length, the trailing portion extending to the trailing edge of the tape-shaped recording medium for a predetermined length, and recording the general data in the general data recording area when said data determining means has determined that the input digital signal is the continuous data and for determining a continuous data recording area other than the general data recording area of the tape-shaped recording medium and recording the continuous data in the continuous data recording area when said data determining means has determined that the input digital signal is the continuous signal.
Claim 3
Dependent Claim
97 words
The digital signal recording apparatus as set forth in claim 2, wherein said tape head means is a rotating head for recording the digital signal as inclined tracks on the tape-shaped recording medium, the digital signal being composed of SYNC blocks with a predetermined length, and wherein the general data is recorded in such a manner that the number of the SYNC blocks contained in one of tracks in which the continuous digital signal is recorded is divided into an integer number of basic units and that additional data is placed in each of the basic units.
Claim 4
Dependent Claim
108 words
The digital signal recording apparatus as set forth in claim 2, wherein said tape head means is a rotating head for recording the digital signal as inclined tracks on the tape-shaped recording medium, the digital signal being composed of SYNC blocks with a predetermined length, and wherein the general data is recorded in such a manner that the number of the SYNC blocks contained in one of tracks in which the continuous digital signal is recorded is divided into an integer number of basic units and the basic units are divided into an integer number of sub-units and that additional data is placed in each of the sub-units.
Claim 5
Dependent Claim
123 words
The digital signal recording apparatus as set forth in claim 2, wherein said tape head means is a rotating head for recording the digital signal as inclined tracks on the tape-shaped recording medium, the digital signal being composed of SYNC blocks with a predetermined length, and wherein the general data is recorded in such a manner that the number of the SYNC blocks contained in one of tracks in which the continuous digital signal is recorded is divided into an integer number of basic units and the basic units are divided into an integer number of sub-units and that additional data is placed in each of the sub-units and the general data is recorded in an audio data recording area of the tracks.
Claim 6
Dependent Claim
29 words
The digital signal recording apparatus as set forth in claim 2, wherein a guard area is formed between the general data recording area and the continuous data recording area.
Claim 7
Dependent Claim
132 words
A terminal apparatus for a digital image communication, comprising: a first signal process path for demodulating and decoding a received signal and sending the resultant signal to an output device; a second signal process path disposed downstream of demodulating means of said first signal process circuit and adapted for modulating the demodulated signal, performing error correction code decoding therefor, and recording the encoded signal on a magnetic medium; data rate detecting means for detecting data rate of a digital signal supplied from said first signal process path to said second signal process path; and control means for controlling a recording operation corresponding to the data rate being detected by said data rate detecting means so that a track format on the recording medium almost accords with that at a standard data rate.
Claim 8
Dependent Claim
60 words
The terminal apparatus as set forth in claim 7, wherein said second signal process path includes a recording mechanism that comprises a rotating head and a tape, and wherein said control means is adapted for decreasing both the number of rotations of the rotating head and a feed speed of the tape corresponding to the data rate to be recorded.
Claim 9
Dependent Claim
98 words
The terminal unit as set forth in claim 7, wherein said second signal process path includes a recording mechanism that comprises a rotating head and a tape, and wherein said control means is adapted for causing the number of rotations of the rotating head to be equal to that in the case that data at standard data rate is recorded and for decreasing the feed speed of the tape corresponding to the ratio of data rate of data to be recorded against the standard data rate so as to intermittently record data corresponding to the data rate ratio.
Claim 10
Dependent Claim
99 words
The terminal apparatus as set forth in claim 7, wherein said second signal process path includes a recording mechanism that comprises a rotating head and a tape, and wherein said control means is adapted for intermittently feeding the tape, causing the feed speed of the tape and the number of rotations of the rotating head to be equal to those in the case that data at standard data rate is recorded, and controlling durations of a tape feed period and a tape stop period corresponding to ratio of data rate of data to be recorded against standard data rate.
Claim 11
Dependent Claim
71 words
The terminal apparatus as set forth in claim 7, wherein the received data is data in which image data of a plurality of program channels has been time-division multiplexed as packets that are composed a predetermined number of bytes, the data rate of each of the program channels varying, the received data containing rate information that is the average value or the maximum value of data rate of each program channel.
Claim 12
Dependent Claim
117 words
A terminal apparatus, comprising: a first signal process path for demodulating and decoding a received signal and sending the resultant signal to an output device; a second signal process path disposed downstream of demodulating means of said first signal process circuit and adapted for modulating the demodulated signal, performing error correction code decoding therefor, and recording the encoded signal on a magnetic medium; and means for inputting data in which image data of a plurality of program channels has been time-division multiplexed as packets that are composed of a predetermined number of bytes to said first signal process path and selectively recording data of a predetermined program channel of the time-division multiplexed data to the recording medium.
Claim 13
Dependent Claim
110 words
A terminal apparatus, comprising: a first signal process path for demodulating and decoding a received signal and sending the resultant signal to an output device; a second signal process path disposed downstream of demodulating means of said first signal process circuit and adapted for modulating the demodulated signal, performing error correction code decoding therefor, and recording the encoded signal on a magnetic medium; and coupling means for inputting data in which image data of a plurality of program channels has been time-division multiplexed as packets that are composed of a predetermined number of bytes to said first signal process path and recording the time-division multiplexed data to the recording medium.
Claim 14
Dependent Claim
50 words
The terminal apparatus as set forth in claim 7, 12 or 13, wherein image data of the program channels has been time-division multiplexed, data of each of the program channels being encoded, after the received data has been decoded, the decoded data being supplied to said second signal process path.
Claim 15
Dependent Claim
59 words
The terminal apparatus as set forth in claim 7, 12, or 13, wherein one broadcasting channel contains data in which image data of a plurality of channels has been time-division multiplexed, each broadcasting channel having been encoded by the same technique, after the encoded data has been decoded, the decoded data being supplied to said second signal process path.
Claim 16
Dependent Claim
27 words
The terminal apparatus as set forth in claim 7, 12, or 13, wherein said first signal process path and said second signal process path are integrally constructed.
Claim 17
Dependent Claim
27 words
The terminal apparatus as set forth in claim 7, 12, or 13, wherein said first signal process path and said second signal process path are separately constructed.
References Cited (Backward Citations)
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