JPS61206974A - Data recording device - Google Patents

Abstract

PURPOSE:To realize the function to alterate a reproducing part without decreasing the quantity of main information and the quantity of additional information that can be recorded simultaneously by making (m) bits out of (n) bit data that indicate additional information area indicating data that indicate alteration of reproduced part and a reproduced area after alteration, and at the same time, using (l) bits that indicate the mode of recording in remaining (n-m) bit data as a destined address to be altered indicated by area indicating data. CONSTITUTION:(m) bits (m) is natural number less than (n) out of (n) bits data that indicate additional information are made for area indicating data that indicate alteration of reproduced part and reproduced area after alteration, and (l) bits [(l) is a natural number and l<=n-m] that indicate the mode of recording out of remaining (n-m) bit data are made for the address of alteration indicated by area indicating data. Thus, the mode of recording after alteration of reproduced part can be recorded without increasing the number of bits of additional information. Accordingly, the function to alterate a reproduced area can be realized without decreasing the quantity of main information.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a data recording device, and more particularly to a data recording device consisting of an n-bit data group representing main information for each of a plurality of areas extending in the longitudinal direction of a tape-shaped recording medium. first data;
The present invention relates to a data recording device that records second data including n-bit data indicating additional information for each area.

<Prior Art> Hereinafter, as this type of device, an audio signal as the main information is compressed in the time axis.

A multi-track digital audio tape recorder will be explained by taking as an example a multi-track digital audio tape recorder in which each of six channels extending in the longitudinal direction of a magnetic tape is digitally modulated and recorded independently using a rotary head.

FIG. 1 is a diagram showing an example of a tape running system of a conventional audio tape recorder of this type.

In Figure 1, 1 is a magnetic tape, 2 is a rotating head 3.4
It is a rotating cylinder that holds the With this, head 3
, 4 records the audio signal by diagonally tracing the tape 1, and each time the head 3.4 rotates by 36 degrees, time axis compression is applied to six areas formed in the longitudinal direction of the tape 1. By recording these audio signals, an audio-only tape recorder capable of recording a total of six channels of audio signals can be obtained.

In Figure 2, CHI to CH6 are traced by Head 3 or Head 4 respectively from A to B, B to C9C, D to E, E to F, and F to G in Figure 2. This is an area where audio signals are recorded during the period. It is possible to record audio signals separately in each area, and so-called azimuth overwriting is performed in each area, but the tracks in each area CHI to CH6 do not need to be on the same straight line, and each area Pilot signals for tracking control are recorded in each region, but it is assumed that they are recorded in a predetermined rotation (ft''fz→f3→fa) for each region, and there is no correlation between the regions.

Also, the area shown as CHI-CH3 is tape 1 in FIG.
If it is assumed that recording and reproduction are being performed when the vehicle is traveling at a predetermined speed in the direction shown by arrow 7, and recording and reproduction is being performed in the areas shown by CH4 to CH6 when it is also traveling in the direction shown by arrow 9, then As shown in FIG. 3, the inclination of each track in the area indicated by CHI to CH3 and the inclination of each track in the area indicated by CH4 to CH6 are slightly different. However, regarding the difference in relative speed at this time, compared to the difference due to the rotation of heads 3 and 4,
It is assumed that the damage caused by the running of the tape l is extremely small and therefore does not pose a problem.

FIG. 4 is a time chart of recording and reproduction of the tape recorder as described above. In FIG.
“High level (H)” and “low level (L)” every 0 seconds
It is a 30Hz square wave that repeats. Also, (b) is P
G It is a PC of opposite polarity to (a). Here, PC (a) is H, PG (
b) is assumed to be H while the head 4 similarly rotates from B to G.

Figure 4(c) shows the data reading pulse obtained from PG(a), which is used to sample the audio signal every other field for a period corresponding to one field (1/60 seconds) of the video signal. It is something. Figure 4(d) shows sampled l-field 1-minute audio data.
Adding redundant code for error correction using AM etc.
The signal processing period for changing the arrangement is indicated by H.

In FIG. 4(e), the data recording period is indicated by H, and the timing at which the recording data obtained by the above-mentioned signal processing is recorded on the tape 1 is indicated.

For example, if we follow the flow of the signal in time using Fig. 4, t
The data sampled during the period from 1 to t3 (while head 3 is moving from B to G) is from t3 to t5 (when head 3 is moving from G to A)
Signal processing is performed at t5 to t6 (head 3 is A-B)
recorded over a period of That is, the head 3 causes C in FIG.
Recorded in the HI area. On the other hand, data sampled while PG (b) is H is signal-processed at the same timing and recorded by the head 4 in areas C and Hl.

PG (a) at a predetermined phase (here, 36° for one region)
Phase shifted PGt - shown in Figure 4(f).

Hereinafter, a case will be described in which an audio signal is recorded using PG (f) and a PG (not shown) having the opposite characteristics.

The data sampled from t2 to t4 in Figure 4 is E4
The signal is processed according to the signal shown in FIG. 4(g) during the period from t6 to t6, and recorded according to the signal shown in FIG. 4(h) during the period from t6 to t7.

That is, data is recorded by the head 3 in the area indicated by CH2 in FIG. 3 during the period when the head 3 traces B-C. Similarly, data sampled during the period t4 to t7 is recorded by the head 4 in the area indicated by CH2.

Next, the operation of reproducing the signal recorded in the area indicated by CH2 will be explained.

The reading of data from the tape l by the head 3 is shown in FIG.
t6 to t7 (same for tl to t2) according to the signal shown in h)
t7 to t8 (
From t2 to t3), signal processing opposite to that during recording is performed. That is, error correction and the like are performed during this period, and a reproduced audio signal is output from t8 to t9 (t3 to t6) in accordance with the signal shown in FIG. 4(j). Of course, the reproduction operation by the head 4 is performed with a phase difference of 1800 degrees from the above-mentioned operation, and thus a continuous reproduction audio signal is obtained.

It goes without saying that for the other areas CH3 to CH6, PG(a) can be phased by nX36 degrees and the above-mentioned recording/reproducing operation can be performed based on this. Not dependent.

Next, an example of a data format conventionally used in the above-mentioned apparatus will be explained. FIG. 5 is a diagram showing an example of the data format recorded in one track of each area in FIG. 3, that is, the format of data containing PCM audio data corresponding to a two-channel audio signal of 1/60 seconds. .

In the data matrix shown in FIG. 5, the column indicated by 5ync is a synchronization data column, the column indicated by adregs is an address data column, the columns indicated by P and Q are redundant data columns for error correction, and the column indicated by CRCC is a well-known CRCC. The check code data strings DI and D2 each include a plurality of columns, and are data strings each containing two channels of audio signal information. On the other hand, b (o) to b (3x-1) respectively indicate each row of this data matrix, and each row is recorded sequentially from the left side to the right side in the figure as one data block. The Hnc column data of (0) is followed by the address column data of b (o), and then the next is b(0).
The two columns of data are recorded sequentially, and b
After the last column data of l), 5sync of b(fL+1)
Column data is recorded, and when the final column data of b(3x-1) is recorded, data recording for one track is completed.

Here, in the first column included in DI, b(0),
b(1), b(x), b(x+1).

6 data (ID
O to ID5) are data (hereinafter referred to as ID data) corresponding to additional information other than audio signal information.

In recent years, high-density data recording technology has been progressing in the field of recording digital information signals onto recording media. Along with this, even when recording the same information signal in the same data format, there is a considerable degree of freedom in the recording format on the recording medium.

Under these circumstances, devices with similar recording formats will co-exist, and taking into account compatibility between them, it is necessary to record information regarding this recording format on the recording medium in some form. is desirable,
In addition, with the trend toward higher density recording, it has become possible for the above-mentioned apparatus to record analog information signals for extremely long periods of time.

Along with this, it is desirable to record time information and program information in the same way.On the other hand, since information signals are recorded as digital data, information related to this recording format is also recorded as digital data with the same number of bits. It is also convenient in the sense that recording it as data does not interfere with high-density recording. The above-mentioned ID data is recorded based on these ideas.

(Problems to be Solved by the Invention) Incidentally, the multi-track digital audio tape recorder as described above can be provided with a function of recording or reproducing by changing tracks. This function is extremely useful as it allows continuous recording for long periods of time.

On the other hand, in order to realize this kind of function, it is necessary to set the recording end point of the track before the change, the track number after the change, the recording direction of the signal on that track, the recording start point, and the tape speed at the time of recording. It is necessary to record the data necessary for the change on the track before the change. However, in addition to this data, it is necessary to record a large amount of data on the track before the change, such as data such as the tape running speed and tape running direction at the time of recording, in order to play the track, and ID data. It was difficult to record when only a limited amount of data was given.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a data recording device that can realize a reproduction area changing function without reducing the amount of main information.

<Means for Solving the Problems> In view of the above-mentioned problems, in the present invention, m bits (m is a natural number less than n) of n-bit data indicating additional information are changed in the reproduced part and In addition to the bits indicating the recording mode in the remaining (n-m) bit data (fL is a natural number, sentence ≦n-
m) refers to the change destination indicated by the area instruction data.

<Operation> By doing as described above, it is possible to record the recording mode after changing the playback portion without increasing the number of additional information bits, so it is possible to realize the function of changing the playback area without reducing the amount of main information. It became like that.

<Embodiment> FIG. 5 is a diagram showing a schematic configuration of a tape recorder as an embodiment in which the present invention is applied to the tape recorder as described above. W similar to Figures 2 to 3 in Figure 6
Components are given the same number.

PG obtained from the rotation detector 11 of the rotating cylinder 2 is supplied to the cylinder motor control circuit 16, which rotates the cylinder 2 at a predetermined rotational speed and a predetermined rotational phase. 12.
13 is the flywheel 1 of the capstan 14 and 15 respectively
7.18 rotation detectors, the outputs (FG) of which are alternatively supplied to a capstan motor control circuit 20 via a switch 19. The output of the circuit 20 is supplied to each capstan motor via a switch 21 so that the capstan 14 or 15 rotates at a predetermined speed during recording. Switches 19 and 21 are connected to the F side in the figure when the tape is run in the direction shown by arrow 7 (forward direction), and to the R side in the figure when the tape is made to run in the direction shown by arrow 9 (reverse direction).

By manually operating the operating section 24.

Operation modes such as recording and reproduction, and areas to be recorded and reproduced are specified. Also, do you want to record only audio?
It is also specified whether the video signal is to be recorded in the recording pattern shown in FIG. Further, the track pitch and tape running direction during recording are also specified using this operation section 24.

Furthermore, if you wish to change the playback track as described above,
The changed track number, tape running direction, and track pitch can also be specified using the operating section 24.

These data are supplied to the system controller 25, which controls the capstan motor control circuit 20, the switch 19.21, the area designation circuit 26,
It controls the gate circuit 27, ID signal control circuit 51, etc. Then, the area designation circuit 26 supplies the area designation data to the gate pulse generation circuit 23 to obtain a desired gate pulse. Incidentally, in the case where a video signal is also recorded, the designated area is naturally CHI.

The control gate pulses of the gate circuit 28 are determined based on the area designation data of the head 3. The aforementioned window pulses are selectively supplied to each of the heads 4.

During recording, the analog audio signal input from the terminal 29 is supplied to the PCM audio signal processing circuit 30, sampled at the aforementioned timing related to the window pulse, converted into digital data, and then subjected to the aforementioned signal processing. Ru.

In addition, the above-mentioned ID data is also generated together with this audio data. The recording audio data obtained in this way is sent from the pilot signal generation circuit 32 to f1 for each field.
→TP generated by rotation of f2 → f3 → f4
S and other pilot signals to be described later in an adder 33. The output of the adder 33 is appropriately gated by the gate circuit 28 as described above, and written into a desired area by the head 3.4.

During playback, the playback signals from the heads 3 and 4 are similarly extracted by the gate circuit 28 using window pulses, and this playback signal is passed through the A-side terminal of the switch 34 to the lobal filter (
LPF) 35 and the PCM audio circuit 30, in which signal processing such as error correction, time axis extension, and digital-to-analog conversion is performed in the opposite direction to recording, and the signal is reproduced. An analog audio signal is output from the terminal 36.

The LPF 35 separates the aforementioned TPS and supplies it to the ATF circuit 37. The ATF circuit 37 is a circuit for obtaining a tracking error signal using a well-known four-frequency method, and uses a reproduced tracking pilot signal and a pilot signal generated by the pilot signal generation circuit 32 in the same rotation as during recording. As is well known.

However, since a tracking error signal is obtained for each region, this is sampled and held. The tracking error signal thus obtained is supplied to the capstan motor control circuit 20, which controls the running of the tape 1 during playback via the capstans 14 and 15, thereby performing tracking control.

Next, the function of recording and reproducing video signals will be explained.

When the system controller 25 issues a command to record and reproduce a video signal, the area specifying circuit 26 forcibly specifies the CHI area and also switches the gate circuit 27 to the
Operate according to G.

The video signal inputted from the terminal 38 is converted into a signal form suitable for recording by the video signal processing circuit 39 and sent to the post-adder 40.
supplied to Then, the adder 40 adds the pilot signal obtained from the pilot signal generation circuit 32, and the signal is added to the pilot signal obtained from the pilot signal generation circuit 32, and then sent to the area CH2 by the head 3.4 via the gate circuit 27.
~CH6 is recorded. The recording operation of the PCM audio signal at this time is exactly the same as the recording operation described above for CHI.

During reproduction, the video signal picked up by the head 3.4 is converted into a continuous signal via the gate circuit 27. This continuous signal is supplied to a video signal processing circuit 39,
The original signal form is output from the terminal 41. Also,
The continuous signal obtained from the gate circuit 27 is supplied to the LPF 35 via the V-side terminal of the switch 34.

The LPF 35 continuously separates pilot signal components and supplies them to the ATF circuit 37. At this time, ATF circuit 3
The tracking error signal obtained from 7 does not need to be sampled and held.

It is supplied to the capstan motor control circuit 20 as it is. At this time, a PCM audio signal is also reproduced from the CHI area, and an analog audio reproduction signal is obtained from the terminal 36, but tracking control using the output signal of the gate circuit 28 is not performed.

The data shown in ID2 to ID4 will be explained below using FIG. 1 and FIGS. 7 to 8r14.

The 8-bit data indicated by IDO is data (main mode designation data) for suggesting what kind of information each data of ID2 to ID4 corresponds to.

It is assumed that each data of IDI to ID4 of each mode of mode 1 to mode 6 is data indicating the information shown in FIG. That is, in mode 1, ID1 to ID4 are time information as a tape counter, in mode 2, time information for each cut, and in mode 3. That of mode 4 shows time information,
Also, IDI~ID4 of mode 5 and ID2~ of mode 8
ID4 is time information for each program module, 101 of mode 6
-ID4 and ID2 to ID4 of mode 7 respectively indicate time information from the head of each tape.

Pro in the 7th cause, /No is the program number, Cut/N
o indicates the cut number, and File/No indicates the file number.

In addition, when considering a system that generally replaces data with all O data when a data error occurs, it is desirable to make it difficult for all O data to occur. , normal data and data with O-touge l reversed.

The information indicated by the 8-bit data indicated by Y in FIG. 7 is shown in FIG. 8. Y indicates the data of ID5 in each mode 1 to 7. The 0th bit of this data Y is 1. Indicates whether the item is valid or invalid. The second bit indicates the format of the audio signal, such as whether the audio information recorded in the two channels is monaural or stereo. The fourth bit indicates whether audio signal information or other information is to be recorded in the first channel and second channel corresponding sections, respectively. Also, the fifth. The sixth bit is data that becomes "1" at the recording start and end portions of the audio signal, and the seventh bit is data that becomes "1" when it is desired to prevent dubbing.

Next, ID data in mode 7 will be explained with reference to FIG. The mode 7 ID data is used in this type of device when recording and reproducing PCM audio signals in each of the six channels as described above. The mode 7 IDO is data indicating the mode 7 number, as shown in FIG.

IDI data is data that includes information regarding the recording format, and as shown in FIG. 1, includes the following information.

First of all, the first to third bits are 3-bit data that is a feature of this embodiment.1 During normal recording, it is "111", and when instructing to change the playback part, the playback track after the change is CH
This is 3-bit data indicating which one is I to CH6. Since this data is 3 bits, it can correspond to eight types of information. By the way, there are only 6 types of tracks to specify, so CHI, CH2, C) H3°CH
When specifying 4, CH5, and CH6, "100",
""oto", "110".

“001”, “101”, and “011” will be made to correspond. By doing this, if the second to fourth bits of the data that are uniquely replaced at the time of error detection are all "O" or all "1", these three bits can be used to distinguish them.

0th bit and 4th bit. The fifth bit is data indicating the recording mode. First, the θth bit is data indicating the running direction of the tape during recording, and in FIG. "1" corresponds to "1".

The data of the 4th and 5th bits are data indicating the tape running speed, that is, the track pitch at the time of recording, and can specify up to four types of track pitch.
” is the standard track pitch, “10” is the track pitch due to long-term recording (for example, tape speed is 1/2), “
01" and "11" correspond to the third and fourth track pitches.

By the way, the data indicating these recording modes is usually
That is, if the first to third bits of IDI are "Ill",
The recording mode of the portion where this ID data is recorded is shown. on the other hand.

If the first to third bits of IDI are data corresponding to any of CHI-cH6, the recording mode in the reproducing section after changing the reproducing portion is shown.

Next, the sixth to seventh bits will be explained when the first to third bits are 111''.

These are search data, which is data for so-called cueing, etc. 0For example, in FIG. 6, if the audio data input from the terminal 29 is silent for a predetermined period (for example, 2 seconds), the data shown as "11" for a predetermined period (for example, 1 second = 6
0 track) or more. Also, if the user wants to make a mark even in the middle of a piece of music so that it can be detected later, the user manually operates the operation section to generate a corresponding command from the system controller 25, and based on that command, "Ol" is set. Record for a predetermined period (for example, 1 second). In addition, "10" is recorded in other parts, that is, parts where audio signals are normally recorded. If this search system is not used, "00" is recorded.

The 6th bit when the 1st to 3rd bits instruct a change in the playback part. The seventh bit is data indicating the change location, and when this data is "Ol", it instructs to run the tape in the direction of arrow 7 to the end and start playback. Also, when it is "10", it instructs to run the tape in the direction of arrow 9 to the end and then start playback.
'', it is an instruction to immediately start playing the track indicated by the first to third bits.

Now, the track indicated by the first to third bits is the same as the track before the change in the playback part, and the sixth... If the 7th bit is set to "lO" and the Oth bit is set to "0", each track can be played back many times, so-called repeat playback.

Next, ID2 to ID4 will be explained.

ID2 is data indicating time information or minute information; the 0th to 3rd bits are 0 to 9 in the ones digit, and the 4th to 6th bits are 0 to 7 in the tens digit (0 to 7 in the case of minute information). 5) is assigned. Here, the 7th bit of ID2 is the 0th bit of ID2.
This is data indicating whether the 6th bit is hour information or minute information.

ID3 is data indicating seconds information, and the ones' digits 0 to 9 are assigned to the 0th to 3rd bits, and the tens's digits 0 to 5 are assigned to the 4th to 6th bits.

The seventh bit of ID3 is data indicating whether the time information based on ID3.4 is from the end of the tape or from the beginning of the music in the music number indicated by ID4, which will be described later.

ID4 is data indicating the music number or movement number (a number assigned by dividing each music into several parts) in each channel, and the 0th to 3rd bits are the 1's digits 0 to 9.゜10 for the 4th to 6th bits
The digits 0 to 7 are assigned. ID4 7th
The bits indicate whether the 0th to 3rd bits of ID4 indicate a music number or a movement number.

By adopting the data structure as described above, it is possible to record in the same data format both the recording manner of each track and the recording manner of the reproduction portion after changing the reproduction portion.

Therefore, the data reading system of the system controller 25 can be simplified. Further, 102 to ID4 are two-digit numerical data, and correspondingly, the IDI is also different data for every four bits, making it easy to share the system.

Finally, the recording of such ID data will be briefly explained.

FIG. 9 is a diagram showing a specific example of the PCM audio signal processing circuit in FIG. 6. In FIG. 9, 101 is a terminal to which the input analog audio signal input to the terminal 29 is supplied, and 102 is a terminal to which output data from the ID control circuit 51 is supplied. The parallel data supplied to the terminal 102 is supplied to the ID generation circuit 104, which generates serialized data at a predetermined timing.

On the other hand, an analog audio signal input to the terminal 101 is supplied to an analog-digital converter (A/D) 103. The A/D 103 samples the analog audio signal at a predetermined frequency, quantizes it, and supplies it to the data selector 105 as serial data at a predetermined timing. The data selector 105 selects I once every l field period.
ID data generation circuit 104 at the timing corresponding to DI.
The output of the A/D 103 is supplied to the RAM (Random Access Memory) 107, and the output of the A/D 103 is supplied to the RAM (Random Access Memory) 107 at other timings.
Supply to M107. In the RAM 107, the parity word (P,
Address data such as Q), CRCC, etc. obtained from the address controller 108 and data obtained from the data selector 105 described above are arranged so as to correspond to the data matrix shown in FIG. The time-base compressed data is supplied from the RAM 107 in the above-mentioned order to the modulation circuit 109, which performs digital modulation such as BPM (pie, phase, modulation), and then outputs it through the terminal 111. The digitally modulated audio signal output from the terminal 111 is supplied to the adder circuit 33 as described above.

Next, the operation during playback will be explained. A digital modulation signal sent to the terminal 112 via the gate circuit 28 is demodulated by the digital demodulator 113 and supplied to the RAM 115.

In the RAM 115, signal processing that is completely opposite to that in the RAM 107 is performed.

That is, the arrangement is changed based on the address data obtained from the address controller 114 and the synchronization data, and error correction is performed in the ECC 116. In addition, the resulting data in columns D1 and D2 are Output from RAM115, D/A (digital-analog converter) 1
17, is supplied to the data reading circuit 118.

D'-/A 117 restores the original analog audio signal and outputs it from terminal 36 in FIG. 6 via terminal 119. On the other hand, the data reading circuit 118 picks up the aforementioned ID data and supplies it to the ID detection circuit 52. It is assumed that the operations of each part of the signal processing circuit shown in FIG. 9 are all synchronized by a timing signal generated by the timing controller 110.

The ID detection circuit 52 supplies information as shown in FIGS. 1, 7, and 8 to the system controller 25 for ID data retrieval. According to these data, the system controller 25 controls the area designation circuit 26 and the capstan control circuit 20.

In the above embodiment, each data is 8-bit data,
Although the mode designation date 7 minutes is 1 bit and the numerical data is 2 digits, the present invention is not limited to this, and can be changed as appropriate within the scope of the claims, and the same effect can be obtained even if the changes are made.

Description of Effects> As explained above, according to the present invention, it is possible to obtain a data recording device that can realize the function of changing the reproduced portion without reducing the amount of main information and the amount of additional information that can be recorded simultaneously. can.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a data format in an apparatus as an embodiment of the present invention. Fig. 2 is a diagram showing the running system of a conventional tape recorder, Fig. 3 is a diagram showing the recording format of the recorder shown in Fig. 2, and Fig. 4 is a diagram showing the recording and playback timing of the recorder shown in Fig. 2. chart. FIG. 5 is a diagram showing a data matrix for explaining the recording data format by the recorder of this embodiment, FIG. 6 is a diagram showing a schematic configuration of a tape recorder as an embodiment of the present invention, FIGS. 8 is a diagram showing the additional information data format in the format of FIG. 5, and FIG. 9 is a diagram showing a specific example of the PCM audio signal processing circuit in FIG. 6. 1 is a magnetic head as a recording medium, 24 is an operation unit, 25
30 is a PCM audio signal processing circuit, 51 is an ID control circuit, DI and D2 are audio data strings as first data, and IDI is 8-bit data included in the second data.

Claims (1)

[Claims] First data consisting of a group of n-bit data indicating main information for each of a plurality of areas extending in the longitudinal direction of the tape-shaped recording medium, and second data including n-bit data indicating additional information for each area. A device for recording, wherein m bits (m is a natural number less than n) of the n-bit data indicating the additional information are used as area instruction data indicating a change in the playback portion and a playback area after the change, and remain (n-m
) A data recording device characterized in that l bit (l is a natural number, l≦nm) indicating a recording mode in the bit data corresponds to a change destination indicated by the area designation data.