JPH10214460A - Digital signal recording and reproducing device and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To record a digital signal with an arbitrary data rate by arbitrarily selecting numbers of revolution of heads and a tape running speed or the like and to reproduce the digital signal by making the state of a device the same as that at the time of recording in one set of the device. SOLUTION: A digital signal is recorded with a predetermined wavelength by arbitrarily selecting the number of revolution (r) of a rotary drum (rotary head), a tape running speed (v), a recording rate (d) and the number of used rotary heads (n) and also information indicating the combination of (r, v, d, n) are recorded in the subcode area in the same track as main data. At the time of reproduction, numbers of revolution of rotary heads 1a-1d, the running speed of a magnetic tape 2, the number of heads, the sampling clock frequency of a waveform equalizer 7 and the center frequency of a VCO(voltage controlled oscillator) being in a PLL 11 or the like are controlled to the same states as those at the time of recording by detecting the information indicating the combination with a mode detecting decoder 15 and by generating control signals based on the detected information.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital signal recording / reproducing apparatus and a recording medium, and more particularly to a digital signal recording / reproducing apparatus for recording an information signal in a digital signal form on a recording medium in data block units and reproducing the same. And a recording medium.

[0002]

2. Description of the Related Art Conventionally, an information signal in the form of a digital signal is recorded by sequentially forming tracks on a magnetic tape by a rotary head, and a recorded digital signal is reproduced from a recorded track by using the rotary head. Digital V
TR is known. In this digital VTR, during normal playback, a recorded digital signal is reproduced from a recorded track on a magnetic tape running at the same running speed as during recording by using a rotating head that rotates at the same rotation speed as during recording. After the reproduced signal is amplified by a preamplifier,
The reproduced digital signal whose waveform is shaped by A / D conversion by the D converter is taken out, the waveform is equalized by the waveform equalizer, and data is identified using the clock signal extracted by the phase locked loop (PLL) circuit. .

In this case, the number of rotations of the head and the tape running speed at the time of recording and during normal reproduction are conventionally determined to have certain values. This is because if the number of rotations of the head or the tape running speed differs between recording and reproduction, the frequency band of the reproduction signal (reproduction signal data rate) differs from that during recording, and the above-mentioned waveform equalization is performed according to the reproduction signal frequency band. This is because it is necessary to change the frequency characteristics of the device, the oscillation frequency of the oscillator in the PLL, the sampling clock of the A / D converter, and the like, and cannot follow them as they are. Therefore,
Conventionally, information indicating the number of rotations of the head or the tape running speed during recording is not recorded on a magnetic tape, but is recorded at a predetermined specific value. Playback is performed at the running speed. this is,
The same applies to a digital signal recording / reproducing apparatus that records and reproduces digital signals on an optical disk or a magnetic disk without being limited to a digital VTR.

[0004]

However, if the number of rotations of the head and the tape running speed at the time of recording can be varied by one device, the use of recording and reproduction is widened and desirable. For example, when high quality image quality is strictly required, or when an image signal is to be recorded / reproduced at a high quality, the data amount per unit time (data rate) is increased and recorded / reproduced. When long-term recording / reproducing is required, those requirements can be met by lowering the data amount (data rate) per unit time for recording / reproducing.

Therefore, conventionally, in the case of a VTR, there has been known an apparatus which can selectively perform recording and reproduction in a standard time mode and recording and reproduction in a long time mode in which recording and reproduction can be performed for a long time, for example, three times the standard time. I have. In this device, whether it was recorded in standard time mode or long time mode,
At the time of reproduction, the discrimination is made based on the control pulse period recorded on the control track along the longitudinal direction of the magnetic tape. However, in the case of performing recording / reproduction that is not much different from the standard time mode, such as 1.25 times the standard time mode, the control pulse cycle according to the above-described conventional method uses the control pulse cycle. Cannot be discriminated because the difference is small.

On the other hand, taking a digital VTR as an example, the rotational speed of the head is r (rpm), the running speed of the magnetic tape is v (mm / s), the recording rate is d (Mbps), and the number of rotating heads used Is n, (r, v, d,
n) = (1800, 16.675, 14.1, 2). However, conventionally, the reproduction data rate of the reproduction processing circuit of one digital VTR is fixed and the parameters (r, v, d, n) at the time of recording cannot be determined.
Using the same mechanism, (2r, 2v, 2d, n) and (1.
25r, 2.5v, 2.5d, 2n) cannot be recorded and reproduced at various data rates in various combinations.

As described above, conventionally, a dedicated system is used for recording / reproducing signals of different data rates due to the difficulty in reproducing signal processing for data rate changes and for responding to changes in head rotation speed and tape running speed. At present, a single device records a digital signal at an arbitrary data rate by arbitrarily selecting a head rotation speed, a tape running speed, and the like, and reproduces the digital signal in the same manner as when recording. I couldn't do that.

[0008] The present invention has been made in view of the above points,
An object of the present invention is to provide a digital signal recording / reproducing apparatus and a recording medium which can record a digital signal at an arbitrary data rate by one device and reproduce the digital signal in the same state as at the time of recording.

[0009]

In order to achieve the above object, the present invention provides a method of forming a digital signal by sequentially forming tracks composed of a plurality of data blocks on a recording medium using a head. In a digital signal recording / reproducing apparatus that reproduces a digital signal recorded on a recording medium using the same or different head as at the time of recording, and restores an information signal through a reproduction signal processing circuit, A recording means for arbitrarily setting a speed, a recording data rate, and the number of heads to be used, and recording the setting information on the same track as a digital signal on a recording medium at a predetermined substantially constant recording wavelength; At the start, the speed of the head and the recording medium, the recording data rate,
A reproducing means for setting the number of heads to be used to one predetermined condition capable of reproducing a digital signal having a substantially constant recording wavelength, and detecting setting information from a reproducing signal of a recording medium, and detecting the detected setting. According to a control signal generated based on the information, the speed of the head and the recording medium and the number of heads to be used are made substantially the same as those at the time of recording, and control means for controlling the operation of the reproduction signal processing circuit is provided.

According to the present invention, a digital signal is recorded on a recording medium by arbitrarily setting the speed of the head and the recording medium, the recording data rate, and the number of heads to be used, and reproduced from the same track as the digital signal during reproduction. Detecting the setting information, generating a control signal based on the detected setting information, making the speeds of the head and the recording medium and the number of heads to be used substantially the same as those at the time of recording by the control signal. Since the operation is controlled, a single device can always reproduce a digital signal under almost the same conditions as during recording.

Here, when the recording medium is a tape-shaped recording medium which runs while being obliquely wound around a predetermined angle range on a rotary drum using a rotary head provided on the rotary drum, The number of rotations, the traveling speed of the tape-shaped recording medium, the recording data rate, and the number of rotating heads used can be set arbitrarily to record and reproduce digital signals.
Digital signals can be recorded and reproduced by arbitrarily setting the relative speed of the head and the disk-shaped recording medium, the recording data rate, and the number of heads to be used.

Here, the reproduced signal processing circuit includes a waveform equalizer for equalizing the waveform of the reproduced signal based on a sampling clock, a detector for binarizing the reproduced signal output from the waveform equalizer, A phase locked loop circuit that reproduces a clock signal from an output signal of the detector, and a discriminator that discriminates an output signal of the detector by an output reproduced clock signal of the phase locked loop circuit to obtain reproduced data. A control unit for detecting setting information from output reproduction data of the discriminator, controlling a rotation of a rotary drum to which the rotary head is attached based on a detected value of a rotation number of the rotary head, and a tape. Control signal for controlling the number of revolutions of the capstan motor for moving the tape-shaped recording medium based on the detected value of the traveling speed of the recording medium, and the detected value of the recording data rate A third control signal for controlling the frequency of the sampling clock supplied to the waveform equalizer, controlling the center frequency of the voltage controlled oscillator in the phase locked loop circuit, and a detected value of the number of rotary heads to be used. , And a fourth control signal for controlling a switch circuit for selecting a reproduction signal of the rotary head, respectively, and outputs the generated signal.

Further, according to the present invention, the setting information is recorded in a subcode area in which a subcode as auxiliary information is recorded, which is different from a main data recording area as main information of a digital signal. Since the information in the subcode area can be reproduced even when the reproduction state is relatively poor, the setting information can be reproduced even when the speed of the head or the recording medium is unknown.

Further, in the recording medium of the present invention, the information signal converted into a digital signal is recorded by sequentially forming a track composed of a plurality of data blocks, and at least the speed or the speed of the reproducing head itself is recorded in the track. Since the setting information for allowing the reproducing apparatus to identify the relative speed with respect to the reproducing head, the recording data rate, and the number of heads to be used at the time of reproduction is recorded at a predetermined and substantially constant recording wavelength, the time of recording at the time of reproduction is reduced. Can be played under the same conditions.

[0015]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of a reproducing system of a digital signal recording / reproducing apparatus according to the present invention. In this embodiment, a first rotary head 1 having a first azimuth angle provided 180 degrees opposite to a rotary drum as a rotary body is provided.
a and a second rotary head 1b having a second azimuth angle;
A third rotating head 1c having a second azimuth angle provided on the rotating drum in proximity to the first rotating head 1a to form a pair head; and a third rotating head 1c 180 degrees opposite to the third rotating head 1c. The first and second rotary heads 1a and 1b of the fourth rotary head 1d having the first azimuth angle are provided and form a pair head with the second rotary head 1b, or the first to fourth rotary heads are used. Rotating heads 1a-1
A helical scan system in which a digital information signal is recorded and reproduced in data block units on a magnetic tape 2 which is wound obliquely over an outer peripheral side surface of a rotary drum over an angle range of about 180 degrees and travels at a constant speed using d. VTR
Applied to

The digital information signal includes, for example, main data as main information and auxiliary data called a pack (data). Here, the pack includes a cassette ID, a time code, a recording date and time, source information (for example, a channel and a program index number when a digital broadcast signal is recorded), text data (for example, a title for each program, an outline, and the like), and the like. This is fixed-length data containing auxiliary information and its identification information.

The above-mentioned pack is recorded on the magnetic tape 2 together with main data and subcode data on each inclined track. Each inclined track is configured by arranging a plurality of fixed-area data areas called sync blocks corresponding to data blocks in accordance with scanning by the rotary heads 1a to 1d. FIG. 2 shows an example format of this sync block. As shown in the figure, the sync block stores an area 21 of a 2-byte synchronization signal (Sync) for reproducing the sync block, an area 22 of 3-byte address information (ID), and various information 3. A byte header storage area 23, a 96-byte substantial data storage area 24, and an 8-byte parity area 25 for error correction of the information of the sync block are combined in a time-series manner, for a total of 112 bytes. It is a byte configuration.

FIG. 3 shows an example of a track format of an inclined track on the magnetic tape 2 reproduced according to an embodiment of the present invention. As shown in the figure, one track includes a margin area 31, a preamble area 32, a subcode area 33, a postamble area 34, an IBG area 35, a preamble area 36, a main data area 37,
It comprises an error correction code area 38, a postamble area 39 and a margin area 40, and is composed of a total of 356 sync blocks.

Of the main data area 37 and the error correction code area 38, the main data area 37 is set to, for example, 306 sync blocks which are multiples of 6 sync blocks.
The error correction code area 38 is an area where an outer code (C2 code) for error correction is recorded, and is composed of 30 sync blocks. The subcode area 33 includes four sync blocks (= 448 bytes), and each sync block includes four subcode sync blocks 41 each having 28 bytes (= 28 symbols).

As shown in FIG. 4, one subcode sync block 41 has a two-symbol synchronization signal (Sync) area 43 and one-symbol address information (ID0, ID0).
Areas 44 and 45 of D1) and address information ID0 and ID
One symbol area 46 of ID parity (IDP) for identifying one error, an area 47 of one symbol of format ID, an area 48 of subcode data of 18 symbols, and error detection of this subcode sync block And a 4-symbol parity area 49. One symbol is one byte. The subcode data recorded in the area 48 is auxiliary information such as the title of the recorded content, the recording date and time, the time, and the absolute address on the tape. In the embodiment of the present invention, information indicating the combination of the above (r, v, d, n) is recorded in the subcode sync block 41.

More specifically, in the area 47 of one symbol of the format ID in the subcode sync block 41, the block size of the error correction code (ECC) recorded in the area 38 of FIG. E per truck
The CC block number, the program number, and the number of rotations of the rotating drum are recorded, and one symbol area 4 of the format ID in another subcode sync block 41 of the same track.
7, a recording mode and the like are recorded.

Normally, the information on the number of revolutions of the rotating drum is recorded in 2 bits, and the information on the recording mode is recorded in 4 bits. Here, by using a total of 6 bits, the above (r, v, d) is used. , N) is recorded. For example, "000000" is (r, v, d,
n) = (1800, 16.675, 14.1, 2), and "010
000 "is (r, v, d, n) = (2250, 33.35, 35.2
It is decided in advance so as to mean 5,5).

As another method, when the number of rotations of the 2-bit rotary drum is "11", the subcode data area 48
(R, v, d, n) may be individually defined. As is clear from these, (r, v,
It is not necessary to record all the elements of d, n) as information. For example, only the number of rotations r of the rotating drum (rotating head) may be recorded, and the other elements v, d, and n may be uniquely determined from r.

In addition, only (r, n) is recorded, and (v,
d) can be made to correspond. If all the above 6 bits are used, ²⁶ modes can be set, and 3 modes out of 6 bits can be used to set 8 modes. The point is that any combination of elements can be determined.

Further, in this embodiment, (r,
Regardless of the value of the information indicating the combination of (v, d, n), the wavelength of the digital signal recorded on the magnetic tape 2 is always recorded at a substantially constant value. That is, recording is performed so as to satisfy the following condition.

[0027]

(Equation 1) As described above, in this embodiment, the number of rotations r of the rotating drum (rotating head), the tape running speed v, the recording rate d, and the number of used rotating heads n are arbitrarily set and the digital signal is shown in FIGS. In the format shown, and (1)
As shown in the formula, while recording at a predetermined wavelength, in the subcode area 33 of the same track as the main data,
Information indicating the combination of (r, v, d, n) is recorded.

Next, the magnetic tape recorded as described above
1 will be described with reference to FIG. Recorded
When playing the magnetic tape 2 for the first time, the rotating drum
(Rotating head) rotation speed r, tape running speed v, recording
The information on the number d and the number n of rotating heads used is unknown.
Thus, one combination (r, v, d, n) = (r₁, V₁, D₁, N ₁) Play back in (2). That is, at the start of tape playback,
A drum motor in which a drum servo circuit 16 rotates a rotary drum.
Data is set to the initial setting r₁To rotate the rotary head 1a ~
The rotation speed of 1d is r₁And the capstan servo circuit 17
Starts the capstan motor that drives the magnetic tape 2
Rotate the tape at the set number of revolutions and set the tape running speed to₁And then
Initial switching (HSW) pulse generation circuit 5
Generates a fixed HSW pulse and supplies it to the switch circuit 4
And the number of rotating heads used is n₁And

Thus, the rotating heads 1a to 1d sequentially start scanning the recording tracks on the recorded magnetic tape 2. At this time, in some cases, even if the recording trace of the recording track does not match the scanning trajectory of the rotary heads 1a to 1d, and it is impossible to scan the entire recording track, the subcode sync block 41 is usually used. One or more tracks are always recorded on one track, and consideration is made so that data can be extracted even in a state where the reproduction state is relatively poor so as to sufficiently cope with high-speed tape feed reproduction. Therefore, the subcode area 3 which is a part of the track
The recording subcode sync block 41 of No. 3 can be reproduced relatively easily.

The reproduced signals from the rotary heads 1a, 1b, 1c and 1d are pre-amplified by preamplifiers 3a, 3b, 3c and 3d via a rotary transformer (not shown), and then supplied to a switch circuit 4. In HS
The HSW pulses from W pulse generating circuit 5, _one n (n ₁ In this example, 4 or less) only the reproduction signal of the rotational head is taken out in a time-series synthesized are selected, A /
It is supplied to the D converter 6. The A / D converter 6 A / D converts the input reproduction signal based on the sampling clock output from the sampling clock generation circuit 8 and supplies a waveform-reformed digital signal to the waveform equalizer 7.

The waveform equalizer 7 equalizes the waveform of the input reproduced digital signal by a known method based on the sampling clock output from the sampling clock generating circuit 8. Here, the sampling clock output from the sampling clock generating circuit 8 to the A / D converter 6 and the waveform equalizer 7 is a clock having a frequency that satisfies the expression (2) and is at least twice the upper limit frequency of the recording signal. In the initial state, the digital signal of the recording rate d ₁ is A / D converted,
In addition, the clock has a frequency that can be equalized in waveform.

The reproduced digital signal output from the waveform equalizer 7 is compared with a predetermined threshold value in a detector 9 to be converted into a binary signal.
Each is supplied to the circuit 11. The PLL circuit 11 is adapted to control the center oscillation frequency of an internal voltage controlled oscillator (VCO) by the speed information voltage from the speed information voltage generation circuit 12, and the recording rate d _{1 in the} initial state.
The center oscillation frequency is controlled so that a clock signal in the digital signal can be extracted from the digital signal. The reproduced clock signal output from the PLL circuit 11 is supplied to the discriminator 10, where the reproduced signal from the detector 9 is latched to identify the data.

The identification data output from the identifier 10 and P
The reproduction clock signal output from the LL circuit 11 is supplied to a synchronization signal detection circuit 13 where a synchronization signal having a known fixed pattern is detected, and the error correction circuit 14 corrects the error using an error detection code in the reproduction data. Is restored to correct data, and is processed as valid data in a subsequent processing circuit (not shown).
While being output to the mode detection decoder 15.

The mode detection decoder 15 detects the value of the data of the subcode sync block from the input data.
Therefore, when the subcode area 33 is reproduced shortly after the reproduction of the recorded magnetic tape 2 is started, information indicating the combination of (r, v, d, n) recorded by the mode detection decoder 15 is detected. Is done.

The mode detection decoder 15 generates a first control signal based on the detection drum (head) rotation speed r based on the detected information and supplies the first control signal to the drum servo circuit 16 to control the drum motor inside the drum servo circuit 16. Is the detected rotational speed r
Drive control to be equal to
Is generated and supplied to the capstan servo circuit 17 so that the rotation speed of the capstan motor in the motor is held between the capstan and the pulley (neither is shown). The running speed of the magnetic tape 2 is controlled to be equal to the detected tape running speed v.

The mode detection decoder 15 detects the
Recording rate d Generating a third control signal based on
Ring clock generation circuit 8 and speed information voltage generation circuit 1
2 and output the sampling clock
Clock frequency and speed information voltage at the detection recording rate d.
Control to a value suitable for digital signal reproduction, and detection rotation
Generating a fourth control signal based on the head use number n;
Supply to HSW pulse generation circuit 5 to generate HSW pulse
Controls the number and phase of the output HSW pulses of the circuit 5 to detect
You can select the playback signal of the number n of rotating heads
So that

The above-described drum servo circuit 16 and capstan servo circuit 17 are each of a known configuration, and are feedback loop circuits for controlling the driving of the drum motor and the capstan motor at a constant rotational speed and a constant phase. In order to control the rotation speed of the drum motor or the capstan motor as described above, for example, the FG pulse having a repetition frequency corresponding to the rotation speed of the motor is compared with the frequency of a reference signal, and the frequency difference is determined according to the frequency difference. The frequency detection circuit that outputs the speed error signal may be configured so that the reference signal can be variably controlled by the first and second control signals.

FIG. 5 is a block diagram showing an example of the sampling clock generating circuit 8. As shown in the figure, the sampling clock generation circuit 8 includes a clock oscillator 51 that oscillates and outputs a clock pulse having a constant repetition frequency, and a clock pulse from the clock oscillator 51 that is 1/1.
Frequency divider 52 that divides frequency by 0, frequency divider 53 that divides frequency by 1/8, 1
A frequency divider 54 that divides by / 5, a frequency divider 55 that divides by １ ／,
The selector 56 is configured to select any one of the frequency dividers 52 to 55 based on an external input control signal (the third control signal) and output the selected signal as a sampling clock.

Here, assuming that the repetition frequency of the output clock pulse of the clock oscillator 51 is, for example, 270 MHz, the output pulse frequency of the frequency divider 52 is 27 MHz, the output pulse frequency of the frequency divider 53 is 33.75 MHz, and the frequency divider 54 Is 54 MHz, and the output pulse frequency of the frequency divider 55 is 67.5 MHz. r = 1800
When 27 MHz is the sampling clock at the time of rpm, r is sequentially set to 2250 rpm, 3600 rpm, and 450 by the output pulses of the frequency dividers 53, 54, and 55.
A signal having a data rate ratio at 0 rpm can be processed by the output sampling clock of the selector 56.

As described above, according to this embodiment, digital signals of various data rates can be reproduced in the same state as at the time of recording. For this reason, one recording / reproducing apparatus can perform recording / reproducing for various uses depending on which of the image quality and the recording / reproducing time is prioritized.

Next, a second embodiment of the present invention will be described. In this embodiment, a digital VTR having three modes in one unit is assumed. The block configuration itself is the same as in FIG. 1, but the information of (r, v, d, n) is stored in the following table. The feature is that it is set as shown in FIG.

[0042]

[Table 1] In Table 1, d is indicated by the channel rate. For example, in mode 3, 300 tracks per second (= 45 tracks)
00 ÷ 60 × 4) is formed.
As shown in FIG. 6, 356 sync blocks (ie, 3
Since 56 × 112 × 8 bits are recorded, the recording rate d is 95.69280 (= 356 × 112 × 8 × 30).
0 ÷ 10 ⁶ ) Mbps.

If the sampling clock in mode 1 is 27 MHz, which is higher than the data rate at that time of 19.13856 Mbps, in mode 2, twice as many rotating heads as in mode 1 are used. Since the data rate 23.9232 (= 47.84640 / 2) Mbps is 1.25 times that of mode 1, 33.75 MHz, which is 1.25 times 27 MHz, is used as the sampling clock. In mode 3, the number of rotating heads is twice as large as that in mode 1, so that the data rate per channel is 47.8464.
(= 95.69280 / 2) 67.5 MHz (5
4 MHz may be used as a sampling clock.

In this embodiment, the digital signal is recorded so that d / (rn) becomes almost 536.3 in any of the modes 1 to 3 so as to satisfy the expression (1), and r And v are fixedly determined, so that the 2-bit rotating drum arranged in the one symbol area 47 of the format ID in the subcode sync block 41 described in the first embodiment is used. (Mode 1, Mode 2, Mode 3) =
It is recorded as (00,01,10). These are equivalent to recording the number of rotations of the rotating drum on a magnetic tape.

At the time of reproduction, first, reproduction of the digital signal recorded on the recorded magnetic tape is started in the mode 1, and the information of the number of rotations of the 2-bit rotating drum reproduced from the subcode area is, for example, If "10" is detected, the mode 3 shown in Table 1 at that time is used.
, The drum rotation speed r to 4500 rpm, the tape running speed v to 83.36 mm / s, the number of rotating heads n used during reproduction to 4, and the sampling clock to 67.5 MH.
The circuit is switched so as to operate in each of z.

Thus, as described with reference to FIG.
The recorded signal can be reproduced under the same conditions as during recording. Therefore, the second embodiment also has the same features as the first embodiment.

Next, a third embodiment of the present invention will be described. This embodiment is characterized in that the circuit unit having the block configuration shown in FIG. 6 is used as a circuit unit including the A / D converter 6, the waveform equalizer 7, and the sampling clock generation circuit 8 shown in FIG. Having. That is, in FIG. 6, the reproduced signal output from the switch circuit 4 shown in FIG. 1 is directly supplied to the electronic filter type analog waveform equalizer 61, and the reproduced signal from the mode detection decoder 15 shown in FIG. And a selector 62 for receiving a control signal, selecting one of n different voltages V1 to Vn set in advance, and supplying the selected voltage to the electronic filter type analog waveform equalizer 61 as a control voltage. .

In this embodiment, a control signal generated according to the information of the recording rate d detected by the mode detection decoder 15 shown in FIG.
A voltage most suitable for the detection recording rate d is selected from V1 to Vn. Thus, the electronic filter type waveform equalizer 61 equalizes the waveform of the reproduction signal from the switch circuit 4 with equalization characteristics according to the voltage selected by the selector 62. That is, the electronic filter type waveform equalizer 61 performs the waveform equalization most suitable for the data rate of the reproduction signal.

In the above embodiment, a digital VTR has been described as an example. However, the present invention is not limited to this. For example, a digital signal is recorded and reproduced on a disk-shaped recording medium such as an optical disk or a magnetic disk. The present invention can also be applied to a recording / reproducing apparatus that performs the above. in this case,
The rotational speed r of the rotary drum (rotating head) and the tape running speed v are represented by a relative speed between the head and the recording medium, and a plurality of modes having different relative speeds are set. The digital signal is recorded so that the recording wavelength is constant even when the recording is performed.

The sampling clock supplied to the A / D converter 6 and the waveform equalizer 7 is generated separately from the clock obtained by the PLL 11.
The data extraction bit clock obtained by the LL 11 can also be used as the sampling clock of the A / D converter 6 and the waveform equalizer 7. In this case, the sampling clock generation circuit 8 becomes unnecessary, so that the circuit configuration can be more inexpensive and simplified.

[0051]

As described above, according to the present invention,
A digital signal is recorded on the recording medium at a substantially constant recording wavelength by arbitrarily setting the speed of the head and the recording medium, the recording data rate, and the number of heads to be used, and at the time of reproduction, reproduction is performed from the same track as the digital signal. Information is detected, a control signal is generated based on the detected setting information, and the speed of the head and the recording medium and the number of heads used are made substantially the same as at the time of recording by the control signal, and the operation of the reproduction signal processing circuit is performed. , The digital signal can always be reproduced by one device under almost the same conditions as at the time of recording, so that the values of the speed of the head and the recording medium, the number of heads used, and the recording data rate are different. Various modes of recording / reproduction can be performed by one recording / reproduction device, and each device does not require a dedicated device. Can.

Further, according to the present invention, when recording a digital signal on a tape-shaped recording medium or a disk-shaped recording medium, the selection as to which of the quality of the digital signal to be recorded and reproduced and the recording and reproducing time is prioritized is made as described above. Since the speed of the head and the recording medium, the number of heads to be used, and the recording data rate can be arbitrarily set, it can be made finer than before, so that recording and reproduction corresponding to various uses can be performed as compared with the past.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of a reproducing system of a digital signal recording / reproducing apparatus according to the present invention.

FIG. 2 is a diagram illustrating an example of a format of a sync block of a digital signal recorded and reproduced according to an embodiment of the present invention.

FIG. 3 is a diagram showing an example of a format of a track recorded and reproduced according to an embodiment of the present invention.

FIG. 4 is a diagram showing an example of a format of a subcode sync block in a subcode area in FIG. 3;

FIG. 5 is a block diagram of an example of a sampling clock generation circuit in FIG. 1;

FIG. 6 is a block diagram of another embodiment of a main part of the digital signal recording / reproducing apparatus according to the present invention.

[Explanation of symbols]

 1a to 1d Rotating head 2 Magnetic tape 4 Switch circuit 5 Head switching (HSW) pulse generating circuit 6 A / D converter 7 Waveform equalizer 8 Sampling clock generating circuit 10 Discriminator 11 Phase locked loop (PLL) circuit 12 Speed information Voltage generation circuit 15 Mode detection decoder 16 Drum servo circuit 17 Capstan servo circuit 33 Subcode area 41 Subcode sync block 51 Clock oscillator 52 to 55 Divider 56, 62 Selector 61 Electronic filter type analog waveform equalizer

Claims (7)

[Claims] An information signal converted into a digital signal is recorded by sequentially forming tracks composed of a plurality of data blocks on a recording medium by using a head, and recording is performed by using the same or another head at the time of recording. In a digital signal recording and reproducing apparatus for reproducing the digital signal recorded on a recording medium and restoring the information signal through a reproduction signal processing circuit, the speed of the head and the recording medium, the recording data rate, and the number of heads to be used are determined. A recording means for arbitrarily setting and recording the setting information on the same track as the digital signal on a recording medium at a predetermined substantially constant recording wavelength; and at the start of reproduction of the recording medium, the speed of the head and the recording medium. , A recording data rate, and the number of heads to be used are determined by a predetermined condition capable of reproducing the digital signal having the substantially constant recording wavelength. A reproducing means for setting and reproducing the information, and detecting the setting information from a reproduced signal of the recording medium, and controlling the speed of the head and the recording medium and the number of heads to be used by a control signal generated based on the detected setting information. And a control unit for controlling the operation of the reproduction signal processing circuit. 2. Using a rotary head provided on a rotary drum, a plurality of information signals converted into digital signals on a tape-shaped recording medium running while being obliquely wound around the rotary drum over a predetermined angle range. Tracks composed of data blocks are sequentially formed and recorded, and the digital signal recorded on the tape-shaped recording medium is reproduced by using the same or different rotary head as at the time of recording, and the information is passed through a reproduction signal processing circuit. In a digital signal recording / reproducing apparatus for restoring a signal, the number of rotations of the rotary head, the traveling speed of the tape-shaped recording medium, the recording data rate, and the number of rotary heads to be used are arbitrarily set, and the setting information is transmitted to the digital signal. Recording means for recording on the tape-shaped recording medium at a predetermined substantially constant recording wavelength on the same track as the tape-shaped recording medium; At the start of the reproduction of the recording medium, the number of rotations of the rotary head and the traveling speed of the tape-shaped recording medium, the recording data rate, and the number of rotary heads to be used are set to one of predetermined predetermined values capable of reproducing the digital signal having the substantially constant recording wavelength. A reproducing means for setting and reproducing the condition; detecting the setting information from a reproduction signal of the tape-shaped recording medium; a control signal generated based on the detected setting information; A digital signal recording / reproducing apparatus, comprising: a control unit for controlling the operation of the reproduction signal processing circuit while making the traveling speed of the linear recording medium and the number of rotating heads to be used substantially the same as during recording. 3. The recording means sets d / (r · n) (where d is the recording data rate, r is the number of rotations of the rotary head, and n is the number of the rotary heads used) substantially constant. The digital signal recording / reproducing apparatus according to claim 2, wherein the digital signal and the setting information are recorded on the tape-shaped recording medium so as to perform the recording. 4. A reproduction signal processing circuit comprising: a waveform equalizer configured to equalize a waveform of the reproduction signal based on a sampling clock; a detector configured to binarize the reproduction signal output from the waveform equalizer; At least a phase locked loop circuit for reproducing a clock signal from an output signal of the detector, and a discriminator for recognizing an output signal of the detector by an output reproduced clock signal of the phase locked loop circuit to obtain reproduced data. A control unit configured to detect the setting information from output reproduction data of the discriminator, and to control rotation of a rotary drum to which the rotary head is attached based on a detected value of a rotation speed of the rotary head; A second control signal for controlling a rotation speed of a capstan motor for running the tape-shaped recording medium based on a control signal and a detected value of a running speed of the tape-shaped recording medium. A third control for determining a frequency of a sampling clock supplied to the waveform equalizer based on the detected value of the recording data rate, and controlling a center frequency of a voltage-controlled oscillator in the phase locked loop circuit. And generating and outputting a fourth control signal for controlling a switch circuit for selecting a reproduction signal of the rotary head based on a detection value of the number of the rotary heads to be used. 3. A digital signal recording / reproducing apparatus according to claim 2. 5. The apparatus according to claim 1, wherein the setting information is recorded in a subcode area in which a subcode as auxiliary information is recorded, which is different from a main data recording area as main information of the digital signal. Item 3. A digital signal recording / reproducing apparatus according to Item 2. 6. A disk-shaped recording medium on which information signals converted into digital signals are formed by sequentially forming tracks composed of a plurality of data blocks, and recorded using the same or different head as that used for recording. In a digital signal recording / reproducing apparatus for reproducing the digital signal recorded on a recording medium and restoring the information signal through a reproduction signal processing circuit, a relative speed between the head and a disk-shaped recording medium, a recording data rate, and a head to be used Recording means for setting the number arbitrarily, and recording the setting information on the same track as the digital signal at a predetermined substantially constant recording wavelength on the disc-shaped recording medium, at the time of starting reproduction of the disc-shaped recording medium, The relative speed of the head and the disc-shaped recording medium, the recording data rate and the number of A reproducing unit that sets and reproduces the digital signal of the recording wavelength under a predetermined condition capable of reproducing the digital signal; and a control unit that detects the setting information from the reproduction signal of the disc-shaped recording medium and generates the control information based on the detected setting information. Control means for controlling the relative speed between the head and the disk-shaped recording medium, the number of heads to be used, and the number of heads to be used by recording a signal, and controlling the operation of the reproduction signal processing circuit. Recording and playback device. 7. A digital information signal is formed by sequentially forming a track composed of a plurality of data blocks and recorded, and at least the speed of the reproducing head itself or the relative speed to the reproducing head is recorded in the track. A recording medium, wherein setting information for causing a reproducing apparatus to identify a speed, a recording data rate, and the number of heads to be used for reproduction is recorded at a predetermined substantially constant recording wavelength.