JPH0235648A - Reproducing device - Google Patents

Abstract

PURPOSE:To prevent an effect of cross talk from an adjacent recording track by making a main data reproducing head trace based on a pilot signal to be read by a pilot signal reading head which scans a recording track in advance. CONSTITUTION:The same recording track is scanned by the pilot signal reading heads W1 and W2, each head width being wider than the width of the recording track, prior to the main data reproducing heads R1 and R2, each head width being the same as the track width. Then, the pilot signal for a tracking control is read from a recording track adjacent to this track, and the tracking control is constituted to be carried out in order to make the main data reproducing heads R1 and R2 trace accurately on the recording track based on the pilot signal. By this method, the main data reproducing heads R1 and R2 scan without protruding into the adjacent recording track, so that a reproducing signal is not influenced by any cross talk from the adjacent recording track.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a reproducing device that can be used in a rotary head type magnetic recording and reproducing device.

BACKGROUND OF THE INVENTION Conventional rotary head type magnetic recording and reproducing devices have two recording heads that serve as a recording head for recording data on a magnetic tape and a reproducing head for reading data recorded on a magnetic tape. The reproduction heads are provided at a distance from each other on the circumferential surface of the rotating drum, and the azimuth of these two recording/reproduction heads (the relative angle of the gap when used as a recording head and the gap when used as a reproduction head) ) are different from each other.

Data is recorded on a magnetic tape by alternately scanning the magnetic tape in its width direction using two recording/reproducing heads. The format of the recorded data is determined so that data for two adjacent recording tracks recorded by two recording/reproducing heads are handled as one block.

The head width of the two recording/reproducing heads is wider than the recording track width, so during playback, the recording/reproducing head scans the recording track where the data to be reproduced is recorded, and the head width is wider than the recording track width. ATF recorded in the adjacent recording track (＾uto Tra
ck (Finding) signal (signal for correctly tracing the recording/reproducing head on the recording track). The detected ATF signal is fed back to the capstan motor control system that controls the running of the magnetic tape, and this adjusts the running speed of the magnetic tape so that the recording/reproducing head accurately traces the recording track to be scanned. is lll1#f.

Problems to be Solved by the Invention As mentioned above, in the conventional rotary head type magnetic recording/reproducing device, the head width of the recording/reproducing head is wider than the recording track width, so that the recording track to be scanned is [・Racking control is performed based on the ATF signal read from the recording track adjacent to the recording track, but the head width of the recording/reproducing head is t! ) - being wider than the rack width means that noise is mixed into the reproduced signal due to crosstalk from adjacent recording tracks. This phenomenon can be explained by two records as mentioned above.
It is unavoidable that the azimuth differs between the reproduction and reproduction heads.

Therefore, an object of the present invention is to suppress the influence of crosstalk from adjacent recording tracks and improve tracking performance.
The object of the present invention is to provide a playback device that can perform the following.

Means for Solving the Problems The present invention provides a system in which a plurality of adjacent recording tracks are arranged on the circumferential surface of a rotating drum that is rotated and driven to rotate in contact with the recording team 1 so as to coincide with the running of a recording tape on which a plurality of adjacent recording tracks are lined up. The recording tape is provided in layers and has the same width as the recording l/rack width, and alternately scans and records adjacent recording tracks of the recording tape.Two main data playback systems read the main data recorded on the rack. a main data reproducing head having a width wider than the recording track width and provided on the circumferential surface of the rotating drum in correspondence with each of the main data reproducing heads, the main data reproducing head scans the same recording track as the main data reproducing head; Two pilot signal reading heads scan before the data reproducing head and read pilot signals for tracking control recorded on adjacent recording tracks, and based on the pilot signals read by the pilot signal reading heads, , controlling the running speed of the recording tape and the rotational speed of the rotary drum to correctly trace the main data reproducing head on the recording track +wtn
This is a reproduction device characterized by comprising means.

According to the present invention for ftE, a pilot signal for tracking control is read from a recording track adjacent to the recording track being scanned by the Paikatsu Toy No. 3 reading head that scans the recording track prior to the main data reproducing head, and the pilot signal for tracking control is read from the recording track adjacent to the recording track being scanned. The means controls the running speed of the recording tape and the rotational speed of the rotary drum based on the read pilot signal to cause the main data reproducing head to correctly trace the recording track. Since the head width of the main data reproducing head is the same as the recording track width, noise due to crosstalk is not mixed into the signal read and reproduced by the main data reproducing head.

Embodiment FIG. 1 shows a rotation 7 which is an embodiment of the reproducing apparatus of the present invention.
In block number 0, which describes the configuration of a digital audio tape recorder, an analog-to-digital conversion circuit 1 is a circuit for converting an analog signal of music or other recording input to be recorded into a digital signal. It is.

The operation keys 2 are keys for inputting commands such as recording, playback, fast forward, and rewind, and subcode data, and are connected to the system control circuit 3. This system control circuit 3 is a circuit for controlling the timing of data exchange in each circuit section, and includes a display circuit 4, a signal processing control circuit 5. It is connected to a subcode signal generation/decoding circuit 1'l6 and a servo control circuit 7, respectively.

The display circuit 4 is a circuit for displaying the input subcode data, and the subcode signal generation/decoding circuit 6 adds a parity code to the input subcode data, sets the order of data, etc. This is a circuit for

The signal processing control circuit 5 and the subcode signal generation/decoding circuit 6 are connected to each other, and the signal processing control circuit n5 is further connected to the signal processing circuit 8 and the modulation/demodulation circuit 9.
It is connected to the.

The signal processing circuit 8 includes a modulation/demodulation circuit 9, an analog-to-digital conversion circuit 1, and a digital-to-analog conversion IA circuit. 10 and a memory 11. The modulation/demodulation circuit 9 is connected to one recording amplifier 12, two reproduction amplifiers 13 and 14, and the servo control circuit 7 described above.

The rotating drum 15 is for recording data on the magnetic chip 116 and for reading the data recorded on the magnetic chip 116. On the outer periphery of the rotating drum 15, a recording head for recording data and a data recording head are provided. A pair of recording and reproducing heads wl and w2 that also serve as reading and reproducing heads.
are provided at 180 degrees in circumferential angle.

Separately, on the outer periphery of the rotating drum 15, there are a pair of read-only heads RI R2 that only remove data, and a pair of recording/playback heads W1. They are provided in association with W2.

That is, if the rotational direction of the rotary drum 15 is R in the first eye, then in the group of the recording/reproduction head W1 and the reproduction-only head R1, the rotation direction R1-W is set in the rotational direction R.
They are arranged in the order of R2→W2 in the group consisting of the recording/reproduction-purpose RAD W2 and the reproducing-only RAD R2.

The magnetic chip 116 is wound around the outer peripheral surface of the rotary drum 15 over a constant circumferential angle, and as the magnetic chip 116 travels and the rotary drum 15 rotates, adjacent recording tracks are aligned on the magnetic tape 16 as shown in FIG. 18 is alternately shared between a group of the recording/reproducing head W1 and a reproducing head R1, and a group of a recording/reproducing head W2 and a reproducing head R2.

Further, the head width of each recording/reproducing head Wl, W2 is wider than the width of the recording track 18 described above, and during reproduction, the recording track 1 adjacent to the rack 18 is scanned.
It is used to read the ATF signal, which is a pilot signal for tracking control, recorded in 8. These recording/reproducing heads Wl, W2 are connected to the aforementioned recording amplifier 12 and one of the reproducing amplifiers 13.

On the other hand, the head width of each read-only head R1, R2 is set to be the same as the width of the recording track 18, and is connected to the other read amplification 314.

In the first section, the drive mechanism 17 includes a drum motor that rotationally drives the rotary drum 15, a capstan motor that drives the magnetic data 16, and the like.

Next, the operation of the digital audio tape recorder described above will be explained separately into recording operation and reproduction operation.

(1) IL, L When a recording input such as music, which is an analog signal, is given to the analog-to-digital conversion circuit 1, the signal is converted into a digital signal, that is, p CM (1'ulseCode
ModuLatio+) signal. The converted digital signal is subjected to signal processing such as adding a parity code for error correction in the next signal processing circuit 8, and then stored in the memory 11.

On the other hand, from the operation ear key 2 to the system control 1-roll circuit 3
subcode data such as time information and track number information input to the ATF output from the system control circuit 3.
The signal undergoes signal processing such as addition of a parity code and ordering in the sag code signal generation/signal circuit 6, and is sent to the signal processing circuit 8 via the next signal processing control circuit 5.

In this signal processing circuit 8, the PCM signal stored in the memory 11, the subcode data and the ATF signal sent from the signal processing control circuit 5 are converted into predetermined signals for each recording track 18. The signals are arranged in a format and sent to the modulation/demodulation circuit 9. In the modulation/demodulation circuit 9, the sent signal is transmitted to the recording/reproducing heads Wl, W2.
8-10 modulation processing is performed to convert the recording signal to a recording signal with a number of bits corresponding to the rotation timing of the
edLoop) signal etc. is added to the next recording amplifier 12.
sent to. The signal amplified by the recording amplifier 12 is recorded on the magnetic tape 16 by the recording/reproducing heads Wl, W2 of the rotating drum 15.

(2) - [The data recorded on the magnetic chip 116 is transferred to the rotating drum 15.
The data are read by the respective recording/reproducing heads Wl and W2 and the respective reproducing heads R1 and R2. In the reading operation, when the group of the recording/reproducing head W1 and the read-only head R1 scans one recording track 18, the recording/reproducing head W1 scans the adjacent recording track 18.
Two head groups scan adjacent recording track 1, such that the read-only head group 2 and read-only head R2 scan.
This is done by scanning 8 parts alternately.

At this time, as shown in FIG. 2, the recording track 18 scanned by the read-only head R1 is previously scanned by the recording/reproducing head W1, and similarly the recording track 18 scanned by the read-only head R2 is Prior to this, scanning is performed by the recording/reproducing head W2. The reproduced signals read by the preceding recording/reproducing heads Wl and W2 are amplified by one of the reproducing amplifiers 13 and sent to the modulation/demodulation circuit 9.

As mentioned earlier, the head width of the recording/reproducing heads Wl, W2 is wider than the width of the recording track 18, so the reproduced signals read by the recording/reproducing heads Wl, W2 include these healds w1°W2. AT recorded on the recording track 18 adjacent to the recording track 18 being scanned
The F signal is also included. In the modulation/demodulation circuit 9, the 8-
A conversion inverse to the 10 modulation is performed, whereby the reproduced signal is demodulated into data before recording.

The ATF signal is extracted from the data string adjusted for one ship,
This ATP signal is sent to the servo control circuit 7. In the servo control circuit 7, the sent ATF
Control of the drive machine $1117 based on the signal, that is, magnetic chi 1
The running speed of the rotary drum 16 and the rotational speed of the rotary drum 15 are controlled, thereby performing tracking control so that the read-only heads R1 and R2 correctly trace the corresponding recording track 18. Hepto R1,R for reproduction only
As mentioned above, the head width of the head RI R2 is set to be the same as the width of the recording track 18, so the tracking control described above allows the read-only head RI R2 to not protrude from the corresponding recording track 18 into the adjacent recording track 18. Scanning is performed accurately.

On the other hand, the reproduced signals read by the reproduction-only heads R1 and R2 are amplified by another reproduction amplifier 14 and sent to the modulation/demodulation circuit 9. In the modulation/demodulation circuit 9, this i% modulation is also converted to the reverse of the 8-10 modulation during recording, and demodulated to the data before recording.

A PCM signal and a subcode signal are extracted from the demodulated data string, and these signals are sent to the signal processing circuit 8.

The PCM signal sent to the signal processing circuit 8 is temporarily stored in the memory 11.
Only the audio data of the PCM signal is sent to the digital-to-analog conversion circuit 10.

The signal converted into an analog signal by the digital-to-analog conversion circuit 10 is taken out as a reproduction output. This reproduction output is generated by the reproduction-only head R1 which scans the corresponding recording track 18 without overflowing into the adjacent recording track 18.
Since it corresponds to the reproduced signal read out by R2, noise due to crosstalk from the adjacent recording track 18 will not be mixed in.

Although the above embodiment has been described with reference to the case where the present invention is applied to a digital audio recorder having both a recording function and a playback function, the present invention can be similarly applied to a device having only a playback function.

Effects of the Invention As described above, according to the reproducing apparatus of the present invention, the pilot signal reading head whose head width is wider than the recording track width is used before the main data reproducing head whose head width is the same as the recording track width. The same recording track is scanned, a pilot signal for tracking MIJI is read from a recording track adjacent to the recording track, and tracking control is performed to correctly trace the main data reproducing head on the recording track based on the pilot signal. This structure prevents the main data reproducing head from scanning into adjacent recording tracks, and the reproduction signal from the main data reproducing head is not affected by crosstalk from adjacent recording tracks. There is no.

[Brief explanation of the drawing]

1st (2I) is a block diagram showing the configuration of a reproducing apparatus which is an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing the positional relationship of the head on the magnetic tape. 7... Servo control circuit; 15-... Rotating drum, 18... Recording track, Wl, W2... Recording.
Herad for reproduction (pilot signal reading headon, R)
L, R2...Reproduction-only head (main data reproduction head) Agent Patent attorney Number of strokes Keiichi

Claims (1)

[Claims] A plurality of adjacent recording tracks are provided on the circumferential surface of a rotating drum that is rotated in contact with the recording tape as the recording tape runs, and are spaced apart from each other and have a recording track width. two main data reproducing heads that have the same width and alternately scan adjacent recording tracks of the recording tape to read main data recorded on the recording tracks; and a head that has a width wider than the recording track width; The main data reproducing head is provided on the circumferential surface of the rotating drum in correspondence with each of the main data reproducing heads, and the main data reproducing head scans the same recording track prior to the main data reproducing head, and scans the same recording track as the main data reproducing head scans, and scans the adjacent recording track. Two pilot signal reading heads read the pilot signals for tracking control recorded on the controller, and based on the pilot signals read by these pilot signal reading heads, the running speed of the recording tape and the rotational speed of the rotating drum are controlled. and control means for correctly tracing the main data reproducing head on a recording track.