JPH0713051Y2 - Multi-track long time recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a multi-track long-time recorder.

[Conventional technology]

In systems such as those for exchanging money with a telephone, the contents of a call are recorded and stored using a recorder for a long time in order to prove the transaction. This recorder is capable of recording all the contents of a day's conversation on one tape, and it is a multi-track recorder with as many tracks as the number of lines used, but the number of lines tends to increase. However, it is desired to increase the number of tracks per unit in order to reduce the cost. Currently, there are tape recorders with 32 to 64 tracks per inch, and some of them are operated in parallel to obtain the required number of tracks. It would be cost effective if the number could be increased.

[Problems to be solved by the device]

Increasing the number of tracks means reducing the width of the tracks, and if the head is displaced from the center of the track due to a slight meandering of the tape, a large level fluctuation will occur, so it is extremely important that the playback head correctly follow the tracks. It requires a mechanism for the tape to run with high precision.

[Means for Solving the Problems]

A means for recording a pilot signal of a constant cycle on a specific track, a means for detecting a change in reproduction output obtained from that track, a filter means for extracting a pilot signal from reproduction outputs obtained from adjacent tracks, and It has a means to detect the current position of the head from two playback outputs, a head mounted so as to be movable in the vertical direction and an actuator that moves the head, and controls by determining which state the current state is. The output is generated and applied to the actuator to automatically center the head on the track.

〔Example〕

FIG. 1 shows a block diagram of an embodiment of the present invention, and FIG. 2 shows an example of a tape format recorded. FIG. 3 shows a head tracking flowchart. 0 of tape 6
Voice is recorded on the n-1 track. For n tracks
Sine wave of 30~50H _Z is recorded as a pilot signal. Signal reproduced is recorded on the tape 6 is reproduced in 1 ₀ ~n each multi-track head is amplified by the amplifier 2 ₀ ~n. The pilot signal recorded on the tape 6 is reproduced by the head 1n and amplified by the amplifier 2n. On the other hand, the band-pass filter 3 which extracts only the pilot signal from the reproduction signal of the head 1n-1 of the adjacent track, from which the crosstalk component to the adjacent track n-1 is obtained. Bandpass filter 3 for CPU4 level change of pilot signal from amplifier 2n and crosstalk to adjacent track
3 is performed according to the flow chart shown in FIG. 3 to determine the driving direction of the actuator, and the actuator 5 is driven to move the head 1 to automatically track the normal track position.

According to the flow chart shown in FIG. 3, the track 0 in which the heads 10 to 1n are recorded on the tape 6 due to the meandering of the tape 6 is shown.
.., n, the reproduction output obtained from the heads 10 to 1n decreases. When the pilot signal is periodically recorded on the specific track n of the tape 6, the reproduction output of the head 1n corresponding to this track is sampled by the CPU 4 through the amplifier 2n and stored, and the difference from the previous value is stored. Obtained (S1), if it is reduced, the head 10 to 1n is the track 0 of tape 6
It means that you are moving away from the normal position of ~ n (S
2) Conversely, if it increases, it is approaching the normal position (S
8) is judged. Then, the CPU 10 outputs a control output for returning to the previous position (S4), judging that the position of the heads 10 to 1n at the time of the increase from the increase to the decrease (S3) is the center of the tracks 0 to n recorded on the tape 6. Adjacent head 1n− at this regular position
The CPU 4 stores the crosstalk level of the pilot signal extracted by the filter 3 through the amplifier 2n-1 from the signal reproduced at 1 as the crosstalk level at the normal position (S5). In (S3), the CPU 4 issues a control command to reverse the direction of movement as a control command when it is determined that the previous time is not the maximum value but continuously attenuated (S7). Further, in (S8), when it is determined that the current time is larger than the previous time and continuously increased, the control is continued in the same direction as the control command (S9), and the control command is continued up to the maximum value (S10).
Then, the CPU 4 commands the actuator 5 to maintain the previous maximum value, and obtains the position of the regular head 1 (S
6). If the CPU4 determines in (S8) that there is no change in the pilot signal level of this time and the previous time, it cannot immediately determine whether it is on-track or off-track, so it is leaked to the adjacent track n-1 and recorded. The pilot signal is detected as a crosstalk level and checked (S11). If the value detected by comparing with the value at the crosstalk level (S5) at the regular position is large, it is judged that the position has shifted to the adjacent head side, and if the value at the same level is the regular position, the value is If is small, it is far from the adjacent track (S12), so the actuator 5 is controlled in the direction of the regular position to maintain the position of the regular track (S13). A pulse motor or servo motor is used for the actuator.

[Effect of device]

The width of the track had to be made sufficiently wider than the range in which the tape could be stably run (the width of the meandering of the tape), but the head tracking function eliminates this need, so the tape of the same width is used. As a result, more tracks can be provided, and the tape cost and system installation area can be reduced.

[Brief description of drawings]

FIG. 1 is a block diagram of an essential part showing an embodiment of the present invention, FIG. 2 is a diagram showing a tape format, and FIG. 3 is a diagram showing a head tracking flowchart. 1 ... Head 2 ... Amplifier 3 ... Bandpass filter 4 ... CPU 5 ... Actuator

Claims (1)

[Scope of utility model registration request] 1. A device for recording and reproducing multiple tracks,
A means for recording a fixed cycle pilot signal in a specific track, a means for detecting a reproduction output obtained from the track, a filter means for extracting the pilot signal from reproduction outputs obtained from an adjacent track, and a head. An actuator that moves the track in a direction that traverses the track relative to the track, a storage unit that temporarily stores the detected playback output, and the temporarily stored playback output and a newly played playback output are compared. Then, the driving means is driven by the judging means for judging the increase / decrease and outputting the driving output to the actuator, the driving means for driving the actuator so that the head is at the center position of the track, and the driving means. When the position of the head is at the center position of the track, the level of the signal extracted by the filter means is temporarily set. Comprising a storage means for 憶 multi track long recording apparatus being characterized in that so as to compare and track driving and controlling the Akuchiyueta data at the new head position and the temporary storage data.