JPH03185652A - Magnetic recorder - Google Patents

Abstract

PURPOSE:To securely enable the recording by outputting a recording signal based on a reference of the rise and fall of a switching pulse signal. CONSTITUTION:The subject device is provided with a switching pulse signal generating means 22 for generating the switching pulse signal SWP based on output signals FG and PG of a speed detecting means fitted to a rotary drum 10 and a head position detecting means, a delay means 32 for this signal SWP and a recording signal generating means 34 for outputting a recording signal SREC to magnetic heads 20A and 20B mounted on the rotary drum 10 based on the timing of changing signal levels of an output signal SWPD of the delay means 32. Consequently, even when the rotation of the rotary drum 10 is out of order, the recording signal SREC can be supplied in response to the timing of starting scanning of the magnetic heads 20A and 20B. By this method, the recording can be performed in a right format.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a magnetic recording device, and can be applied to, for example, a digital audio recorder that records and reproduces digital audio signals.

B. Summary of the Invention The present invention enables reliable recording in a magnetic recording device by outputting a recording signal based on the rising and falling edges of a switching pulse signal.

C. Conventional technology Conventionally, in magnetic recording and reproducing devices (hereinafter referred to as digital audio recorders) that record and reproduce digital audio signals using a rotating drum, recording signals are output based on the falling edge of a switching pulse signal. It was being done.

That is, as shown in FIG. 3, a digital audio tape recorder l winds a magnetic tape 12 diagonally around a rotating drum 10 using guide rollers 2 to 5 and an inclined guide 6.7, and drives it using a pinch roller 14 and a capstan motor 16. By running the magnetic tape 12 with the capstan 18 and rotating the rotating drum 10 at a predetermined speed, the magnetic head 20 mounted on the rotating drum 10 is
Scanning trajectories A and 20B are sequentially formed diagonally on the magnetic tape 12.

Furthermore, as shown in FIG. 4, the digital audio tape recorder l switches the output signals FC and PC (FIG. 4 (A) and (B)) of the speed detection sensor and head position detection sensor attached to the rotating drum 10. to the pulse signal generation circuit 22 and to the magnetic heads 20A and 20B.
The switching pulse signal swp whose signal level changes at the timing of the start of scanning is set to the upper base (FIG. 4(C)).

Furthermore, the switching pulse signal SWP is outputted to the delay circuit 24 having a monostable multivibrator circuit configuration, and after the signal level rises at the timing of the fall of the switching pulse signal SWP, the signal level falls after a predetermined period t4 has elapsed. Reference signal DPG (Fig. 2 (
D)).

As a result, the recording signal generation circuit 26 generates a recording signal S□C (represented by symbol A (see FIG. E)) After outputting the reference signal DP
By outputting the recording signal 5R1 ((represented by symbol B) for the B head 20B after a period t has elapsed from the falling edge of G, the recording signal S□ is output based on the falling edge of the switching pulse signal SWP. do.

As a result, the recording signal S□
, to the magnetic heads 20A and 20B, the digital audio signal D is output in a predetermined format.
It is designed to be able to record l1tC.

D Problems to be Solved by the Invention By the way, in this type of digital audio tape recorder, the rotation of the rotary drum 10 is disturbed, and
With respect to the scan start timing of 0A, the B head 20B
The timing of the start of scanning may be shifted.

In this case, the switching pulse signal swp
The recording signal S□ is based on the falling edge of S□. When outputting , the scanning start timing of the B head 20B is shifted,
This results in a shift in the timing of the output of the recording signal save with respect to the timing of the start of scanning of the B head 20B.
Digital audio signal DII in correct format
There was a problem that it was difficult to record the IC.

The present invention has been made in consideration of the above points, and it is an object of the present invention to propose a magnetic recording device that can record in a correct format even if the rotation of the rotating drum is disturbed.

E Means for Solving the Problem In order to solve this problem, in the present invention, a switching pulse signal SWP is generated based on the output signal FGSPG of the speed detection means and the head position detection means attached to the rotating drum 10. a switching pulse signal generation means 22 for delaying the switching pulse signal SWP, a delay means 32 for delaying the switching pulse signal SWP, and an output signal 5WP of the delay means 32.
The magnetic head 20A120 mounted on the rotating drum 10 is based on the timing of switching the signal level of D.
Recording signal generation means 34 that outputs recording signal S*VC to B
and be prepared.

The recording signal S□ is sent to the magnetic heads 20A and 20B mounted on the rotary drum 10 based on the timing of switching the signal level of the output signal 5WPD of the F action delay means 32. By outputting this, even if the rotation of the rotary drum 10 is disturbed, the recording signal S□ can be supplied in accordance with the scanning start timing of the magnetic heads 20A and 20B.

G example Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In FIG. 1, in which parts corresponding to those in FIG. 3 are given the same reference numerals, 30 indicates a digital audio tape recorder as a whole, and the recording signal S□, Output.

That is, as shown in FIG. 2, the delay circuit 32 uses the output signals FC and PG (FIG. 2 (A) and (B)) of the speed detection sensor and the head position detection sensor as a reference to generate the switching pulse signal generation circuit 22. The switching pulse signal swp < Fig. 2 (C)) output from the delay time t4
A delayed signal 5WPD (FIG. 2(D)) is generated by delaying the signal by 5WPD.

The recording signal generation circuit 34 outputs a delayed signal 5WPD as a reset signal to a counter circuit 36 that counts a predetermined clock signal CK, thereby generating a delayed signal 5WP.
After the signal level of D is switched, the signal level is switched when the rotating drum 10 rotates approximately 174 times.
to make use of.

Further, the recording signal generation circuit 34 supplies the reference signal S1 and the delayed signal 5WPD to the modulation circuit 40 via the OR circuit 38, thereby generating the magnetic heads 20A and 20 based on the switching of the signal level of the switching pulse signal swp.
During the period when B scans the magnetic tape 12, the recording signal S□
C (Fig. 2 (E)) is output.

Therefore, since the switching of the signal level of the switching pulse signal SWP is used as a reference, if the rotation of the rotary drum 10 is disturbed and the timing of the start of scanning of the B head 20B deviates from the timing of the start of scanning of the A head 20A. However, the timing of the output of the recording signal S□ can be shifted and output by the amount that the scanning start timing of the B head 20B is shifted. In this way, the shift in the scanning start timing is corrected and the digital audio signal is output in the correct format. DIIC can be recorded.

Further, in the recording signal generation circuit 34, the recording signal SllIC can be generated based on only the delay signal 5WPD instead of the switching pulse signal SWP and the reference signal DPG, and the configuration of the recording signal generation circuit 34 can be simplified accordingly. can be converted into

According to the above configuration, the recording signal s ti is determined based on the switching of the signal level of the switching pulse signal SWP.
By outputting c, even if the rotation of the rotary drum 10 is disturbed, the timing of outputting the recording current 5IIEc can be corrected and output accordingly, and thus the digital audio signal D□ can be recorded in the correct format. can.

In the above-described embodiment, a case was described in which a digital audio signal was recorded, but the present invention is not limited to this, and can be widely applied to magnetic recording devices that record various types of data.

According to the above-mentioned effects of the invention, by outputting the recording signal based on the switching of the signal level of the switching pulse signal, even when the rotation of the rotating drum is disturbed,
It is possible to obtain a magnetic recording device that can record in a correct format by correcting the output timing of the recording current.

[Brief explanation of drawings]

FIG. 1 is a route map showing a digital audio tape recorder according to an embodiment of the present invention, FIG. 2 is a signal waveform diagram for explaining its operation, and FIG. 3 is a route map showing a conventional digital audio tape recorder. FIG. 4 is a signal waveform diagram for explaining the operation. 1.30...Digital audio chip recorder, lO...Rotating drum, 12...
Magnetic tape, 20A, 20B...magnetic head,
22...Switching pulse signal generation circuit, 2
4.32...Delay circuit, 26.34...
- Recording signal generation circuit.

Claims (1)

[Scope of Claims] A switching pulse signal generating means for generating a switching pulse signal based on output signals of a speed detecting means and a head position detecting means attached to a rotating drum; and a delay means for delaying the switching pulse signal. , a recording signal generating means for outputting a recording signal to a magnetic head mounted on the rotary drum based on the timing of switching the signal level of the output signal of the delay means. Device.