JPH01137405A - Recording system for rotary head type tape recorder - Google Patents

Abstract

PURPOSE:To equalize characteristics of an electromagnetic conversion system and a recording system to those of the standard mode by changing the signal frequency handled at the time of recording to an n-fold signal frequency of a normal option mode and changing the tape running speed and the cylinder rotational frequency to n-fold those of the normal option mode and intermittently driving motors to record signals. CONSTITUTION:A cylinder servo circuit 5, a capstan servo circuit 6, and a reel servo circuit 7 are controlled by a control circuit 2 through independent control lines 19-21. A cylinder motor 15 is rotated at an n-fold speed (n is a positive integer) of the option mode, and a capstan motor 16 and reel motors 17 and 18 are so intermittently driven that they are stopped for (1-1/n) after being driven for 1/n, and they are rotated during driving for 1/n so that the tape is run and wound at the n-fold speed of the option mode. Thus, characteristics of the electromagnetic conversion system and the recording system are equalized to those of the standard mode.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention is applicable to an optional mode (with a sampling frequency of 32 kHz), which is one of the recording and playback modes of a rotary head digital audio tape recorder (R-DAT).
That is, it relates to a recording method in long play mode).

(b) Conventional technology Conventionally, in such an R-DAT, each signal is recorded by dividing the area into each track on a tape that is helically scanned by a rotating head. An information recording area for recording information signals such as music converted into digital signals is formed in the center of the trace of the track, and an information recording area for recording information signals such as music converted into digital signals is formed, and on both sides of this information recording area, that is, at the trace start and end of each track. Each of them forms a sub-food area together with the tracking area. A servo signal for tracking control is recorded in this tracking area, and a sub-food signal such as a start ID indicating the beginning of a song is recorded in the sub-code area along with song number and time information.

In addition to the standard mode with a sampling frequency of 48kHz, the R-DAT's recording and playback mode has an optional mode with a sampling frequency of 32kHz.In the normal standard mode, the cylinder rotation speed is 200kHz.
Orpm, the system operates at a tape running speed of 8.15 ffll/sec, and in the normal option mode, the cylinder rotation speed is 1100 orp and the tape running speed is 4.075.
The system was running at mm/sec. Then, in order to ensure that the recording patterns created on the tape by recording in both modes were exactly the same, the signal frequencies handled in the normal option mode were lowered to those in the standard mode. That is, in the past, recording in the standard or optional mode was
It was done as shown in the figure. In other words, the key scanning section (
When you specify playback in normal standard or option mode in 1), the control circuit (microcomputer) (2) controls the digital signal processing circuit (3), recording/reproducing amplifier (4), cylinder servo circuit (5), and capstan. Servo circuit (6)
, controls the reel servo circuit (7). That is, the digital signal processing circuit (3) uses the A/D converter (9) to set the sampling frequency to 48kHz or 32kHz under control from the control circuit (2) via the control line (8).
The information signal that has been digitally converted at Hz is subjected to addition of an error correction code, interleaving, etc., and outputted at a predetermined timing.This information signal is first amplified by the recording/reproducing amplifier (4) and then sent to the rotating cylinder (10). The information is then recorded in the information recording area. The recording/reproducing amplifier (4) is switched for recording under control from the control circuit (2) via the control line (11). In addition, the cylinder servo circuit (5), capstan servo circuit (6), and reel servo circuit (7) are connected to the control line (12) (
13) Under the control from the hunt roll circuit (2) according to (14), the tape running speed is 8.15 in the standard mode.
11117sec 1 cylinder rotation speed is 2000rpt
Cylinder motor (15) and capstan motor (16) so that the system operates at a speed of 4.075 m1/sec and cylinder rotation speed of 1100 Orp in optional mode.
, controls the rotational speed of the reel motors (17) and (18).

(c) Problems to be solved by the invention However, in such a conventional recording method, it is necessary to set the signal frequency handled during recording in the optional mode to the same frequency as the signal frequency handled during recording in the standard mode. For example, in option mode, the 130kHz pilot signal used for tracking control becomes 65kHz and rotates. Since the cylinder was not fully supplied, the signal waveform (particularly the phase plane) was affected by the force and throat-off frequency of the rotary transformer being close to that of the rotary transformer.

(d) Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides tracking/king control along with information signals such as music to each track on a tape that is helically scanned by a rotating head. In a rotary head tape recorder that records servo signals etc. in separate areas, the sampling frequency is 3.
When recording in the 2kHz speed mode, the signal frequency handled during recording is n times the signal frequency handled in the normal option mode (tape running speed 4.075 mm, cylinder rotation speed 101000 rp) (however, n is a positive integer), and the tape running speed and cylinder rotation speed are changed to n in the normal option mode.
After changing to double and driving the tape 1/n (1-1/n)
It is designed to perform recording by intermittent driving so as to stop.

(e) Effect: In the recording method of the present invention described above, recording can be performed in the optional mode where the sampling frequency is 32 kllz without causing waveform distortion of the low frequency signal in the rotary transformer. For example, when the sampling frequency is set to nm2. Since the signal frequency to be handled is the same as in the standard mode, the characteristics of the electromagnetic conversion system and recording system can be made the same as in the standard mode.

(F) Embodiment Hereinafter, an embodiment of the present invention will be described using the system configuration example shown in FIG. Incidentally, the same components as in the prior art are designated by the same reference numerals and their explanations will be omitted.

That is, according to the recording method of the present invention, when recording in an option mode with a sampling frequency of 32 kHz, the signal frequency handled during recording is changed to the normal option mode (tape running speed 4.075 x 7'sec, cylinder The rotation speed is changed to n times the signal frequency handled at 10100 Orp (where n is a positive integer), and the tape running speed and cylinder rotation speed are changed to n times of the normal option mode, and the tape is changed to 1/n. After driving (1
-1/n) It is designed to record by intermittent driving so as to stop, and for this purpose, the cylinder servo circuit (5), the capstan servo circuit (6), and the loop servo circuit (7 ) are controlled by separate control lines (19, 20, and 21), respectively.The cylinder motor (15) is rotated at n times the speed of the option mode, and the capstan motor (16) and reel motor ( 17) After driving (18) by 1/n (1-1/n')
It is driven intermittently so as to stop, and rotated to run and wind the tape at n times the speed of the 1/n drive mode.

As a different matter, a case will be described in which recording is performed in an option mode with a sampling frequency of 32 kHz at a tape running speed and cylinder rotation speed twice that of the normal option mode. That is, when the key scan section (1) specifies recording according to the method of the present invention, the hunt control circuit (2) operates the digital signal processing circuit (3), the recording/reproducing amplifier (4), the cylinder servo circuit (5), and the capstan servo circuit. circuit(
6), controls the reel servo circuit (7). That is, the digital signal processing circuit (3) is controlled by the Huntroll circuit (2) through the Huntroll line (8), so that the A/D
The converter (9) digitally converts the information signal at a sampling frequency of 32 kHz, adds an error correction code, performs interleaving, etc., and outputs it at a predetermined timing.This information signal is first amplified by the recording/reproducing amplifier (4). After that, the information is recorded in the information recording area via the rotating cylinder (10). Here, it is assumed that the signal frequency handled by the digital signal processing circuit (3) has been changed to twice the signal frequency handled in the normal option mode, that is, the same as the signal frequency handled during recording in the standard mode. It is assumed that the recording/reproducing amplifier (4) is switched for recording under control from the control circuit (2) via the control line (11). Also, cylinder servo circuit (5), capstan servo circuit (6) and reel servo circuit (7)
are controlled by the control circuit (2) through the control lines (19), (20, and 21), respectively, so that the tape running speed is doubled to 8.15 min/sec, the cylinder rotation speed is doubled to 2000 rp+*, and the intermittent The rotation of the cylinder motor (15), capstan motor (16), and reel motor (17) (ts) is controlled so that the system operates at the drive rate. That is, the cylinder motor (15) is
Rotate at 00 rpm, capstan motor (16)
For example, after driving the handle motors (17) and (18) for 30tsaec at a tape running speed of 8.15cm/Sec,
Drive intermittently to stop EC. And this 30m
During the driving of 5ec, the information signal from the digital signal processing circuit (3) is recorded in the information recording area via the rotary cylinder (10). Here, RAM (22) is used for temporary storage of information signals to be recorded, and is 15m long.
Since the signal read in at 5ec is read out at 7.5taesc, the same recording pattern as recorded in the normal option mode can be made.

In addition, FIG. 2(d) shows the recording envelope waveform in the case of n=2 according to the present invention, and the same figure (!L) shows the recording envelope waveform when n=2.
00 Orpm head switching signal, FIG. 10B shows the recording envelope waveform in the standard mode, and FIG. Furthermore, in this embodiment, a case has been described in which the tape is driven for 30 tasec and stopped for 301 sec, but by increasing the capacity of the RAM (22), it is possible to lengthen the driving time and stopping time of one time of intermittent tape driving. For example, FIG. 3(c) shows drive 1.
The repeated stop time is 5 times that of the example (150tsse)
c drive, 150asec stop) is shown, and the same I! O (a) is the head switching signal when the cylinder rotation speed is 200 rpm, and (b) is the head switching signal when the cylinder rotation speed is 200 rpm.
This is a recording envelope waveform of m5ec drive and 30m5ec stop.

(G) Effects of the invention As described above, according to the present invention, the sampling frequency is 3.
Recording in the 2kliz option mode can be performed without causing waveform distortion of the low frequency signal due to rotor redrance. For example, if n = 2, the handled signal frequency will be the same as in the standard mode. Therefore, the characteristics of the electromagnetic conversion system and recording system can be made the same as in the standard mode.

[Brief explanation of the drawing]

FIG. 1 is a system configuration diagram of R-DAT used in the present invention,
Fig. 2 is a signal waveform diagram thereof, Fig. 3 is a signal waveform diagram of another embodiment, and Fig. 413! ! I is an example of a conventional system configuration of R to DAT. (3)... Digital signal processing circuit, (5)... Cylinder servo circuit, (6)... Capstan servo circuit, (7)... Reel servo circuit, (19) (20
)(21)...Control line.

Claims (1)

[Claims] (1) In a rotary head tape recorder that records information signals such as music as well as servo signals for tracking control in divided areas on each track on a tape that is helically scanned by a rotary head, its sampling frequency When recording in option mode with 32kHz, the signal frequency handled during recording is changed from normal option mode (tape running speed 4.075mm/sec).
c, the cylinder rotation speed (1000 rpm) is changed to n times the signal frequency handled (where n is a positive integer), and the tape running speed and cylinder rotation speed are changed to n times the normal option mode, and the tape A recording system for a rotary head type tape recorder characterized in that recording is performed by intermittent driving such that the tape is driven 1/n and then stopped (1-1/n).