JPH02310843A - Recording method for rotary head type digital recording and reproducing device - Google Patents

Abstract

PURPOSE:To rewind the exact length of a tape by recording a mark to the specified tape position of a final group when data to be completed over one or plural groups are recorded, and rewinding the tape by fixed quantity according to the mark after the recording is finished. CONSTITUTION:A save instruction is transmitted through an input/output device 17 and a command circuit 18 to a system control circuit 15 and a mechanism is set to a recording state. Then, the data to be supplied through a recording /reproducing amplifier 4 to a rotary head 1a are recorded for the unit of the group and a save mark ID is recorded only to the prescribed length of the final group. After the recording is finished, the data are extracted by rapidly reversely reproducing the data from an A point and when the save ID mark is read at a B point by a sub code processing circuit 14, a capstan motor 2 is stopped. Thus, in case of continuous recording, an error in the rewinding quantity of the tape is reduced and operation can be speedily transferred to next recording operation. Then, the responsiveness of a rotary head type digital recording and reproducing device can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Industrial Application Field The present invention is applicable to, for example, a rotary head type digital audio tape recorder (R-DAT) as a storage device of an information device.
This invention relates to a signal recording and reproducing method for use as a data recorder.

(B) Conventional technology Conventionally, in R-DAT, an information recording area for recording digitally converted music signals is formed in the center of the trace of each track of a tape that is helically scanned by a rotating head, and the information recording area for recording digitally converted music signals is A tracking area (ATF area) and a subcode area are formed on both sides of the recording area, that is, at the trace start end and the trace end of each track. A servo signal for tracking control is recorded in this tracking area, and a start ID indicating the beginning of the song is recorded in the subcode area along with song number and time information.
etc. were recorded.

However, recently, it has been considered to use such R-DAT as a storage device for information equipment; for example, 120
R-DAT, which uses minute tapes, can achieve a storage capacity of approximately 1 GB, making it a low-cost, large-capacity, and small-space recording device compared to conventional storage devices such as MT devices and hard disk devices. can be provided.

Also, recording is started again from the position where recording ended, that is, when splicing the tape, the tape is rewound a certain amount from the position where recording ended, and tracking is adjusted, and splicing recording is started from the position where recording ended. Was. It is desired that the amount of rewinding for adjusting tracking be as small as possible and error-free.

As for the prior art, there is one disclosed in Japanese Patent Application Laid-Open No. 60-22790 (G11B27102), in which the amount of rewinding is controlled by counting the FG of the capstan.

(c) Problems to be Solved by the Invention However, if the capstan FG is used to control the amount of rewinding, the amount of rewinding may increase and errors may occur, which may disturb the consistency of the tracks in the spliced recording section. there were.

(d) Means for solving the problem The present invention uses helical scanning with a rotating head.
- In a rotary head type digital recording and reproducing device that records digital signals on a tape with 2 tracks of 17 frames and multiple frames as one group, the data is completed over one or more groups. This paper proposes a recording method for a rotary head type digital recording/reproducing apparatus, which is characterized in that when recording, a mark is recorded at a specific tape position of the last group, and after recording is completed, the tape is rewound by a certain amount according to the mark.

(e) Effect: According to the above means, it is possible to rewind the tape by an accurate fixed amount after recording is completed.

(f) Example An embodiment of the present invention will be described below with reference to the drawings.

The data recorder of the present invention records and reproduces data in groups, each group having two tracks as one frame and a plurality of frames (for example, 32 frames) as one group.

The 7-ohmat of the above track is the same as that of R-DAT for audio as shown in Figure 2, and (D) is the data area;
(T) is an ATF area, and (S) is a subcode area.

Next, an example of the system configuration of this embodiment will be explained using FIG. 3. In the figure, (1) is a rotary cylinder motor to which two recording/reproducing rotary heads (1a) are attached, (2) is a capstan motor, (3) is a reel motor, and (4) (6) is a reel motor driver for driving the reel motor (3); (7) is for controlling the reel motor (3); Reel servo circuit, (8) is a cylinder motor driver that drives the rotating cylinder motor (1), (9) is a cylinder servo circuit that controls the rotating cylinder motor (1), (lO) is a capstan motor (
2) a capstan motor driver that drives the (11)
is a capstan servo circuit that controls the capstan motor (2), (12) is an intra-frame signal processing circuit that adds an error correction code to the recording signal, performs interleaving, etc. during recording in units of two tracks, and (13) is a circuit that performs interleaving, etc. during playback. This is an ATF circuit that extracts signals in the ATF area from the output of the recording/reproducing amplifier (4) through the intra-frame signal processing circuit (12) to generate a tracking error signal.This error signal is sent from the capstan servo circuit (11). The signal is added to the signal and used to control the rotational speed of the capstan motor (2).

(14) is a subcode processing circuit that extracts signals in the subcode area from the output of the recording/playback amplifier (4) through the intra-frame signal processing circuit (12) during playback, and (15) is a subcode processing circuit that uses various operating keys manually and subcode processing. The in-group signal processing circuit (16) and the cylinder servo circuit (9) are controlled by the output from the circuit (14) or the command circuit (18) described later.
, a system control circuit that controls the capstan servo circuit (11), and the reel servo circuit (7); (16) is a group that adds error correction codes and performs interleaving during recording, and performs error correction, deinterleaving, etc. during playback. The inner signal processing circuit (17) is the host computer (2
(18)
The system control circuit (15) responds to instructions from the host computer (20) through this input/output device (17).
(19) is the tape wrapped around the rotating cylinder motor (1), (20) is the host computer, (21) is the FG of the capstan motor (2)
This is a capstan FG counter that counts pulses.

Next, the operation of such a system configuration example during recording will be explained. First, when a data save command is issued by operating the keyboard on the host computer side, the save command is transmitted to the system control circuit (15) through the input/output device (17), finger, and current circuit (18), and the mechanism enters the recording state. The data set and supplied to the rotary head (1a) through the recording/reproducing amplifier (4) are recorded in groups, and a save mark ID is recorded for a predetermined length in the last group. For example, if one minute of n glue is required to save one file, a flag indicating a save ID mark is added to the subcode area for a predetermined length from the beginning track of the nth group, which is the last group. Stand up (see Figure 1) and record n groups.

After the end, the data is extracted by immediately reproducing it in reverse from point A, and the subcode processing circuit (14) extracts the data from the save I.
When the D mark is read at point B, the capstan motor (2) is stopped, but the cylinder motor (1) is kept rotating, and then the light from the host computer (
(Record) Leave it in a state of waiting for commands. However, if a write command does not come to the command circuit (18) for several minutes, the system control circuit (15) stops the cylinder motor (1). When a write (record) command is received, the system control circuit (1
5) changes the operating mode to recording state to record the next group;

(G) Effects of the Invention As described above, according to the present invention, the error in tape rewinding amount during continuous recording is reduced, the next recording operation can be quickly started, and the responsiveness of the apparatus is improved. This is something that can be done.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram for explaining the recording method of the present invention, FIG. 2 is a diagram showing a 7-track format of an R-DAT, and FIG. 3 is a block diagram showing the configuration of the apparatus of the present invention. (1)... Cylinder motor, (2)... Capstan motor, (14)... Subcode processing circuit, (15
)...System control circuit, (18)...Command circuit.

Claims (2)

[Claims] (1) In a rotary head type digital recording and reproducing device that records digital signals on a tape that is helically scanned by a rotary head in units of groups, with two tracks as one frame and a plurality of frames as one group, 1 Alternatively, when recording complete data across multiple groups, a rotary head type digital recording is characterized in that a mark is recorded at a specific tape position of the last group, and the tape is rewound by a certain amount according to the mark after recording is completed. Recording method for playback device. (2) Claim (1) characterized in that the mark is recorded in an area other than the area corresponding to the tape rewind amount for tracking adjustment from the rear end of the last group.
A recording method using the rotary head type digital recording/reproducing device described above.