JPH01320656A - High speed searching method for rotary head type digital audio tape recorder - Google Patents

Abstract

PURPOSE:To attain the regeneration from the peak signal of a program by detecting the program time information of the starting point of starting identification information, rewinding a tape only for the time equivalent to time information and regenerating a main signal. CONSTITUTION:Until the leading edge of starting identification information ID is detected, a tape is travelled at an about 200 times speed, and when the leading edge is detected, the tape travelling is stopped, the overrunning part travels the tape in the reverse direction at the 8 times speed at the time of the ordinary reproduction, the trailing edge of a starting ID is detected and the taped travelling is switched to an ordinary reproducing condition. Next, simultaneously, when the leading edge of the starting ID is detected, performance time information P time at this time is latched, after the tape is reversely travelled at (n) times only for the tape period equivalent to the P time, the ordinary reproducing condition is entered, and without being reproduced from the way of the program corresponding to an omitted starting ID, the reproduction is started from the peak position of a program and a P time is operated and displayed by a P time counter.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a high-speed search method for a rotating head type digital tape recorder (hereinafter referred to as R-DA, T).
Special f: Recorded in the PCM area on the magnetic tape t'1. A high-speed search method (2) using start identification information (hereinafter referred to as start LD) recorded in the subcode area corresponding to the start position of the program.

(b) Prior Art An example of the system configuration of a general F-DAT is shown in FIG. 4 and will be described. In the same figure, (1) is the input terminal into which an analog audio signal is input, and (2) is the input terminal that converts this audio signal into a digital signal that has undergone interleaving, time compression, etc.
(3) is a servo signal generation circuit that generates servo signals (i.e., pilot signals, sync signals, etc.) for tracking control;
(4) is a long code signal generation circuit that generates subcode signals such as the start ID and track number and performance time information (hereinafter referred to as PRI/IM) for high-speed search; (5) is a long code signal generation circuit for each tape Tora, ri (information recording area formed respectively,
Digital conversion σ to tiger, king region, and subcode region
In order to record the back door signal, servo signal, subcode signal (-switch circuit that is selectively switched at a predetermined timing, (6) is a recording amplifier, (7) is an output from the recording amplifier (6) 180 degrees Two separate recording/playback rotating heads (8
1 (-Rotary head cylinder supply
Lance, (9) is a playback amplifier, α■ is a playback amplifier (9)
A digital signal processing circuit that generates a clock from data using a PLL, etc., converts it into a digital signal, and then converts it into an analog signal (PC'M demodulation). (1) is the output terminal that outputs the servo signal for tracking control from the output of the regenerative amplifier (9), and the servo signal that generates tracking error 1. 9) Extract subcode signal 7 from the output and start I
This is a subcode processing circuit that performs [Dri) detection and P time processing.

04 is the take-up reel motor that directly drives the take-up reel shaft, 0.51 is the supply reel motor that directly drives the supply reel shaft, decoy is its motor drive circuit, αη08 is the cylinder motor and its motor drive circuit, 9■ is a capstan motor and its motor drive circuit. and,(
21) is various operation key manual power and subcode processing circuit f1)
The microcomputer f- is a control circuit that controls the sewing/pause, rotational speed, rotational direction, etc. of each motor un51aTIas based on the output from the motor un51aTIas. The tape is wrapped 9L]O around the rotating head cylinder.

Therefore, first, during recording (= is the input terminal sync signal, etc.) and the subcode signal (start ID, track number, P time) generated by the subcode generation circuit (4) are sent to the recording amplifier (6) in two time divisions.Then, this recording The output of the amplifier (output is the rotary transformer of the rotating head cylinder (
7) and is recorded on the tape by the recording/reproducing rotary head f8) (2). At this time, a track pattern as shown in Fig. 5 is formed on the tape. ,
An information recording area Φ) is formed in the center of each track, and an information recording area (Ts) (Tθ) and subcode areas (38) and (88) are formed on both sides thereof, respectively.
:Become.

Next, during playback, various signals recorded on the tape t2Z+2 are read by the recording/playback rotary head (81C) and sent from the rotary transformer (7) of the rotary head cylinder to the playback amplifier (9). Amplifier(
The output of 9) is a digital signal processing circuit 0 [and a PLL etc. 1
: A clock is created from the data, which is converted into a daisymel signal, and then converted into an analog signal 1', '.
The original audio signal is output from the output terminal αυ. Furthermore, the output of this reproducing amplifier (-)) is the servo circuit (12+ (: sender 2, nl), which extracts the servo signal for tracking control and generates a tracking error signal, which is sent to the motor. The output of the reproduction amplifier (9) is also sent to the subcode processing circuit α3, where all the subcode signals are extracted and the song number is determined. Reads the time and time information, displays the control circuit through the JJ2 display (: sends out, tunes number and time information yr< L1vh pattern
- 1 high speed length using Star 8 ID in Mizonari's R-DATC mentioned above -
Chi (= Regarding Sanyo Technical Review Vo1.1
9 No. 2 (published in August 1987), and what is the content? 6th showing high speed search rhythm
Figure (a) (1)) (0) ((l To explain with reference to the residue, programs (n), (n+
1), (n+2), "', the start ID is recorded in the subcode area for about 9 seconds (see Figure (a) (1)) of CH2)) In the search operation in the 0 fast forward direction, In the first step, when the rising edge of the start ID is detected, tape running is stopped, and in the second step, the 7th
Pinch roller C3n'v capstan (191
L) Press the tape by 1m, and then run the tape (2211) in the opposite direction using the capstan motor (2) at 8 times the tape speed during normal playback until the fall of the start ID 9 is detected. When the falling edge of ID is detected, pinch C7- and FC31+ are connected to capstay (1
9a) While the tape is being crimped, run the tape in the normal playback state (;
switch and end the cueing operation.

Next is the search operation in the rewinding direction.As the first step, the cylinder servo system? The search mode is set, and the tape is driven by the reel motor at approximately 200 times the speed in the reverse direction. When a falling edge from the start is detected, the tape is run at 8 times the forward direction (by the reel motor) at approximately 200 times the speed. Tape running 1: Switching, and then when the rising edge of the start ID is detected, the tape runs in the reverse direction at 8x speed.The subsequent operation is the same as the fast forward direction search operation.

Using the above algorithm, it is possible to cue any program by high-speed search.

(c) Problems to be Solved by the Invention In particular, the above-mentioned high-speed search (according to which the user performs various sub-code hereto records) searches the beginning of the recorded period (approximately 9 seconds) from the start. In such a case, the PCM area (2) will be played back from a little later than the beginning of the recorded program, and will not be played back from the exact beginning of the program, and the P time will be There are nine drawbacks, such as not being displayed.

2) Precautionary Means to Solve the Problem The present invention is based on a start ID'g recorded in a subcode area on a magnetic tape that is helically scanned by a rotating head.
When performing a high-speed search and reproducing all the main signals recorded from the vicinity of the starting point, after detecting the start ID 7, the P time at the starting point of the start ID is reproduced, and the P time at this time is not zero. In this case, the tape is rewound for a time corresponding to this time information: 2, and then the main signal is reproduced, and at the rewinding point, P time is set to zero, and the traveling distance of the tape (= proportional to P time is calculated, The present invention also proposes a high-speed search method for a rotary head type digital audio tape recorder, which is characterized by the following characteristics.

(E) Effect: According to the above method (:), even if the start ID recorded in the subcode area is missing, the program can be played back correctly from the beginning position of the program recorded in the PCM area (2) after high-speed search operation. It is possible to start (with the second
P time can be displayed from the top position.

(F) Embodiment An embodiment of the present invention will now be described with reference to FIGS. 1 to 3 of the drawings, but since the system configuration example is the same as that described in the conventional example, the explanation thereof will be omitted. .

Figure 5(a)(t)) shows the PCM area on the tape (=recorded program (f
1), (n+1), (n+2), .

The following (') shown in the same figure (C) is a schematic diagram of a situation in which, for example, a ski game ID (a subcode for cutting unnecessary parts such as narration) is recorded for about 9 seconds just before the start rD. When erasing with the skip ID '47 8 record mode, the erasing period is generally 9 to prevent unerased data.
It is set longer than seconds. For this reason, the same figure (6,
) As shown in (:', there is a missing part at the beginning of the start ID.

A tape with the beginning part of the start ID missing as shown above (
The high-speed search operation of the start ID in the flowchart of FIG. 1 and the time chart of FIG. 2 (see FIG. 6(d)) will be explained below.

First, if you specify a high-speed search for the start ID using the operation keys (step 1), control circuit C21 in Figure 4)
As a first step, the (microcomputer) sets the entire cylinder servo system to search mode until it detects the rising edge of the start ID.
The tape is driven by a reel motor (step 2) so as to run at about 200 times the speed. As the second step, when the rising edge of the start ID is detected (step 3), tape running is stopped (step 4), but due to the inertia of the reel motor (151) Since the 6th
As a step, as shown in Figure 7, the pinch roller Ga1a' capstan (19a) E is crimped, and the capstan motor (2) plays the tape at 8 times the tape speed of normal playback until the fall of the start rD signal is detected. Reverse direction (two runs (step 5)).

Then, the fall of the start ID is detected (step 6)
When the pinch roller C31 capstan (19a)
- Switch the tape running to the normal playback state while keeping the two pressure-bonded (step 7). The fourth step is to detect the rise of the start ID (step 8) and at the same time (=P
The time (P t) is latched (step 9), and the P
If the tape period is adjusted to the time (P t), that is, if the P time at this time represents 2 seconds, the tape is made to move backwards at 0 times for 2 seconds (step 12), and then P is instantaneously changed. Reset the time counter (step 16),
Immediately the normal playback state (step 11) (for both of them, the program becomes playable from the beginning of the program without being played from the middle of the program corresponding to the missing start ID (:P time counter (from 2) P time can be calculated and displayed.

Please note that the tape with no missing start ID (6th '1')
Step 1 to step 9 are the same as the above explanation, but in the normal playback state (step 7), P time (P'C) is latched GtL so 0-.
> P (Since A (PC) is determined to be t-o:oo:oo, the normal playback state (step 11) is maintained without going through steps 12 and 16).

(g) Effects of the Invention According to the high-speed search method of the present invention (2), when performing a high-speed search 7 for the start ID on an incomplete tape in which the beginning part of the period in which the start ID and P time are recorded is missing. Even if there is, it is possible to latch the P time at the starting point of the start ID and reproduce the main signal from the starting position of the main signal in front of the starting position of the start ID. As soon as P
It is extremely useful because it can display the time.

[Brief explanation of the drawing]

Figure 1 is the ninth diagram σ explaining the high-speed search method of the present invention.
- Are the charts, Figures 2 and 6 the high-speed search method of the present invention? A time chart for explanation; FIG. 4 is a block diagram showing the system configuration of a general rotary head type digital audio tape recorder (hereinafter referred to as R-DAT); FIG. 5 shows the track format of R-DAT. 6 is a time chart for explaining the conventional high-speed search method, and FIG. 7 is a schematic diagram of the tape running system of R-DAT. CT'3) ('l) ・ ) racking area, (Se)
(81))... Subcode area, O))... Recording area (PCtM area).

Claims (2)

[Claims] (1) A tracking area and a subcode area are formed together with the PCM area on each track of the tape that is helically scanned by a rotating head, and when recording, the digitally converted main signal is recorded in the PCM area, and the tracking area is The tracking control signal is also stored in the subcode area at least as start identification information (hereinafter referred to as start ID) indicating the start position of the program recorded in the PCM area and program time information (hereinafter referred to as P time) indicating the playing time of the program. a rotary head digital audio tape recorder for recording a start I recorded in a subcode area on said tape;
When searching D at high speed and reproducing the main signal recorded near the starting point of the start ID, after detecting the start ID, detect the P time at the starting point of the start ID, and if the P time at this time is zero. If not, the tape is rewound for a time corresponding to this time information, and then the main signal is played back. (2) A tracking area and a subcode area are formed together with the PCM area in each track of the tape that is helically scanned by a rotating head, and the main signal converted to a digital signal is recorded in the PCM area during recording, and the tracking area A tracking control signal is sent to the subcode area, and start identification information (hereinafter, start I
A rotary head type digital audio tape recorder that records program time information (hereinafter referred to as P time) indicating the playing time of a program (hereinafter referred to as P time), the start I recorded in a subcode area on the tape.
When searching D at high speed and reproducing the main signal recorded near the starting point of the start ID, after detecting the start ID, the P time at the starting point of the start ID is played back, and the P time at this time is zero. If not, the tape is rewound for a time corresponding to this time information, and then the main signal is played back, the P time is set to zero at the end of the rewinding, and the P time proportional to the running distance of the tape is calculated. , and a high-speed search method for a rotary head digital audio tape recorder.