JPS63317949A - Quick search system for rotary head type tape recorder - Google Patents

Abstract

PURPOSE:To shorten the search time by performing quick search for reproducing by quick access due to reel driving and slow access due to pinch roll/capstan driving and switching the state to the reproducing state after temporarily setting slow access in the reverse direction. CONSTITUTION:At the time of reproducing, the signal on a tape 22 is outputted as an audio signal to a terminal 11 through a recording head 8, a regenerative amplifier 9, etc. A servo circuit 12 generates a tracking error signal from the amplifier 9 to control a capstan motor 19. Simultaneously, the output of the amplifier 9 is inputted to a subcode processing circuit 13. In this constitution, first, reel motors 14 and 15 are controlled to perform quick access at the time of quick search. Next, when a signal S-ID indicating the start of music is detected, the capstan motor 19 is driven to perform slow access in the direction of REW. When the signal S-ID is detected again, the state is switched to the reproducing state after the motor 19 is driven for about 30msec in the direction of FF to suppress overrun.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a high-speed search method for a rotary head type cheap recorder that performs a high-speed search using a search signal completely recorded on a tape.

(b) Conventional technology Conventionally, in a rotary head type digital audio recorder (R-DAT), a signal is converted into a digital signal at the center of the trace of each track of a wave that is helically scanned by a rotating head. In addition to forming an information recording area for recording information signals such as audio, a track/king area and a subcode area are formed on both sides of this information recording area (i.e., at the trace start and end of each track). In this tracking area, a servo signal for tracking control was recorded, and in the subcode area, a search signal (S-ID) for high-speed search was recorded along with track number and time information. .Therefore, such a high-speed search of R-DAT requires 200 seconds when playing a tape.
This is done by reading the 5-ID as a search signal recorded from the beginning of each song for a certain period of time (several seconds) from the subcode area using a rotary spatula while running at more than twice the speed. In order to shorten the search time, such a high-speed search requires switching from high-speed access in which the tape is driven by a reel to low-speed access in which the tape is driven by a capstan, or switching the access direction (for example,
5- Indicating the beginning of the desired song by repeatedly or sequentially performing (from REW one-way access to FF direction access)
It is designed to search for an ID.

(c) Problems to be Solved by the Invention However, in such a high-speed search method, when the high-speed search ends and the transition is made from the low-speed access state to the playback state, an overrun occurs due to the inertia of the motor, causing the transition to the playback state. There is a problem in that conversion cannot be performed immediately, resulting in a loss of search time.

(d) Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides information signals such as audio on the tape, as well as a servo signal for tracking control and a search signal for high-speed search. In a rotary head type tape recorder that performs a high-speed search using this search signal, the high-speed search is performed using high-speed access by the tape reel drive and a tape pinch roller/
Low-speed access is performed by capstan drive, and when transitioning from the low-speed access state to the playback state upon completion of this high-speed search, the capstan motor is set to low-speed access in the opposite direction, and then the shift to the playback state is made. This is what I did.

(e) Effects According to the above-described high-speed search method of the present invention, there is no time loss when transitioning from low-speed access to the reproduction state upon completion of high-speed search, and the search time can be shortened.

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

That is, FIG. 1 shows a specific system configuration example of the R-DAT used in the present invention. A digital signal processing circuit that converts into a digital signal with a check code and subjected to processing such as time compression, (
3) is a servo signal generation circuit that generates servo signals (i.e., pilot signals, sync signals, etc.) for tracking control, and 4) is a servo signal generation circuit that generates track numbers, time information, and search signals (S- (5) is a subcode generation circuit that generates subcode signals such as ID); (5) is an audio signal that has been digitally converted into an information recording area, a tracking area, and a subcode area that can be formed on each track of the tape;
A switch circuit that is selectively switched at a predetermined timing to record servo signals and subcode signals, (6) is a recording amplifier, and (7) is a recording/reproducing rotary head that connects the output from the recording amplifier (6). (8) is a rotary transformer with a rotating head cylinder that supplies it, (9) is a regeneration amplifier, (10
) is a digital signal processing circuit that generates a clock from data using a PLL or the like and converts the output from the reproduction amplifier (9) into a digital signal, and then converts it into an analog signal.(11) is a digital signal processing circuit that outputs the original analog audio signal. This is the output terminal. (12) is a servo circuit that extracts a servo signal for tracking control from the output of the reproduction amplifier (9) and generates a 1-tracking error signal, and (13) extracts a subcode signal from the output of the reproduction amplifier (9). Extract 5
- A subcode processing circuit that performs ID detection. (14> is a take-up reel motor that directly drives the take-up reel shaft; (15) is a supply reel motor that directly drives the supply reel shaft; (16) is its motor drive circuit; (17)
<18) is a cylinder motor and its motor drive circuit, (
19〉(20〉) is a cab stan motor and its motor drive circuit.And (21) is a cab stan motor and its motor drive circuit.And (21) is each motor (
14) This is a control circuit that controls driving/stopping, rotation speed, rotation direction, etc. of (15), (17), and (19).

Therefore, during recording, the audio signal input to the input terminal (1) is first converted into a digital signal by the digital signal processing circuit (2), and then the servo signal (pilot signal or sync signal) is output from the servo signal generation circuit (3). etc.> and the subcode signal (track number, etc.) generated by the subcode generation circuit (4).
It is sent to the recording amplifier (6) together with the time information (5-ID). The output of this recording amplifier (6) is then sent to the rotary transformer (7) of the rotary head cylinder, and is completely recorded on the tape (22) by the recording/reproducing rotary controller (8).

Next, during playback, various signals recorded on the tape (22) are read by the recording/playback rotary spatula F: (8) and sent from the rotary transformer (7) of the rotating head cylinder to the playback amplifier (9). . The output of this reproducing amplifier (9) is then output to the digital signal processing circuit (10).
A clock for data extraction is created from the data using L, etc., which converts it into a digital signal, and then into an analog signal, which becomes the original audio signal and is output from the output terminal (11). Furthermore, this playback amplifier (9)
The output of is sent to the servo circuit (12), which extracts the servo signal for tracking control to generate a tracking error signal, which is sent to the motor drive circuit (2).
0> to control the capstan motor <19). Further, the output of the reproduction amplifier (9) is also sent to the subcode processing circuit (13).

Therefore, during high-speed search, this subcode processing circuit <1
At step 3), the subcode signal is extracted from the output of the reproducing amplifier (9), and 5-ID is detected.Based on the detection result, the control circuit (21) controls the cylinder motor (17).
rotational speed, supply/winding rate (14) (15)
) and the capstan motor (19), and controls the rotational speed and direction of rotation. Specifically, in the high-speed search, the pinch roller is separated from the capstan by a search operation from the playback state, and its reel morphs (14) and (15) are rotated at high speed, and the tape is brought into sliding contact with the cylinder while the pinch roller is moved 200 times faster than during playback. This is done by running the car at speed,
At this time, the cylinder motor (17) has a rotational speed <2000 rpm> in the normal regeneration state in order to match the linear velocity.
It rotates faster or slower than the . For example, as shown in Figure 2, if 5-ID indicating the beginning of the target song is detected in a state of high-speed access to the FF direction (
Point A), due to the high speed, there is a slight overrun and the state is switched from the high speed access state (20,000 times speed) in the FF direction to the low speed access state (10 times speed) in the REW direction (8 points).

To run the tape in this low-speed access state, the pinch roller is pressed against the capstan, and the capstan motor (1
9>. When 5-ID is detected again in this low-speed access state, the capstan motor (19) is set to low-speed access in the opposite direction (approximately 30
m5ec) After suppressing the overrun caused by the inertial force of the motor, the regeneration state is immediately shifted to the FF direction.

Here, Figure 3 shows the flowchart 1 of the above-mentioned high-speed search.
・In this case, the digital value "1." is recorded as the 5-ID indicating the beginning of the song, and the other digital values are 1.
o".

In addition, FIGS. 4 and 5 show other high-speed search examples.
The figure shows the part after 5-IDI7)i (point F), which shows the beginning of the target song, in the high-speed access state in the REW direction, and the 5-ID is recorded from point A to point F. midpoint F
The point shows the case where the state is switched to the low continuous access state (-10 times) in the REW direction.In this case, point A of 5-ID is detected and the state is shifted to the regeneration state at fish C. Also, Figure 5 shows RE
Detect the last part of 5-ID (point F) indicating the beginning of the target song in the state of high-speed access in the W direction, then overrun the A point and perform low-speed access in the FF direction at point 0. In this case, it detects 5-ID at point A, switches to low-speed access state in the REW direction at point 0, detects point A again, and shifts to playback state at point 0. I can do it.

(G) Effects of the Invention As described above, according to the present invention, when transitioning from a low-speed access state to a playback state due to the end of a high-speed search, the capstan motor is once set for reverse access, and then the playback state is entered. Since it is possible to change the playback state to -3 immediately, the search time can be shortened.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of the R-DAT system used in the present invention, Fig. 2 is a diagram for explaining high-speed search, Fig. 3 is a flowchart thereof, and Figs. 4 and 5 explain other examples of high-speed search. This is a diagram of the end. (13)...Subcode processing circuit, (14) (15)
... Reel motor, (19) ... Capstan motor, (21) ... Control circuit.

Claims (1)

[Claims] (1) In a rotary head tape recorder, a servo signal for tracking control and a search signal for high-speed search are recorded together with information signals such as audio on the tape, and this search signal is used to perform high-speed search. The search is performed by high-speed access by tape reel drive and low-speed access by tape pinch roller/capstan drive, and when the high-speed search ends and the transition from the low-speed access state to the playback state occurs, the capstan is temporarily accessed in the reverse direction. A high-speed search method for a rotary head tape recorder that is characterized by shifting to the playback state after setting the motor.