JPH01158652A - Reproducing device - Google Patents

Abstract

PURPOSE:To shorten a music selecting time and to simplify a sequence by executing a forward-feeding mode for a fixed time first, executing a backward- feeding mode next and moving to a reproducing mode by the detection of the head of a circumference signal. CONSTITUTION:A system controller 26 detects the program start signal of a corresponding music by the information of an error correcting circuit 20. Respective motors are controlled through a drum servo circuit 30, a reel driving circuit 32 and a capstan servo circuit 35 and a total-feeding mode or a rewinding mode is switched to the forward-feeding mode. The forward-feeding mode is executed for the fixed time, after that, it is switched to the backward-feeding mode, while executing it, the fall of the program start signal from the circuit 20 is detected, it is switched to the reproducing mode and a music selection is terminated. In this way, the music selecting time is shortened and the music selecting sequences from the fast-feeding and the rewinding modes are made the same and can be simplified.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a playback device for playing back a cassette tape on which audio signals and the like are recorded, and particularly relates to sequence control.

[Conventional technology]

Digital audio tape recorders (hereinafter referred to as DAT) have fixed head type (hereinafter referred to as 5-DAT) and rotating head type (hereinafter referred to as R-DAT).
5-DAT uses a multi-track fixed head to record signals on a number of tracks parallel to the tape's longitudinal direction, while R-DAT uses a rotating head to record signals along the tape's longitudinal direction by helical scanning. This method records signals on tracks diagonal to the direction. When recording music or other information using DAT, a PCIVI music signal is recorded, as well as a subcode including a program number, position information such as time code, and other necessary auxiliary data. Based on this subcode, it is possible to know the position of the tape during playback, and it is also possible to locate the beginning of a mop in search mode. For example, R-D
When recording music using AT, it is recorded according to the track format and block format shown in FIGS. 5 and 6. In this case, a subcode including a program number, position information such as a time code, and other necessary auxiliary data may be recorded at the same time. As shown in Figure 5, one track consists of 196 blocks,
Centering around the PCM audio data recording section, there are ATF periods on both sides in which biloft signals for tracking are recorded, and further outside the ATF periods there are subcode periods for recording auxiliary data. Each of the PCM period and subcode period has a PL for synchronization.
In addition to the L period, a gap is provided between the PCM period and the subcode period, and by matching the timing of recording and playback mode switching to this gap, the PCM audio signal or subcode signal is recorded independently. be able to. Note that the numbers shown in FIG. 5 indicate the number of blocks in each period. As shown in Figure 6A, 1
A block consists of 288 bits, and is provided with an 8-bit identification code (ID code) and a block address code, as well as an 8-bit parity code, which is used to store 256-bit data (PCM data or subcode data). It is designed to follow.

Further, as shown in FIG. 6B, the MSB of the block address code is I'o'' in the PCM block, and t1'' in the subcode block.

The ID code in the PCM domain represents the use of audio, emphasis characteristics, quantization characteristics, sampling frequency, number of channels, etc. Further, in the subcode area, a program start signal indicating the beginning of the recorded program, a program number, etc. are displayed. At the beginning of each program, a program start signal and a program number are recorded for 9 seconds and used.

Next, the sequence of the conventional music selection method will be explained with reference to FIG.

When selecting a song from a tape fast forward (hereinafter referred to as FF) state of 20 times or more, the falling edge of the program start signal of the relevant song (point in Figure 2) is detected and the tape is moved backwards at a speed of 1 to 19 times (FF). After detecting the falling edge of the program start signal (point a in FIG. 2), that is, the beginning of the song to be selected, the mode is set to playback (hereinafter referred to as PB) and the song selection ends.

On the other hand, tape rewinding at a speed of 20 times or higher is hereinafter referred to as FR. ), when the program start signal of the corresponding song falls (point C in Figure 2), that is, the beginning of the selected song is detected, and the tape is first fed at a speed of 1 to 19 times (hereinafter referred to as CUE). , detect the falling edge of the program start signal of the selected song (point d in Figure 2) and RE
The V mode is set, and after detecting the fall of the program start signal again (point C in FIG. 2), that is, the beginning of the selected song, the PB mode is set and the song selection ends.

[Problem that the invention seeks to solve]

However, in such a conventional song selection sequence, when selecting a song from the FF mode, the point at which FF ends, that is, the point at which the FF mode is switched to the REV mode, is not at point a in FIG. 2 but at point b; When selecting music from mode, the point where FR mode ends, that is, the point where you switch from FR mode to CUE mode, is not point d in Figure 2, but point 0, and the point where you end CUE mode, that is, switch from CUE mode to REV mode. The disadvantage is that it takes extra time to select a song, such as after detecting point d in FIG. In addition, you can select songs from FF mode and FR mode.
There was also the problem that the song selection sequence was complicated because the sequence from the end of R mode to PB mode was different.

This invention was made to solve the above-mentioned problems, and it eliminates extra time when selecting songs, and also improves the song selection sequence by making the sequences from FF mode and FR mode to PB mode the same. The purpose of this invention is to obtain a playback device that is simplified.

[Means for solving problems]

The playback device according to the present invention is configured to detect a program start signal of a desired song, execute CUE mode for a certain period of time, and then shift to PB mode after detecting the beginning of the program start signal in REV mode. It is.

[Effect]

When selecting a channel, when the playback device detects the program start signal of the desired song, it runs in CUE mode for a certain period of time, then runs in REV mode, and when it detects the beginning of the program start signal again, shifts to PB mode. It turns out.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described in detail based on FIGS. 1, 3, and 4. First, the principle of the present invention will be explained with reference to FIG. 3, the sequence from FF and FR to PB. When selecting a song, regardless of whether it is from the FF%FR mode, when the program start signal of the desired song is detected, the CUE mode is set. That is, from FF mode, it is between points a and b in Figure 3, and from FR mode, it is between point c in Figure 3.

A point between points d is detected and the CUE mode is executed for a certain period of time. If the CUE mode is executed when selecting a song from the FR mode, when the program start signal of the confession is detected and the CUE mode is selected, the state shown in FIG.
If it exceeds the point, this is a protection to return it to at least 0 point. Although the CUE execution time differs depending on the device including the mechanism, an appropriate time may be set depending on the device. After executing CUE mode, change to REV mode, detect the falling edge of the program start signal, and start PB.
mode. In other words, from FF mode, Fig. 3a
From the point FR mode, the beginning of the song is detected from point C in FIG.

FIG. 1 shows a configuration diagram of a playback device according to the present invention, in which the rotating heads (11A) and (11B) obtain playback output from a magnetic tape a wound on a reel. is supplied to amplifiers (15A) (15B), and each output of this amplifier QsA) (15B) is connected to a switch circuit Q.
Q is supplied. The switch circuit QQ uses a switching signal of 33.3 + (z) from the timing signal generation circuit 00 to generate a half-rotation period including the tape contact period of (uA) and a half-rotation period including the tape contact period of the head (IIB). The output signal switched by the switch circuit αQ is then supplied to the error correction circuit through the equalizer αη, the comparator (G), and the PLL circuit α field, which constitute the electromagnetic conversion system. Error correction is performed as necessary at the digital-to-analog converter υ, where the digital signal is converted into an analog signal, and then the original signal is sent to the output terminal Q through a low-pass filter (4). It is extracted at 1° with the analog signal.Also, if you want to directly extract digital data, it can be derived from the output terminal (to) of the error correction circuit (1). A system controller (7) serving as an interface is provided on the output side, where subcode information including a program start signal, time code, etc. is extracted and displayed on a display section (a) as necessary. Multiple keys (not shown) required for operation on the controller (7)
is provided to control the entire system. 3 is a drum servo circuit controlled by the system controller (1), and this drum servo circuit (7) rotates a drum (not shown) to which a rotating head (IIA) (IIB) is attached. The drum motor 6υ is controlled. A reel drive circuit (2) is provided for the reel 0 (to), and a drive signal from this reel drive circuit (g) is supplied to the reels (6) (to) through the reel motor iron (b), respectively. be done. The reel drive circuit (2) changes the level of the drive signal applied to the reel motors (g) and (b) in response to a mode switching signal from the system controller (to). (b) is a capstan servo circuit controlled by the system controller (a), and this capstan servo circuit (to) controls a capstan motor (b) that rotationally drives the capstan (to). Further, a pinch roller (not shown) and a plunger circuit for controlling the pinch roller against elastic force are provided for the capstan.

Next, the basic operation of music selection in this invention will be explained. The system controller (1) obtains information from the error correction circuit (a), detects the program start signal of the self-portrait, and controls the drum servo circuit (to) and the reel drive circuit Q1 capstan servo circuit (to). The FF mode or the FF mode is changed to the CUE mode by changing the drive signal level applied to each motor. After executing this CUE mode for a certain period of time, it is switched to REV mode. During REV execution, input the program start signal from the error correction circuit (1), detect its falling edge, and
Set to B mode and end song selection. A flowchart of such an operation is shown in FIG.

First, when a program start signal of a desired song is detected in step (1), the FF mode or FF mode is changed to CUE mode in step (2). Execute the CUE mode in step (3) for, for example, 2 seconds, then step (
4) to set to REV mode. When the REV mode is selected, the fall of the program start signal, that is, the beginning of the song is detected in step (5), and the PB mode is selected in step (6), and a series of song selection operations are completed.

In the above embodiment, when changing from FF mode or FF mode to CUE mode, the CUE mode time may be shortened or omitted if the program start signal is t1''.

Further, although this embodiment has been described only for a reproducing device, it can also be applied to a reproducing device having a recording function.

〔Effect of the invention〕

As described above, according to the present invention, the song selection sequence is changed from FF or FF mode to REV mode after CUE mode is executed for a certain period of time, and P is changed to REV mode at the beginning of the program start signal.
By configuring the B mode, it is possible to shorten the song selection time, and since the song selection sequence from the FF mode and the FF mode can be the same, the sequence can be simplified, and the program This has the effect of shortening creation time and depacking time, and reducing program capacity.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a diagram for explaining the conventional principle, FIG. 3 is a diagram for explaining the invention in detail, and FIG. 4 is a diagram for explaining the invention. Flowcharts, FIGS. 5 and 6, for explaining the basic operation of
It is a diagram showing the tape format of R-DAT. In the figure, αri (2) is the reel, a4 is the magnetic tape, (4)
is the error correction circuit, @ is the system controller, @ is the display, ■ is the drum servo circuit, 0υ is the drum motor (a)
(g) (b) is the reel motor, (to) is the capstan servo circuit, and (b) is the capstan motor.

Claims (1)

[Claims] A main signal such as audio information or video information and a subcode signal containing address information such as a program number and a program start signal are detected and reproduced from a recording medium in which these recorded signals are recorded. A system controller includes a drive device that runs the medium at a plurality of different predetermined speeds, and a system controller that controls the drive device to detect a desired program number and a program start signal, thereby reproducing the desired program. The recording medium is run in a fast forward or rewind state, and when a program start signal of a desired program is detected, the recording medium is run in a predetermined direction for a predetermined time at a speed slower than the fast forward speed or rewind speed, and then reversed again. 1. A playback device characterized in that the playback device is configured to run and then shift to a playback state when the beginning of a program start signal is detected.