JPH0357552B2 - - Google Patents

Description

[Detailed Description of the Invention] [A. Field of Application] The present invention can be employed in a disc player for playing back discs on which song numbers and the like are recorded in addition to music information. It relates to a track beginning device. [B Background of the Invention] Recently proposed digital audio disks include control signals (subcodes) such as the song number of the currently playing song and a signal indicating the presence or absence of sound, in addition to music information on the recording track. signals) are recorded.
A player playing such a disc can use this subcode signal to search for the starting position of a song specified by the operator and play it back (random access). [C. Disadvantages of the Prior Art] By the way, when performing random access, it is necessary for the operator to set the song number by key-inputting the number of the song to be searched. However, if you want to listen to the currently playing song again, or if you want to listen to only the first parts of a plurality of songs one after another, it is troublesome to set the song number each time. [D. Purpose of the Embodiment] Therefore, the present invention aims to enable new random access by adding or subtracting a fixed value to or from the song number of the song currently being played. In other words, if the constant value is "1", then "1"
Random access to the next song by simply adding
Furthermore, it is intended to enable random access to the previous song simply by subtracting "1". Furthermore, random access to the same song is made possible by adding a constant value of "0". [E] Configuration of the present invention A currently played song number setting circuit is provided in which the song number of the currently played song is set, and a constant value (0) is set for the song number set in this currently played song number setting circuit.
), and the added and subtracted value is used as a new song number for cueing the song. [Embodiment of the present invention] In FIG. 1, 10 is a circuit for starting the song, 2 is a latch circuit, 3 is a monostable circuit, 4 is a currently playing song number setting circuit, and S is a switch for starting the song. It serves both as a song number setting means and a cue start instructing means. The END output of the cue circuit 10 is at a high level during disc playback. The currently played song number setting circuit 4 is set with the song number Z of the currently played song detected from the disc. If you want to listen to this song again, set the switch S to the a side, and if you want to proceed to the next song, set the switch S to the b side. When set to the a side and terminal A becomes low level, the currently playing song number setting circuit 4 outputs the value Z as is as Y (adding "0"), and when set to the b side, terminal B becomes low level. Then, “1” is added to the value Z (Z+1) as Y
Output as . On the other hand, when the switch S is set to the a side or the b side, the output C of the gate 5 becomes high level.
In response to the rise of the output C, the monostable circuit 3 is triggered, and the Q output becomes high level during the quasi-stable period. In response to the rising edge of the Q output, latch circuit 2
Y is latched, and this latch output X (X=Y)
is applied to the cue circuit 10 as the song number to be newly cued. Then, after the quasi-stable period has elapsed, when the output rises, this rise becomes a signal ST instructing the cueing circuit 10 to start the cueing operation, and the cueing operation is started. That is, when the switch S is set to the a side, the cue operation is performed for the same song that has been played up to that point, and when it is set to the b side, the next song is searched. FIG. 2 is a diagram showing a specific example of the cue circuit 10 . The song number reading circuit 11 is a circuit for reading out the song number N from the subcode signal during random access, and the silence signal reading circuit 12
Similarly, the silence signal P is selected from among the subcode signals.
(Signal indicating the silent part immediately before the start of each song)
This is a circuit for reading out. The coincidence detection circuit 13 is
When it is detected that the song number N matches the song number X to be cued, the output D becomes high level. The comparator 14 compares the values of N and X, and when N≧X, its output E is high level;
<X, the output E becomes low level. The flip-flop circuit 15 operates at the falling edge of the clock input pulse. The feed motor control circuit 16 is
This is to control the feed motor for moving the pick-up in the semi-radial direction of the disk for reading information from the disk, and when the output F of the circuit 15 is at a high level, the output E of the circuit 14 is at a high level. At this time, the feed motor is controlled so that the pickup moves backward, and so that the pickup moves forward when the output E is at a low level. In addition, during normal playback, F
When the output is at a low level, the feed motor control circuit 16 controls the feed motor using the tracking control signal T from the tracking servo system. Now, when the switch S is operated and the start signal ST rises, the flip-flop 15 is preset by the signal ST, the output F becomes high level, and cueing is started. That is, depending on the state of output E, the pickup moves forward or backward. Then, when the output E falls from the high level to the low level, that is, when the pickup passes the beginning of the song number X to be cued, the flip-flop 15 is triggered, and the output F is The output becomes low level, and control of the feed motor based on the output E ends. Thereafter, the normal reproduction state is established, and the feed motor is controlled based on the tracking control signal T. Thereafter, the coincidence circuit 13 detects N=X, the output D becomes high level, and the signal P indicating silence becomes high level. Then, since the output of the gate 17 is already at a high level, all three inputs of the gate 18 are at a high level, and the END signal becomes a high level, thereby completing the cueing operation. [Effect] A new song number for cueing can be set by adding or subtracting a certain value from the currently played song number, so it is possible to cue the song extremely easily.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a cueing device of the present invention, and FIG. 2 is a diagram showing a specific example of a song cueing circuit. 4 is a currently played song number setting circuit; 10 is a cueing circuit; and S is a switch (beginning song number setting means and cueing start instructing means).

Claims (1)

[Scope of Claims] 1. A song cueing device for a disk player having a cueing circuit that cues the beginning of a song by using the song number information modulated and recorded on the disk and silence information between songs. There is a currently playing song number setting circuit in which the song number of the currently playing song is set, and a new one for cueing by adding or subtracting a certain value to the song number set in this currently playing song number setting circuit. a cueing song number setting means for creating a cueing song number; a high-speed feeding means for feeding the pick-up at high speed in the radial direction of the disk in response to a signal instructing the start of cueing operation; The number N is compared with the song number X set in the cue song number setting means, and when the song number N≧the song number Comparing means for setting the high-speed feeding direction of the pick-up in the direction in which the song number increases when song number What is claimed is: 1. A song cueing device comprising: a switching device for switching to a song cue; and a song interval detecting device for terminating song cueing by reading silence information between songs during such low-speed forwarding. 2. The song cue number setting means doubles as cue start instructing means for instructing the cue circuit to start cueing operation. Cue device.