JPH0675349B2 - Disc player - Google Patents

Description

TECHNICAL FIELD The present invention relates to a disc player such as a video disc player and a digital audio disc player.

<Prior Art> Disk systems include digital audio disk systems and video disk systems, and there are several methods such as optical methods and electrostatic capacity methods in video disk systems. Below, the VHD method will be described. explain.

Figure 1 shows a VHD video disc. Disk 1
In, a signal is recorded between the track guard 2 at the center and the track guard 3 at the outside. This recording section is
A lead-in section 4 following the outer track guard 3, a wide program section 5 following the lead-in section 4, and a lead-out section 6 following the program section 5 are divided.

The lead-in section 4 is a portion where the reproducing needle first descends at the start of the performance, and a signal is recorded so that the program can be quickly searched for. The player, while reading this signal, sends the needle tip across the track at high speed to the start position of the program to enable quick cueing.
On the other hand, a signal indicating the end of the program is recorded in the lead-out section 6, and the needle tip can automatically end the reproduction, return to the standby position, and automatically stop the performance. In the programming section 5, video and audio signals are recorded, and a single disc can reproduce for two hours (maximum) on both sides for a long time. In this section, in order to ensure correct reproduction, a tracking signal (index signal, tracking signal) and an image signal are correlated with an address signal (consisting of a time signal, a track number signal, a chapter number signal, etc.) The signal called is also recorded at the same time. With these signals, special playback such as quick motion or slow motion and high-speed random access search that can find a desired place in a few seconds can be easily performed.

However, the address signal may be inconvenient because it is recorded only on the 17th, 18th, 280th, and 281th lines of the vertical blanking period of the video signal. To give an example, the length of the program on a disc that can record up to 1 hour on each side
Suppose that only 30 minutes were recorded. If the operator plays this video disc without knowing this fact and issues a random access command at the 35th minute with the operation keys of the player, the player searches for the target track while detecting the address signal, but at the 35th address. Since the signal is not recorded, searching is impossible. In this case, the needle tip enters the lead-out section and automatically returns to the standby position or returns to the original address position by detecting that the search is impossible. The operator, who knows this, thinks it is a detection error on the player side and repeats the search command as many times as necessary. As described above, there is a problem that it is not possible to determine the suitability for player operation such as a search only by recording the address signal in correlation with the video signal.

<Object of the Invention> Therefore, an object of the present invention is to provide a disc player capable of automatically and instantaneously determining the suitability of an operation such as a search on the player side.

In order to achieve the above object, the present invention provides a lead-in data detecting means for detecting data recorded in a lead-in section of a disc in a disc player for reproducing a disc in which data relating to a program is recorded in a lead-in section. And a lead-in data storage means for storing the detection data of the lead-in data detection means, a setting data and / or a command signal given from the player operation section, and the stored data of the lead-in data storage means. At least the operation suitability judging means for judging suitability of the operation in the section, the record data of the lead-in section is detected by this player, the detected data is stored, and the suitability of the search operation is judged based on the stored data. To do.

Preferably, a display means capable of editing and displaying the stored data of the lead-in data storage means in an appropriate form is provided, and information for operator confirmation is provided constantly or as necessary.

More preferably, when the operation suitability determination means determines that the operation is not suitable, the operator is notified of this by lighting or blinking a light or by a sound.

Hereinafter, the present invention will be described in detail based on the illustrated embodiments.

<Example> The video disc of the example has a lead-in section 4 (first
Using the empty track shown in the figure), following the recording portion of the lead-in signal used for cueing the program, record the data related to the program recorded on the video disk (called lead-in data) in the form of digital signal. It was done. In the data related to the program, that is, the lead-in data, whether the program is singular or plural,
One program is minutes and seconds from the program start, what is the trunk number of the beginning and end of the program, chapter number indicating the program and the nail of the song, where is that position, etc. and the voice of each song is bilingual It also includes signals for distinguishing between stereo, stereo, and monaural. These signals are recorded at the time of making a disc master.

Next, a block diagram of FIG. 2 shows an outline of a player system for reproducing the video disc on which the lead-in data is recorded.

1'is a video disc on which lead-in data is recorded, 2
Is a stylus as a reproducing needle, 3 is a stylus drive device, 4 is a main motor servo device for controlling the rotation of a disc, 5 is a pickup device, 6 is a slide motor servo device for controlling the pickup device 5, and 7 is a picked up signal. A preamplifier 8 for amplifying the stylus drive device 3 or the slide motor servo device 6 based on a tracking signal extracted from the output of the preamplifier 7.
Tracking servo circuit for giving a signal to the circuit to perform tracking control, 9 is an audio signal processing circuit to which the output of the preamplifier 7 is input, 10 and 11 are audio output terminals to which reproduced audio signal channels 1 and 2 are output, and 12 Is a video signal processing circuit, and the reproduced video signal is output to the video output terminal 13. Reference numeral 14 is a time base servo circuit that applies a signal to the stylus drive device 3 based on the output of the video signal processing circuit 12 to correct the fluctuation in the time axis direction.

Reference numeral 15 is an input of the reproduction signal of the video signal processing circuit 12, and from this signal, a lead-in signal recorded in the lead-in section, a lead-in data signal, an address signal recorded in each track of the program, and a lead-out section are input. A data detection circuit for detecting and extracting the recorded lead-out signal. The data detected by the data detection circuit is input to the control device 16 of the system. The control device 16 contains a microcomputer 16a (the microcomputer is abbreviated as "MPU"). MPU16a is
Random access memory (RAM) 16b, read only memory (ROM), CPU, registers, I / O interface, etc. are included inside, and various operations and judgments can be executed by the software program stored in ROM. it can. The control device 16 includes the data detection circuit.
The detection data of 15, the setting data by the key operation of the operation unit 17 of the player, the command signal, and the state data of the micro switch group 19 provided in the mechanism unit related to the disc loading are mainly input. The input data is selectively stored in the RAM 16b of the MPU 16a. The lead-in data is stored in a predetermined area of the RAM 16b, and the data set by the numeric keypad of the operation unit 17 is also stored in another storage area of the RAM 16b. And
The result processed by the MPU 16a based on the above data or signal is selectively given to each of the stylus drive device 3, the main motor servo device 4, and the slide motor servo device 6 as a control signal, and a predetermined operation is executed.

The operation section 17 is provided with a plurality of indicators 17a for displaying the operating state of the player, for example, the operation mode and the program number being reproduced, and for displaying and confirming whether or not the key operation has been surely performed. . Indicator 17a
Lights up or blinks according to a signal from the control device 16. In addition, in the case of the present embodiment, a small piezoelectric speaker (including a piezoelectric buzzer) is provided in a part of the operation unit 17 so that the operator is immediately notified of an operational error. Is also preferable. This is because audio is more reliable than visual observation. Reference numeral 18 denotes a display unit for editing and displaying the lead-in data detected by the data detection circuit 15 and stored in the RAM 16b in an appropriate form.
It is provided in connection with. The display unit 18 can be always displayed while the player is operating, but the display may be made to appear if necessary. By doing so, the contents of the reproducible programs can be listed, and reliable and quick key operation can be performed.

Next, the main operation of the player system of FIG. 2 will be described with reference to the flowchart of FIG.

First, the player is powered on and started. When the power is turned on, the MPU16a of the control device 16 makes initial settings,
Wait for video disc loading and playback key input. When the reproduction key is operated, the specific storage area of the RAM 16b is cleared, the reproduction mode is instructed, and the stylus 2 descends to the lead-in section. When the lead-in signal for program cue detection is detected, the lead-in data is subsequently detected in step SP1 by using this signal as a trigger.
The detected data is stored in a predetermined area of the RAM 16b in step SP2. As a result, all necessary information such as the playing time of the program recorded on the disc, the total time of the program area, and the recording position of the program can be obtained. Then, in step SP3, the normal reproduction mode is commanded.

In step SP4, it is determined whether the random access search command is issued. If not instructed, the process branches to determine whether the program end signal (recorded in the lead-out section) is detected. If not detected, the process returns to the normal reproduction command step SP3. If detected, the reproduction operation is automatically stopped.

When the random access search is instructed, the lead-in data previously stored in the next step SP5 is read. In step SP6, the target position or time data previously set in step SP4 is compared and calculated with the lead-in data, and the suitability of the key operation is judged. If they do not match, the process immediately proceeds to step SP7, and the indicator 17a of the operation unit 17 displays "error". Alternatively, when a piezoelectric speaker is provided, an alarm is sounded. When the operator corrects the error, step SP3
Return to. When it is determined that the settings for random access search and command operations are suitable, the control device 16
A predetermined control signal is output from the device, a random access search is correctly executed, and normal reproduction is performed on the searched target track.

It should be noted that the video disc player for executing the method of the above embodiment is not only for reproducing the video disc on which the lead-in data is recorded.
That is, a disc in which only a lead-in signal for cueing is recorded in the lead-in section can also be reproduced. In this case, steps SP1, SP2, SP5, SP6 of FIG. 3 are not applied.

Further, the above embodiment has been described by taking the VHD system as an example.
The techniques disclosed herein are equally applicable to optical MCA systems or capacitive CED systems or digital audio disc systems. In the case of the optical type, the reproducing needle is a light beam and the lead-in section is on the inner peripheral side of the disc.

<Effects of the Invention> As described above, the disc player of the present invention reproduces the disc in which the data relating to the program is recorded in the lead-in section, stores this data, and judges the suitability of the operation based on this stored data. Since it is configured as above, there is an effect that the operability of the player can be improved.

[Brief description of drawings]

FIG. 1 is a diagram showing a video disc, FIG. 2 is a block diagram of a video disc player according to an embodiment, and FIG. 3 is a flow chart for explaining the operation of the player. 1,1 ′ …… Video disc, 4 …… Lead-in section, 15
... Data detection circuit, 16 ... Control device, 16a ...
… Microcomputer, 16b …… RAM of the microcomputer, 17 …… Operating section.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP-A-57-50375 (JP, A) JP-A-56-11668 (JP, A) JP-A-53-95602 (JP, A) JP-A-57- 147175 (JP, A)

Claims (1)

[Claims] 1. A lead-in data detecting means for detecting data recorded in a lead-in section of a disc in a disc player for reproducing a disc in which data relating to a program is recorded in a lead-in section, and this lead-in data detection. Based on the lead-in data storing means for storing the detection data of the means, the setting data and / or the command signal given from the operating portion and the stored data of the lead-in data storing means, the suitability of the operation in the operating portion is judged. A disc player comprising: an operation suitability determination means; and an informing means for informing an operator of the determination result of the operation suitability determination means.