KR19980061997A - Search speed and time display circuit of optical disc - Google Patents

Abstract

The present invention is to display the search speed and the estimated search time required for the search of the entire song when searching the songs contained on the optical disk to solve the user's question about the search speed and time for each disk

The search speed and the search time are different for each optical disc, thereby eliminating a problem that is difficult for a user to recognize.

In the present invention, an optical disk reproducing apparatus includes a control IC for recognizing the output of an RF amplifier and outputting a pulse for moving one track of the optical disk, and having a buffer for shaping the pulse of the control IC. And a display unit for displaying the search speed and the search end time calculated by the microcomputer after providing a microcomputer for calculating the search speed and the search end time using data of the TOC (Table of Concert) area.

Description

Search speed and time display circuit of optical disc

The present invention relates to an optical disc reproducing apparatus for reproducing an optical disc. The search speed for each optical disc is different at the time of the music search of the optical disc, so that the user cannot predict the estimated time until the end of the search.

If the same optical disc is searched on the same playback device, the search operation is completed over the same time at the same speed, but if the optical discs are different or the playback devices are different, the search time depends on the contamination status of each optical disc and the pickup degree of the playback device. Will make a difference.

In general, when searching for an optical disk of the same diameter, it takes almost constant speed and time, but as shown in FIG. 2, the distance between the pit P1 and the pit P1 of the optical disk is 1.6. If m is constant but the optical disk is contaminated, the pulse width T2 generated when the optical disk is over one pit as shown in Fig. 2B is different from the pulse width T1 (see Fig. 2A). It is considerably longer than that.

Therefore, since 20,000 tracks are recorded on the optical disk as a whole, there is a significant time difference when searching for a contaminated optical disk and when searching for an optical disk otherwise.

However, at present, the search speed and search end time are not displayed. Therefore, it is not possible to know at which speed and how much time should the search be completed.

In particular, the search speed is different depending on the condition of the optical disk, which is why there is a big question about the estimated end time of the search.

The present invention is to display the search speed and the search end time when the music search of the optical disk to solve the user's curiosity and to increase the reliability of the product

An optical disc reproducing apparatus for picking up data stored on an optical disc by an optical pickup and amplifying the RF disc with an RF amplifier, comprising: a control IC for recognizing the output of the RF amplifier and outputting a pulse for moving one track of the optical disc, and shaping the pulse of the control IC. After the microcomputer calculates the search speed and the search end time using the pulses shaped in the buffer and data of the TOC (Table of Concert) area, the search speed and the search end time calculated by the micom are calculated. It is made by providing a display unit for displaying the.

The present invention, after recognizing the radius and the total number of tracks of the optical disk recorded in the TOC area of the optical disk, calculates the search speed and the search end time of the optical disk using the pulse time generated during one track search of the optical disk and then displays it. The user can recognize the search speed and the search end time when searching the music on the optical disc.

1 is a circuit diagram of one embodiment of the present invention.

2 is a pulse waveform diagram generated when detecting a pit

Explanation of symbols on the main parts of the drawing

10: optical disk 20: optical pickup 30: RF amplifier

40: control IC 50: buffer 60: microcomputer

70: display unit

1 is a circuit diagram of one embodiment of the present invention.

The data recorded on the optical disc 10 is picked up by transporting the optical pickup 20, and the signal picked up by the optical pickup 20 is amplified by the RF amplifier 30 and then converted into a pulse waveform by the control IC 40. Configured

The pulse waveform of the control IC 40 is configured to be waveform-formed in the buffer 50 and then applied to the microcomputer 60. The microcomputer 60 uses the pulse waveform and data of the TOC region to search the search speed and the search end time. After the calculation, the display unit 70 displays the calculation data of the microcomputer 60.

Here, the TOC area refers to a portion that stores data at the innermost circumference of the disc so that the time, number of tunes, etc. of the disc can be known when the optical disc 10 is read in.

In the present invention, the radius of the optical disc 10 and the number of tracks recorded on the optical disc are read in the TOC area and used as necessary data for calculating the search speed and the search end estimated time.

When the optical disc 10 is searched for in the optical disc reproducing apparatus, the optical pickup 20 scans each track while receiving the light reflected from the pi by scanning a laser beam on the surface of the optical disc 10. The signal picked up by the pickup 20 is amplified by the RF amplifier 30.

The signal amplified by the RF amplifier 30 is applied to the control IC 40 to output a pulse according to the state of the optical disk 10 as shown in FIG. 2A or 2B. The pulse generated in 40 is waveform-shaped in the buffer 50 and then applied to the microcomputer 60.

At this time, one pulse is applied to the microcomputer 60 every time the optical pickup 20 goes one track.

Therefore, in the microcomputer 60, the search speed can be calculated using the applied pulse, and the time required to apply one pulse is calculated and divided by the radius of the optical device 10 read in the TOC region.

V = Where the relation V is the feedrate, Is the radius of the optical disk, and T is the time when one pulse is applied.

Since the feed rate calculated by the microcomputer 60 is converted into a display signal and is applied to the display unit 70, the display unit 70 displays the search time during the music search to solve the user's question about the search speed.

On the other hand, the microcomputer 60 checks the pulse applied through the buffer 50 at the time of the music search, calculates the average time until the optical pickup 20 searches for about 10 tracks, and reads it from the TOC area. The number of tracks can be used to calculate the estimated end time of the search.

In other words, the estimated end time of search (T _E ) is calculated by the relation of T _E = Tref × T _N , where Tref is the normal time for pulse input of about 10 tracks, and T _N is the total number of tracks recorded on the optical disc (about 20,000).

Therefore, when the search operation of about 10 tracks is executed, the microcomputer 60 may calculate the search end estimated time for the optical disc 10, and the calculated search end estimated time is converted into a display signal to the display unit 70. Is authorized.

Accordingly, when the search of about 10 tracks is performed on the display unit 70, the search end time is displayed and the user can recognize the estimated time until the end of the search of the optical disc 10.

The present invention displays the current search speed and the estimated end time of the search on the display unit during the music search of the optical disc, thereby solving questions about the different search speed and the estimated end time of the search for each disc and improving the quality of the product. do.

The present invention is to display the search speed and the estimated search time required for the search of the entire song when searching the songs contained on the optical disk to solve the user's question about the search speed and time for each disk.

Claims (3)

In the optical disc player for reading the data recorded on the optical disc, A control IC that outputs a pulse that moves one track during music search, A buffer for shaping the pulse output from the control IC, A microcomputer that calculates the search speed and the search end time using the output of the buffer and the data of the TOC area; A search speed and time display circuit of an optical disc, characterized in that the display unit for displaying the search speed and the search end estimated time calculated by the microcomputer. The search speed and time display circuit of an optical disc according to claim 1, wherein the microcomputer counts the pulse time applied from the control IC and divides the changed value of the optical disc by the counted time to calculate the search speed. In claim 1, the microcomputer checks the pulse applied from the control IC to calculate the average search time of 10 tracks, and then multiplies the calculated average search time by the number of tracks recorded on the optical disk to calculate the search end estimated time. A search speed and time display circuit of an optical disc.