KR100202078B1 - Reproducing device for a optical disc - Google Patents

Abstract

The present invention selectively reproduces the audio and video signals of the LD and CD-OK by reproducing an optical disc having CD-OK data recorded thereon.

According to the present invention, an EFM modulated signal is processed by an EFM signal processor, an FM modulated audio signal is processed by an FM audio signal processor, and an FM modulated video signal is processed by an FM video signal. The digital audio signal of the LD in the output signal of the EFM signal processing unit is converted into an analog signal by the analog signal converting means, and then selectively outputs by switching the output signal of the FM audio signal processing part and the first switching means. The CD-OK data is output from the output signal of the EFM signal processor by the CD-OK data processor and then selectively outputs the CD-OK audio signal and the audio signal output by the first switching means. And selectively outputs the video signal of the CD-OK and the video signal outputted from the FM video signal processing means. A video signal is selectively output.

Description

Optical disc playback device

The present invention reproduces an LD in which CD-OK data is recorded together in an area of an LD (Laser Disk) for recording an EFM-modulated digital audio signal. An optical disk reproducing apparatus for selectively outputting video signals.

In general, LD is capable of recording and playing back audio signals as well as video signals, and is robust, and the recorded data is not easily damaged, and the recorded data can be reproduced without noise by using a laser. Its use is gradually increasing.

1 is a format showing a relationship between a frequency at which an audio signal and a video signal are recorded in an LD. As shown in the figure, the digital voice signal modulated by EFM (Eight to Fourteen Modulation) is recorded in a band of 2 MHz or less, and the L and R channel analog voice signals modulated by frequency modulation (FM) are 2.3 MHz and 2.8 MHz as the center frequency. The video signals are FM-modulated and recorded at a blanking level of 8.1 MHz.

In the conventional optical disc reproducing apparatus for reproducing an LD having such a format, as shown in Fig. 2, a pickup section 2 for reproducing data recorded in the LD 1 and a reproduction signal of the pickup section 2 are provided. A low pass filter 3 for detecting an EFM modulated digital voice signal, an EFM signal generator 4 for demodulating the output signal of the low pass filter 3, and an output of the EFM signal generator 4 Digital signal processing (DSP) unit 5 for processing signals, digital / analog converting unit 6 for converting the output signal of the DSP unit 5 to analog signals, and reproduction signals of the pickup unit 2 A band pass filter (7) (8) for detecting analog voice signals of the L channel and the R channel modulated with the FM signal, and an output signal of the band pass filter (7) (8) and the FM demodulator (9). And a filter 10 for filtering the output signal of the FM demodulator 9 and an output of the digital / analog converter 6 and the filter 10. A switching switch (11) (12) for selectively outputting a signal, a band pass filter (13) for detecting an FM-modulated video signal among reproduction signals of the pickup section (2), and the band pass filter (13) An FM demodulator 14 for FM demodulating the output signal, and an image processor 15 for processing the output signal of the FM demodulator 14 to output an image signal.

In the above, the switching switch (11, 12) is interlocked.

In the conventional optical disk reproducing apparatus configured as described above, when the LD 1 is reproduced, the pickup section 2 reproduces predetermined audio and video data recorded while tracking the LD 1.

The digital audio signal modulated by the EFM among the reproduction signals reproduced by the pickup section 2 is filtered by the low pass filter 3 and demodulated by the EFM signal generator 4.

The output signal of the EFM signal generating section 4 is digitally processed by the DSP section 5, converted into an analog signal by the digital / analog converting section 6, and applied to the switching switches 11 and 12.

Of the reproduction signals reproduced by the pickup section 2, the FM modulated analog audio signal is filtered by the band pass filters 7 and 8 to detect the L channel and R channel audio signals, and the detected L channel and R channel audio signals. The signal is demodulated in the FM demodulator 9, filtered by the filter 10 and then applied to the switch 11, 12.

In such a state, the switching switches 11 and 12 are switched according to a user's selection, so that the switching switches 11 and 12 convert the output signal of the digital / analog converter 6 or the filter 10 into the L channel and the like. R channel audio signal.

The FM modulated video signal reproduced by the pickup unit 2 is detected by the band pass filter 13, demodulated by the FM demodulator 14, and processed after the image is processed by the image processor 15.

However, the above-described conventional disc player can play only LD to output audio and video signals, and thus can not play a CD-OK disc. Therefore, consumers who want to play a CD-OK disc need a separate CD. There was a problem that an OK disc player should be purchased.

An object of the present invention is to reproduce an optical disc in which CD-OK data is stored in a frequency domain in which an EFM modulated digital audio signal of an LD is stored, so that an LD audio signal and a video signal and a CD-OK audio signal and a video signal are reproduced. There is provided an optical disk reproducing apparatus for selectively outputting a.

1 is a diagram illustrating a format of data stored in an LD.

2 is a circuit diagram showing the configuration of a conventional disc reproducing apparatus for reproducing LD.

Fig. 3 is a circuit diagram showing the configuration of the disc reproducing apparatus of the present invention for reproducing LD in which CD-OK data is recorded.

Explanation of symbols on the main parts of the drawings

1: optical disc

2 pickup section

3: low pass filter

4: EFM signal generator

5: DSP unit

6, 65: digital / analog converter

7, 8, 13: band pass filter

9, 14: FM demodulator

10: filter

11, 12, 71, 72, 73: selector switch

15: image processing unit

20: EFM modulated signal processing means

30: FM audio signal processing means

40: FM video signal processing means

50: first switching means

60: CD-OK data processing means

61: CDROM Decoder

62, 64: memory

63: CD-OK for this job

66: video encoder

70 second switching means

In order to achieve the above object, the optical disk reproducing apparatus of the present invention, when reproducing an optical disk, processes an EFM modulated signal from an output signal of the pickup unit by reproducing the optical disk, and the EFM signal processor processes the FM modulated voice signal. The FM signal is processed by the audio signal processing unit, and the FM modulated video signal is processed and output by the FM video signal processing unit, and the digital audio signal of the LD is converted into an analog signal by the analog signal conversion unit in the output signal of the EFM signal processing unit. The output signal of the signal processor and the first switching means are switched and selectively output. The CD-OK data from the output signal of the EFM signal processor is processed by the CD-OK data processor, and then the CD-OK Selectively outputs an audio signal and an audio signal output from the first switching means, and outputs a CD-OK video signal and the FM video signal The processing means selectively outputs an output video signal to selectively output audio signals and video signals of LD or CD-OK.

Hereinafter, the optical disc reproducing apparatus of the present invention will be described in detail with reference to the accompanying drawings of FIG.

Fig. 3 is a circuit diagram showing the configuration of the disc reproducing apparatus of the present invention for reproducing LD recorded with CD-OK data. As shown therein, the pickup section 2 reproduces the LD and CD-OK data recorded on the optical disk 1, and the digital audio signal and CD- of the LD modulated by EFM from the output signal of the pickup section 2; EFM modulated signal processing means 20 for processing OK data, FM audio signal processing means 30 for processing FM signals modulated from the output signal of the pickup section 2, and the pickup section 2 Digital video signal processing means (40) for processing the FM signal video signal modulated from the output signal, and digital / analog conversion means for converting the digital audio signal of the LD output from the EFM modulated signal processing means 20 into an analog signal First switching means 50 for selectively outputting the output signals of the analog converter 6, the digital / analog converter 6 and the FM audio signal processing means 30, and the EFM modulated signal processing means ( 20) Processed CD-OK data output from CD-OK data processing means 60 for separating and outputting the audio signal, audio signal output by the CD-OK data processing means 60 and audio signal output by the first switching means 50 are switched between switch 71, 72 is selectively outputted, and the switching switch 73 switches the video signal output from the CD-OK data processing means 60 and the video signal output from the FM video signal processing means 40. It comprised with the 2nd switching means 70 which outputs.

In the above, the CD-OK data processing means 60 processes the CDROM decoder 61 for decoding the CD-OK data output from the EFM modulated signal processing means 20 and the output signal of the CDROM decoder 61. The audio signal and the audio signal separated by the CD-OK audio part 63 and the audio signal separated from the CD-OK audio part 63 to the analog signal by converting the second switching means (70) A digital / analog converter 65 for outputting a video signal and an image encoder 66 for outputting the video signal separated by the CD-OK logic unit 63 to the second switching means 70 for encoding and outputting the video signal. It was.

In the above, the switching switch 71, 72, 73 is interlocked.

Reference numerals 62 and 64 in the drawing description of FIG. 3 are memories connected to the CDROM decoder 61 and the CD-OK logic part 63 to temporarily store and output data to be processed.

In the optical disk reproducing apparatus of the present invention configured as described above, the pickup section 2 receives signals recorded on the optical disk 1 when the LD, that is, CD-OK data is recorded together, that is, the optical disk 1 is reproduced. Will play and output.

The EFM modulated digital voice signal and the EFM modulated CD-OK data among the reproduction signals output by the pickup unit 2 are filtered by the low pass filter 3 of the EFM modulated signal processing means 20, and the EFM signal generator It is demodulated by (4), and is digitally processed by the DSP unit 5 and output.

As described above, the EFM digital voice signal of the LD among the signals output from the EFM modulated signal processing means 20 is converted into an analog signal by the digital / analog converter 6 and then the switching switch 11 of the first switching means 50. The CD-OK data is input to the CD-OK data processing means 60.

The CD-OK data processing means 60 decodes the CD-OK data input from the EFM modulated signal processing means 20 into the CDROM decoder 61, is stored and output in the memory 62, and is decoded for CD-OK. The audio portion 63 is processed to separate the audio signal and the video signal.

The digital audio signal separated by the CD-OK logic unit 63 is input to the digital / analog converter 65, converted into an analog audio signal, and then input to the second switching means 70. The separated video signal After being encoded in the image encoder 66, it is applied to the switching switches 11 and 12 of the second switching means 70.

On the other hand, of the reproduction signals output from the pickup section 2, the FM modulated analog voice signal is filtered by the band pass filters 7 and 8 of the FM voice signal processing means 30 to detect the L channel and R channel voice signals. The detected L-channel and R-channel voice signals are demodulated by the FM demodulator 9, filtered by the filter 10, and then applied to the switch 11, 12 of the first switching means 50.

In addition, the FM modulated video signal reproduced by the pickup section 2 is detected by the band pass filter 13 of the FM video signal processing means 40, demodulated by the FM demodulation section 14, and by the image processing section 15. The image is processed and then output to the second switching means 70.

In this state, the first switching means 50 and the second switching means 70 are switched to selectively output the reproduction signal of the LD or the CD-OK reproduction signal according to the user's selection.

For example, when the digital audio signal of the LD is selected, the movable terminals of the switching switches 11 and 12 of the first switching means 50 are connected to one fixed terminal a11 and a12, and the second switching means. The movable terminals of the changeover switches 71, 72, and 73 of 70 are connected to the other fixed terminals b71, b72, and b73, and the LD digital audio signals output from the digital / analog converter 6 are the first. Through the switching switches 11 and 12 of the switching means 50 and the switching switches 71 and 72 of the second switching means 70, respectively, the L channel audio signal and the R channel audio signal are outputted as well. The video signal of the LD output from the video signal processing means 40 is output through the switch 73 of the second switching means 70.

When the analog audio signal of the LD is selected, the movable terminals of the switching switches 11 and 12 of the first switching means 50 are connected to the other fixed terminals b11 and b12, and the second switching means 70 is connected. The movable terminals of the switching switches 71, 72, and 73 are connected to the other fixed terminals b71, b72, and b73, and the analog audio signals of the LD output from the FM audio signal processing means 30 are converted into the first switching means ( Through the switching switches 11 and 12 of the 50 and the switching switches 71 and 72 of the second switching means 70, respectively, the L channel audio signal and the R channel audio signal are outputted, respectively, and the FM video signal processing is performed. The video signal of the LD output from the means 40 is output through the switch 73 of the second switching means 70.

In addition, when the audio signal and the video signal of the CD-OK are selected, the movable terminals of the switching switches 71, 72 and 73 of the second switching means 70 are connected to the fixed terminals a71, a72 and a73, respectively. The audio signal output from the CD-OK data processing means 60 is output as an L-channel audio signal and an R-channel audio signal through the switching switches 71 and 72 of the second switching means 70, and the CD-OK data. The video signal of the LD output from the processing means 60 is output through the switch 73 of the second switching means 70.

As described above, the present invention selectively reproduces the LD and the CD-OK audio signal and the video signal by reproducing the LD in which the CD-OK data is recorded with one optical disk reproducing apparatus. The economic burden can be reduced by providing only the regeneration device.

Claims (2)

A pickup unit for reproducing LD and CD-OK data recorded on an optical disk, EFM modulated signal processing means for processing digital audio signals and CD-OK data of LDs that are EFM-modulated from an output signal of the pickup unit, and the pickup unit FM audio signal processing means and FM video signal processing means for respectively processing FM signals and video signals modulated from the output signal, and analog conversion for converting the digital audio signal of LD output from the EFM modulated signal processing means into an analog signal. Means, a first switching means for selectively outputting the output signals of the analog conversion means and the FM audio signal processing means, and processing the CD-OK data output from the EFM modulated signal processing means to separate the audio signal and the video signal. CD-OK data processing means for outputting, voice signal output by the CD-OK data processing means, and voice output by the first switching means And a second switching means for selectively outputting a signal by a switching switch, and a switching switch for selectively outputting a video signal output by the CD-OK data processing means and a video signal output by the FM video signal processing means. An optical disc player. The CD-OK data processing means according to claim 1, further comprising: a CDROM decoder for decoding CD-OK data output from the EFM modulated signal processing means, and an output signal of the CDROM decoder to separate and output an audio signal and a video signal. A digital-to-analog converter for converting the audio signal separated from the CD-OK audio part, the CD-OK audio part into an analog signal, and outputting the analog signal to the second switching means, and the CD-OK audio part; And a video encoder for outputting the video signal to the second switching means for encoding and outputting the video signal.