CDP-incorporated television receiver
FIELD OF THE INVENTION 
     The present invention relates to a compact disk player (CDP) which is incorporated into a television receiver. More particularly, the present invention relates to a device produced by incorporating a compact disk song accompaniment apparatus into a television receiver. 
     BACKGROUND OF THE INVENTION 
     A compact disk song accompaniment apparatus (CD-OK apparatus) is a device which stores thousands of songs, lyrical data, and background picture images. When a particular song is selected for reproduction, the CD-OK apparatus is capable of displaying picture images and/or lyrics which correspond to the selected song. In general, a CD-OK apparatus can store lyrics for about 2,000 songs and about 4,000 still screen images on one compact disk. 
     Also, a karaoke TV receiver is a device which also stores many songs, lyrical data, and graphic images. However, the karaoke TV receiver stores the above data in a semiconductor memory instead of a compact disk. As a result, the storage capacity of a karaoke TV receiver has about one fifth the storage capacity of a CD-OK apparatus and is capable of only storing about 400 songs and scores of graphic images. Moreover, the karaoke TV receiver functions as a karaoke parlor with compact disk graphics (CDG) level capability. 
     In a CD-OK apparatus which has no display unit, the reproduced video signal is supplied to an external video connector jack of a TV receiver via audio and video output ports. Thus, the video signal is displayed on the TV receiver and the audio signal is output to a speaker. Since external connections must be made between the TV receiver and the CD-OK apparatus, connecting the CD-OK apparatus to a TV receiver is inconvenient. 
     On the other hand, the karaoke TV receiver is incorporated with a TV set, and thus, is more convenient in some aspects than a CD-OK apparatus having no display unit. However, since the memory capacity of a karaoke TV receiver is about one fifth that of the CD-OK apparatus, only a few background graphic screens can be accommodated. 
     Also, a variety of compact disk types are currently available on the market, such as CD-digital audio disks, CD-graphics disks, and CD-video disks. Since each disk has its own particular format, each disk can only be reproduced from a CD player which is specifically produced for each of the disks above. As a result, in order to reproduce each type of disk, separate CD players are required, thus increasing the cost of developing a completely compatible reproduction system. 
     Moreover, as the number of separate CD players increases, the amount of space needed for installation and the number of unsightly external connections likewise increase. Furthermore, since each CD player is generally provided with its own exclusive remote controller, a greater number of remote controllers are required to operate the reproduction system. 
     SUMMARY OF THE INVENTION 
     In order to solve the above problems, a compact disk player (CDP) incorporated television receiver is provided. 
     In one embodiment of the present invention, the CDP-incorporated television receiver comprises: a CD reproducer for reading and processing data from a compact disk and for generating compact disk data signals; a CDG processor for extracting subcode data from the compact disk data signals and for generating a first RGB signal, a first synchronization signal, and a first chrominance subcarrier signal, which correspond to a compact disk graphics; a CDV processor for receiving the compact disk data signals and for generating a second RGB signal, a second synchronization signal, and a second chrominance subcarrier signal, which correspond to a compact disk video; a CD-OK processor for receiving the compact disk data signals and for generating a third RGB signal, a third synchronization signal, and a third chrominance subcarrier signal, which correspond to a compact disk song accompaniment; a CD controller for receiving a data signal from the CD reproducer, for discriminating a type of compact disk currently being reproduced based on the data signal, and for generating a first selection signal corresponding to the type of compact disk; a switching matrix for selectively outputting, in response to the first selection signal, either the first RGB signal, the first synchronization signal, and the first chrominance subcarrier signal, or the second RGB signal, the second synchronization signal, and the second chrominance subcarrier signal as a selected RGB signal, a selected synchronization signal, and a selected chrominance subcarrier signal; an encoder for receiving the selected RGB signal, the selected synchronization signal, and the selected chrominance subcarrier signal from the switching matrix and converting the selected RGB signal into a CD video signal; a TV receiver for receiving a TV signal of a tuned channel and for outputting a corresponding TV video signal; a TV controller for generating a second selection signal in accordance with a CD/TV selection command; a switching circuit for selectively outputting, in response to the second selection signal, either the CD video signal output from the encoder or the TV video signal output from the TV receiver as a selected video signal; and a video processor for processing the selected video signal and displaying the video signal on a monitor. 
     In another embodiment of the present invention, the CDP-incorporated television receiver comprises: a CD reproducer for reading and processing data from a compact disk and for generating compact disk data signals; a CDG processor for extracting subcode data from the compact disk data signals and for generating a first RGB signal, a first synchronization signal, and a first blanking signal, which correspond to a compact disk graphics; a CDV processor for receiving the compact disk data signals and for generating a second RGB signal, a second synchronization signal, and a second blanking signal, which correspond to a compact disk video; a CD-OK processor for receiving the compact disk data signals and for generating a third RGB signal, a third synchronization signal, and a third blanking signal, which correspond to a compact disk song accompaniment; a CD controller for receiving a data signal from the CD reproducer, for discriminating a type of compact disk currently being reproduced based on the data signal, and for generating a first selection signal corresponding to the type of compact disk; a first switching matrix for selectively outputting, in response to the first selection signal, the first RGB, synchronization, and blanking signals, the second RGB, synchronization, and blanking signals, or the third RGB, synchronization, and blanking signals as selected RGB, synchronization, and blanking signals; a TV receiver for receiving a TV signal of a tuned channel and outputting a corresponding TV video signal; a TV controller for generating a second selection signal in accordance with a CD/TV selection command; a switching circuit for selectively outputting, in response to the second selection signal, either the selected synchronization signal output from the first switching matrix or the TV video signal output from the TV receiver; a video processor for processing the TV video signal selected by the switching circuit to generate a TV RGB signal and for generating vertical and horizontal synchronization signals; and a second switching matrix for selectively outputting, in response to the selected blanking signal output from the first switching matrix, either the TV RGB signal output from the switching circuit or the selected RGB signal output from the first switching matrix as an output RGB signal. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The above objects and advantages of the present invention will become more apparent by describing in detail preferred embodiments thereof with reference to the attached drawings in which: 
     FIG. 1 is a block diagram of a CDP-incorporated television receiver according to an embodiment of the present invention; and 
     FIG. 2 is a block diagram of a CDP-incorporated television receiver according to another embodiment of the present invention. 
    
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     One embodiment of a CDP-incorporated television receiver is illustrated in FIG. 1. As shown in the figure, the CDP-incorporated television receiver includes a CD reproducer 10, a CD-graphics (CDG) processor 20, a CD-video (CDV) processor 30, and a CD-OK processor 40. 
     The CD reproducer 10 reads data from a compact disk via an optical pickup, and amplifies the data via a high frequency amplifier (not shown). Subsequently, the amplified signal is input to a digital-signal processing unit (not shown) in which the amplified signal is demodulated and/or error corrected. Afterwards the digital-signal processing unit outputs compact disk data signals which correspond to the amplified signal. 
     The CDG processor 20 inputs the compact disk data signals and extracts subcode data from the compact disk data signals. Subsequently, the CDG processor 20 generates an RGB signal, a synchronization signal (SYNC), and a chrominance subcarrier signal (FSC) for a CD-graphics based on the subcode data. Similarly, the CDV processor 30 and the CD-OK processor 40 respectively receive compact disk data signals from the CD reproducer 10 and generate RGB signals, synchronization signals, and chrominance subcarrier signals for a CD-video and a CD-OK. 
     The CDP-incorporated television receiver also contains a CD controller 50 which inputs signals from the CD reproducer 10. The CD controller 50 discriminates whether the disk currently being reproduced by the CD reproducer 10 is a CD-graphic, a CD-video, or a CD-OK. After determining the type of disk, the CD controller 50 generates a selection signal S1, S2, or S3 corresponding to the type of disk and outputs the selection signal S1, S2, or S3 to a switching matrix 60. 
     The switching matrix 60 inputs the RGB signals, synchronization signals, and chrominance subcarrier signals from the CDG processor 20, the CDV processor 30, and the CD-OK processor 40, as well as a selection signal S1, S2, or S3 from the CD controller 50. Depending on the selection signal S1, S2, or S3, the switching matrix 60 selectively outputs the RGB signal, synchronization signal, and chrominance subcarrier signal which correspond to the type of disk being reproduced in the CD reproducer 10. 
     The signals output from the switching matrix 60 are input by an encoder 70 which converts the received RGB signal into a CD video signal according to the NTSC method. The CD video signal is then output to a switching circuit 100. 
     The CDP-incorporated television receiver also comprises a TV receiver 80 which receives a TV video signal corresponding to the channel at which a tuner of the TV receiver 80 is tuned. Subsequently, the TV video signal is demodulated by a demodulator (not shown) and output to the switching circuit 100. 
     A TV controller 90 generates a selection signal and outputs such signal to the switching circuit 100 in accordance with a CD/TV selection command generated by a remote control signal. Based on the selection signal, the switching circuit 100 selectively outputs the CD video signal output from the encoder 70 or the TV video signal output from the TV receiver 80. 
     A video processor 110 inputs the selected video signal and separates the selected video signal into a luminance signal and a chrominance signal. Subsequently, the separated luminance and chrominance signals are converted into an RGB signal through a matrix circuit (not shown), and the RGB signal is supplied to a monitor 120. Then, the RGB signal is displayed on the monitor 120 in accordance with vertical and horizontal synchronization signals (V-SYNC and H-SYNC). 
     The selection signals S1, S2, and S3 are generated by the CD controller 50 as illustrated in the following table 1. 
     
                       TABLE 1                                                     
______________________________________                                    
Disk    Selection signal                                                  
type    (S1, S2, S3)                                                      
                    Outputs of switching matrix                           
______________________________________                                    
CDG     0, 0, 1     RGB, SYNC and FSC for CDG                             
CDV     0, 1, 0     RGB, SYNC and FSC for CDV                             
CD-OK   1, 0, 0     RGB, SYNC and FSC for CD-OK                           
______________________________________                                    
 
    
     According to the present embodiment, the video signal for the TV receiver 80 is converted into a luminance signal and a chrominance signal, while the video signal for the CD player is processed into an RGB signal. Therefore, the CD video signal of the CD player is processed in accordance with the video signal processing method of the TV video signal of the TV receiver 80. Also, since a switching matrix and an NTSC encoder are utilized, the burden of converting the RGB signal into a video signal by using a NTSC television method for each CD processor 20, 30 and 40 is eliminated. Thus, the circuit configuration becomes simplified and the cost is reduced. In other words, the present embodiment reduces the necessary modifications to the TV circuit and facilitates the connection of the CD player to TV circuit. 
     Another embodiment of a CDP-incorporated television receiver is illustrated in FIG. 2. The components illustrated in FIG. 2 which correspond to the same components shown in FIG. 1 are designated by the same numerals. 
     As shown FIG. 2, the CDP-incorporated television receiver includes a CD reproducer 10, a CDG processor 20, a CDV processor 30, and a CD-OK processor 40. 
     The CD reproducer 10 reads data from a compact disk via an optical pickup, and amplifies the data via a high frequency amplifier (not shown). Subsequently, the amplified signal is input to a digital-signal processing unit (not shown) in which the amplified signal is demodulated and/or error corrected. Afterwards the digital-signal processing unit outputs compact disk data signals which correspond to the amplified signal. 
     The CDG processor 20 inputs the compact disk data signals and extracts subcode data from the compact disk data signals. Subsequently, the CDG processor 20 generates an RGB signal, a synchronization signal (SYNC), and a blanking signal (BLANK) for a CD-graphics based on the subcode data. Similarly, the CDV processor 30 and the CD-OK processor 40 respectively receive compact disk data signals from the CD reproducer 10 and generate RGB signals, synchronization signals, and blanking signals for a CD-video and a CD-OK. 
     The CDP-incorporated television receiver also contains a CD controller 50 which inputs signals from the CD reproducer 10. The CD controller 50 discriminates whether the disk currently being reproduced by the CD reproducer 10 is a CD-graphic, a CD-video, or a CD-OK. After determining the type of disk, the CD controller 50 generates a selection signal S1, S2, or S3 corresponding to the type of disk and outputs the selection signal S1, S2, or S3 to a first switching matrix 130. 
     Depending on the values of the selection signals S1, S2, and S3, the first switching matrix 130 inputs the RGB signal, synchronization signal, and blanking signal from the CDG processor 20, the CDV processor 30, or the CD-OK processor 40. Subsequently, the first switching matrix 130 selectively outputs the RGB signal, synchronization signal, and blanking signal corresponding to the type of disk being reproduced in the CD reproducer 10. The RGB signal and blanking signal are output to a second switching matrix 140, and the synchronization signal is output to a switching circuit 100. 
     The CDP-incorporated television receiver also comprises a TV receiver 80 which receives a TV video signal corresponding to the channel at which the tuner is tuned. Subsequently, the TV video signal is demodulated by a demodulator (not shown) and output to the switching circuit 100. 
     A TV controller 90 generates and outputs a selection signal to the switching circuit 100 in accordance with a CD/TV selection command generated by a remote control signal. Based on the selection signal, the switching circuit 100 selectively outputs the synchronization signal output from the first switching matrix 130 or the TV video signal output from the TV receiver 80. 
     A video processor 110 inputs either the synchronization signal or the TV video signal output from the switching circuit 100. If the TV video signal is input, the video processor 110 separates the video signal into a luminance signal and a chrominance signal. Subsequently, the separated luminance and chrominance signals are converted into an RGB signal through a matrix circuit (not shown), and the RGB signal is supplied to the second switching matrix 140. Then, the video processor 110 supplies vertical and horizontal synchronization signals (V-SYNC and H-SYNC) to a monitor 120 in accordance with the RGB signals. 
     The second switching matrix 140 inputs the blanking signal from the first switching matrix 130 and selectively inputs the RGB signals from the video processor 110 or the RGB signals from the first switching matrix 130 based on the blanking signal. Subsequently, the selected RGB signal is output to the monitor 120 to be displayed. Since the second switching matrix 140 selectively inputs the RGB signal corresponding to the TV video signal or RGB signal corresponding to CD video signal in response to the blanking signal, the TV screen of the monitor 120 can be quickly and easily overlaid with the screen reproduced from the compact disk. 
     In contrast to the embodiment illustrated in FIG. 1, the present embodiment selects the RGB signal such that the NTSC encoder is not necessary. Moreover, since the RGB signal reproduced from a compact disk is not converted to luminance and chrominance signals by an NTSC method and then converted back into an RGB signal to be displayed on the monitor 120, the amount of noise which is generated in the displayed signal is significantly reduced, and the picture quality of the displayed signal is substantially enhanced. In other words, since the RGB signals output from the CDP are displayed without being extensively processed, the modification of the CDP is minimized. Therefore, in order to integrate the CDP and the TV, the RGB switching circuit for a TV receiver merely has to be added. 
     As described above, according to the present invention, video signals for a CDP-incorporated television receiver are easily switched between the CDP and the TV receiver. As a result, the configuration of the device is simplified, the cost of the device is reduced, and the picture quality of the device is improved.