Apparatus and method for processing audio signals recorded on a medium

Abstract

This invention relates to a karaoke CD format and a device for controlling audio signals utilizing the karaoke CD format which provides a user with selective reproduction of the voice of a player. The karaoke CD format includes a CD format divided into video sectors and audio sectors. The audio sectors are further divided into a part for recording accompaniment sound and playing sound at the same time and a part for recording accompaniment sound only. There is provided record coding information for distinguishing the parts.

What is claimed is: 
     
       1. A device for reproducing a digital signal recorded on a medium, the digital signal including a video signal and an audio signal, the audio signal being composed of data units, the data units corresponding to at least one of:
 1) a first type of digital audio data, and   2) a second type of digital audio data which includes at least one content different from the first type of digital audio data;   each data unit including attribute information, which has:
 a) first information indicating a coding mode of the digital audio data, and 
 b) second information, different than said first information, identifying the data unit as one of the first type of digital audio data or the second type of digital audio data; 
 the data units of audio signal being interleaved between data units of video signal, comprising:
 a demodulator for demodulating the digital signal to restore an original signal; 
 a signal processor for receiving the audio signal, demodulated by the demodulator, extracting the second information, separating the data units corresponding to a first type of audio signal from data units corresponding to a second type of audio signal based on the extracted second information, said signal processor including a system time clock, a memory for storing the data units corresponding to the first type and the second type of audio signal, and first or second audio presentation parts receiving the system time clock to control a presentation timing of the first type or the second type of audio signal; and 
 a controller, coupled to the signal processor, controlling the signal processor to output the data units corresponding to the first type or the second type of the audio signal designated by a user input, wherein the first or second type of audio signal, designated by the user input, is identified using the second information. 
 
   
     
     
       2. A device as claimed in  claim 1 , wherein the first type of audio signal corresponds to accompaniment sound. 
     
     
       3. A device as claimed in  claim 1 , wherein the audio signal is encoded by an MPEG coding mode, wherein the signal processor further comprises:
 an MPEG audio decoder for decoding the audio signal.   
     
     
       4. A method for reproducing a digital signal recorded on a medium, said digital signal including a video signal and an audio signal, the audio signal being composed of data units, the data units corresponding to at least one of:
 1) a first type of digital audio data, and   2) a second type of digital audio data which includes at least one content different from the first type of digital audio data;
 each data unit including attribute information, which has: 
 a) first information indicating a coding mode of the digital audio data, and 
 b) second information, different than said first information, identifying the data unit as one of the first type of digital audio data or the second type of digital audio data; 
  the data units of audio signal being interleaved between data units of video signal, the method comprising the steps of:
 demodulating the digital signal to restore an original signal; 
 receiving the demodulated audio signal; 
 extracting the second information; 
 separating the data units corresponding to a first type of audio signal from data units corresponding to a second type of audio signal based on the extracted second information, by storing the first and second types of audio signals in a memory, receiving the data units corresponding to the first and second types of audio signals in first and second audio presentation parts along with a system time clock to control a presentation timing of the first or second type of audio signal; and 
 outputting one of the first or second types of audio signals in response to a user input designating one of the first or second types of audio signals, wherein the first or second type of audio signal, designated by the user input, is identified using the second information. 
 
   
     
     
       5. The method of  claim 4 , wherein the step of separating includes separating the first type of the audio signal representing accompaniment sound. 
     
     
       6. A device for processing a digital signal, comprising:
 an audio signal processor receiving data units of digital audio data, the data units corresponding to at least one of:
 1) a first type of digital audio data, and 
 2) a second type of digital audio data which includes at least one content different from the first type of digital audio data; 
  each data unit including attribute information, which has:
 a) coding information indicating a coding mode of the digital audio data, and 
 b) identification information, different than said coding information, identifying the data unit as one of the first type of digital audio data or the second type of digital audio data; 
 
   the audio signal processor extracting the identification information, and separating the data units of the first type from the data units of the second type using the identification information, said signal processor including a system time clock, a memory for storing the data units of the first type and the second type, and first and second audio presentation parts receiving the system time clock to control a presentation timing of the data units of the first type or the second type; and
 a control circuit controlling the audio signal processor to output an audio signal corresponding to the data units of one of the first or second types, based on the identification information. 
   
     
     
       7. The device of  claim 6 , wherein the audio data of the first type includes accompaniment sound. 
     
     
       8. The device of  claim 6 , wherein the data units of digital audio data are interleaved with digital video data, and wherein the audio data of the first type includes accompaniment sound and vocals, which are associated with the digital video data. 
     
     
       9. The device of  claim 6 , wherein the audio signal processor compares the system time clock to timing information in the digital audio data, and outputs audio data with a timing based on the comparison. 
     
     
       10. The device of  claim 6 , wherein the audio signal processor MPEG decodes the audio data. 
     
     
       11. The device of  claim 6 , further comprising:
 a demodulator demodulating the digital audio data prior to receipt by the audio signal processor.   
     
     
       12. A method for processing a digital signal, comprising:
 receiving data units of digital audio data, the data units corresponding to at least one of:
 1) a first type of digital audio data, and 
 2) a second type of digital audio data which includes at least one content different from the first type of digital audio data; 
  each data unit including attribute information, which has:
 a) coding information indicating a coding mode of the digital audio data, and 
 b) identification information, different than said coding information, identifying the data unit as one of the first type of digital audio data or the second type of digital audio data; 
 extracting the identification information; 
 separating the data units of the first type from the data units of the second type using the identification information by storing the data units of the first and second types in a memory, receiving the data units of the first and second types in first or second audio presentation parts along with a system time clock to control a presentation timing of data units of the first or second type; and 
 outputting audio data corresponding to the data units of the first or second type in response to the identification information. 
 
   
     
     
       13. The method of  claim 12 , wherein the audio data of the first type includes accompaniment sound. 
     
     
       14. The method of  claim 12 , wherein the data units of digital audio data are interleaved with digital video data, and wherein the audio data of the first type includes accompaniment sound and vocals, which are associated with the digital video data. 
     
     
       15. The method of  claim 12 , further comprising:
 comparing the system time clock to timing information in the digital audio data; and   outputting the audio data with a timing based on the comparison.   
     
     
       16. The device of  claim 12 , wherein the separating step includes MPEG decoding the audio data. 
     
     
       17. The device of  claim 1 , wherein the signal processor includes a switch that selectively outputs the data units of the first type or the second type. 
     
     
       18. A method for processing a data, the method comprising:
 receiving data units of audio data, the data units corresponding to at least one of:
 1) a first audio data, and 
 2) a second audio data that is different from the first audio data; 
   the data units of audio data being specified by attribute information, which has first information of the audio data and second information, wherein the second information is different than the first information;   identifying a corresponding data unit as one of the first audio data and the second audio data based on the second information;   generating a system time clock based on system time information;   processing at least one of the first audio data and second audio data; and   controlling a presentation timing of the data units of the first audio data or the second audio data using the system time clock.   
     
     
       19. The method of claim 18, further comprising:
 demodulating the audio data modulated by a predetermined modulation method, after receiving the audio data in the receiving step.   
     
     
       20. The method of claim 18, further comprising:
 separating a header from each data unit of the audio data, the header in at least one data unit of the audio data including the system time information, while presentation time information is included in the header of the data units of the audio data.   
     
     
       21. The method of claim 18, wherein the controlling step further includes receiving a command for designating at least one of the first audio data and second audio data, and controlling the output of the designated audio data, and
 wherein the first audio data or the second audio data, designated by the command, is identified using the second information.   
     
     
       22. The method of claim 18, further comprising:
 separating the data units of the first audio data from the data units of the second audio data after identifying the data units.   
     
     
       23. An apparatus for processing data, the apparatus comprising:
 a receiving unit configured to receive data units of audio data, the data units corresponding to at least one of:
 1) a first audio data, and 
 2) a second audio data that is different from the first audio data; 
   the data units of audio data being specified by attribute information, which has first information of the audio data and second information, wherein the second information is different than the first information;   a generating unit configured to generate a system time clock based on system time information;   a processing unit configured to process at least one of the first audio data and second audio data; and   a controller configured to identify a corresponding data unit as one of the first audio data or the second audio data and control a presentation timing of the data units of the first audio data or the second audio data using the system time clock.   
     
     
       24. The apparatus of claim 23, further comprising:
 a demodulator configured to demodulate the audio data modulated by a predetermined modulation method, after receiving the audio data.   
     
     
       25. The apparatus of claim 23, further comprising:
 a separating unit configured to separate a header from each data unit of the audio data, the header in at least one data unit of the audio data including the system time information, while presentation time information is included in the header of the data units of the audio data.   
     
     
       26. The apparatus of claim 23, wherein the controller is further configured to receive a command for designating at least one of the first audio data and second audio data, and to control the output of the designated audio data, and
 wherein the first audio data or the second audio data, designated by the command, is identified using the second information.   
     
     
       27. The apparatus of claim 23, further comprising:
 a de-multiplexer configured to separate the data units of the first audio data from the data units of the second audio data.