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.An apparatus, method and storage medium for reproducing digital data, are discussed. According to an embodiment, the apparatus includes a demultiplexing circuit to receive data units of digital audio data and separate a system time information from at least one data unit of digital audio data, the digital audio data including at least two 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 type of digital audio data being specified by attribute information, which has: a ) first information for indicating a coding mode of the digital audio data, and b ) second information, different than the first information, for identifying one of the first type of digital audio data and the second type of digital audio data.

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. An apparatus for processing a digital data, comprising:
   a demultiplexing circuit to receive data units of digital audio data and separate a system time information from at least one data unit of digital audio data, the digital audio data including at least two 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 type of digital audio data being specified by attribute information, which has:      a )  first information for indicating a coding mode of the digital audio data, and        b )  second information, different than said first information, for identifying one of the first type of digital audio data and the second type of digital audio data;          a data storage to temporarily store the first and second types of digital audio data;        an audio data processor to process at least one of first and second types of digital audio data identified by the second information, the audio data processor including a decoder to decode the compressed digital audio data;        a system time clock circuit to receive the system time information and generate a system time clock based on the system time information; and        a control circuit, coupled to the audio data processor, to control a presentation timing of the first or second types of digital audio data in response to the system time clock from the system time clock circuit.      
     
     
       19. The apparatus of  claim 18 , wherein the demultiplexing circuit is further configured to separate the first type of digital audio data from the second type of digital audio data by using the second information.  
     
     
       20. The apparatus of  claim 18 , wherein the data units of digital audio data are multiplexed with data units of digital video data, wherein the demultiplexing circuit is further configured to separate the digital audio data from the digital video data, by using the first information.  
     
     
       21. The apparatus of  claim 18 , wherein the control circuit is configured to control the presentation timing based on a presentation time information included in the digital audio data, the presentation time information being synchronized to the system time clock from the system time clock circuit, and control the output of the first or second types of digital audio data with a timing.  
     
     
       22. The apparatus of  claim 21 , wherein the demultiplexing circuit is further configured to separate the presentation time information from at least one data unit of first or second types of digital audio data.  
     
     
       23. The apparatus of  claim 18 , wherein the control circuit is further configured to identify the coding mode of the first or second types of digital audio data, the coding mode for indicating MPEG audio data, and wherein the decoder is configured to decode the digital audio data compressed in MPEG format.  
     
     
       24. The apparatus of  claim 18 , further comprising:
   a demodulator to demodulate the digital audio data to an original data, prior to receipt by the demultiplexing circuit.      
     
     
       25. The apparatus of  claim 18 , wherein the control circuit is further configured to receive a request for designating one of first and second types of digital audio data, and
   wherein the first or second type of audio data, designated by the request, is identified using the second information.      
     
     
       26. The apparatus of  claim 18 , further comprising:
   a D/A converter coupled to the audio data processor to convert at least one of the first and second types of digital audio data to analog signal.      
     
     
       27. The apparatus of  claim 18 , wherein the at least one of the first and second types of digital audio data includes vocal data, and
   wherein the audio data processor is configured to process the vocal data.      
     
     
       28. A method for processing a digital data, comprising:
   receiving data units of digital audio data, the data units corresponding to at least two 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 type of digital audio data being specified by attribute information, which has:      a )  first information for indicating a coding mode of the digital audio data, and        b )  second information, different than said first information, for identifying one of the first type of digital audio data and the second type of digital audio data;          separating a system time information from at least one of data units of first or second types of digital audio data and separating the first type of digital audio data from the second type of digital audio data using the second information and storing the first and second types of digital audio data;        processing at least one of the first and second types of digital audio data to output the first or second types of digital audio data in response to a designation signal, the designation signal for selecting the first or second types of digital audio data; and        controlling a presentation timing of the first or second types of digital audio data in response to the system time information,        wherein the first or second types of digital audio data is identified by the second information, in response to the designation signal.      
     
     
       29. The method of  claim 28 , wherein the data units of digital audio data are multiplexed with data units of digital video data, further comprising:
   separating the digital audio data from the digital video data, by using the first information.      
     
     
       30. The method of  claim 28 , wherein the controlling step controls the presentation timing according to a presentation time information included in the digital audio data, the presentation time information being synchronized to a system time clock derived by the system time information, and outputs the first or second types of digital audio data with a timing.  
     
     
       31. The method of  claim 28 , further comprising:
   identifying the coding mode of the first or second types of digital audio data based on the first information, the coding mode for indicating MPEG audio data, and        wherein the processing step includes decoding the digital audio data encoded in MPEG format.      
     
     
       32. The method of  claim 28 , further comprising:
   demodulating the digital audio data to an original data, prior to receipt by the receiving step.      
     
     
       33. The method of  claim 28 , further comprising:
   converting the designated first or second types of digital audio data to analog signal.      
     
     
       34. The method of  claim 28 , wherein the at least one of the first and second types of digital audio data includes vocal data, and
   wherein the processing step processes the vocal data.