Music-signal compressing/decompressing apparatus

A music-signal compressing apparatus comprising:

• a music-signal input section which inputs a music signal;
• a preprocessing section which performs preprocessing of said music-signal for an output signal of said music-signal input section at a stage preceding compression processing;
• and
• a data-compressing section which performs compression processing for an output signal of said preprocessing section;
• wherein said preprocessing section comprises:
• an audio-source separating section which performs separation processing to separate the output signal of said music-signal input section into signals in units of the type of audio source;
• a physical-property converting section which performs physical-property converting processing to change a physical property of at least one of the signals separated by said audio-source separating section;
• a signal-synthesizing section which synthesizes a plurality of signals outputted from said physical-property converting section;
• a control-information input section which inputs control information regarding the contents of the audio-source separation processing performed by said audio-source separating section and the contents of the physical-property converting processing performed by said physical-property converting section;
• and
• a preprocess control section which controls said audio-source separating section and said physical-property converting section in accordance with control information outputted from said control-information input section.

A music-signal compressing/decompressing apparatus comprising:

• a music-signal input section which inputs each of a plurality of music signals separated in units of an audio source;
• a preprocessing section which performs preprocessing of said music signal at a stage preceding compression processing for an output signal of said music-signal input section;
• a data-compressing section which performs compression processing for an output signal of said preprocessing section;
• a data-storage section which stores data compressed by said data-compressing section;
• a data-decompressing section which performs decompression processing for compressed data read out of said data-storage section;
• and
• a music-signal output section which outputs an output data of said data-decompressing section as a music signal,
• wherein said preprocessing section comprises:
• an audio-source analyzing section which analyzes a physical property of each of the signals outputted from said music-signal input section;
• a physical-property converting section which inputs an output signal of said audio-source analyzing section and performs physical-property converting processing to change the physical property of each of the signals outputted from said music-signal input section;
• a signal-synthesizing section which synthesizes a plurality of signals outputted from said physical-property converting section;
• a control-information input section which inputs information regarding the contents of the plurality of audio-source signals outputted from said music-signal input section and the contents of the physical-property converting processing performed by said physical-property converting section;
• and
• a preprocessing control section which performs control of said physical-property converting section in accordance with analysis-result data outputted from said audio-source analyzing section and control information outputted from said control-information input section.

A music-signal compressing apparatus comprising:

• a music-signal input section which inputs each of a plurality of music signals separated in units of an audio source;
• a preprocessing section which performs preprocessing of said music signal at a stage preceding compression processing for an output signal of said music-signal input section;
• and
• a data-compressing section which performs compression processing for an output signal of said preprocessing section;
• wherein said preprocessing section comprises:
• an audio-source analyzing section which analyzes a physical property of each of the signals outputted from said music-signal input section;
• a physical-property converting section which inputs an output signal of said audio-source analyzing section and performs physical-property converting processing to change the physical property of each of the signals outputted from said music-signal input section;
• a signal-synthesizing section which synthesizes a plurality of signals outputted from said physical-property converting section;
• a control-information input section which inputs information regarding the contents of the plurality of audio-source signals outputted from said music-signal input section and the contents of the physical-property converting processing performed by said physical-property converting section;
• and
• a preprocessing control section which performs control of said physical-property converting section in accordance with analysis-result data outputted from said audio-source analyzing section and control information outputted from said control-information input section.

A music-signal compressing/decompressing apparatus comprising:

• a music-signal input section which inputs a music signal;
• a music-signal output section which outputs a music signal subjected to data-compression/decompression processing;
• a preprocessing/postprocessing section which performs either of first processing or second processing when setting preprocessing in a compression mode which performs compression processing for an output signal of said music-signal input section as said first processing, and setting postprocessing in a decompression mode which performs decompression processing for outputting to said music-signal output section as said second processing;
• a data-compressing section which performs compression processing for an output signal of said preprocessing/postprocessing section in said compression mode and which outputs preprocessed information;
• a data-storage section which stores data and said preprocessed information compressed by said data-compressing section;
• and
• a data-decompressing section which performs decompression processing for the compressed data outputted from said data-storage section in said decompression mode,
• wherein said preprocessing/postprocessing section comprises:
• a first switch which shifts to said first processing or said second processing;
• a second switch which operates in relation to said first switch and gives an output of said preprocessing/postprocessing section to said data-compressing section or said music-signal output section;
• an audio-source separating section which performs separation processing for an output signal of said first switch in units of the type of audio source;
• an audio-source analyzing section which performs analysis of a physical property of each of the signals separated by said audio-source separating section;
• a physical-property converting section which inputs an output signal of said audio-source analyzing section and which performs physical-property converting processing to change the physical property of each of the signals separated by said audio-source separating section;
• a signal-synthesizing section which synthesizes a plurality of signals outputted from said physical-property converting section and which outputs to said second switch;
• a control-information input section which inputs control information regarding the contents of the audio-source separation processing performed by said audio-source separating section and the contents of the physical-property converting processing performed by said physical-property converting section when said first processing is performed;
• a preprocessing control section which performs control of said audio-source separating section and said physical-property converting section in accordance with analysis-result data outputted from said audio-source analyzing section and control information outputted from said control-information input section and which outputs the contents of the control of said audio-source separating section and said physical-property converting section to said data-compressing section as said preprocessed information;
• and
• a postprocessing control section which performs control of said audio-source separating section and said physical-property converting section in accordance with said preprocessed information when said second processing is performed.

A preprocessing control apparatus which performs preprocess control before an input music signal is compressed, comprising:

• an audio-source separating section which performs separation processing to separate an input signal into signals in units of the type of audio source;
• a physical-property converting section which performs physical-property converting processing to change a physical property of each of the signals separated by said audio-source separating section;
• a signal-synthesizing section which synthesizes a plurality of signals outputted from said physical-property converting section;
• a control-information input section which inputs control information regarding the contents of the audio-source separation processing performed by said audio-source separating section and the contents of the physical-property converting processing performed by said physical-property converting processing section;
• and
• a preprocessing control section which performs control of said audio-source separating section and said physical-property converting section in accordance with control information outputted from said control-information input section.