Wideband audio signal encoding apparatus that divides wide band audio data into a number of sub-bands of numbers of bits for quantization based on noise floor information

A wide band audio signal encoding apparatus comprising:

• encoding system controlling means for determining a bandwidth of division and a number N of division of bands of wide band audio data so that only a signal band included in signal band information is a band to be encoded, based on signal information including the signal band information of the wide band audio data;
• a sub-band dividing filter being operable to divide the wide band audio data into signal data of a natural number of N sub-bands having the bandwidth of division and the number N of division determined by said encoding system controlling means, and being operable to output the resulting data;
• N sub-sampling means for sub-sampling the signal data of the N sub-bands outputted from said sub-band dividing filter, respectively, and outputting the resulting data;
• N redundancy compressing means for determining a scale factor by detecting a signal data peak level within a time period of the signal data of at least one sub-band of the N sub-bands outputted from said N sub-sampling means, executing an eliminating process for eliminating a high-order redundant run length for the signal data of the N sub-bands based on the scale factor, and outputting the eliminating processed signal data of the N sub-bands;
• and
• a multiplexer for multiplexing the scale factor determined by said N redundancy compressing means with the eliminating processed signal data of the N sub-bands outputted from said N redundancy compressing means, and outputting the multiplexed encoded data,
• wherein the signal data of a base band, the base band being a lowest band of the N sub-bands, is not subjected to the eliminating process executed by said N redundancy compressing means and instead, is encoded by a linear coding PCM system having a number of bits for quantization in a range of 16 bits to 24 bits.

A wide band audio signal encoding apparatus comprising:

• encoding system controlling means for determining a bandwidth of division and a number N of division of bands of wide band audio data so that only a signal band included in signal band information is a band to be encoded, based on signal information including the signal band information of the wide band audio data;
• a sub-band dividing filter being operable to divide the wide band audio data into signal data of a natural number of N sub-bands having the bandwidth of division and the number N of division determined by said encoding system controlling means, and being operable to output the resulting data;
• N sub-sampling means for sub-sampling the signal data of the N sub-bands outputted from said sub-band dividing filter, respectively, and outputting the resulting data;
• N redundancy compressing means for determining a scale factor by detecting a signal data peak level within a time period of the signal data of at least one sub-band of the N sub-bands outputted from said N sub-sampling means, executing an eliminating process for eliminating a high-order redundant run length for the signal data of the N sub-bands based on the scale factor, and outputting the eliminating processed signal data of the N sub-bands;
• and
• a multiplexer for multiplexing the scale factor determined by said N redundancy compressing means with the eliminating processed signal data of the N sub-bands outputted from said N redundancy compressing means, and outputting the multiplexed encoded data,
• wherein a bandwidth of a base band, the base band being a lowest band of the N sub-bands, is set to a bandwidth of 10 kHz to 48 kHz.

A wide band audio signal encoding apparatus comprising:

• encoding system controlling means for determining a bandwidth of division and a number N of division of bands of wide band audio data so that only a signal band included in signal band information is a band to be encoded, based on signal information including the signal band information of the wide band audio data;
• a sub-band dividing filter being operable to divide the wide band audio data into signal data of a natural number N of sub-bands having the bandwidth of division and the number N of division determined by said encoding system controlling means, and being operable to output the resulting data;
• N sub-sampling means for sub-sampling the signal data of the N sub-bands outputted from said sub-band dividing filter, respectively, and outputting the resulting data;
• redundancy compressing means for compressing the signal data by executing a reversible redundancy compressing process on the signal data of at least one sub-band among the signal data of the N sub-bands outputted from said N sub-sampling means, and being operable to output the compressing processed signal data;
• and
• a multiplexer being operable to multiplex the signal data of the N sub-bands outputted from said sub-sampling means and said redundancy compressing means, and outputting the multiplexed encoded data,
• wherein a bandwidth of a base band, the base band being a lowest band of the N sub-bands, is set to a bandwidth of 10 kHz to 48 kHz.

A wide band audio signal encoding apparatus comprising:

• encoding system controlling means for determining a bandwidth of division and a number N of division of bands of wide band audio data so that only a signal band included in signal band information is a band to be encoded, based on signal information including the signal band information of the wide band audio data;
• a sub-band dividing filter being operable to divide the wide band audio data into signal data of a natural number N of sub-bands having the bandwidth of division and the number N of division determined by said encoding system controlling means, and being operable to output the resulting data;
• N sub-sampling means for sub-sampling the signal data of the N sub-bands outputted from said sub-band dividing filter, respectively, and outputting the resulting data;
• redundancy compressing means for compressing the signal data by executing a reversible redundancy compressing process on the signal data of at least one sub-band among the signal data of the N sub-bands outputted from said N sub-sampling means, and being operable to output the compressing processed signal data;
• and
• a multiplexer being operable to multiplex the signal data of the N sub-bands outputted from said sub-sampling means and said redundancy compressing means, and outputting the multiplexed encoded data,
• wherein the signal data of a base band, the base band being a lowest band of the N sub-bands, is not subjected to the compressing process executed by said redundancy compressing means and instead, is encoded by a linear coding PCM system having a number bits for quantization in a range of 16 bits to 24 bits.

A wide band audio signal encoding apparatus comprising:

• encoding system controlling means for determining a bandwidth of division and a number N of division of bands of wide band audio data based on signal information including noise floor information and signal band information of the wide band audio data, and determining a number of bits for quantization in N sub-sampling means based on the noise floor information, respectively;
• a sub-band dividing filter being operable to divide the wide band audio data into signal data of N sub-bands having the bandwidth of division and the number N of division determined by said encoding system controlling means, and being operable to output the resulting data;
• said N sub-sampling means for sub-sampling the signal data of the N sub-bands outputted from said sub-band dividing filter with the number of bits for quantization determined by said encoding system controlling means, respectively, and outputting the resulting data;
• and
• a multiplexer being operable to multiplex the signal data of the N sub-bands outputted from said N sub-sampling means with the signal information, and being operable to output the multiplexed encoded data,
• wherein said encoding system controlling means determines the number of bits for quantization of each of the N sub-bands so that a level, which is a decibel value lower than a decibel value of a noise floor included in the noise floor information, is set to a minimum level of code quantization in each of the N sub-bands, and
• a bandwidth of a base band, the base band being a lowest band of the N sub-bands, is set to a bandwidth of 10 kHz to 48 kHz.

A wide band audio signal encoding apparatus comprising:

• encoding system controlling means for determining a bandwidth of division and a number N of division of bands of wide band audio data based on signal information including noise floor information and signal band information of the wide band audio data, and determining a number of bits for quantization of N sub-sampling means based on the noise floor information, respectively;
• a sub-band dividing filter being operable to divide the wide band audio data into signal data of N sub-bands having the bandwidth of division and the number N of division determined by said encoding system controlling means, and being operable to output the resulting data;
• said N sub-sampling means for sub-sampling the signal data of the N sub-bands outputted from said sub-band dividing filter with the number of bits for quantization determined by said encoding system controlling means, respectively, and outputting the resulting data;
• N redundancy compressing means for compressing signal data by executing a reversible redundancy compressing process on the signal data of the N sub-bands outputted from said N sub-sampling means, and outputting the compressing processed signal data;
• and
• a multiplexer being operable to multiplex the signal data of the N sub-bands outputted from said N redundancy compressing means and the signal information, and being operable to output the multiplexed encoded data,
• wherein said encoding system controlling means determines the number of bits for quantization of each of the N sub-bands so that a level, which is a decibel value lower than a decibel value of a noise floor included in the noise floor information, is set as a minimum level of code quantization in each of the N sub-bands, and
• a bandwidth of a base band, the base band being a lowest band of the N sub-bands, is set to a bandwidth of 10 kHz to 48 kHz.

A wide band audio signal encoding apparatus comprising:

• encoding system controlling means for determining a bandwidth of division and a number N of division of bands of wide band audio data based on signal information including noise floor information and signal band information of the wide band audio data, and determining a number of bits for quantization of N sub-sampling means based on the noise floor information, respectively;
• a sub-band dividing filter being operable to divide the wide band audio data into signal data of N sub-bands having the bandwidth of division and the number N of division determined by said encoding system controlling means, and being operable to output the resulting data;
• said N sub-sampling means for sub-sampling the signal data of the N sub-bands outputted from said sub-band dividing filter with the number of bits for quantization determined by said encoding system controlling means, respectively, and outputting the resulting data;
• N redundancy compressing means for compressing signal data by executing a reversible redundancy compressing process on the signal data of the N sub-bands outputted from said N sub-sampling means, and outputting the compressing processed signal data;
• and
• a multiplexer being operable to multiplex the signal data of the N sub-bands outputted from said N redundancy compressing means and the signal information, and being operable to output the multiplexed encoded data,
• wherein said encoding system controlling means determines the number of bits for quantization of each of the N sub-bands so that a level, which is a decibel value lower than a decibel value of a noise floor included in the noise floor information, is set as a minimum level of code quantization in each of the N sub-bands, and
• the signal data of a base band, the base band being a lowest band of the N sub-bands, is not subjected to the compressing process executed by said redundancy compressing means and instead, is encoded by a linear coding PCM system having a number of bits for quantization in a range of 16 bits to 24 bits.

A wide band audio signal encoding apparatus comprising:

• encoding system controlling means for determining a bandwidth of division and a number N of division of bands of wide band audio data so that only a signal band included in signal band information becomes a band to be encoded, based on signal information including signal band information of the wide band audio data;
• a sub-band dividing filter being operable to divide the wide band audio data into signal data of N sub-bands having the bandwidth of division and the number N of division determined by said encoding system controlling means, and outputting the resulting data;
• N sub-sampling means for sub-sampling the signal data of the N sub-bands outputted from said sub-band dividing filter, respectively, and outputting the resulting data;
• redundancy compressing means for executing a reversible Δ-Σ modulating process on the signal data of at least one of the N sub-bands outputted from said N sub-sampling means, and outputting the modulating processed signal data;
• and
• a multiplexer being operable to multiplex the signal data of the N sub-bands outputted from said N sub-sampling means and said redundancy compressing means, and being operable to output the multiplexed encoded data,
• wherein a bandwidth of a base band, the base band being a lowest band of the N sub-bands, is set to a bandwidth of 10 kHz to 48 kHz.

A wide band audio signal encoding apparatus comprising:

• encoding system controlling means for determining a bandwidth of division and a number N of division of bands of wide band audio data so that only a signal band included in signal band information becomes a band to be encoded, based on signal information including signal band information of the wide band audio data;
• a sub-band dividing filter being operable to divide the wide band audio data into signal data of N sub-bands having the bandwidth of division and the number N of division determined by said encoding system controlling means, and outputting the resulting data;
• N sub-sampling means for sub-sampling the signal data of the N sub-bands outputted from said sub-band dividing filter, respectively, and outputting the resulting data;
• redundancy compressing means for executing a reversible Δ-Σ modulating process on the signal data of at least one of the N sub-bands outputted from said N sub-sampling means, and outputting the modulation processed signal data;
• and
• a multiplexer being operable to multiplex the signal data of the N sub-bands outputted from said N sub-sampling means and said redundancy compressing means, and being operable to output the multiplexed encoded data,
• wherein the signal data of a base band, the base band being a lowest band of the N sub-bands, is not subjected to the modulating process executed by said redundancy compressing means and instead, is encoded by a linear coding PCM system having a number of bits for quantization in a range of 16 bits to 24 bits.