Device and method for processing audio information
First Claim
1. An audio information processing device comprising:
- a subband dividing section dividing inputted audio information including a sound signal into a plurality of frequency bands;
a scaling section calculating a scaling factor, which indicates a multiplying power to a reference value, of each subband divided by the subband dividing section into each of the frequency bands, and aligning each dynamic range; and
a coding processing section compressing and coding an output signal from the scaling section by using a MPEG system to output as coded bit stream data;
further including a feature detection processing section extracting features of the audio information on the basis of the scaling factors outputted from the scaling section.
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Accused Products
Abstract
There is provided a device wherein a scaling section calculates a scaling factor, which indicates a multiplying power to a reference value, of each of the subbands that are audio information divided into a plurality of frequency bands to align each dynamic range, and an outputted signal from the scaling section is coded by a MPEG system, comprising a signal level calculating section and a feature detection processing section. The signal level calculating section calculates a signal level using a scaling factor of each of the subbands from the scaling section. The feature detection processing section, after finding a maximum value and a minimum value of the calculated signal levels, calculates a difference therebetween, determines an interval to be a voice signal when the difference value is greater than or equal to a predetermined threshold value, and determines an interval to be a signal other than voice when the difference value is less than the threshold value. Thereby, it becomes possible to extract features of input audio information during executing coding processes of the input audio information.
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Citations
24 Claims
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1. An audio information processing device comprising:
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a subband dividing section dividing inputted audio information including a sound signal into a plurality of frequency bands;
a scaling section calculating a scaling factor, which indicates a multiplying power to a reference value, of each subband divided by the subband dividing section into each of the frequency bands, and aligning each dynamic range; and
a coding processing section compressing and coding an output signal from the scaling section by using a MPEG system to output as coded bit stream data;
further includinga feature detection processing section extracting features of the audio information on the basis of the scaling factors outputted from the scaling section. - View Dependent Claims (3)
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2. The audio information processing device as claimed in claimed 1, wherein the feature detection processing section includes a means of determining whether or not the audio information is of a voice signal interval on the basis of the scaling factors.
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4. An audio information processing device comprising:
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a subband dividing section dividing inputted audio information including a sound signal into a plurality of frequency bands;
a scaling section calculating a scaling factor, which indicates a multiplying power to a reference value, of each subband divided by the subband dividing section into each of the frequency bands, and aligning each dynamic range; and
a coding processing section compressing and coding an output signal from the scaling section by using a MPEG system to output as coded bit stream data;
further including;
a feature detection processing section extracting features of the audio information on the basis of the scaling factors outputted from the scaling section; and
a signal level calculating section inputting thereto the scaling factor of each subband outputted from the scaling section, and calculating a signal level corresponding to the scaling factor;
wherein the feature detection processing section extracts features of the audio information on the basis of the signal levels calculated by the signal level calculating section. - View Dependent Claims (5, 6)
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7. An audio information processing device comprising:
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a stream dividing section, after inputting thereto bit stream data coded by a MPEG system, dividing the coded bit stream data composed of each subband divided into each frequency band into bit assigning information, a scaling factor value indicating a multiplying power to a reference value, and coded data in units of each subband; and
a decoding processing section executing a decoding process to the coded data divided by the stream dividing section in units of each subband to output as audio information;
further includinga feature detection processing section extracting features of the audio information on the basis of the scaling factor values outputted from the stream dividing section. - View Dependent Claims (8, 9)
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10. An audio information processing device comprising:
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a stream dividing section, after inputting thereto bit stream data coded by a MPEG system, dividing the coded bit stream data composed of each subband divided into each frequency band into bit assigning information, scaling factor value indicating a multiplying power to a reference value, and coded data in units of each subband; and
a decoding processing section executing a decoding process to the coded data divided by the stream dividing section in units of each subband to output as audio information;
further including;
a feature detection processing section extracting features of the audio information on the basis of the scaling factor values outputted from the stream dividing section; and
a signal level calculating section inputting thereto the scaling factor of each subband outputted from the stream dividing section to calculate a signal level;
whereinthe feature detection processing section extracts features of the audio information on the basis of the signal levels calculated by the signal level calculating section. - View Dependent Claims (11, 12, 14, 15, 17, 18, 20, 21)
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13. An audio information processing method, in an audio information processing device comprising:
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a subband dividing section dividing inputted audio information including a sound signal into a plurality of frequency bands;
a scaling section calculating a scaling factor, which indicates a multiplying power to a reference value, of each subband divided by the subband dividing section into each of the frequency bands, and aligning each dynamic range; and
a coding processing section compressing and coding an output signal from the scaling section by using a MPEG system to output as coded bit stream data;
includinga first step of extracting features of the audio information on the basis of the scaling factors outputted from the scaling section.
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16. An audio information processing method, in an audio information processing device comprising:
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a subband dividing section dividing inputted audio information including a sound signal into a plurality of frequency bands;
a scaling section calculating a scaling factor, which indicates a multiplying power to a reference value, of each subband divided by the subband dividing section into each of the frequency bands, and aligning each dynamic range; and
a coding processing section compressing and coding an output signal from the scaling section by using a MPEG system to output as coded bit stream data;
including;
a first step of extracting features of the audio information on the basis of the scaling factors outputted from the scaling section; and
a fourth step of inputting the scaling factor of each subband outputted from the scaling section, and calculating a signal level corresponding to the scaling factor;
whereinthe first step further includes a fifth step of extracting features of the audio information on the basis of the signal levels calculated in the fourth step.
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19. An audio information processing method, in an audio information processing device comprising:
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a stream dividing section, after inputting thereto bit stream data coded by a MPEG system, dividing the coded bit stream data composed of each subband divided into each frequency band into bit assigning information, a scaling factor value indicating a multiplying power to a reference value, and coded data in units of each subband; and
a decoding processing section executing a decoding process to the coded data divided by the stream dividing section in units of each subband to output as audio information;
includingan eleventh step of extracting features of the audio information on the basis of the scaling factor values outputted from the stream dividing section.
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22. An audio information processing method, in an audio information processing device comprising:
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a stream dividing section, after inputting thereto bit stream data coded by a MPEG system, dividing the coded bit stream data composed of each subband divided into each frequency band into bit assigning information, a scaling factor value indicating a multiplying power to a reference value, and coded data in units of each subband; and
a decoding processing section executing a decoding process to the coded data divided by the stream dividing section in units of each subband to output as audio information;
including;
an eleventh step of extracting features of the audio information on the basis of the scaling factor values outputted from the stream dividing section; and
a fourteenth step of inputting the scaling factor of each subband outputted from the stream dividing section to calculate a signal level;
whereinthe eleventh step further includes a fifteenth step of extracting features of the audio information on the basis of the signal levels calculated by the fourteenth step. - View Dependent Claims (23, 24)
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Specification