SIGNAL PROCESSING DEVICE, METHOD, AND PROGRAM
First Claim
1. A signal processing device comprising:
- an extracting unit configured to extract an envelope information representing low frequency components of an audio signal and an envelope of high frequency components of the audio signal and a sine wave information used for identifying the frequency and emergence position of sine wave components included in the high frequency components;
a pseudo high frequency generating unit configured to generate a pseudo high frequency signal configuring the high frequency components on the basis of the low frequency signal as the low frequency component and the envelope information;
a sine wave generating unit configured to generate a sine wave signal at a frequency represented by the sine wave information and which designates the emergence position identified from the sine wave information as the start position; and
a combining unit configured to combine the low frequency signal, the pseudo high frequency signal, and the sine wave signal to generate the audio signal.
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Abstract
The present technology relates to a signal processing device, method, and program that may obtain audio at a higher audio quality when decoding an audio signal.
An envelope information generating unit 24 generates envelope information representing an envelope form of high frequency components of an audio signal to be encoded. A sine wave information generating unit 26 extracts a sine wave signal from the high frequency components of the audio signal, and generates a sine wave information representing an emergence start position of the sine wave signal. An encoding stream generating unit 27 multiplexes the envelope information, the sine wave information, and low frequency components of the audio signal that have been encoded, and outputs an encoding stream obtained as the result. As a result, the high frequency components included in the sine wave signal may be predicted at a higher accuracy from the envelope information and the sine wave information at the receiving side of the encoding stream. The present invention may be applied to a signal processing device.
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Citations
16 Claims
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1. A signal processing device comprising:
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an extracting unit configured to extract an envelope information representing low frequency components of an audio signal and an envelope of high frequency components of the audio signal and a sine wave information used for identifying the frequency and emergence position of sine wave components included in the high frequency components; a pseudo high frequency generating unit configured to generate a pseudo high frequency signal configuring the high frequency components on the basis of the low frequency signal as the low frequency component and the envelope information; a sine wave generating unit configured to generate a sine wave signal at a frequency represented by the sine wave information and which designates the emergence position identified from the sine wave information as the start position; and a combining unit configured to combine the low frequency signal, the pseudo high frequency signal, and the sine wave signal to generate the audio signal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A signal processing method to control a signal processing device, the signal processing device including
an extracting unit configured to extract an envelope information representing low frequency components of an audio signal and an envelope of high frequency components of the audio signal and a sine wave information used for identifying the frequency and emergence position of sine wave components included in the high frequency components, a pseudo high frequency generating unit configured to generate a pseudo high frequency signal configuring the high frequency components on the basis of the low frequency signal as the low frequency component and the envelope information, a sine wave generating unit configured to generate a sine wave signal at a frequency represented by the sine wave information and which designates the emergence position identified from the sine wave information as the start position, and a combining unit configured to combine the low frequency signal, the pseudo high frequency signal, and the sine wave signal to generate the audio signal, the method comprising the steps of: -
the extracting unit extracting the low frequency components, the envelope information, and the sine wave information; the pseudo high frequency generating unit generating the pseudo high frequency signal; the sine wave generating unit generating the sine wave information; and the combining unit combining the low frequency signal, the pseudo high frequency signal, and the sine wave signal to generate the audio signal.
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8. A program executing processing on a computer, the processing including the steps of
envelope information representing low frequency components of an audio signal and an envelope of high frequency components of the audio signal and sine wave information used for identifying the frequency and emergence position of sine wave components included in the high frequency components are extracted, a pseudo high frequency signal configuring the high frequency components is generated on the basis of the low frequency signal as the low frequency component and the envelope information, a sine wave signal at a frequency represented by the sine wave information and which designates the emergence position identified from the sine wave information as the start position is generated, and the low frequency signal, the pseudo high frequency signal, and the sine wave information are combined to generate the audio signal.
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9. A signal processing device comprising:
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an envelope information generating unit configured to generate envelope information representing an envelope of a high frequency signal, which is the high frequency component of an audio signal; a sine wave information generating unit configured to detect a sine wave signal included in the high frequency signal, and generating a sine wave information used for identifying the frequency and emergence position of the sine wave signal; and an output unit configured to generate and outputting data made up from a low frequency signal, which is a low frequency component of the audio signal, the envelope information, and the sine wave information. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A signal processing method to control a signal processing device, the signal processing device including
an envelope information generating unit configured to generate envelope information representing an envelope of a high frequency signal, which is the high frequency component of an audio signal; -
a sine wave information generating unit configured to detect sine wave information included in the high frequency signal, and generating a sine wave information used for identifying the frequency and emergence position of the sine wave signal; and an output unit configured to generate and output data made up from the low frequency signal, which is the low frequency component of the audio signal, the envelope information, and the sine wave information, the method comprising the steps of; the envelope information generating unit generating the envelope information; the sine wave information generating unit generating the sine wave information; and the output unit generating and outputting data made up from the low frequency signal, the envelope information, and the sine wave information.
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16. A program executing processing on a computer, the processing including the steps of
generating envelope information representing an envelope of a high frequency signal, which is a high frequency component of an audio signal, detecting a sine wave signal included in the high frequency signal, and generating a sine wave information used for identifying the frequency and emergence position of the sine wave signal, and generating and outputting data made up from a low frequency signal, which is a low frequency component of the audio signal, the envelope information, and the sine wave information.
Specification