JP2010250073A5 - - Google Patents

Description

The present invention, in order to solve the problems described above, the sampling frequency of the audio data, and said first sampling frequency from a first sampling frequency to a sound processing apparatus for converting different second sampling frequency, and quantization bit number of audio data, a first sampling frequency, and obtaining means for obtaining a second sampling frequency, based on the number of quantization bits and the second sampling frequency, the integer of the second sampling frequency A determination means for determining a third sampling frequency having a double magnification and a sample interpolation process for the audio data, thereby converting the sampling frequency of the audio data from the first sampling frequency to the third sampling frequency. first converting means and the voice data of the sampling frequency by the first converting means is converted to By performing the thinning processing of the sample according to the magnification with respect to, and a second converting means for converting the sampling frequency of the audio data from the third sampling frequency to a second sampling frequency, determining means, a third sampling frequency, the larger the number of quantization bits rather high, an audio processing apparatus characterized by determining a lower frequency as the number of quantization bits is small.

Claims (9)

The sampling frequency of the audio data, the first sampling frequency from a first sampling frequency to a sound processing apparatus for converting a different second sampling frequency,
Obtaining means for obtaining a quantization bit number of the audio data, the first sampling frequency, and the second sampling frequency;
Based on the number of quantization bits and the second sampling frequency, and determining means for determining a third sampling frequency which has an integer multiple of the ratio of the second sampling frequency,
First conversion means for converting the sampling frequency of the audio data from the first sampling frequency to the third sampling frequency by performing sample interpolation processing on the audio data ;
By performing the thinning processing of the sample in accordance with the magnification to the audio data sampling frequency is converted by said first converting means, the sampling frequency of the audio data from said third sampling frequency the Second conversion means for converting to a sampling frequency of 2;
It said determining means, said third sampling frequency, the quantization bit number is rather high larger, the audio processing apparatus according to claim <br/> determining a lower frequency as the small number of quantization bits. The determination unit obtains the pre Kibai rate using a function of the number of quantization bits, determines the sampling frequency obtained by multiplying the said magnification to said second sampling frequency as the third sampling frequency The speech processing apparatus according to claim 1. 3. The function according to claim 2 , wherein the function is a function that determines , according to the number of quantization bits, the magnification at which an S / N ratio of the audio data after the conversion by the second conversion means is greater than or equal to a predetermined value. The voice processing apparatus according to 1. Said determining means, said obtains the magnification from a table showing a prior Kibai rate according to the number of quantization bits, the second the sampling frequency obtained by multiplying the sampling frequency of the third sampling said magnification The speech processing apparatus according to claim 1, wherein the speech processing apparatus is determined as a frequency. The table, the sound processing apparatus according to claim 4, characterized in Tei Rukoto associated said ratio according to the range of the number of quantization bits. 6. The speech processing apparatus according to claim 4, wherein the table indicates the magnification at which an S / N ratio of the speech data after the conversion by the second conversion unit is equal to or greater than a predetermined value. 6. The speech processing apparatus according to claim 4 , further comprising setting means for setting a combination of the number of quantization bits and the magnification in the table by a user operation. The sampling frequency of the audio data, the first sampling frequency from a first sampling frequency to a speech processing method for converting a different second sampling frequency,
An obtaining step for obtaining the quantization bit number of the audio data, the first sampling frequency, and the second sampling frequency;
Determining means, a determination step based on said quantization sampling frequency number and the second bit, determining a third sampling frequency which has an integer multiple of the ratio of the second sampling frequency,
A first conversion step in which first conversion means converts the sampling frequency of the audio data from the first sampling frequency to the third sampling frequency by performing sample interpolation processing on the audio data. When,
By the second conversion means, performs thinning processing of the samples in accordance with the magnification to the audio data sampling frequency is converted in the first conversion step, the sampling frequency of the audio data first A second conversion step of converting from a sampling frequency of 3 to the second sampling frequency,
Said determining means in said determining step, said third sampling frequency, the quantization bit number is rather high larger, and wherein the <br/> determining a lower frequency as the small number of quantization bits Audio processing method.   A program for causing a computer to function as each unit of the sound processing apparatus according to any one of claims 1 to 7.