Patent ID: 6353703
Filing Date: 2002-03-05
Classification: H04B,H04N

Abstract:
An audio coding method for coding audio data by a subsampling coding method, comprisinga storing step of storing a set frequency fs and a conversion constant n as values used for coding processing in a register; an audio input step of inputting audio data as a coding object; an input audio sampling step of sampling the audio data using a sampling frequency determined on the basis of the stored set frequency fs to form sampled audio data; an audio data conversion step of selecting mâ€²(aâ€²a subsampling step of subsampling the converted audio data to obtain M pieces of subband signals; a coding bit allocation step of allocating coding bits to the subband signals which are less than a limit frequency fs/2n obtained from the stored set frequency fs and the conversion constant n; a quantizing step of quantizing M pieces of subband signals according to the allocated coding bits; a coding step of coding the M pieces of subband signals which are quantized to output coded data; and a coded data recording step of recording the coded data which is output; wherein the number m of the sampled audio data is the number of samples per unit time which are obtained when sampling said audio data with the set frequency fs as a sampling frequency, and the number mâ€² of the selected sampled audio data is an integer which is obtained on the basis of the conversion constant n.