Patent ID: 8542728

Claim:
An inverse quantization processing method, applied to a decoder, comprising: receiving a plurality of quantized frequency-domain data; performing a bit reduction on a current quantized frequency-domain data of the plurality of the quantized frequency-domain data according to an adjusting factor when, among the plurality of the quantized frequency-domain data, an accumulated count value of a plurality of valid bit numbers greater than a first threshold reaches a second threshold, to generate a bit-reduced quantized frequency-domain data, wherein the adjustment factor is an integer, and each valid bit number represents a bit number of a first non-zero bit of the corresponding quantized frequency-domain data; performing a frequency/time domain conversion on the bit-reduced quantized frequency-domain data to generate a bit-reduced time-domain pulse code modulation (PCM) data; and performing a bit addition on the bit-reduced time-domain PCM data according to the adjusting factor to generate a time-domain PCM data.