| 摘要 |
<p>A method (600) and apparatus (100) provides for encoding an audio signal. A bit rate value (141) is received (605). A set of energy thresholds (371), of a plurality of set of thresholds, based on the bit rate value is selected (810). The energy thresholds of each set of energy thresholds correspond on a one-to-one basis with a set of sub-bands of a received audio signal (615). The energy of each sub-band of the set of sub-bands is determined (620). A highest frequency sub-band that has an energy exceeding the corresponding threshold is determined (625). A selected bandwidth of the audio signal is encoded (630). The selected bandwidth includes only those frequencies of the audio signal that are in the highest frequency sub-band that has an energy exceeding the corresponding threshold, and the lower frequencies of the audio signal that are above a high-pass cut-off frequency.</p> |
