| 摘要 |
<p>At S1, an initial value of a common scale factor is calculated. Thereafter, at S11, the initial value is corrected. A value of which the difference between the initial value and the final value of the preceding frame is added to the initial value of the current frame is a corrected initial value of the common scale factor. Scaling is performed with the corrected initial value. At S3, if it has been determined that quantizing noise of each sub band do not exceed a permissible noise, the flow advances to S5. At S5, variable length encoding is performed. At S6, it is determined whether or not the encoded code amount exceeds a target code amount. If it has been determined that the code amount exceed the target code amount, the flow advances to S7. At S7, the common scale factor is changed such that the quantizing step size becomes large and the quantizing process is restored. Thereafter, the process is repeated until it has been determined that the code amount do not exceed the target code amount. The corrected initial value allows the process time to become short.</p> |
