| 摘要 |
A speech signal processing circuit including an input buffer (30) for receiving input of inverse quantization samples and temporarily storing the same, a band synthesis filter (40) for reading the inverse quantization samples stored in the input buffer (30) one by one and conducting quadrature conversion processing and sum-of-product operation processing to decode the samples into speech signals, and a control circuit (20) for controlling operation of the band synthesis filter (40), the control circuit (20), when recognizing the inverse quantization samples as being stored in the input buffer (30), controlling the band synthesis filter (40) to execute, as an initial operation, the quadrature conversion processing of the inverse quantization samples as many times as a number predetermined corresponding to an operation delay time of the band synthesis filter (40), and after the completion of the initial operation, controlling the band synthesis filter (40) to continue, as a steady operation, the quadrature conversion processing of the inverse quantization samples stored in the input buffer (30), as well as to conduct the sum-of-product operation processing with respect to the results of the quadrature conversion processing. <IMAGE> |
