| 摘要 |
A hierarchy encoding apparatus capable of calculating appropriate delay amounts and also capable of suppressing increase in the bit rate. In this apparatus, a first layer encoding part ( 101 ) encodes the input signal of the n-th frame to produce a first layer encoded code. A first layer decoding part ( 102 ) generates a first layer decoded signal from the first layer encoded code and applies it to a delay amount calculating part ( 103 ) and a second layer encoding part ( 105 ). The delay amount calculating part ( 103 ) uses the first layer decoded signal and input signal to calculate the delay amount to be added to the input signal, and applies the calculated delay amount to a delay part ( 104 ). The delay part ( 104 ) delays the input signal by the delay amount applied from the delay amount calculating part ( 103 ) and then applied it to a second layer encoding part ( 105 ). The second layer encoding part ( 105 ) uses the first layer decoded signal and the input signal from the delay part ( 104 ) for encoding.
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