ENCODING METHOD, DECODING METHOD, ENCODER, DECODER, PROGRAM, AND RECORDING MEDIUM
First Claim
1. An encoding method comprising acquiring codes corresponding to prediction residuals obtained according to prediction analysis applied to time series signals included in a predetermined time interval of input time series signals, with the number of bits to be assigned to the codes corresponding to the prediction residuals being switched according to whether an index that indicates a level of periodicity and/or stationarity corresponding to the time series signals in the predetermined time interval or time series signals in an interval before the predetermined time interval of the input time series signals satisfies a condition that indicates high periodicity and/or high stationarity or a condition that indicates low periodicity and/or low stationarity.
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Abstract
In encoding, the number of bits to be assigned to codes corresponding to noise or a pulse sequence obtained according to prediction analysis applied to time series signals included in a predetermined time interval is switched according to whether an index that indicates a level of periodicity and/or stationarity of input time series signals satisfies a condition that indicates high periodicity and/or high stationarity or a condition that indicates low periodicity and/or low stationarity, to acquire the codes corresponding to the noise and the pulse sequence. In decoding, a decoding mode for codes corresponding to noise or a pulse sequence included in codes corresponding to a predetermined time interval is switched according to the same criterion as that described above to decode the codes corresponding to the noise or the pulse sequence to acquire noise or a pulse sequence corresponding to the predetermined time interval.
25 Citations
36 Claims
- 1. An encoding method comprising acquiring codes corresponding to prediction residuals obtained according to prediction analysis applied to time series signals included in a predetermined time interval of input time series signals, with the number of bits to be assigned to the codes corresponding to the prediction residuals being switched according to whether an index that indicates a level of periodicity and/or stationarity corresponding to the time series signals in the predetermined time interval or time series signals in an interval before the predetermined time interval of the input time series signals satisfies a condition that indicates high periodicity and/or high stationarity or a condition that indicates low periodicity and/or low stationarity.
- 13. A decoding method comprising decoding codes corresponding to noise or a pulse sequence included in codes corresponding to a predetermined time interval to acquire noise or a pulse sequence corresponding to the predetermined time interval, with a decoding mode for the codes corresponding to the noise or the pulse sequence being switched according to whether an index that indicates a level of periodicity and/or stationarity corresponding to the predetermined time interval or an interval before the predetermined interval, the index being included in input codes or obtained from the codes, satisfies a condition that indicates high periodicity and/or high stationarity or a condition that indicates low periodicity and/or low stationarity.
- 25. An encoder for acquiring codes corresponding to prediction residuals obtained according to prediction analysis applied to time series signals included in a predetermined time interval of input time series signals, with the number of bits to be assigned to the codes corresponding to the prediction residuals being switched according to whether an index that indicates a level of periodicity and/or stationarity corresponding to the time series signals in the predetermined time interval or time series signals in an interval before the predetermined time interval of the input time series signals satisfies a condition that indicates high periodicity and/or high stationarity or a condition that indicates low periodicity and/or low stationarity.
- 28. A decoder for decoding codes corresponding to noise or a pulse sequence included in codes corresponding to a predetermined time interval to acquire noise or a pulse sequence corresponding to the predetermined time interval, with a decoding mode for the codes corresponding to the noise or the pulse sequence being switched according to whether an index that indicates a level of periodicity and/or stationarity corresponding to the predetermined time interval or an interval before the predetermined interval, the index being included in input codes or obtained from the codes, satisfies a condition that indicates high periodicity and/or high stationarity or a condition that indicates low periodicity and/or low stationarity.
Specification