US 9,812,141 B2
Encoding method, decoding method, encoder apparatus, decoder apparatus, and recording medium for processing pitch periods corresponding to time series signals
Takehiro Moriya, Kanagawa (JP); Noboru Harada, Kanagawa (JP); and Yutaka Kamamoto, Kanagawa (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 13/518,525
Filed by Takehiro Moriya, Kanagawa (JP); Noboru Harada, Kanagawa (JP); and Yutaka Kamamoto, Kanagawa (JP)
PCT Filed Jan. 7, 2011, PCT No. PCT/JP2011/050186
§ 371(c)(1), (2), (4) Date Jun. 22, 2012,
PCT Pub. No. WO2011/083849, PCT Pub. Date Jul. 14, 2011.
Claims priority of application No. 2010-002494 (JP), filed on Jan. 8, 2010.
Prior Publication US 2012/0265525 A1, Oct. 18, 2012
Int. Cl. G10L 19/14 (2006.01); G10L 19/09 (2013.01)
CPC G10L 19/09 (2013.01) 24 Claims
OG exemplary drawing
 
1. An encoding method comprising:
(A) a step of obtaining pitch periods corresponding to time series signals included in a predetermined time interval; and
(B) a step of outputting a code corresponding to the pitch periods;
wherein the step (B) comprises a step of outputting the code obtained by encoding the pitch periods expressed at a first quantization resolution when an index that indicates a level of stationarity of the time series signals does not satisfy the condition that indicates high stationarity, and
of outputting the code obtained by encoding the pitch periods expressed at a second quantization resolution when the index satisfies the condition that indicates high stationarity; and
the second quantization resolution is higher than the first quantization resolution.