US 7,912,710 B2 Mar. 22, 2011
APPARATUS AND METHOD FOR CHANGING
REPRODUCTION SPEED OF SPEECH SOUND
Inventors: Hitoshi Sasaki, Kawasaki (JP); Hiroshi
Katayama, Kawasaki (JP); Rika
Nishiike, Kawasaki (JP)
Assignee: Fujitsu Limited, Kawasaki (JP)
Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 215 days.
Filed: Jul. 17, 2007
Prior Publication Data
US 2007/0265839 Al Nov. 15, 2007
Related U.S. Application Data
Continuation of application No. PCT/JP2005/000549, filed on Jan. 18, 2005.
G10L 21/04 (2006.01)
U.S. CI 704/210; 704/215; 704/504
Field of Classification Search 704/210,
704/215, 253, 500, 501, 503, 504; 370/521 See application file for complete search history.
(56) References Cited
U.S. PATENT DOCUMENTS
A method for changing reproduction speed of speech sound, includes the steps of: storing an input sound signal in a buffer; leaving a sound signal from the buffer as it is or extending the sound signal from the buffer in a sound section where a power of the input sound signal exceeds a threshold value; leaving the sound signal from the buffer as it is, compressing the sound signal from the buffer, or extending the sound signal from the buffer, in a no-sound section, so that the reproduction speed of speech sound is changed; wherein a speech head protection section is set prior to the sound section being set to be a storing amount of the buffer limited by a designated limited value; and compression or deletion of the sound signal is adjusted by a compression ratio or prevented if there is the sound section in the speech head protection section, so that speech head protection is performed.
7 Claims, 10 Drawing Sheets