DEVICE AND METHOD FOR DETECTING AND RETRIEVING INFORMATION

摘要

PROBLEM TO BE SOLVED: To effectively conduct the recognition processing and the retrieval processing of speakers in a coded speech data with a small amount of calculation and memory capacity. SOLUTION: In an information retrieval device 30, a LSP decoding part 22 extracts only LSP information from coded speech data that are read in each block and decoded. A LPC converting part 23 converts the LSP information into LPC information and a cepstrum converting part 24 converts the LPC information into LPC cepstrum that is characteristic amount of speech. A vector quantizing part 25 gives the LPC cepstrum vector quantization and a speaker recognizing part 26 recognizes the speaker based on a result of the vector quantization. The recognized speaker and a retrieval condition are compared in a condition comparing part 32, whereby a retrieval result is outputted.