Japanese Short Sentence Speech Database
Japanese Short Sentence Speech Database

Contains Japanese speech samples spoken by native speakers male and female.

Benefits / Features


This product has been developed to meet the needs of our overseas clients who wish to test the capabilities of their Japanese-language speech codec algorithms or telecommunication speech terminals. Samples in this database have been used in subjective standardization tests for the ITU-T 16 kbit/s wideband codec and 4kbit/s speech codec algorithms. Merging the database files enables users to make speech samples comprising sentence pairs and time structure as given in ITU-T Recommendation P.800 and the subjective test plan of 3GPP.

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Specifications / Details



All speech samples are recorded using digital equipment, with all recording complying with ITU-T Recommendation P.800. All recording is done using a high-quality, low-noise condenser microphone for measuring sound. Puff noise is prevented through a screening process.


A total of 100 male or 100 female native Japanese speakers, ranging from 15 to 65 years in age, are employed. They are given no special instructions regarding utterances, and their native accent is preserved unless it results in readings or lexical meanings that are incorrect.


Each speaker utters 200 short Japanese sentences. The speaker set for each sentence differs slightly due to the removal, in some cases, of speakers with incorrect utterances or extraneous noise.

※We also offer Elderly and Children Speech Database(Japanese)speaking same sentences of Japanese short sentence speech database.


All speech samples are recorded on ISO 9660-formatted CD disks. Speech data are sampled at 16-bit and 16kHz rates and formed into raw (binary) data files.* Speech samples are digitized at 16-bit and 16kHz rates. All files are stored in ISO9660-formatted CD-ROMs.
The active power level of each sample is normalized to-26 dBov according to the ITU-T Rec.P.56 algorithm.

*Files can be changed to Windows WAV format using included software under the DOS window. A byte change is necessary to apply them to the UNIX system.


Japanese Short Sentence Speech Database Please contact us.


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