msm6679al-110 Oki Semiconductor, msm6679al-110 Datasheet - Page 17

Manufacturer Part Number

msm6679al-110

Description

Si/sd Voice Recognizer, Recorder/player, And Speech

Manufacturer

Oki Semiconductor

Datasheet

1.MSM6679AL-110.pdf (46 pages)

¡ Semiconductor

FUNCTIONAL DESCRIPTION

Voice Recognition

The MSM6679AL-110 performs both SI and SD recognition. SI vocabularies are embedded in the

MSM6679AL-110. For SD recognition, each recognized phrase must be enrolled in the

MSM6679AL-110’s vocabulary by creating a composite template from multiple recordings of the

same phrase. Then the composite tempalte is stored in SRAM or FLASH memory. During both

SI and SD recognition, the MSM6679AL-110 performs the following steps:

1. After external band-pass filtering, the MSM6679AL-110 converts the analog signal to PCM

2. The MSM6679AL-110 extracts significant features from the sample data by frequency and

3. The MSM6679AL-110 compares the analyzed input with the reference data for each signal,

4. The vocabulary phrase that achieves the highest score (or lowest distance) is judged to match

5. Via a special command, the MSM6679AL-110 can also return the scores of the input against

SI Recognition

Oki supplies the MSM6679AL-110 with predefined SI vocabularies which Oki builds from

hundreds of utterances by a wide variety of speakers. SI vocabularies are limited to 25 words or

less, which allows the MSM6679AL-110 to achieve a net accuracy of >95%, even in noisy

conditions.

SI vocabularies are grouped into sub-vocabularies of 15 words, to maintain the highest

accuracy. Similar words in any one sub-vocabulary can cause substitution errors.

Oki Semiconductor’s standard cellular vocabulary is intended for an automotive environment

with a far-talk microphone. This vocabulary may work adequately in other conditions, such as

an office or outside, but recognition performance may be degraded.

MSM6679AL-110 Cellular SI Recognition Vocabulary

Sub-Vocabulary 1