RSC4128 datasheet(5/49 Pages) ETC

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Data Sheet

RSC-4128

P/N 80-0206-J

Speech Technologies

Speech Recognition

The RSC-4128 is designed to support HMM (Hidden Markov Modeling) as well as Neural Network technologies

provided in Sensory Speech™ 7 firmware, to perform speaker independent (SI) speech recognition. Speaker

independent recognition requires on-chip or off-chip ROM to store the words to be recognized.

Speaker dependent (SD) recognition requires programmable memory to store personalized speech templates.

This programmable memory may be on-chip SRAM or off-chip Serial EEPROM, Flash Memory, or SRAM.

The RSC-4128 has several additional speech recognition features as described below:

Speaker Independent recognition requires no user training. The RSC-4128 can recognize up to 20 words in an

active set (number of sets is limited only by internal ROM or external memory size). Text-to-SI (T2SI) recognition,

based on HMM technology, allows creation of SI recognition sets in seconds by simply typing in the vocabulary

desired, with no costs or delays associated with recording and training the recognizer.

Speaker Dependent recognition allows the user to create names for products or customize vocabularies. Up to

100 words can be recognized in an active set (number of sets is limited only by internal ROM or external memory

size). The RSC-4128 can store up to 10 SD words in on-chip SRAM.

Continuous Listening allows the chip to continuously listen for a specific trigger word. With this feature, a product

“activates” when a specific word is spoken, framed by quiet before and after. Continuous listening provides the

lowest false fire rate for trigger words.

Word Spotting allows the chip to continuously recognize for up to 10 SI or 5 SD words at a time. In word spotting

mode, the word(s) to be recognized may be spoken in the middle of speech.

Speaker Verification

The RSC-4128 also supports Sensory’s speaker verification (SV) technology – the most successful biometric

security on the market. After a speaker trains the chip on a specific word or words, the chip is able to identify

whether a particular word is spoken by the original speaker. The RSC-4128 can store up to 10 SV templates on-

chip, or more with external programmable memory.

Speech and Music Synthesis

The RSC-4128 provides high-quality speech synthesis using state-of-the-art frequency domain techniques in

Sensory’s new “SX” synthesis technology. Typical data rates for SX are approximately 6000 bits per second. One

may select various data rates from approximately 3.7 to 7.8Kbps to manage speech quality versus allotted memory.

Speech, music and sound effects may also be produced using the RSC-4128 8 bit, 58Kbps or 4 bit, 30Kbps

compression technologies.

The RSC-4128 provides high-quality, eight-voice, wave table music synthesis which allows multiple, simultaneous

instruments for harmonizing. The RSC-4128 uses a MIDI-like system to generate music. One or more of the eight

voices may be speech playback instead of music. One or more of the eight voices may be a drum track comprising

multiple drums. In effect, this allows the number of simultaneous instruments to exceed 8.

Speech and music synthesis requires on-chip or off-chip ROM to store data for synthesis playback. Easy to use

tools allow the developer to record and compress their own voice talents and create with the push of a button, or to

create their own MIDI scores and instruments.

Record and Playback

The RSC-4128 can perform speech record and playback (sometimes called “voice memo”) at various compression

levels depending on the quantity and quality of playback desired. Data rates less than 14,000 bits per second are

achievable while maintaining very high quality reproduction. The record and playback technology also performs

silence removal to improve sound quality and reduce memory requirements.

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