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Epson`s new Voice/Audio single chip MCU solution – S1C31D50

In a lot of applications, the developer spends a lot of time to implement machine to human communication. LEDs or piezo buzzer signals are suitable as simple alerts but for a more complex need of information or alarms often displays are used.

Epson`s Voice/Audio IC S1C31D50 will be a simple solution for complex machine to human communication.

S1C31D50 Key facts

  • Cortex-M0+ with 192kB internal Flash for Sound EOV file and application running up to 16Mhz
  • Sound HW processor w/ 2-ch mixing & voice speed conversion
  • QSPI Flash interface to extend the audio up to 120 min.
  • Serial interfaces like SPI, UARTs, I2C & 12 Bit ADC
  • Wide VDD range of 1.8V up to 5.5V



Key benefits:

  • Easy to combine Music, Sound Effects and Prerecorded Voice Data
  • Voice/Audio Data Minimization function
  • Highly compressed Voice/Audio data algorithim & HW decoder
  • Easy to Play Voice/Audio data

Just set a sentence number by application program

  • 2ch Mixing Play & 2ch Volume Control HW
  • Voice Speed/Pitch Conversion HW
  • Recording function is also supported by SW (MCU) – New Way: Epson Voice Creation Tool by PC only compared to Studio recording
  • EOV compress voice data 4 Times better than ADPCM


Why not inform the user about current status or alarm in his well-known spoken language?

This might be a question the designer has in mind often but sound production and integration in the application seems just as elaborate as the use of a display.

But now with Epson’s Voice/Audio device tool chain this has become very easy:

Epson gives the developer a simple to use text-to-speech tool (Esper II – free of charge) to generate highly compressed voice data. Decoded by the S1C31D50, a natural sounding and clearly articulated voice becomes audible. An integrated audio hardware processor, DAC and 2 channel mixer makes it easy to connect an amplifier and speaker depending on the needs of the application.

PC Tool Esper II facts

  • Guided voice data production process in 4 steps
  • German, English, French, Italian, Spanish, Russian & several Asian language support
  • Pronunciation fine tune possible
  • Only 120kB/min with 16bit Sampling



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