EMBEDDED TECHNOLOGY FEATURE
DO YOU READ ME? Enabling advanced voice coding
and decoding for Raspberry Pi C
ML Microcircuits hopes to contribute to Raspberry Pi’s ambitions to enable
and enhance the current and next generation of circuit designers, through the integration of the EV6550DHAT – a Raspberry Pi Hardware Attached on Top (HAT) compatible evaluation and development board that makes available the features and benefits of its CMX655D ultra-low power voice codec to hobbyists, developers and product manufacturers alike. The famous Raspberry Pi single board computer has long been in the spotlight, standing out as the platform on which hardware and software can be designed and developed at speed. The EV6550DHAT builds on this growing ecosystem by bringing the advanced features of the CMX655D voice codec to the Raspberry Pi community.
Highlighting its significance, the CMX655D has been developed for digital voice and sensor applications. It integrates the entire signal chain, from dual matched digital MEMS microphone interfaces, to a 1W Class D speaker driver, incorporating decimation, filtering, signal processing and digital gain, supported by an I2S/PCM audio interface and SPI control interface. Its relevance to Raspberry Pi is as such: it represents a single-chip, ultra-low power solution for adding voice coding/decoding to any application. This ultra-low power factor is
attributed to the HAT’s compatibility with any Raspberry Pi with a 40-pin extended GPIO connector, and the subsequent possibility for it to be powered by the Raspberry Pi. It also supports an external power source if other HATs or peripherals
are being used, and limits the total power available from the host USB interface. “The Raspberry Pi is the perfect
platform to demonstrate the capabilities of the CMX655D without much development effort,” commented David Brooke, product manager, CML Microcircuits: “The entire team has been excited by the prospect of bringing advanced voice codec capability to Raspberry Pi.”
CML Microcircuits
www.cmlmicro.com
/ ELECTRONICS
ELECTRONICS | DECEMBER/JANUARY 2020
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