CML Microcircuits has released the EV6550DHAT, a Hardware Attached on Top (HAT) for Raspberry Pi that integrates the low-power voice capabilities of the CMX655D codec. Designed for digital voice and sensor applications, the single-chip CMX655D codec covers the entire signal chain through:
- Dual-Matched Digital MEMS Microphones
- A 1 W Class D Speaker Driver with Decimation, Filtering, Signal Processing, and Digital Gain
- An I2S/PCM Audio Interface
- SPI Control Interface
The EV6550DHAT is compatible with the 40-pin extended GPIO connector, allowing ultra-low-power voice coding and decoding to be easily added to and powered by Raspberry Pi devices. The HAT also supports external power sources.
The systems is packaged with pre-recorded sample files, and able to record and playback .wav audio files at different sample rates and levels. Support for open source GUI software such as GTK3+ and GLADE allow users to interface with the CMX655D and quickly configure sample rates (8, 16, 32, or 48 ksamples per second), dB levels (-12 dB to +3 dB), or volume (-90 db to 0 dB).
Muting and smoothing functionality is also supported.
The EV6550DHAT is available now from Digi-Key and Mouser. For more information, visit www.cmlmicro.com/products/cmx655d-ultra-low-power-voice-codec/?s=CMX655D.
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