DSP Codecs Use Beamforming to Optimize Voice Signals

DSP Codecs Use Beamforming to Optimize Voice Signals

The DA7322 and DA7323, two new audio digital-signal-processing (DSP) codecs developed by Dialog, suit voice-centric systems that contain up to four microphones. The DA7322 supports four analog microphones, while the DA7323 handles three analog or two pairs of stereo digital microphones.

The codecs incorporate an integrated 24-bit DSP with an advanced voice engine package that boosts signal-to-noise ratio (SNR) to over 35 dB through the use of multichannel beamforming, noise suppression, and acoustic echo cancellation features. As a result, they improve sound quality for VoIP and voice recognition applications, particularly in noisy environments.

A low power voice trigger supports over a dozen keywords with over 95% accuracy without false triggering.

Beamforming offers flexibility of microphone placement, supporting both endfire and multi-MIC configurations. In addition, its algorithm can suppress a variety of stationary and non-stationary noise sources.

The embedded DSP engine includes a suite of audio-enhancement SmartEffects ranging from multi-band equalization to stereo widening. It also contains a psychoacoustic bass boost that can be enabled to improve perceived low-frequency response for playback on low-cost speakers, while dynamic range control and volume leveling offers more perceived loudness and consistent audio levels.

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