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Audio DSP codecs offer improved voice control, sound quality

22 Sep 2014

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DSP codecs—DA7322 and DA7323—aimed at applications with up to four analogue or digital microphones, respectively.

Touting the highest levels of audio digital signal processor (DSP) functionality with a minimum power consumption requirement, these products are specifically developed for voice-centric applications found in the latest generation of tablets, wearables, webcam accessories, and in-vehicle entertainment.

The audio codecs incorporate an integrated 24bit DSP with an advanced voice engine package that provides an improvement of over 35dB signal-to-noise ratio (SNR) through the use of multi-channel beamforming, noise suppression, and acoustic echo cancellation features. The result is a significant enhancement in speech performance with improved sound quality for VoIP and voice recognition applications, which is particularly important for end users in a noisy environment, according to the company.

Targeting wearables, a low power voice trigger is available on the DA7322 and DA7323 where over a dozen keywords can be supported with over 95 per cent accuracy without false triggering. This capability is demonstrated by the TrulyHandsfree always-on voice activation and recognition software provided by Sensory, which includes trigger to search, user-defined triggers, speaker verification, and identification and multiple language support.

Beamforming technology built into the DA7322 and DA7323 voice engine package has been designed to offer maximum flexibility in terms of microphone placements in order to support both endfire and multi-MIC configurations. The beamforming algorithm also has the ability to 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 equalisation 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 levelling offers more perceived loudness and consistent audio levels.

The advanced accessory detection integrated on the codecs supports 3- or 4-pole jack detection. The device can, therefore, automatically detect the type of headset being used, without the need for any external adapters. The DA7322 can support four analogue microphones. The DA7323, by contrast, offers support for three analogue or two pairs of stereo digital microphones.

The codecs each come in a 66 bump WL-CSP package.

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