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Trigence delivers hi-fi audio output at reduced power

Posted: 04 Jun 2014 ?? ?Print Version ?Bookmark and Share

Keywords:DSM? analogue? audio? amplifier? Dnote?

Trigence Semiconductor staged the latest demonstration of its digital speaker modules (DSM) at Computex 2014. The DSM boasts a performance that matches traditional analogue amplifier solutions, while reducing the active power requirement of the audio output stage to as little as 30 per cent of a comparable analogue D-Class amplifier driven solution.

It combines Trigence's Dnote digital amplifier IC solutions with micro-speakers from AAC Technologies, and contains six voice-coils in a thin tablet form-factor. This enables the DSM to achieve sound pressure levels (SPL) exceeding 87dB at typical listening positions. The DSM demonstration system was developed in conjunction with Intel Corporation, and incorporates Sound Edge technology from Sound Research Corporation.

The DSM both extends battery life and simplifies the system-level architecture, requiring routing and consideration of only digital signals operating from a single 5V supply rail, and needing no high-voltage components in the support circuitry.

The Dnote technology utilises specially adapted delta-sigma techniques to overcome manufacturing mismatches in the speaker voice-coils whilst driving only the number of coils necessary to achieve a given dynamic SPL requirement. The result is a high fidelity audio output that consumes as little as 30 per cent of the battery power needed by traditional output stages.

Dnote technology

Prior to DSMs, system designers were required to develop, test and refine a dedicated audio amplifier and conditioning PCB based on analogue D-Class amplifier solutions. These audio boards typically need multiple power rails or boost-supply circuits, and incorporate a mix of expensive high-voltage components. Significant care is needed in the routing and shielding the analogue signals on such boards in order to minimise EMI and maintain an acceptable audio experience.

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