WM2000: Handset receiver speaker driver with ambient noise cancellation

Description

The WM2000 is a low power, high quality handset receiver speaker driver with Wolfson myZone™ Ambient Noise Cancellation (ANC). It provides enhanced voice communication quality in a noisy environment if the handset acoustics are designed appropriately.

The device integrates into the handset output signal path with minimal architectural changes. WM2000 drives the receiver speaker directly.

The Wolfson myZone™ (ANC) engine uses an adaptive filtering algorithm which requires one or two dedicated analogue microphones. The filtering algorithm can be adapted to the handset's acoustic characteristics for optimum noise cancellation performance. A dynamic control algorithm adjusts ANC parameters for variations in ambient noise levels.

High power supply rejection allows WM2000 to operate in a noisy electrical environment without degrading signal quality. The device is controlled via registers which can be accessed using a 2-wire serial control interface. A pre-configured Internal Sequencer controls the internal hardware such that a single register write can be used to perform key analogue sequences during power up / power down or mode transition.