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Maxim > Design Support > Technical Documents > Application Notes > Audio Circuits > APP 5148
Keywords: Skype, speakerphone, TV, long range, register settings, audio codec
APPLICATION NOTE 5148
Device Configuration for Skype Long-Range Speakerphone and TV Applications
By: Evan Ragsdale
Oct 17, 2011
Abstract:
The MAX9860
audio voice codec provides an ideal solution for Skype® long-range audio-capture applications and enables high-quality voice transmission. Target
applications include Skype for TV, set-top boxes, and speakerphones. By providing a flexible range of programmable gain settings and accepting sample rates up to 48kHz, the
MAX9860 amplifies analog microphone signals and converts them to digital audio with performance in mind. In addition, the MAX9860's two microphone inputs allow the
application to record from a two-microphone or four-microphone array using a beamforming algorithm for directional sensitivity and noise cancellation.
Introduction
The MAX9860 provides all the necessary system blocks and features to be used in a Skype voice-capture application. Any gain can be
selected from 0dB to 50dB (using 1dB steps) between the microphone input pins and the internal analog-to-digital converter (ADC) (Figure
1). An additional gain of -12dB to +3dB can be selected at the output of the ADC. The output of the device's digital audio interface
conforms to the standard I²S, left-justified, or TDM protocol for communication with the system's application processor. All settings are
programmed though a 2-wire I²C compatible interface.
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