March 9, 2012

New PDM I/O Option for Audio Analyzers Enables Comprehensive Testing

Audio Precision has announced availability of its new PDM I/O option for its APx500 series audio analyzers.

PDM (pulse density modulation) is a one-bit, high clock rate data stream used with digital MEMS (Micro-Electro-Mechanical System) microphones used extensively in smartphone design. The APx PDM option allows APx500 series audio analyzers to connect directly to any device with a PDM input or output, enabling comprehensive testing of audio in the fast-moving telecom industry.

In addition to all the standard audio measurements, the APx PDM Interface provides variable DC supply voltage, variable sample rate, and a PSR (power supply rejection) measurement to test the device’s full operating parameters. PDM (mono or stereo) can be selected for both the analyzer inputs and outputs simultaneously, and PDM can be paired with any of the other available I/O formats: analog, AES, S/PDIF, Bluetooth, HDMI, or serial digital.

PDM and MEMS microphones – Semiconductor R&D engineers working on new digital MEMS designs can take immediate advantage of the APx PDM option, generating modulated PDM bitstreams and sending them directly to decimation stages with no further conversion or hardware. Smartphone and tablet manufacturers working on new designs can interface directly with MEMS microphones and PDM decimation stages to tune and verify performance. A special acoustic response suite of measurements makes MEMS transducer testing fast, easy, and efficient, even in non-anechoic environments.
 APx analyzers are the ideal platform for complete smartphone and tablet audio development, combining PDM with an integrated Bluetooth testing solution, low noise analog for testing headphone outputs, digital serial (I2S) for direct chip-level communication, and HDMI for devices with HD video capabilities, says the company.

“Good design demands comprehensive testing, and AP is always working to make certain that our customers have the complete set of tools necessary to create those designs,” explains Tom Kite, Audio Precision’s VP of engineering. “PDM is now a critical element of cutting-edge work in the mobile industry, and AP is bringing world class test and measurement to this arena.”

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