音频分析测试仪AMC选件

音频分析测试仪AMC选件：

Sync

The SYNC input connector permits clock synchronization of the APX master clock to an external clock source, such as a “house sync” for a 10 MHz lab standard clock source, or a master clock from a development board of a part under test. The SYNC output connector supplies a clock signal typically used to slave an external device to the master clock of the APx analyzer.

AES11 DARS Reference

The rear-panel XLR connectors support AES11 Digital Audio Reference Signal, a standard for professional audio sample rate synchronization. APx provides “audio black” at the output connector, conforming to AES3 (IEC60958-4), designed to connect to devices with AES3 XLR reference input. The input XLR synchronizes the APx master clock to an external device.

音频分析测试仪AMC选件

Jitter

The AMC module adds sophisticated jitter generation and analysis capabilities to support APx digital audio interface options, including Digital Serial I/O (APX-DSIO), Advanced Digital I/O (APX-ADIO), and PDM (APX-PDM). The jitter generator provides a jittered master clock to the rear panel SYNC OUT and AES11 DARS REFERENCE OUT connectors to drive external devices.

The AMC jitter generator produces a jittered master clock that may be selected to drive APx ADIO, DSIO, PDM, and Sync/Ref outputs. The jitter analyzer demodulates clock inputs from ADIO, DSIO, or PDM inputs. APx software then performs measurements on the demodulated jitter signal.

APx software supports sweeps of jitter level and frequency, choice of jitter waveforms (sine, noise, square), and jitter measurements including time and frequency domain analysis. Jitter may be measured with all the meters traditionally associated with audio signals. The figure below graphs jitter tolerance of a PDM amplifier (output distortion increases with jitter) using nested jitter amplitude and frequency sweeps. More information on jitter.

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