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New APx audio analyzer option delivers unprecedented 24-bit resolution when measuring out-of-band noise in Class-D amps & other modern audio devices Audio Precision, the recognized standard in audio test and measurement, today marked its 25th year in business by introducing a new ultra-high bandwidth analyzer option for the APx525 family of audio analyzers. The BW52 High Bandwidth option extends the APx’s FFT (Fast Fourier Transform) capability all the way to 1 megahertz, with 24-bit amplitude resolution and 2 Hz frequency resolution, making APx ideal for looking at out-of-band noise in Class-D amplifiers, sigma-delta converters and other modern audio devices. By comparison, other audio analyzers have a maximum FFT bandwidth of 250 kHz or less, making them unsuitable for looking at switching frequencies that often center around 300-500 kHz. RF (Radio Frequency) spectrum analyzers can have much wider bandwidth, but their low impedance, low resolution and low tolerance to high input levels again make them unsuitable for audio design. Compared to the previous state of the art, an FFT of this length and resolution is like trading a pair of reading glasses for the Hubble telescope, says Bruce Hofer, Chairman and co-founder of Audio Precision. It’s a real achievement, and a great way to mark our 25 year anniversary. The BW52 is supported by the following models of APx: APx520, 521, 525 and 526. The option will be available in January 2010.
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