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The
PSoC-Based Audio Analyzer consists of two major functional
blocks: a white noise generator to act as a broadband
stimulus, and an eight-band spectral analyzer to measure
the frequency-specific system response and display the
results. The analyzer is built around the PSoC CY8C26443.
White noise is generated by clocking a 24-bit, pseudo-random
sequence generator at 40 KHz, and then moving the lower
six bits to the input of a DAC. This produces a randomly
fluctuating analog output with spectral components up
to 20 KHz and a repetition rate of 7 min. An FFT of the
data shows a frequency spectrum with a flat response of
20 KHz.
A
stereo patch cable is run between the RCA jacks on the
side of the analyzer to an appropriate input on the rear
of the amplifier being tested. Then, the stereo is turned
on and the input selected. While standing in the desired
listening location, the user turns on the analyzer and
selects the stereo channel to test. As white noise emits
from the speaker, the user adjusts the equalizer settings
on the amplifier until a flat response is observed on
the display.
Jerry
Wasinger
Norcross, GA, U.S.
webmaster@web-ee.com
Abstract
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Full entry &
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