SLC receiving site information
Salt Lake City Receiver Audio Equalization
Receiver audio frequency response equalization
Saturday, July 9, 2005, the AudioControl C-101 Series
Two 10-band audio equalizer shown above was installed between the Salt
Lake City Kenwood R-5000 receiver and the Windows Media Encoder that generates
the receiver audio stream.
Audio Equalization
Without equalization the Kenwood R-5000 audio response drops 12 dB
per octave below 240 Hz, rises 9 dB from 240 Hz to 1.92 kHz,
and drops 21 dB per octave above 1.92 kHz in LSB
mode. With equalization the frequency response drops 12 db
per octave below 120 Hz, is flat within 2 dB from 120 Hz
to 1.92 kHz, and drops 12 dB per octave above 1.92 kHz.
The red led plot above shows the overall equalized response. The end-effect
is better-sounding Salt Lake City receiver audio.
This is close-up view of the audio frequency-response
plot. Note that because the view is looking down, rather that straight-on,
there is about 2 dB of calibration-scale parallax.
Frequency-Response Measurement Method
The overall frequency response was measured by modulating an LSB
test generator set to 3750 kHz with white noise (the AudioControl C-101
has a built-in white noise generator), tuning the Kenwood R-5000 receiver
to the test-generator frequency in LSB mode, and plotting the frequency
response of the equalized audio with the spectrum analyzer that is built-in
to the AudioControl C-101.
This page was last modified: Tue, 31 Aug 2010 03:01:15 GMT
|
