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More pilot frequency measurements.

This commit is contained in:
Joris van Rantwijk 2014-01-22 23:10:23 +01:00
parent fda975b1ff
commit 0ffd44f3fd
2 changed files with 6 additions and 3 deletions
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2
FmDecode.cc
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@ -309,7 +309,7 @@ FmDecoder::FmDecoder(double sample_rate_if,
, m_dcblock_mono(30.0 / sample_rate_pcm) , m_dcblock_mono(30.0 / sample_rate_pcm)
, m_dcblock_stereo(30.0 / sample_rate_pcm) , m_dcblock_stereo(30.0 / sample_rate_pcm)
// Construct LowwPassFilterRC // Construct LowPassFilterRC
, m_deemph_mono( , m_deemph_mono(
(deemphasis == 0) ? 1.0 : (deemphasis * sample_rate_pcm * 1.0e-6)) (deemphasis == 0) ? 1.0 : (deemphasis * sample_rate_pcm * 1.0e-6))
, m_deemph_stereo( , m_deemph_stereo(

7
NOTES.txt
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@ -177,7 +177,10 @@ Stereo pilot frequency
Measuring 19 kHz pilot frequency vs Internet NTP (ADSL): Measuring 19 kHz pilot frequency vs Internet NTP (ADSL):
radio2 19 kHz pilot = 18999.79 Hz +- 0.04 Hz (7 hours measurement) radio2 19 kHz pilot = 18999.79 Hz +- 0.04 Hz (7 hours measurement)
radio3 19 kHz pilot = 18999.8 Hz +- 0.05 Hz (5 hours measurement) radio3 19 kHz pilot = 18999.8 Hz +- 0.05 Hz (5 hours measurement)
radio538 19 kHz pilot = 18999.78 Hz +- 0.04 Hz (6 hours measurement)
Conclusion: stereo pilot is not a reliable time source.
-- --