From 0ffd44f3fd1647f9644949a061a43520f5af4743 Mon Sep 17 00:00:00 2001 From: Joris van Rantwijk Date: Wed, 22 Jan 2014 23:10:23 +0100 Subject: [PATCH] More pilot frequency measurements. --- FmDecode.cc | 2 +- NOTES.txt | 7 +++++-- 2 files changed, 6 insertions(+), 3 deletions(-) diff --git a/FmDecode.cc b/FmDecode.cc index a8ac7c9..547800c 100644 --- a/FmDecode.cc +++ b/FmDecode.cc @@ -309,7 +309,7 @@ FmDecoder::FmDecoder(double sample_rate_if, , m_dcblock_mono(30.0 / sample_rate_pcm) , m_dcblock_stereo(30.0 / sample_rate_pcm) - // Construct LowwPassFilterRC + // Construct LowPassFilterRC , m_deemph_mono( (deemphasis == 0) ? 1.0 : (deemphasis * sample_rate_pcm * 1.0e-6)) , m_deemph_stereo( diff --git a/NOTES.txt b/NOTES.txt index b3e6b2c..10b8a6a 100644 --- a/NOTES.txt +++ b/NOTES.txt @@ -177,7 +177,10 @@ Stereo pilot frequency Measuring 19 kHz pilot frequency vs Internet NTP (ADSL): -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) +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) +radio538 19 kHz pilot = 18999.78 Hz +- 0.04 Hz (6 hours measurement) + +Conclusion: stereo pilot is not a reliable time source. --