From 0c68c486ec09da471c27b6f4d658ae0ba8f861b7 Mon Sep 17 00:00:00 2001
From: Josh Blum <josh@joshknows.com>
Date: Mon, 31 Aug 2009 18:18:22 -0700
Subject: Modified log power fft block so ref scale is peak to peak. Tweaked
fft sink autoscale routine to come up with better numbers. Modified scope
sink ac couple block to use constant tap. The previous tap calculation would
cause failure for very small sample rates.
---
gnuradio-core/src/python/gnuradio/blks2impl/logpwrfft.py | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
(limited to 'gnuradio-core/src')
diff --git a/gnuradio-core/src/python/gnuradio/blks2impl/logpwrfft.py b/gnuradio-core/src/python/gnuradio/blks2impl/logpwrfft.py
index cf8eb1be78..7ef40be40a 100644
--- a/gnuradio-core/src/python/gnuradio/blks2impl/logpwrfft.py
+++ b/gnuradio-core/src/python/gnuradio/blks2impl/logpwrfft.py
@@ -55,9 +55,9 @@ class _logpwrfft_base(gr.hier_block2):
c2mag = gr.complex_to_mag(fft_size)
self._avg = gr.single_pole_iir_filter_ff(1.0, fft_size)
self._log = gr.nlog10_ff(20, fft_size,
- -10*math.log10(fft_size) # Adjust for number of bins
+ -20*math.log10(fft_size) # Adjust for number of bins
-10*math.log10(window_power/fft_size) # Adjust for windowing loss
- -20*math.log10(ref_scale/2)) # Adjust for reference scale
+ -20*math.log10(ref_scale/2)+3.0) # Adjust for reference scale
self.connect(self, self._sd, fft, c2mag, self._avg, self._log, self)
self._average = average
--
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