From 3938ba31f633d48bb6f4471a3f49ab696a453aee Mon Sep 17 00:00:00 2001 From: Vasile Vilvoiu Date: Thu, 15 Jul 2021 18:34:35 +0300 Subject: Fix small typos in README file. Closes #7. --- README.md | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/README.md b/README.md index 509777d..0515af6 100644 --- a/README.md +++ b/README.md @@ -134,6 +134,10 @@ Usually, a larger FFT window will give better frequency resolution but worse tim A smaller stride will give a *smoother* and richer output, but will strain the CPU more. +**NOTE:** You will notice that there isn't much difference between the output of the above command and the others. +That is because the display width is different from the FFT window width. +To change the display width, see **Display Options** below. + Lastly, if you encounter high sample rate signals, for which you can't display a wide enough (or often enough) window, you can use window averaging (```-A, --average```). ```bash @@ -146,8 +150,6 @@ Averaging 20 windows gives us a much more reasonable 47 windows per second. ### Display options -You will notice that there isn't much difference between the output of the above command and the others. -That is because the display width is different from the FFT window width. To change the display width we can use ```-w, --width```: ```bash @@ -155,7 +157,7 @@ $ parec --channels=1 --device="${PASOURCE}" --raw | specgram -l -f 1024 -w 1024 ``` As you will notice, the spectrogram is somewhat blurry, because the program is resampling the 513 element wide positive part of the FFT output to the display width of 1024. -If you need sharp, crisp spectrograms, then you can use the ```-q, --no_resampling``` to disable resampling: +If you need sharp, crisp spectrograms, then you can use ```-q, --no_resampling``` to disable resampling: ```bash $ parec --channels=1 --device="${PASOURCE}" --raw | specgram -lq -f 1024 -- cgit v1.2.3