From 6baf067a79b2eb95d7011510efad754d88544199 Mon Sep 17 00:00:00 2001 From: Denny Sheirer Date: Sun, 3 Aug 2025 06:33:45 -0400 Subject: [PATCH] Updated Playlist Editor (markdown) --- Playlist-Editor.md | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Playlist-Editor.md b/Playlist-Editor.md index 2296d2e..2d1b7bb 100644 --- a/Playlist-Editor.md +++ b/Playlist-Editor.md @@ -926,7 +926,7 @@ The noise squelch view contains the following controls: #### Operation: * Concept: the noise squelch control operates on the 'quieting effect' of FM modulated signals. When transmitting, the noise level in the FM demodulated audio is greatly reduced and the transmitted audio is usually in the range of 0 - 4,000 Hertz. When there is no signal present, the FM demodulated audio is filled with random noise. The squelch control measures the statistical variance of the demodulated audio in 10 millisecond windows and then compares the variance against the open and close thresholds to determine when to open and close the squelch. The squelch control uses an audio buffer longer than the open and close hysteresis duration thresholds to ensure that no audio is lost while calculating when to open or close the squelch. -**Note:** the noise squelch view displays the channel noise in the range of 0.0 to 10.0. When a signal is present, the noise level will be displayed as a value close to 10.0 and it will display a randomly changing value in the range 2.0 to 6.0 when there is no signal present. The actual noise values used in the squelch control range from 0.0 to 0.2 for a signal (ie quite/minimal variance) and 0.2 to 0.5 for no signal. This conversion of actual noise value to displayed noise value is intentional to align the visual representation of the noise and hysteresis values on the X/Y graph/chart and present the information in an intuitive display where both values transition from low (no signal) to high (signal present). +**Note:** the noise squelch view displays the channel noise in the range of 0.0 to 10.0. When a signal is present, the noise level will be displayed as a value close to 10.0 and it will display a randomly changing value in the range 2.0 to 6.0 when there is no signal present. The actual noise values used in the squelch control range from 0.0 to 0.2 for a signal (ie quiet/minimal variance) and 0.2 to 0.5 for no signal (full random noise). This conversion of actual noise value to displayed noise value is intentional to align the visual presentation of the noise and hysteresis values on the X/Y graph/chart and present the information in an intuitive manner where both values transition from low (no signal) to high (signal present) and the scaling of the values is also aligned. * Open Squelch: the audio squelch will open and pass audio once the noise level is above the noise open threshold for a combined period of time that is longer than the hysteresis open threshold. The hysteresis value is units of 10 milliseconds. * Close Squelch: the audio squelch will close and mute audio once the noise level drops below the noise close threshold for a combined period of time that is longer than the hysteresis close threshold.