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Author Topic: OBI212 Bug Releasing Line Port ?  (Read 2176 times)
drgeoff
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« Reply #20 on: October 12, 2018, 11:00:14 am »


Recorded Audio File: http://209.160.64.39/record.au
Analysis of that file.
Left channel. Incoming from POTS line?
The tone in the section between 17.5 and 45 seconds of that file is 480 Hz @ -27.6 dB. Continuous.
Between 45 and 75 seconds.  Begins with about 1 second of 2000 Hz @ -15.7 dB continuous.  In the remainder the predominant tones are 478 Hz @ -18.3 and 517 Hz @ -20.6 dB continuous.
Between 75 seconds and 105 seconds predominant tones are 1399 Hz @ -18.1 dB, 2048 Hz @ -18.1, 2451 Hz @ -19.3 and 2602 Hz @ 19.4 dB.  Repeated interrupted - 0.1 seconds on together, 0.1 seconds off together.

Right channel.  Outgoing from phone microphone?
Low level.  Sound from TV in the room?  Some clicks just before the the end.

Despite the apparent precision of the frequency and level numbers, regard them as approximate.

Hard to relate the above to what is in https://www.itu.int/ITU-T/inr/forms/files/tones-0203.pdf
« Last Edit: October 12, 2018, 11:04:22 am by drgeoff » Logged
dboling
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Posts: 61



« Reply #21 on: October 12, 2018, 11:27:57 am »


Recorded Audio File: http://209.160.64.39/record.au
Analysis of that file.
Left channel. Incoming from POTS line?
The tone in the section between 17.5 and 45 seconds of that file is 480 Hz @ -27.6 dB. Continuous.
Between 45 and 75 seconds.  Begins with about 1 second of 2000 Hz @ -15.7 dB continuous.  In the remainder the predominant tones are 478 Hz @ -18.3 and 517 Hz @ -20.6 dB continuous.
Between 75 seconds and 105 seconds predominant tones are 1399 Hz @ -18.1 dB, 2048 Hz @ -18.1, 2451 Hz @ -19.3 and 2602 Hz @ 19.4 dB.  Repeated interrupted - 0.1 seconds on together, 0.1 seconds off together.

Right channel.  Outgoing from phone microphone?
Low level.  Sound from TV in the room?  Some clicks just before the the end.

Despite the apparent precision of the frequency and level numbers, regard them as approximate.

Hard to relate the above to what is in https://www.itu.int/ITU-T/inr/forms/files/tones-0203.pdf

I didn't think to mute the phone receiver or turn the mute the television.

How are you analyzing the record.au file ?

It almost seems I could use the long tone at the beginning as a disconnect ?

I found a site that lists standard tones through out the world at https://www.3amsystems.com/World_Tone_Database?q=United_States,Disconnect_tone
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-Diane
drgeoff
Hero Member & Beta Tester
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Posts: 3693


« Reply #22 on: October 12, 2018, 11:47:01 am »

Open the file with Audacity.  Select the time portion you want to analyse. Click 'Analyze' on the top horizontal list, select 'Plot Spectrum', select 'Spectrum' from the Algorithm choices.
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