Comments on: PyS60 DTMF Detector

By: Abilash ov frm india

Abilash ov frm india — Sun, 12 Feb 2012 17:22:24 +0000

Abilash ov-fb iam on fb pls help me

By: Abilash ov frm india

Abilash ov frm india — Sun, 12 Feb 2012 17:20:41 +0000

Hai Conatic whr ru frm.I like python.Can you help me.I need a app to controll a phone via phone call.If i pressed 1,2 respectively a app will run.Can you help me to make this

By: conatic

conatic — Fri, 10 Feb 2012 15:51:42 +0000

I have tried to decode a number with 2 same digits one after another one and the program doesn’t decode the second digit. On this website there is a link to a good dtfm
detector : http://aluigi.org/mytoolz.htm

By: Abilash ov frm india -kerala

Abilash ov frm india -kerala — Tue, 03 Jan 2012 07:50:45 +0000

Hai, iam from india.Iam a plus two student.Now iam learning python.Can you give me a simple dtmf app.If i can controll another s60 via my phone

By: Vishal

Vishal — Wed, 14 Dec 2011 10:47:45 +0000

Hi,

Sorry to post a question on old chain.

Can I please know, what item corresponds to “GOERTZEL_N” in Goertzel algorithm? Is it normalizedfreq?

Also, if we want to calculate in “normalizedfreq = freq / SAMPLEFREQUENCY;” for Goertzel algorithm, I assume “freq” is nAvgBytesPerSec and “SAMPLEFREQUENCY” is nSamplesPerSec in FMT chunk wav file. Please correct if I am wrong.

Using this I am trying to understand what should be the correct value for GOERTZEL_N to be used in your python script.

Thanks.

By: SteveK

SteveK — Wed, 24 Aug 2011 01:11:43 +0000

I had the same problem. The only audio samples I could get to work were 16 bit 8k sampling mono.
Once I used the correct format, this error went away.

By: etherton

etherton — Wed, 03 Aug 2011 05:50:07 +0000

It’s in the blog post. I was using 2.2.

By: Bharat Goyal

Bharat Goyal — Wed, 03 Aug 2011 05:48:34 +0000

What version of python you ran it onto?

By: etherton

etherton — Wed, 03 Aug 2011 02:53:41 +0000

So I honestly don’t understand the math in the Goertzel algorithm well enough to know exactly what you should do, so I’d start by setting self.SAMPLING_RATE to 11025 and then try playing with the self.GOERTZEL_N between 92 and 210 until it works.

For the error regarding unpack. Do you know what raw contains when it’s passed into struct.unpack()? I suspect you’re using a newer version of python than when I wrote the library, and maybe file.readframes(1) is returning something different.

By: Bharat Goyal

Bharat Goyal — Tue, 02 Aug 2011 06:35:55 +0000

I have been trying this for a while. Is it necessary to have the audio samples at 8/16 KHz.. I have testing it for a file having an audio sample at 11025 Hz, also I get errors with the variable ‘raw’ -

line 324, in getDTMFfromWAV
(sample,) = struct.unpack(“h”, raw)
error: unpack requires a string argument of length 2