bert2 / dtmfdetection Goto Github PK

I'm unable to run both the samples
How to detect DTMF tones through mic in, but with each audio channel analyzed separately and
How to detect DTMF tones in the current audio output
and i suspect there is something not working in LiveAudioDtmfAnalyzer

I am testing playing DTMF sound from cell phone app and the site http://onlinetonegenerator.com/dtmf.html

I am placing cell phone in front of my external microphone, as well of the speaker of my PC if I use the generator online.

Please consider that:

• If I just use N-Audio, I am able to obtain correctly data from WaveInEvent micIn, and execute, for example, the FFT - so I have no doubt that my microphone is working correctly with N-Audio acquisition.

• When testing scenario How to detect DTMF tones in the current audio output I have activated the listening of the microphone input in Windows audio properties.

• If i use the example named How to print all DTMF tones in an MP3 file, but with each audio channel analyzed separately: it works well.

I hope this can help you to improve your library!

Thanks and regards,
Francesco

Expected Behavior

I'm expecting DtmfToneStarted and DtmfToneStopped events are raised.

Current Behavior

DtmfToneStarted and DtmfToneStopped events are never raised.

Hi @bert2 ,

I've been trying to upgrade NAudio package to the latest release (2.1.0) using dotnet add package NAudio --version 2.1.0 in the below three csproj:

unit.csproj
integration.csproj
dtmf-detector.csproj
DtmfDetection.NAudio.csproj

Is that sufficient to claim that DtmfDetection.NAudio is using the latest NAudio version ?

Is it possible to implement this procedure in the current dll ? If so, could you please send me a sample code?

Hi @bert2

Is it possible to change the detection frequency, or process by T seconds intervals ?

By default, the DTMF duration is 40ms. But sometimes it can be 60, 70, or even 80ms.

So the precision of the result depends on the number of detection per seconds.

Is there a way to modify it with DtmfDetection, or is it fixed?

Hello @bert2

First of all, thanks for this great project.

I'm trying to compile it for Linux, and even though I installed dotnet, powershell, and all, I keep getting the following error:

./build.ps1
Preparing to run build script...
Running build script...
**Error: Failed to install addin 'Cake.Git'.**

And with verbose, I get that :

Installing addins...
  CACHE https://api.nuget.org/v3/registration5-gz-semver2/cake.codecov/index.json
The addin Cake.Codecov will reference Cake.Codecov.dll.
  CACHE https://api.nuget.org/v3/registration5-gz-semver2/cake.git/index.json
Assemblies not found for tfm .NETFramework,Version=v4.6.1 and rid [NULL].
No assemblies found after running content resolver.
Error: Cake.Core.CakeException: Failed to install addin 'Cake.Git'.
  at Cake.Core.Scripting.ScriptProcessor.InstallAddins (System.Collections.Generic.IReadOnlyCollection`1[T] addins, Cake.Core.IO.DirectoryPath installPath) [0x000c0] in <040622b6758f456b89fd2a5b24e3e64c>:0
  at Cake.Core.Scripting.ScriptRunner.Run (Cake.Core.Scripting.IScriptHost host, Cake.Core.IO.FilePath scriptPath) [0x0013b] in <040622b6758f456b89fd2a5b24e3e64c>:0
  at Cake.Features.Building.BuildFeature.RunCore (Spectre.Console.Cli.IRemainingArguments arguments, Cake.Features.Building.BuildFeatureSettings settings) [0x0010d] in <21a7d41a88904b88a0986b85ed354c53>:0
  at Cake.Features.Building.BuildFeature.Run (Spectre.Console.Cli.IRemainingArguments arguments, Cake.Features.Building.BuildFeatureSettings settings) [0x00012] in <21a7d41a88904b88a0986b85ed354c53>:0
  at Cake.Commands.DefaultCommand.Execute (Spectre.Console.Cli.CommandContext context, Cake.Commands.DefaultCommandSettings settings) [0x000d0] in <21a7d41a88904b88a0986b85ed354c53>:0

My dotnet info :

dotnet --info
.NET SDK (reflecting any global.json):
 Version:   6.0.300
 Commit:    8473146e7d

Runtime Environment:
 OS Name:     debian
 OS Version:  11
 OS Platform: Linux
 RID:         debian.11-arm64
 Base Path:   /home/xxxxxxxx/.dotnet/sdk/6.0.300/

Host (useful for support):
  Version: 6.0.5
  Commit:  70ae3df4a6

.NET SDKs installed:
  6.0.300 [/home/xxxxx/.dotnet/sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.App 6.0.5 [/home/xxxxx/.dotnet/shared/Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 6.0.5 [/home/xxxxx/.dotnet/shared/Microsoft.NETCore.App]

Do you know what is causing the issue? I tried to pin Cake addin to other versions but the issue remains.

Thanks for your help in advance.

DTMF detector is not working correctly with audio files that have a sample a rate of 48 KHz.

Expected Behavior

• Detector should work with 48 KHz audio.

Current Behavior

• When 48 KHz audio is fed to the detector it will miss actual DTMF tones and find false positives.

Possible Cause

• NAudio's WdlResamplingSampleProvider seems to be unable to suppress aliasing effects when downsampling from 48 KHz to 8 KHz

Steps to Reproduce

1. Run integration test AudioFileTests.ShouldDownsample48KHzCorrectly()

Possible Solution

• Try another of NAudio's resamplers
• Low-pass filter the audio data with cut-off at 8 KHz before downsampling

Is there a way to detect other wave frequencies like the Busy Signal (425 Hz).

Exception thrown: 'System.Threading.ThreadAbortException' in mscorlib.dll

I use VS2017, it's not working after successfully built. Showing error on when I pressing "o" or "m".

Hi, any plans to implement an FSK CallerID decoder? Thanks in advance. Best, Angelo

Hello, I use the dll some time ago. I implemented a timer in my code to identify the conversation. When this timer reaches 15 seconds of silence, I close the recording of the conversation.
But often the voice of who is on the other side of the line is very low, which ends up in the middle of the conversation breaking the recording.
In short, is there a way to identify if the phone is off the hook, via audio, or some other dll?
Thank you.

Hello everyone, I have been using the class to identify flames but I would like to increment my software with volumes and vu meter. Anyone have any practical examples in C # or VB.NET so I can test?

thank you.

Hi, @bert2

I'm working on a requirement where I'm transcoding some live audio stream from M1-L2/AAC to PCM .wav, on the fly.

Then, I need to feed NAudio with that live .wav audio stream, because it doesn't come from any audio device (mic/speaker) but from the network.

I'm wondering if it is possible to use a named pipe (fifo) as input ?

I'm aware this may have its own challenge since ultimately this named pipe is a kinda file, so NAudio may not understand what's going on, therefore my question.

If the above is not possible, is there any other alternatives?

When a DTMF tone is repeatedly played in short intervals, the DTMF detector will sometimes fail to tell them apart and report them as a single DTMF tone occurence instead.

Repro Steps

• Run integration test AudioFileTests.ShouldDetectVeryShortDtmfTonesCorrectly()

Repro Steps (Alternative)

• Execute DtmfDetector
• Press O to start capturing the current audio output
• Play https://en.wikipedia.org/wiki/File:DTMF_dialing.ogg and compare detected tones with the ones specified

Note

This could be an issue with the test data. The tones might be played faster than the typical Mark/Space of 40/40, which the detector assumes as minimum.

To support detect DTMF from all NAudio supported file types, change "WaveFileReaderExtensions.cs" like this:

namespace DtmfDetection.NAudio
{
    using System.Collections.Generic;

    using global::NAudio.Wave;

    public static class WaveFileReaderExtensions
    {
        public static IEnumerable<DtmfOccurence> DtmfTones(this WaveStream waveFile)
        {
            var dtmfAudio = new DtmfAudio(new StaticSampleSource(waveFile));

            while (dtmfAudio.WaitForDtmfTone() != DtmfTone.None)
            {
                var start = waveFile.CurrentTime;
                dtmfAudio.WaitForEndOfLastDtmfTone();
                var duration = waveFile.CurrentTime - start;

                yield return new DtmfOccurence(dtmfAudio.LastDtmfTone, start, duration);
            }
        }


    }
}

Thanks.

I implemented the dll in my project. but only it consumes 20% of my processor.
Is there any way to improve this?
Thank you.

I'm using "pure" PCM 16 bit 8000Hz 100ms WAV files as a source.

If I transmit a "long" sequence of DTMF codes
e.g.
1234567890#*
The last digits are detected correctly (with durations of around 6 to 8 milliseconds)
But I usually get incorrect and/or extra digits at the start (with durations of 4 to 5 milliseconds)

For the sequence above for instance I just got
One key 0.0050005 (channel 0)
One key 0.0050005 (channel 0)
Two key 0.0040004 (channel 0)
One key 0.0050005 (channel 0)
Two key 0.0060006 (channel 0)
Three key 0.0070007 (channel 0)
Four key 0.0070007 (channel 0)
Five key 0.0070007 (channel 0)
Six key 0.0070007 (channel 0)
Seven key 0.0070007 (channel 0)
Eight key 0.0070007 (channel 0)
Nine key 0.0080008 (channel 0)
Zero key 0.0080008 (channel 0)
Star key 0.0080008 (channel 0)
Hash key 0.0080008 (channel 0)

Reversing the order (#0987654321), I first got a correct set, then got
987654321

Now admittedly, this is going over UDP out to a SIP server and back again, so I guess it's possible that I'm getting packet loss or out of order arrival, but is there any way to tell that? Or to adjust the minimum detection interval?