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(15 Ratings)

QR Code

+/- 1.34€
+/- £1.21
+/- ¥182.95


500-1 000
Estimate :

1.6 MB


DSP Audio Filter

Available in :
The DSP Audio Filter is a tool that enables you to filter frequencies from an audio spectrum by using your cell phone’s microphone.
This app was originally programmed for Ham Radio (Amateur Radio) operators to remove unwanted background noise and improve SSB and CW signals (Morse Code) but it can be used in different other ways.

For Example:  

-Bird watchers can use it to filter out higher frequencies and eliminate street noise or other disturbing low frequencies.

-Musicians can filter out a spectrum of specific instruments.

The DSP Audio filter uses a freely adjustable lowpass and highpass filter which allows you to select specific filter frequencies and bandwidths.  A waterfall visually displays the incoming audio spectrum to better identify the wanted or unwanted frequencies. You must use a headphone to avoid feedback effects.
Ham Radio Operator’s:  Just place your phone’s microphone close to your radio’s speaker and listen to clear audio in your headphone.

How to use:
DSP Audio Filter uses a waterfall to display the incoming frequency spectrum. With 2 sliders the cut-off frequencies can be adjust. The areas which are covered by a grey blurry layer are cut out and they will not be passed through to the headphone. All other areas will pass the filter.
The DSP Audio Filter can be used with 4 different sampling rates (22050Hz, 16000Hz, 11025Hz and 8000Hz) which can be set in the settings menu. Unfortunately not all devices support those sampling rates. The DSP Audio Filter will check for the supported sampling rates and only allows the selection of the supported sampling rates.

For any question please visit our new forum at

This is the first version of the DSP Audio Filter.It has been tested on several Android devices and has performed very well. However, since we are not able to test the performance on all 150+ Android devices it might not work on some devices. If the DSP Audio Filter doesn’t work on your device you can uninstall it within 15 minutes for a full refund (this is the time frame given by Google and I am not able to change it). If the 15 minutes passes and you are not happy with the DSP Audio Filter, email me as soon as possible at Please include your name and the model of your phone in the email. I will then refund you the money. It is important that you include the model of your device. I will try to find the cause for the malfunction or include your phone model in a list of “not working” devices.

iPhone related for DSP Audio Filter

DSP Audio Filter was developed for Android by Wolphi LLC

Package name : com.wolphi.filter

System permissions : 4 Click here to show/hide list
  • android.permission.RECORD_AUDIO
  • android.permission.WRITE_EXTERNAL_STORAGE
  • android.permission.READ_PHONE_STATE
  • android.permission.READ_EXTERNAL_STORAGE

I am the developer of this Application !

Screenshot(s) available for DSP Audio Filter

Discussion(s) about DSP Audio Filter in our forum

Comments and Ratings for DSP Audio Filter

Filters :
by A Google User the 7/14/2013

Just the tool I needed This is the tool I wish I had when I was stuck on a ten hour flight with a whine in the audio system. Note: to apply this tool, having a background in frequency analysis helps.

by A Google User the 3/26/2013

Great app This is great app. During our induction motor testing I could filter bearing noise from electrical noise. Well. You have such a large scale. If you could zoom into couple khz instead of 20k, we could identify each sound on scale. But again, this is great app for my HTC vivid. Please improve this app.

by A Google User the 3/6/2013

Useless for me Does not work on Android Samsung Galaxy.

by A Google User the 2/1/2013

Meh I used a headphones/mic splitter adaptor and a cable to plug my yaesu ft-817nd directly up to the phone in an attempt to use this app for its intended purpose, I.e. ham radio, and at least on ssb, it does nothing to improve the signal to noise ratio. It does process the sound, and all functions of the program seem to work with my Samsung galaxy s 2 skyrocket, but it simply does not make faint signals any clearer or easier to understand. Admittedly, I have not used it for CW.

by A Google User the 12/14/2012

Not compatible. This app is NOT compatible with my Archos 43it. Locks up each time I start it.

by A Google User the 10/22/2012

Tinnitus I will experiment to see if the filter can have positive results with Tinnitus. Mine occurs 24/7 around 5800 Hz sometimes bearable otherwise unbearable!

by A Google User the 7/24/2012

Very useful I find this app very useful in listening to my beehives to find out about their health. Very nice functionality. The developer responds quickly and effectively if there are any questions.

by A Google User the 9/16/2011

Sory,i dont hear nobody from headset! ZTE V9 Android 2.1 skakai4@ gmail com

by A Google User the 8/19/2011

nice start LG Optimus 2X dual core phones are powerful but audio quality sucks. you have great potential to develop a good filter to control sensitive microphone

by A Google User the 8/1/2011

Not what I hoped, bust still useful All this is, is a software based variable Bandpass/Notch filter which is great for filtering out QRM on the edges of the signal you're trying to hear, but does nothing for QRN. If it does I haven't heard a noticeable difference. Still this can cut out a lot of the noise which makes it useful for older radios that lack any kind of filtering. Currently doesn't work correctly on my EVO Shift, but works great on my old G1. 4 stars if it starts working right on the Shift or adds QRN filtering. 5 for both.

DSP Audio Filter for Android was rated by Android Market Users on : 3.1/5


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