DSP Audio Filter

DSP Audio Filter


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 http://www.wolphi.com/forum/

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 [email protected] 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.

Recent changes:
filtered spectrum can now be adjusted with a fixed bandwidth by moving the shaded area across the waterfall
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$1.99
68
3.4
User ratings
26
Installs
1,000+
Concerns
0
File size
1658 kb
Screenshots
Screenshot of DSP Audio Filter Screenshot of DSP Audio Filter Screenshot of DSP Audio Filter
About DSP Audio Filter
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 http://www.wolphi.com/forum/

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 [email protected] 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.

Recent changes:
filtered spectrum can now be adjusted with a fixed bandwidth by moving the shaded area across the waterfall

User reviews of DSP Audio Filter
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Android Market Comments
A Google User
Oct 25, 2014
Any chance for a refund? This isn't the tool I was looking for.
A Google User
Aug 8, 2014
Does what it says A good app that allows you to filter sound from MIC and listen it with a minimal delay. Missing only customization of waterfall, the rest is very good.
A Google User
Mar 30, 2014
Works exactly as advertised Used it to try a cancel a buzzing noise on a specific frequency, works great.
A Google User
Jul 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.
A Google User
Mar 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.