equalizer application in software?
I don't suppose anyone's done an equalizer application in software, e.g. not a controller for a hardware equalizer as in an AWE? Presumably this would be something between the audio source and the audio device, or a library which could be used by applications desirous of such functionality.
(I assume no such application exists)
-D
Hello Derrick,
Quoted 7 lines · Derrick J Brashear
I don't suppose anyone's done an equalizer application in software, e.g. not a controller for a hardware equalizer as in an AWE? Presumably this would be something between the audio source and the audio device, or a library which could be used by applications desirous of such functionality.
(I assume no such application exists)
I think there might be some audio multiplexing libraries (that takes audio output of different apps and mixes them together into one stream to send to the audio hardware); GNOME/Enlightement at least has one, called esd or esound I think. Since audio multiplexing is a very good feature, so is an equalizer, therefore I think building the two together (or at least making connecting them together simple) is worth the effort.
They also have a wrapper library one can preload to provide this functionality to 'normal' apps.
Sincerely,
Andras Kadinger
[email protected]
Quoted 6 lines · Derrick J Brashear
I don't suppose anyone's done an equalizer application in software, e.g. not a controller for a hardware equalizer as in an AWE? Presumably this would be something between the audio source and the audio device, or a library which could be used by applications desirous of such functionality.
Quoted 6 lines
(I assume no such application exists)
-D
Hummm..... lemme think.
I know there is a program available somewhere to do a FFT (Fast Fourier Transform) on a live real-time audio input. Perhaps if you take the frequency spectrum from the FFT ( it looks like a really high definition equalizer spectrum...... cool to watch), increase or decrease the intensity of the frequency components according to your equalizer's band settings, then recombine the components (a sort of reverse FFT), then you get the original waveform, except it has been equalized.
What do we think??
Sounds like project..... Where is the prog. to do the FFT? On sunsite?
Feedback appreciated.
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Jason Woodford Faculty of Education
Home: 579-2079 Office: 749-7503 Memorial University of Newfoundland
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Quoted 6 lines · Kadinger Andras
I think there might be some audio multiplexing libraries (that takes audio output of different apps and mixes them together into one stream to send to the audio hardware); GNOME/Enlightement at least has one, called esd or esound I think. Since audio multiplexing is a very good feature, so is an equalizer, therefore I think building the two together (or at least making connecting them together simple) is worth the effort.
esound. 0.2.4 is the most current on ftp.enlightenment.org.
To be honest the architecture used by NAS and to a greater extent by AF are more appealing to me, namely, be as much like X11 as possible. However, I do agree that an "audio wrapper" API like esound,AF,NAS, or maybe even rplay (but probably not) would be a good and logical companion for such an application.
In order for it to really be useful to me, I need to finish the next stage of the Linux/Sparc audio midlevel, namely, non-fixed-size, non-fixed-number buffers.
-D
Quoted 11 lines · Derrick J Brashear
Quoted 6 lines · Kadinger Andras
I think there might be some audio multiplexing libraries (that takes audio output of different apps and mixes them together into one stream to send to the audio hardware); GNOME/Enlightement at least has one, called esd or esound I think. Since audio multiplexing is a very good feature, so is an equalizer, therefore I think building the two together (or at least making connecting them together simple) is worth the effort.
esound. 0.2.4 is the most current on ftp.enlightenment.org.
The most recent "stable" release is 0.2.6, cvs snapshots are available from e.themes.org, or other gnome cvs sites. With version 0.2.6, there is a capability to connect a "filter" socket to the sound server. A sample filter which simply copies data unchanged is included with the source, so you can see how to interface with it.
Basically, the server sends the mixed audio data to the filter. The filter process reads the information, processes it, and sends it back to the server. The server writes the filtered data to the audio device.
Any decent Digital Signal Processing textbook should have the necessary algorithms (and maybe even sample code) for implementing a bandpass filter. The gsl (?) library may be of use for fft and perhaps even basic filter functions.
Quoted 11 lines
To be honest the architecture used by NAS and to a greater extent by AF are more appealing to me, namely, be as much like X11 as possible. However, I do agree that an "audio wrapper" API like esound,AF,NAS, or maybe even rplay (but probably not) would be a good and logical companion for such an application.
In order for it to really be useful to me, I need to finish the next stage of the Linux/Sparc audio midlevel, namely, non-fixed-size, non-fixed-number buffers.
-D
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