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What Is Ringing Audio


Audio Basis - educational articles

Ringing audio is output response of audio device or DSP algorithm of software (firmware) to input impulse signal. This measurement intended for testing of audio gears to quality of playback of signal with sharp attack (piano, guitar, drums, etc.).

For sample rate converter  AuI ConverteR 48x44 we see graph "Comparing of SRC ringing":

Comparing of SRC ringing of sample rate converters

Graph 1 (click to enlarge)

Input test signal (1 sample with maximal amplitude) we can see here:

Input impulse for testing of ringing

Graph 2

Ideal output signal must same to input signal (Graph 2).

It is possible when audio device or algorithm have flat amplitude-frequency response from 0 to Infinity Hz.

But many algorihms (as example: sample rate conversion) use some filters.

For qualitative rejection of conversion artefacts and minimal loss of width of pass band filter must have more sharpen transition from pass band to reject band.

But filter with more sharpen transition have more amplitude (energy) of oscillations out of time (1 sample only) input impulse. The oscilations is ringing.


Resume: We must use optimal filter for decreasing of ringing (maximal save pass band and maximal sharpness of transition from pass to reject bands).


Last News

Where is the Limit of Audio Quality?

I read many endless discussions about audio equipment: cables, lossless vs. lossy, compression algorithms, jitter, ultrasound, playback files from different places of hard disk, power conditioners, etc.

I suppose, reason of the discussions is small perceived sound difference, that is not obvious for everybody, or no difference.

It is the end of high-end?

Below I want to discuss: can we get sound improvement, obvious for almost everyone, in future audio equipment?

New AuI ConverteR 48x44 v.6.4.7. ISO's Album Catalog Number

Released new studio audio converter AuI ConverteR 48x44 v. 6.4.7 CD ripper, ISO, DFF, DSF, WAV, FLAC, AIFF, ALAC. Album catalog number is extracted from ISO and stored into metadata of converted files.

How to Convert with Downmix 5.1 to stereo


Music stuff conversion with downmix 5.1 to stereo used to playback multichannel audio files at stereo systems.

At portable audio players and mobile phones stereo headphones are used to music listening. Conversion 5.1 records to stereo allow to reduce music file size to place at limited space of disk drive of portable audio player or other device.


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