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True Gapless Conversion of Audio Files

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For audio conversion of some album kinds (operas, symphonies, live concerts, musicals, shows, etc.) need to provide seamless (gapless) transients between neighbor converted tracks.

True Gapless Conversion (TGC) - seamless album conversion - allow avoiding artifacts at borders of neighbor converted tracks.

What is True Gapless Conversion

 

General description

There are albums like operas, live concerts, etc., where no pauses between neighbor tracks. Also, non-zero levels at track borders of the albums may be there.

Some ISO (1-bit audio) has a level bias (DC-bias, direct current bias) throughout full an album: at begin and end of tracks DC-bias (non-zero level) is present. It can be listened as a click.

Level bias (DC-bias) thru full album

ISO DC bias (1-bit HD audio)

In conversion may be applied audio processing:

  1. Resampling (sample rate altering)
  2. Altering 1-bit audio stuff (DSF, DFF, ISO).

In conversion without the processing, there are no artifacts at output-track borders.

But, if each album track (file) is processed separately, non-zero level at input-file border generate artifact at output-file border. Because the processing is re-initialized for each track.

For seamless audio processing of the album, all its audio files may be processed as a continuous audio stream without re-initializing of processing for each track (file).

Audiophile Inventory's trueG seamless conversion algorithm allows seamlessly process neighbor tracks of album.

True gapless mode switched in AuI ConverteR's main window > Parameters tab (upper left):

turn ON (checked state) / OFF (unchecked state).

Management of True Gapless Conversion mode

True gapless conversion management

Here merged converted neighbor album tracks are shown

True gapless conversion spectrum

 

If True Gapless Conversion turn OFF, we see noise splash on border of merged resampled converted tracks. The splash at spectrum shows short level increasing, that is absent in source files.

The noise splash is an additional ringing artefact rising due to a rather significant non-zero level at begin or end of file. It happens when resampling filter gets sharp level transient.

If True Gapless Conversion is turned ON, we see seamless transient between resampled converted tracks. Like input source files.

In this case, resampling filter gets a continous input stream and have no additional ringing at the output.

AuI ConverteR 48x44 provide True Gapless Conversion for the following conditions are complied with:

  1. All input (source) tracks (files) must have the same sample rate and bit depth.
  2. Input tracks must be sorted in album order.

 

Warnings

  1. True gapless mode can't use multi-CPU capability. Because files (album tracks) should be processed sequentially. To convert the next audio file, converter state at end of previous track is need.
  2. Audio player (software or hardware), that playback processed files, should support gapless (seamless, without re-initialization on each file) playback. All files should be played back as a continuous stream.

 

What AuI ConverteR's editions support the True Gapless Conversion

AuI ConverteR FREE allow testing True Gapless Conversion with 2-second silence at the middle of converted files, including ISO 1-bit-audio files.

True Gapless Conversion ia supported in:

 

 


Read about sound quality

  1. How to Improve Sound Quality >
  2. What is optimization audio for DAC >

 

 


Read also

How Convert ISO to DSF, WAV, etc. without Clicks (Mac OS X and Windows) >

February 06, 2021 updated | since February 18, 2015

 

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