Modifying playing speed, length and sample rate of a soundfile

DART XP Pro offers you five tools for soundfile sampling rate and/or length modifications.

The Change speed option allows you to change the speed with which the audio file is played back.

The Trim length option can be used to modify the length of the file (contract it or extend) keeping the original sampling rate unchanged.

The Adjust RPM rate command can be used to correct the RPM rate if an old recording is played back with a nonstandard speed or using a nonstandard equipment (e.g. when a 78 RPM record is played back using a 33 RPM turntable).

The Resample function performs the sample rate conversion between both standard and nonstandard sampling rates.

Finally, the CD-format option can be used to convert any soundfile to a CD format (44kHz, stereo).

The overview strips placed at the top of all dialogs allow you to check the results on a selected fragment of the source soundfile. The local processing area is marked with a blue strip centered around the cursor - you can change its position (by clicking on the overview strip) and size (by adjusting the local processing time). When performing the sample rate conversion or modifying the length of the recording you can slightly speed up computations by picking up the lower conversion quality ('good' instead of 'very good').

NOTICE

You should be aware that some of the audio cards available on the market "cheat" when playing back files at nonstandard speeds, e.g. they pick the closest available speed if the declared one cannot be handled. In cases like that some speed and/or sampling rate modifications may result in 'phantom' sound distortions.

Resampling a soundfile

Changing playback speed

Adjusting RPM rate

Trimming length of a soundfile

CD format