Call for ATRAC SP (Type-R) test recordings


New member
Username: Soundexpert

Post Number: 1
Registered: May-10
SoundExpert starts new experiment which could be interesting for Ecoustics forumers. It concerns precise time warping of audio signals which eliminates wow-and-flutter and other time inconsistencies of audio signals.

We chose ATRAC SP (Type-R) as an experimental candidate for testing our time warping code and would like to ask people on this forum who have MD equipment with ATRAC SP (Type-R) capability to record digitally SE test file and then record it back to PCM format digitally as well. This is in short. In detail:

1. Download a single test file - (WAV, 44100, 16, stereo, duration 5:15, size 29.7 MB). It consists of three identical groups of nine SE test samples (with trailing samples). Three groups are necessary to verify the consistency of recoding. The test file can be played back on computer directly or by mounting virtual Audio CD. Also it can be burnt as real Audio CD and played back on CD/DVD player. CUE-sheet for burning/mounting applications is included.
2. Using S/PDIF, TosLink, AES, USB or other digital interface record the test file to MD (Type-R) as a single track.
3. Playback the recorded MD track through digital interface and record it back to computer or other recording equipment in PCM 44100. If you record in 32bit format, leave it as is to avoid additional processing.
4. Archive or losslessly compress resulting WAV/AIFF 44100 PCM file and upload it to some file hosting service.

The most consistent and representative recording will then be added to SE rating system as ATRAC SP (Type-R) device under test. Details of the experiment are in SE news article -

Thank you in advance,

New member
Username: Soundexpert

Post Number: 2
Registered: May-10
First two submitted recordings appeared on Analysis of submitted ATRAC SP (Type-R) recordings page - ings. One belongs to Lee Keywood who originally proposed this codec to SoundExpert and another one - to Numinos from MiniDisc Forum - Time warped versions and artifacts signals are available for both.

New member
Username: Soundexpert

Post Number: 3
Registered: May-10
Experiment successfully finished. ATRAC SP (Type-R) was added to SE rating system.
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