RE: Testing SBC filtering functions

Christian Hoene
2008-12-29T10:55:30Z

Hello Marcel,

> I leave the patches to the guys that actually know what they are doing.
>
> So I like the test script, but I would really prefer if we can use
> sbctester.c program to verify the results. What do you think?

The sbctester.c works fine for the decoder and is used in the testing
script. The testing of the encoder might also work with test procedure
implemented in sbctester.c. However, the official Bluetooth testing spec
requires that
"9.2.2.1 SBC Encoder ... [E2] The subjective quality (measured by
standardized way or by objective testing
methods, see [6]and [7]) shall be equivalent to that of reference encoder."
with " [6] Rec. ITU-R BS.1116-1, "METHODS FOR THE SUBJECTIVE ASSESSMENT OF
SMALL IMPAIRMENTS IN AUDIO SYSTEMS INCLUDING MULTICHANNEL SOUND SYSTEMS",
1994-1997
[7] Rec. ITU-R BS.1387-1, "METHOD FOR OBJECTIVE MEASUREMENTS OF PERCEIVED
AUDIO QUALITY", 2001".
Until the encoder works fine, we should use BS.1387-1 (PEAQ). If all errors
have been fixed, then sbctester.c might can be used instead of ITU-R
BS.1387-1. However, then, we might still need the reference implementations
or some pretranslated wav and sbc files.

Until the encoder is bug-fixed, it makes sense to work with this
intermediate solution.

With best regards
Christian