"Nick Gorham" wrote in message

Don Pearce wrote:


But which effect is being heard in the blind test? I
note he didn't claim double blind.

What does ITU-R BS.1116-1 specify?

Double blind.

"To conduct subjective assessments in the case of systems generating small
impairments, it is necessary to select an appropriate method. The
"double-blind triple-stimulus with hidden reference" method has been found
to be especially sensitive, stable and to permit accurate detection of small
impairments. Therefore, it should be used for this kind of test."