The use of data reduction codecs and sound processors in broadcast dosn't allow traditional quality measurement methods such as THD, signal to noise ratio. In order to find an efficient and cost effective quality evaluation method, Radio France's Value Department experimented a tool called Tocade Audio Monitor (from CCETT research center). This device indicates the sound quality of a signal without any reference. It was tested with a CD that gives an image of Radio France programs (music, speech, location reports...). This CD test was used as a reference. All kind of signal paths were simulated using actual sound processors and data rate reduction codecs encountered at Radio France.
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