Hiroshi Irii

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An internationally coordinated series of subjective listening experiments was conducted on the 16 kbit/s, LD-CELP algorithm, before its adoption as a CCITI" Recommendation (G.728). In this paper we describe the measurement methods employed and report on re..,ults obtained of the performance of the algorithm, under realistic network conditions.(More)
This paper investigates a sensitivity measurement method for carbon transmitters and a calculation method for the loudness rating of a telephone system. The sensitivity varies depending on the artificial voice used for the measurement and the conditioning procedures. The most preferable methods for obtaining values which coincide with those in the(More)
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