# 8.4 Localizing multiple sounds

Problem

As a simplification, the number of sound sources that can be localized simultaneously is equal to or less than the number of microphones to be used. If the number of target sound sources to be localized is $N$ , this value should be set at $N$ . If $M$ noises are heard continuously from a specific direction, then this value should be set at $M+N$ .
Theoretically, the MUSIC method can localize sound sources whose number is equal to or less than the number of microphones. That is, when using eight microphones, the maximum number of sound source is eight. Experimentally, however, stable localization can be performed only for up to $3 \sim 4$ sound sources.