Speaker polarity determination device

A speaker polarity determination device comprising:

• output terminals to which a speaker is connected;
• a test sound outputting unit which supplies a test signal to the output terminals and outputs test sound to an acoustic space via the speaker;
• a microphone which is arranged in the acoustic space and which collects the test sound to generate a microphone signal;
• a signal generating unit which generates a reference signal corresponding to the test signal;
• a speaker determining unit which determines whether the speaker is a full-range speaker or a mid/high-range speaker based on the microphone signal;
• a polarity determining unit which compares predetermined frequency range components of the microphone signal and the reference signal to determine a polarity of the speaker connected to the output terminals;
• and
• a reliability determining unit which determines a reliability of a determination result by the polarity determining unit based on the microphone signal and the reference signal,
• wherein, in a case where the speaker determining unit determines that the speaker is the full-range speaker, the polarity determining unit compares low-range components of the microphone signal and the reference signal to determine the polarity of the speaker and the reliability determining unit determines the reliability of the determination result, and the polarity determining unit outputs the determination result only when the reliability determining unit determines that the reliability of the determination result is high.