Sound wave detection device and artificial intelligent electronic device having the same

An electronic device in which artificial intelligence is installed, the electronic device comprising:

• a sound wave detection unit for detecting a peripheral object with a sound wave,
• wherein the sound wave detection unit comprises:
• a signal generation module for generating a plurality of sound wave signals having different frequencies;
• a transmission module for transmitting the plurality of sound wave signals;
• a reception module for receiving an echoed sound wave signal among the sound wave signals;
• and
• a control module for emitting a first sound wave signal of the plurality of sound wave signals and transmitting a second sound wave signal having a frequency different from that of the first sound wave signal through the transmitter in a search period of the first sound wave signal,
• wherein the search period is a value obtained by dividing a value obtained by doubling a maximum detection distance by a sound speed.