Acoustic apparatus

An acoustic apparatus comprising:

• a measuring signal generator comprising a pulse generator configured to generate a pulse, a control signal generator configured to generate a control signal, and an adder configured to add the measuring pulse and the control signal in order to generate a measuring signal;
• a transducer comprising a diaphragm of which characteristic vibration is controlled by the control signal and configured to convert the measuring signal to a measuring sound to be applied to a measurement object and to convert a measuring sound reflected from the measurement object to a response signal;
• a response signal analysis module configured to analyze the response signal in order to output a physical quantity representing an acoustic characteristic of the measurement object;
• a controller configured to set one of a first state in which the transducer converts an electric signal to a sound and a second state in which the transducer converts a sound to an electric signal;
• and
• a switch configured to connect the measuring signal generator to the transducer in the first state and to connect the response signal analysis module to the transducer in the second state.

An acoustic apparatus comprising:

• a measuring signal generator configured to generate a measuring pulse to be converted to a sound by a transducer in a free sound field;
• a signal analysis module configured to analyze a characteristic vibration of the transducer in order to output a physical quality representing the characteristic vibration of the transducer;
• a controller configured to set one of a first state in which the transducer converts an electric signal to a sound and a second state in which the transducer converts a sound to an electric signal;
• and
• a switch configured to connect the measuring signal generator to the transducer in the first state and to connect the signal analysis module to the transducer in the second state.