Imaging apparatus, signal processing apparatus, and program

An imaging apparatus comprising:

• a microphone that converts a sound signal into an electrical signal;
• a detector that detects at least one of a sensor signal output from an operation sensor detecting an operation of an imaging unit that takes an optical image obtained by an optical unit and a control signal output from an operation unit that controls the operation of the imaging unit;
• a determination unit that determines a state of operation of the imaging unit based on at least one of the sensor signal and the control signal;
• a memory unit that stores a first electrical signal output from the microphone as a noise signal when a signal ratio of the first electrical signal and a second electrical signal is equal to or greater than a predetermined threshold value, the first electrical signal being a signal output from the microphone when the determination unit determines that the imaging unit is in operation, the second electrical signal being a signal output from the microphone when the determination unit determines that the imaging unit is not in operation;
• and
• a noise reduction unit that reduces a noise of the electrical signal output from the microphone using the noise signal stored in the memory unit.

A signal processing apparatus comprising:

• a signal input unit that inputs at least one of a sensor signal output from a sensor that detects an operation of an imaging unit taking an image obtained by an optical unit of an imaging apparatus and a control signal output from a control unit that controls the operation of the imaging unit, and inputs a sound signal output from the imaging apparatus;
• a determination unit that determines a state of operation of the imaging unit using at least one of the sensor signal and the control signal;
• a memory unit that stores a first sound signal output from the microphone as a noise signal when a signal ratio of the first sound signal and a second sound signal is equal to or greater than a predetermined threshold value, the first sound signal being output from the microphone while the determination unit determines that the imaging unit is in operation, the second sound signal being output from the microphone while the determination unit determines that the imaging unit is not being operated;
• a noise reduction unit that reduces a noise of the sound signal input into the signal input unit using the noise signal stored in the memory unit.

A computer-readable recording medium recording a program which causes a computer to execute instructions for processing signals, the program comprising:

• converting a sound signal into an electrical signal by use of a microphone;
• detecting at least one of a sensor signal output from an operation sensor detecting an operation of an imaging unit that takes an optical image obtained by an optical unit and a control signal output from an operation unit that controls the operation of the imaging unit by use of a detector;
• determining a state of operation of the imaging unit based on at least one of the sensor signal and the control signal by use of a determination unit;
• storing a first electrical signal output from the microphone as a noise signal when a signal ratio of the first electrical signal and a second electrical signal is equal to or greater than a predetermined threshold value by use of a memory unit, the first electrical signal being a signal output from the microphone when the determination unit determines that the imaging unit is in operation, the second electrical signal being a signal output from the microphone when the determination unit determines that the imaging unit is not in operation;
• and
• reducing a noise of the electrical signal by use of a noise reduction unit, the electrical signal being output from the microphone using the noise signal stored in the memory unit.