Audio apparatus

An output suppression method for suppressing output of an audio signal in response to insertion and pulling out of a multipolar plug having a plurality of plug terminals from a corresponding connector having a plurality of connector terminals including an input terminal of an audio collection section and an output terminal that outputs a noise canceling signal whose phase is opposite to an audio signal supplied from the input terminal, the output suppression method comprising:

• a detection step of detecting whether the multipolar plug is inserted or pulled out by detecting change of voltage of a voltage supply line connected to an audio signal line that connects the input terminal and the output terminal, the voltage supply line supplying a reference voltage to the audio collection section via the audio signal line;
• and
• a control step of suppressing output from a signal amplification section provided on the audio signal line when the detection step detects that the multipolar plug is pulled out while not suppressing the output when the detection step detects that the multipolar plug is inserted.

A storage medium storing a computer-readable program for suppressing output of an audio signal in response to insertion and pulling out of a multipolar plug having a plurality of plug terminals from a corresponding connector having a plurality of connector terminals including an input terminal of an audio collection section and an output terminal that outputs a noise canceling signal whose phase is opposite to an audio signal supplied from the input terminal, the program causing a computer to execute:

• a process of detecting whether the multipolar plug is inserted or pulled out by detecting a change of voltage of a voltage supply line connected to an audio signal line that connects the input terminal and the output terminal, the voltage supply line supplying a reference voltage to the audio collection section via the audio signal line;
• and
• a process of controlling a suppression section to suppress output from a signal amplification section provided on the audio signal line when the process detects that the multipolar plug is pulled out while allowing the suppression section not to suppress the output when the process detects that the multipolar plug is inserted.

A headphone connected to an electronic device including an electronic circuit that inverts a noise signal collected by an audio collection section and then outputs from an audio output section an inverted reduction signal to reduce noise, the headphone comprising

• an adjustment section provided between the electronic circuit of the electronic device and the audio output section, the adjustment section adjusting variation regarding the acoustic characteristic of the audio collection section and the audio output section while the electronic device adjusts variation regarding the electric characteristic of the electronic circuit.

An input switching method comprising:

• a detection control step of controlling a detection section to detect whether a multipolar plug is connected by observing a change of voltage of a signal input line connected to a connector terminal corresponding to a plug terminal connected to an input device, the connector terminal being one of the connector terminals provided on a connector that supports the multipolar plug;
• and
• an open switch control step of closing, in response to the detection result of the detection section, an open switch provided between an adjusting resistance provided on a voltage supply line to adjust a voltage supplied from the voltage supply line to the input device via the signal input line and a connection point of a resistance provided between the voltage supply line and the signal input line, the connection point being on the side of the voltage supply line.

A storage medium storing a computer-readable program for causing a computer to execute:

• a detection control step of controlling a detection section to detect whether a multipolar plug is connected by observing change of voltage of a signal input line connected to a connector terminal corresponding to a plug terminal connected to an input device, the connector terminal being one of the connector terminals provided on a connector that supports the multipolar plug;
• and
• an open switch control step of closing, in response to the detection result of the detection section, an open switch provided between an adjusting resistance provided on a voltage supply line to adjust a voltage supplied from the voltage supply line to the input device via the signal input line and a connection point of a resistance provided between the voltage supply line and the signal input line, the connection point being on the side of the voltage supply line.