Audio apparatus

An input switching method comprising:

• controlling circuitry configured to perform as 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
• closing, when the detection section when the detection section detects that the multipolar plug is connected based on the change of the voltage of the signal input line, 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, wherein
• the resistance and the adjusting resistance are commonly connected to the signal input line.

A non-transitory computer-readable storage medium storing a computer-readable program for causing a computer to execute instructions for performing a method comprising:

• controlling circuitry configured to perform as 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
• closing, when detection section when the detection section detects that the multipolar plug is connected based on the change of the voltage of the signal input line, 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, wherein
• the resistance and the adjusting resistance are commonly connected to the signal input line.