| 摘要 |
<p>An adapter (300) provides a connection between a radio accessory (400) and a radio (200). The radio has a computer controller (202), an audio output, and an on-board speaker (205). The radio accessory comprises a connector plug for connecting to the adapter and a speaker. The adapter includes a first coupler for coupling to the radio, and a second coupler for coupling to the radio accessory. The adapter also includes a mode controller that provides a control signal to the computer control of the radio, causing the radio circuit to provide the audio output to the external accessory. The control signal comprising first and second states. The control means comprises a transistor for establishing the first and second states. Switch means causes the transistor to change from the first state to the second state in response to connecting the accessory plug to the second coupler.</p> |
