| 摘要 |
An adapter converts a monaural microphone unit for stereophonic operation. The adapter has an elongate cylindrical housing including an input jack which rigidly attaches to the microphone and receives the microphone signal and an output jack which makes stereophonic signals available to recording equipment. Two distinct signal transmission channels are present in the adapter for transmission of the microphone signal to the output jack. A gravity-responsive switch selects which of the two transmission channels is active depending on the orientation of the adapter housing relative to vertical. An interviewer maintains the adapter and microphone in a vertical orientation or inclined towards him to record his questions along one channel and tilts the adapter unit towards his subject to record the response on the other signal channel. Resistors couple the two transmission channels to ensure that the non-active signal channel is not silentbut at least carries the microphone signal in attenuated form. Delay circuits prevent sudden activation and deactivation of the transmission channels as by momentary tilting of the adapter and microphone. |
