| 摘要 |
An electrical circuit for use in controlling the coupling between two separate channels including a first transistor for connection in a first channel, a second transistor for connection in a second channel, a first and a second electrode of each transistor being connected in a respective output signal current carrying path, first signal coupling means connected between the said two first electrodes and second signal coupling means connected between the said two second electrodes, one of the said signal coupling means being variable.
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