| 摘要 |
<p>The plant consists of a telephone set, a base unit, a loudspeaker and a microphone. The microphone (7) and the loudspeaker/loudspeakers (8) are separated from the base unit (4) and connected to it by means of separate wires (9,10). The base unit (4) consists of three main parts. An amplifier for the loudspeaker/loudspeakers, an amplifier and voltage feed for the microphone, and a balancing circuit comprising two transformers in which all input signals of the plant are connected and outbalanced. The plant provides a good two-way directed speech communication in small and medium size conference rooms via the telephone set without an annoying speech alternation as a limiting factor.</p> |
