| 摘要 |
PURPOSE:To decrease the number of lines between units by connecting a controller receiving the microphone signal of each unit with a low input impedance and mixing the signal to a line. CONSTITUTION:Units installed at every conference participant are provided respectively with microphones 2-1-2-N, monitor speakers 3-1-3-N and uttering switches 4-1-4-N, and they are connected by a line 5 by means of transmission wire branch connection. The line 5 is actually two jumpers and even when the number of units is increased, it can be coped with by having only to prolong the two jumpers 5. The controller 6 mixes the microphone signal from each unit and is used for power supply to each unit in common and an impedance element 7 is connected in parallel with a sound signal system and power is supplied to each unit from the power supply device 8 via a power line 9. Thus, the connection cable between the units is standardized to attain the connection of the units of the scale in response to the number of participants optionally. |
