| 摘要 |
A two-line interphone circuit commonly having a power line and communication line includes a polarity arranger for arranging the polarity of a transmission/reception signal, a power supply for supplying DC power to transmission lines, a DC blocking section for blocking the DC component of a vocal signal, a two-line converter for transmitting an input vocal signal in two lines and two-line-converting the vocal signal received through the two lines, and a filter for blocking high-frequency component from the vocal signal, thereby facilitating the installation of the apparatus.
|
