| 摘要 |
PROBLEM TO BE SOLVED: To provide a speech unit capable of easily carrying out interaction with a plate shield inserted in a call device (speaker). SOLUTION: The call device is provided with a receiver including a vibration pickup type microphone; a filter for passing through a voice electrical signal with a frequency band from the vibration pickup type microphone; an amplifier for amplifying the voice signal; and a speaker for sounding out the voice, and with a transmitter including a microphone picking up the voice; an amplifier for amplifying an electrical signal from the microphone; a filter for passing through a voice electrical signal with a frequency band in the voice signal; and a pickup-type speaker for vibrating the plate shield by the voice electrical signal to sound the voice. COPYRIGHT: (C)2006,JPO&NCIPI |
