| 摘要 |
<p>The invention comprises amongst other of microphone fixed to the protuberance on the enclosure via fixing screw, protuberance for the mic, auxiliary input, auxiliary output, main electronic circuit mounted on a base plate, digital audio processor circuit, microprocessor circuit, power supply circuit, amplifier, power supply cable, power source, enclosure fixed to the base plate using the mounting holes, membrane key pad mounted on enclosure comprising of +/- keys, mic keys, cable connecting goose neck mic to the electronic circuit, auxiliary input cable, right hand side speaker cable, left hand side speaker cable, base plate, mounting holes, mounting screw, such that when the driver of the vehicle wants to communicate to the passengers, mic button is pressed by him, leading to capturing of the verbatim audio from the driver by the microphone, causing amplification of the signal by digital audio processor circuit and toggling of the digital audio processor circuit between microphone and auxiliary input so that amplified audio signal is processed by the microprocessor circuit and fed to the audio speaker via cables and when the driver doesn't want to talk to the passenger the mic button is decompressed causing the output of the public address system toggle to the auxiliary output.</p> |
