The invention relates to a hands-free call
system which comprises a singlechip
microcomputer control module, a power supply module, a hands-free switching module, a sound effect
processing module, a power amplification module, a volume detection module, a
signal processing module, a
loudspeaker adjustment module and a
Bluetooth module, wherein the power supply module, the hands-free switching module, the sound effect
processing module, the power amplification module, the volume detection module, the
signal processing module, the
loudspeaker adjustment module and the
Bluetooth module are all connected with the singlechip
microcomputer control module. The hands-free call
system has the beneficial effects that due to the cooperative action of the volume detection module, the
signal processing module and the
loudspeaker adjustment module, the hands-free call
system disclosed by the invention can automatically adjust the magnitude of an output volume according to the magnitude of
environmental noise, and is more energy-saving; by the additional arrangement of the
Bluetooth module, the hands-free call system can support
Bluetooth communication; and meanwhile, a WIFI module is convenient for
data transmission. During use, the hands-free call system can eliminate echo of an
audio signal.