Infrared light voice communication

Design tasks:

Design and produce an infrared light communication device to realize infrared light voice communication. The infrared optical communication block diagram is as follows:

Specific requirements are as follows:

(1) The infrared optical communication device uses infrared light emitting tubes and infrared light receiving modules as transceiver devices to directionally transmit voice signals;

(2) The transmitted voice signal can be input by a microphone or Φ3.5mm audio jack line, or by a low-frequency signal source; the frequency range is 300~3400Hz;

(3) The sound received within a transmission distance of 1 meter should be played through the speaker without obvious distortion.

Design constraints:

(1) The communication channel of this device must use infrared light channel, and other communication devices are not allowed;

(2) The transmitting end must use a discrete infrared light-emitting tube as the transmitting device, and shall not use infrared light-emitting chips or modules that contain ready-made communication protocols inside.