A novel and cheap wireless digital audio broadcast system ----- Broadcasting System

Keywords: broadcasting system Be Author: Gan Mingxiao The core components of this system use modular design, as long as you pay attention to the peripheral circuit design and device location layout, it is quite convenient and simple. First, the principle of wireless digital audio transceiver module: As shown in the figure below, when the normal stereo frequency value L, R input, first process the analog to digital converter (ND), generate 44.1k / l6bit data stream, then send data stream to digital signal processing The process is performed in the device (DSP), and finally modulates the GFSK modulator of 2.4 GHz phase locked loop (PLL), and the radio frequency signal is sent from the antenna after amplification. The receiving module principle is shown in the following figure, the received signal is first enlarged by a low noise amplifier (LNA), and then enters the 2.4 GHz phase-locked loop (PLL) to demodulate, demodulated data into the data Digital Signal Processor (DSP) is processed, and the 44.1k / l6bit data stream output is processed, and the data is converted into an audio signal through the digital-to-analog converter (D / A). Second, Digital Wireless Broadcasting System Design and Debug: As shown in the figure, connect the transmitter to the DVD or the source of the computer, you can make high fidelity audio broadcasts on the numerous receivers. When the transmitter is designed in accordance with the middle map, the AW2402T module has a vertical layout, allowing the built-in antenna from being affected by the peripheral components. SWI, SW2, SW3 can be encoded, and three switching status combinations can set eight sets of frequencies. When the receiver is designed as shown below, the 3.3V battery can be replaced by a mobile phone battery, durable and easy to purchase W1 as a dual potentiometer, control the volume. Be careful when installing, do not install the module, after loading the peripheral components, to test the transmitter voltage regulator power supply, determine the voltage is 5V, then install the transmit module. The receiver also wants to detect if the power supply is correct, whether the power amplifier circuit is working properly, and then install the module. After all installation is complete, open the receiver power SW1, the receiver status indicator is flashing, then connect the transmitter source, power supply, power indicator case, at which time the status indicator of the receiver is flashing into normal shell, in the earplug Outlet music. If there are several transmitters working simultaneously, just press SW2 to switch channels.

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