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A2B car audio bus - car power amplifier test
1、Overview
Audio is the core function of the smart cockpit, covering applications such as car audio, speech recognition, e-Call, noise cancellation and echo cancellation. Incorporate more advanced and feature-rich infotainment functions to satisfy consumers' user experience. However, the traditional analog parallel audio signal transmission method is difficult to achieve a balance between increased functions and lightweight vehicles (reduced weight and cost of cables).
ADI (Analog Devices Inc.) launched the A2B (Automotive Audio Bus) car audio bus through the optimization of the audio bus, which can provide excellent audio quality than the traditional analog audio bus, and can also greatly save the weight and cost of car audio wiring harness ( about 75% reduction).
2、Application of A2B
The A2B bus is used to connect audio devices in the vehicle, such as MIC, power amplifier (AMP), multimedia host (Head Unit) and T-BOX, etc. Transmit audio data (I2S/TDM), control signal (I2C), clock and power over a long distance through a low-cost unshielded twisted-pair cable UTP. The digital interface eliminates the need for peripheral DAC/ADC conversion, providing a simpler, more convenient solution for audio designs while improving fuel efficiency.
3、Advantages of A2B
50Mbps Data Rates
up to 32 independent upstream and downstream
Single master device, multiple slave devices (up to 10) line topology
The connection between nodes can reach 15m, and the length of the bus can reach 40m
44.1KHz and 48KHz sample rate, and up to 32-bit audio
4、A2B audio bus transceiver tester
U 923 is an analysis solution based on the A2B test of the current emerging audio bus. The deterministic nature of A2B technology makes it suitable for use in long-distance audio scenarios. Combined with software tools, it can efficiently test various A2B components, such as speakers, audio amplifiers, microphone arrays, sensors and drivers.
5、Car amplifier test
The signal generated by the A2B bus module is sent to the car power amplifier, and the PM 6687 audio analyzer is used to collect the output signal of the car power amplifier module, and then the signal is analyzed by AudioExpert audio analysis software.