Method for outputting two paths of independent sound sources based on Android system

Abstract

The invention discloses a method for outputting two paths of independent sound sources based on an Android system. The method comprises the following steps: S1, sending an original audio in a system to a Codec audio device of a main controller for decoding by using an Android system original audio stream type, outputting the decoded original audio to an audio amplifier through a line out interface, and finally outputting the decoded original audio through a loudspeaker of the intelligent rearview mirror; and S2, sending the original audio in the system to newly added virtual Codec audio equipment for decoding by expanding an audio strategy and using the expanded audio data of one Android audio stream type, and outputting the audio data to an FM transmitter through an I2S interface. The method has the advantages that the control logic of the sound output path of the native Android system is modified, the double channels of the horn and the FM emitter are supported on hardware, two independent sound source outputs are achieved, the two sound outputs are independent of each other, and the sound content is different. Receiving of other sound information such as navigation is not affected when music is experienced, the two sound sources are different, auditory lag cannot be caused, meanwhile, the volumes of the two sounds are independently controlled and can be freely set, and the volume of the other sound source cannot be affected during broadcasting.

Description

technical field [0001] The invention relates to the technical field of automobile rearview mirrors, in particular to a method for outputting two independent sound sources based on an Android system. Background technique [0002] With the rapid development of the automobile industry and the improvement of living standards, the number of automobiles continues to increase. In the automotive aftermarket, smart rearview mirrors are very popular. They are not only easy to install, but also have functions such as driving records and navigation. [0003] Most of the smart rearview mirrors currently on the market are based on the Android system. In terms of sound output, the Android native system outputs the same sound source in a unified manner. No matter how many audio output channels the system has, such as speakers, infrared headphones, FM transmitters, etc., all The channels output the same sound. When the speaker and the FM transmitter output sound at the same time, such as l...

AI Technical Summary

Problems solved by technology

When the speaker and the FM transmitter output sound at the same time, such as listening to music, due to the delay between the sound emitted by the FM transmitter and the FM received sound of the original car, and the distance between the speaker on the smart rearview mirror and the original car speaker to the human ear, There will be some time difference between the two channels of sound, and the sound transmitted through FM will lag behind, which is a poor experience

Another example is when the smart rearview mirror is playing music, if there is a navigation broadcast, in order for the driver to hear the navigation sound, the

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