Audio system and method and device for controlling thereof

1 . An audio system comprising:

a directional loudspeaker group comprising a plurality of directional loudspeakers, wherein the plurality of directional loudspeakers are provided at respective first preset positions,

wherein the plurality of directional loudspeakers, when operating, are oriented to a second preset position and radiate sound waves thereto, so as to form a three-dimensional regional sound field in a preset transmission area,

wherein the first preset positions and the second preset position are located in the preset transmission area,

wherein each of the plurality of directional loudspeakers is an ultrasonic loudspeaker, and

wherein an ultrasonic carrier signal is modulated by an audio signal to be output by the plurality of directional loudspeakers in a form of ultrasonic wave.

2 . The audio system of claim 1 , wherein the directional loudspeaker group comprises a plurality of directional loudspeaker groups, and each of the directional loudspeaker groups is separately provided in one preset transmission area.

3 . The audio system of claim 2 , further comprising:

a plurality of audio input interfaces, wherein a number of the audio input interfaces corresponds to a number of the directional loudspeaker groups, and each of the audio input interfaces is configured to receive the audio signal of one channel; and

a plurality of audio processors, wherein an input end of each of the audio processors is connected to one of the audio input interfaces, and a plurality of output ends of each of the audio processors are connected to a plurality of directional loudspeakers of corresponding directional loudspeaker groups in one-to-one correspondence,

wherein each of the audio processors is configured to convert an audio signal of one channel to audio signals of multiple channels and output the converted audio signals of multiple channels to respective directional loudspeakers.

4 . The audio system of claim 3 , further comprising:

a plurality of control switches, wherein one of the control switches is provided in series between input ends of every two audio processors,

wherein when the control switches are closed, two audio processors connected to each of the control switches process accessed audio signals, and then output the processed audio signals to respective directional loudspeakers, so as to realize simultaneous playing of audio signals in a plurality of the preset transmission areas.

5 . The audio system of claim 3 , wherein each of the audio processors is further configured to process the audio signal of one channel into the audio signals of multiple channels according to a vector position between a stored second preset position and each of the first preset positions, and outputs the processed audio signals of multiple channels to respective directional loudspeakers.

6 . The audio system of claim 3 , wherein each of the audio processors comprises:

an audio modulation circuit connected to one of the audio input interfaces, wherein the audio modulation circuit is configured to modulate the ultrasonic carrier signal by the audio signal and output modulated audio signals to respective ultrasonic transducers.

7 . The audio system of claim 1 , wherein the ultrasonic wave is demodulated in air to generate an audible sound.

8 . A method for controlling the audio system of claim 1 , wherein the method for controlling the audio system comprises:

obtaining an audio system control instruction; and

controlling a corresponding directional loudspeaker group in the plurality of directional loudspeaker groups to operate according to the obtained audio system control instruction, so as to play an audio signal in a corresponding preset transmission area.

9 . The method for controlling the audio system of claim 8 , further comprising:

obtaining a user target position in the corresponding preset audio transmission area; and

adjusting an angle of an outlet of directional loudspeakers in the corresponding directional loudspeaker group according to the user target position.

10 . A non-transitory computer-readable medium storing instructions that, when executed by a processor, cause a processor to perform steps of the method of claim 8 .