Multi-output sound source recognition method and vehicle-mounted multi-sound-source system based on method

A recognition method and multi-sound source technology, applied to frequency/direction characteristic devices, etc., can solve problems such as poor user experience and sound source errors, and achieve the effects of improving system utilization, avoiding errors, and improving user experience

Active Publication Date: 2017-05-24
HUIZHOU DESAY SV AUTOMOTIVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the display system switches from the after-installed main unit signal to the original car main unit signal output, it is impossible to judge whether the system will continue to play the after-installed main unit’s sound source after switching back to the original car main unit signal through the peripheral bus and other signals of the original car system. I

Method used

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  • Multi-output sound source recognition method and vehicle-mounted multi-sound-source system based on method
  • Multi-output sound source recognition method and vehicle-mounted multi-sound-source system based on method
  • Multi-output sound source recognition method and vehicle-mounted multi-sound-source system based on method

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0042] Example one:

[0043] Make a linear regression judgment on the difference between the first sound data and the second sound data, such as image 3 As shown, including the following steps:

[0044] S211. Obtain the difference between the first sound data and the second sound data frame by frame, and obtain a total of n Difference

[0045] S212. Set frame to abscissa x , Set the first i frame xi , The difference between the first sound data and the second sound data is the ordinate y , The first i The difference corresponding to the frame is yi , According to this n The set of data is fitted to a straight line, and according to the actual situation, it is simplified to a one-variable linear regression, which is a straight line equation y=kx+b.

[0046] S213. Calculate the slope of the one-variable linear regression equation , Is the average of the abscissa, It is the average value of the ordinate, and the slope is used as the comparison value.

[0047] If the first sound data ou...

Example Embodiment

[0049] Embodiment two:

[0050] The judgment is made by calculating the variance characteristic values ​​of the first sound data and the second sound data respectively, such as Figure 4 As shown, including the following steps:

[0051] S221. Responding to the first sound data in units of frames And second sound data Calculate the variance to obtain the variance of the first sound data , The variance of the second sound data

[0052] S222. Variance of the first sound data Variance with the second sound data Do subtraction

[0053] S223. Obtain the variance value, and use the variance value as the comparison value.

[0054] Normally, if the first sound data output by the original car host is the same as the second sound data output by the post-installation host, the two variances should be the same, that is, the comparison value is 0. A threshold range centered on 0 can be set within the error range. If the variance value is within the threshold range, continue to output the secon...

Example Embodiment

[0055] Embodiment three:

[0056] After normalizing the first sound data and the second sound data, the difference is made frame by frame, and the difference is judged according to the sum, such as Figure 5 As shown, including the following steps:

[0057] S231. Perform MIN-MAX normalization processing on the first sound data and the second sound data respectively: ,among them: X* Is the value after normalization; X Is the value before normalization; min Is the minimum value of this sampled data group; max It is the maximum value of this sampled data group.

[0058] S232. Obtain the normalized first sound data frame by frame And second sound data Difference of ,among them .

[0059] S233. Change the difference of each frame Add to get the difference sum , And add the difference As a comparison value.

[0060] Normally, if the first sound data output by the original car host is the same as the second sound data output by the post-installation host, the difference between them...

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Abstract

The invention discloses a multi-output sound source recognition method and a vehicle-mounted multi-sound-source system based on the method. The vehicle-mounted multi-sound-source system comprises an original vehicle host, a later installed host, a display module and a loudspeaker. The later installed host acquires sound data outputted by the original vehicle host to act as first sound data and also acquires the sound data outputted by itself to act as second sound data. The later installed host decomposes the first sound data and the second sound data into multiple frames. The decomposed first sound data and the second sound data are compared to acquire a contrast value representing the degree of similarity, and an output sound source is judged according to the contrast value. The output sound source of the multi-sound-source system can be efficiently recognized so as to avoid mistakes and enhance the use experience of the user. Meanwhile, output of the sound data and the display data is respectively controlled by the original vehicle host and the later installed host so as to enhance the utilization rate of the system.

Description

technical field [0001] The invention relates to the field of vehicle-mounted multimedia sound output, in particular to a multi-output audio source identification method and a vehicle-mounted multi-audio source system based on the method. Background technique [0002] In the aftermarket, it is necessary to add an after-installed multimedia entertainment system to the original car-to-media entertainment system by switching the display and sound output to expand functions such as multimedia playback, night vision system, BVS and navigation. The car host usually shares a sound system and a display system, and the processor switches the audio output in different situations. When the display system switches from the after-installed main unit signal to the original car main unit signal output, it is impossible to judge whether the system will continue to play the after-installed main unit’s audio source after switching back to the original car main unit signal through the periphera...

Claims

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Application Information

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IPC IPC(8): H04R1/20
Inventor 赵岩巫金文朱剑
Owner HUIZHOU DESAY SV AUTOMOTIVE
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