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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. It is still switched to the sound source of the original car main unit, which will lead to errors in the sound source during the switching process between the two main units, such as multimedia sound sources, but when the user returns from the original interface to the after-installation interface, the playback position will change, causing the user bad experience

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

Embodiment 1

[0043] Make a linear regression judgment on the difference between the first sound data and the second sound data, such as image 3 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 the frame as the abscissa x , set the No. i frame x i , the difference between the first sound data and the second sound data is the ordinate y , No. i The frame-to-frame difference is y i , according to this n A straight line is fitted to the set of data, and according to the actual situation, it is simplified to a one-variable linear regression, which is the straight line equation y=kx+b.

[0046] S213. Calculate the slope of the unary linear regression equation , is the mean value of the abscissa, is the average value of the ordinate, and the slope is used as a comparison value.

[0047] If the first sound data output by the origin...

Embodiment 2

[0050] Judgment is made by calculating the variance eigenvalues ​​of the first sound data and the second sound data respectively, such as Figure 4 shown, including the following steps:

[0051] S221. Align the first sound data in units of frames and second sound data Calculate the variance, get the variance of the first sound data , the variance of the second sound data

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

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

[0054] Usually, if the first sound data output by the original car main unit is the same as the second sound data output by the after-installed main unit, the two variances should be the same, that is, the comparison value is 0. A threshold range with 0 as the center can be set within the error range. If the variance difference value is within the threshold range, continue to output the sec...

Embodiment 3

[0056] After normalizing the first sound data and the second sound data, make a frame-by-frame difference, and judge according to the difference, such as Figure 5 shown, including the following steps:

[0057] S231. Perform MIN-MAX normalization processing on the first sound data and the second sound data respectively: ,in: X* is the value after normalization; X is the value before normalization; min is the minimum value of the sampling data set; max is the maximum value of this sampling data set.

[0058] S232. Acquire the normalized first sound data frame by frame and second sound data difference ,in .

[0059] S233. The difference of each frame Add to get the difference and , and taking this difference and as a comparison value.

[0060] Normally, if the first sound data output by the original car head unit is the same as the second sound data output by the after-installed head unit, the difference between them per frame should be 0, the difference...

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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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