CN113365189B - Multi-channel seamless switching method - Google Patents

Abstract

The invention relates to a multi-channel seamless switching method, which comprises the following steps: an input data interface module and a signal output module are preset in a chip; setting digital logic in the input data interface module to switch input data, wherein the algorithm of the digital logic is a cross gradual change algorithm; the input data interface module receives input data, performs sound channel switching on the input data by adopting a cross gradual change algorithm, and the signal output module outputs the switched data; and multi-channel seamless switching is realized. The invention switches the input data in real time by arranging the digital logic in the chip, and does not need to arrange a general DSP logic in the chip, thereby reducing the consumption of chip resources and the design complexity, and further reducing the cost; and the digital logic realizes seamless switching by adopting a cross gradual change algorithm in the switching process, thereby avoiding the problem of interruption of output signals.

Description

Multi-channel seamless switching method

technical field

The present invention relates to the technical field of audio signals, in particular to a multi-channel seamless switching method.

Background technique

In the application of the intelligent power amplifier chip, it is necessary to realize the real-time switching of the input multi-channel data (the input signal may be 2-channel, 4-channel, and 8-channel data) during the playback process. For example, switching from the left channel output to the right channel output, or switching the right channel output to the left channel output.

Currently, this switching process can be implemented in the following ways:

Method 1: The platform switches data in real time through software algorithms. The limitation of this solution is: if the platform output is a stereo signal, and the actual project is a scene of 4 chips (corresponding to 4 speakers, 4 channel output), only two left speakers can be switched at the same time, but 4 speakers cannot be realized. Any one of the speakers switches the output in real time.

Mode 2: The data path is switched in real time through the built-in DSP (digital signal processing module) of the chip. The limitation of this solution is that an independent digital signal processing module needs to be built in the chip itself, and the built-in independent digital signal processing module will additionally increase the complexity of the chip design and the cost of the chip. Some chips can implement data switching at the data input interface, but due to design limitations, the output needs to be interrupted for a short time during the switching process.

Therefore, it is necessary to provide a multi-channel seamless switching method. By adopting a cross-fading algorithm in the input data interface module of the chip, the left and right channels can be seamlessly switched without the problem of output signal interruption.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a multi-channel seamless switching method. By adopting a cross-fading algorithm in the input data interface module of the chip, the left and right channels can be seamlessly switched without the problem of output signal interruption.

In order to solve the problems existing in the prior art, the present invention provides a multi-channel seamless switching method, comprising the following steps:

The input data interface module and the signal output module are preset inside the chip;

A digital logic is set in the input data interface module to switch the input data, and the algorithm of the digital logic is a cross-fading algorithm;

The input data interface module receives the input data, adopts the cross-fading algorithm to switch the channel of the input data, and the signal output module outputs the switched data;

Achieve seamless multi-channel switching.

Optionally, in the multi-channel seamless switching method, the cross-fading algorithm is as follows:

Set the crossfade coefficient Coef[i];

When channel switching starts, the data output for the left channel is:

Data_Left[i]=(Data_Right[i]*Coef[i]+Data_Left[i]*Coef[n-1-i])/n;

When channel switching starts, the data output for the right channel is:

Data_Right[i]=(Data_Left[i]*Coef[i]+Data_Right[i]*Coef[n-1-i])/n;

Where Data_Left is the left channel data value, Data_Right is the right channel data value, i is the coefficient subscript, and n is the total number of coefficients.

Optionally, in the multi-channel seamless switching method, the cross-fading coefficient Coef[i] is defined as a step size of 1.

Optionally, in the multi-channel seamless switching method, the gradient coefficient Coef is: 0, 1, 2, ..., n-1.

Optionally, in the multi-channel seamless switching method, a typical value of n is 256.

In the multi-channel seamless switching method provided by the present invention, by setting digital logic inside the chip to switch input data in real time, there is no need to build a general DSP logic in the chip, which reduces the consumption of chip resources and reduces the design complexity, Thus, the cost is reduced; and the digital logic realizes seamless switching by adopting a cross-fading algorithm in the switching process, thereby avoiding the problem of output signal interruption.

Description of drawings

1 is a flowchart of a multi-channel seamless switching method provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of channel seamless switching according to an embodiment of the present invention.

Detailed ways

The specific embodiments of the present invention will be described in more detail below with reference to the schematic diagrams. The advantages and features of the present invention will become more apparent from the following description. It should be noted that, the accompanying drawings are all in a very simplified form and in inaccurate scales, and are only used to facilitate and clearly assist the purpose of explaining the embodiments of the present invention.

If a method described herein includes a series of steps, the order of the steps presented herein is not necessarily the only order in which the steps can be performed, and some of the steps described may be omitted and/or some other steps not described herein can be added to this method.

At present, the channel switching process can be implemented in the following ways: way 1: the platform switches data in real time through software algorithms; way 2: real-time switching of data paths through the built-in DSP (digital signal processing module) of the chip. The first method has the problem that only two left speakers can be switched at the same time, but cannot realize the real-time switching output of any one of all the speakers; the second method has the problems of complicated design, high chip cost and easy signal interruption.

Therefore, it is necessary to provide a multi-channel seamless switching method. As shown in FIG. 1, FIG. 1 is a flowchart of a multi-channel seamless switching method provided by an embodiment of the present invention. The multi-channel seamless switching method includes: The following steps:

The input data interface module and the signal output module are preset inside the chip;

A digital logic is set in the input data interface module to switch the input data, and the algorithm of the digital logic is a cross-fading algorithm;

The input data interface module receives the input data, adopts the cross-fading algorithm to switch the channel of the input data, and the signal output module outputs the switched data;

Achieve seamless multi-channel switching.

Specifically, please refer to FIG. 2 , which is a schematic diagram of a seamless channel switching provided by an embodiment of the present invention, wherein the cross-fading algorithm is as follows:

Set the crossfade coefficient Coef[i];

When channel switching starts, the data output for the left channel is:

Data_Left[i]=(Data_Right[i]*Coef[i]+Data_Left[i]*Coef[n-1-i])/n;

When channel switching starts, the data output for the right channel is:

Data_Right[i]=(Data_Left[i]*Coef[i]+Data_Right[i]*Coef[n-1-i])/n;

Where Data_Left is the left channel data value, Data_Right is the right channel data value, i is the coefficient subscript, and n is the total number of coefficients.

Preferably, in an embodiment, the cross gradient coefficient Coef[i] is defined according to a step size of 1, and the gradient coefficient Coef is: 0, 1, 2, ..., n-1. For example, the typical value of n is 256, and the gradient coefficient Coef is: 0, 1, 2, ..., 255. Of course, any length can be defined to achieve seamless channel switching in practice.

To sum up, in the multi-channel seamless switching method provided by the present invention, by setting digital logic inside the chip to switch the input data in real time, there is no need to build a general DSP logic in the chip, which reduces the consumption of chip resources and reduces the design The complexity is reduced, and the cost is reduced; and the digital logic realizes seamless switching by using a cross-fading algorithm during the switching process, avoiding the problem of output signal interruption.

The above are only preferred embodiments of the present invention, and do not have any limiting effect on the present invention. Any person skilled in the art, within the scope of not departing from the technical solution of the present invention, makes any form of equivalent replacement or modification to the technical solution and technical content disclosed in the present invention, and does not depart from the technical solution of the present invention. content still falls within the protection scope of the present invention.

Claims (2)

1. a multi-channel seamless switching method, is characterized in that, comprises the following steps: The input data interface module and the signal output module are preset inside the chip; The digital logic is set in the input data interface module to switch the input data, and the algorithm of the digital logic is a cross-fading algorithm. The length is defined as 1, and the gradient coefficient Coef is: 0, 1, 2, ..., n-1; when the channel switching starts, the data output of the left channel is: Data_Left[i] = (Data_Right[i]*Coef [i] + Data_Left[i]*Coef[n-1-i]) / n; when the channel switching starts, the data output of the right channel is: Data_Right [i] = (Data_Left[i]*Coef[i ] +Data_Right[i]*Coef[n-1-i] ) / n; where Data_Left is the left channel data value, Data_Right is the right channel data value, i is the coefficient subscript, and n is the total number of coefficients; The input data interface module receives the input data, adopts the cross-fading algorithm to switch the channel of the input data, and the signal output module outputs the switched data; Achieve seamless multi-channel switching. 2 . The multi-channel seamless switching method according to claim 1 , wherein a typical value of n is 256. 3 .

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