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Master control terminal, device terminal and method and system for transmitting multichannel audio data

A technology of audio data and main control terminal, which is applied in the directions of speaker distribution signal, electrical components, signal processing, etc., which can solve the problems of high hardware cost and high difficulty of I2S interface design.

Active Publication Date: 2017-06-30
ALLWINNER TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a master control terminal, a device terminal, a method and a system for transmitting multi-channel audio data, and to realize a multi-channel audio bus transmission protocol for multi-channel data transmission in view of the above-mentioned defects of the prior art , to overcome the defects of high design difficulty and high hardware cost of I2S interface in multi-channel data transmission applications

Method used

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  • Master control terminal, device terminal and method and system for transmitting multichannel audio data
  • Master control terminal, device terminal and method and system for transmitting multichannel audio data
  • Master control terminal, device terminal and method and system for transmitting multichannel audio data

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Embodiment 1

[0100] Figure 4 Shown is a functional block diagram of the master control end of an embodiment of the present invention, in this embodiment, the master control end 30 and the device end are connected through the I2S bus, the device end performs data sampling, and the device end is provided with a plurality of microphones, each Each microphone corresponds to one channel. The master control terminal 30 includes a clock adjustment module 301 , a clock output module 303 and a data receiving module 305 .

[0101] The clock adjustment module 301 changes the frame clock frequency and the bit clock frequency according to the number of audio channels on the device side. In this embodiment, the changed frame clock and bit clock satisfy the following formula: bclk=fs×N×Nbit×n, where lrck is the frame clock frequency, bclk is the bit clock frequency, fs is the sampling frequency, Nbit is the number of sampling bits, n is a positive integer, when the number of channels is even, N is eq...

Embodiment 2

[0108] Figure 5 Shows a functional block diagram of the device end in one embodiment of the present invention. In this embodiment, the device end 40 and the master control end are connected through the I2S bus, and the device end performs data sampling. The device end is provided with a plurality of microphones, each A microphone corresponds to a channel. The device end 40 includes a clock receiving module 401 and a data transmission module 403 .

[0109] The clock receiving module 401 is used to receive the changed frame clock and bit clock outputted by the master after changing the frequency of the frame clock and the frequency of the bit clock according to the number of channels of the device 40 . In this embodiment, the changed frame clock and bit clock satisfy the following formula: bclk=fs×N×Nbit×n, where lrck is the frame clock frequency, bclk is the bit clock frequency, fs is the sampling frequency, Nbit is the number of sampling bits, n is a positive integer, when...

Embodiment 3

[0115] Figure 7 Shows a flowchart of a method for transmitting multi-channel audio data at the master terminal according to an embodiment of the present invention, the method consists of Figure 4 The main control terminal 30 of an embodiment shown in the present embodiment, in this embodiment, the main control terminal 30 and the device end are connected through the I2S bus, the device end performs data sampling, and the device end is provided with a plurality of microphones, each microphone Corresponds to a channel. The master control terminal 30 includes a clock adjustment module 301 , a clock output module 303 and a data receiving module 305 .

[0116] In step S301, the master control terminal 30 changes the frame clock frequency and the bit clock frequency. The master control terminal 30 changes the frame clock frequency and the bit clock frequency according to the number of audio channels of the device terminal. In this embodiment, the changed frame clock and bit clo...

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Abstract

The invention relates to a system for transmitting multichannel audio data. The system for transmitting multichannel audio data comprises a master control terminal and a device terminal, and the device terminal is connected with the master control terminal through a bus; the master control terminal comprises: a clock adjustment module, a clock output module and a data receiving module; and the device terminal comprises a clock receiving module and a data transmission module. The invention further provides a master control terminal, a device terminal and a method and system for transmitting multichannel audio data. A multichannel audio bus transmission protocol for realizing multichannel data transmission can be realized without adding an interface conversion chip to the master control terminal, and the defects of high design difficulty and high hardware cost of an I2S interface in the multichannel data transmission application are overcome.

Description

technical field [0001] The invention relates to the field of digital audio, in particular to a master control terminal, a device terminal, and a method and system for transmitting multi-channel audio data. Background technique [0002] In today's SOC system, the transmission of digital audio frequency is essential. Currently the most widely used digital audio transmission standard is I2S (I2S, also known as I 2 S, Inter-IC Sound, integrated circuit built-in audio bus) serial bus interface, which defines the data transmission format of digital audio by bit clock BCLK, frame clock LRCK, serial data input SDIN, and serial data output SDO. This interface implements the specification of stereo (left / right channel) transmission, and can transmit two-channel data. With the development of the times, the transmission rate of audio data is gradually increasing, and the number of data sources that need to be transmitted is gradually increasing. Common audio applications such as 7.1-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04R3/12
CPCH04R3/12H04R2430/00
Inventor 肖振华
Owner ALLWINNER TECH CO LTD
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