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A detection circuit and detection method for audio interface

A detection circuit and audio interface technology, applied in the direction of measuring electricity, measuring electrical variables, measuring devices, etc., can solve the problems of audio interface circuit interference, inability to further detect audio cables, etc., and achieve the effect of avoiding interference signals

Active Publication Date: 2017-10-31
GUANGDONG OPPO MOBILE TELECOMM CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current audio interface circuit can only detect whether there is an audio cable inserted into the audio terminal, and cannot further detect whether the other end of the audio cable is suspended
However, the actual situation is that when one end of the audio cable is connected to the audio interface circuit and the other end is suspended, the audio cable will introduce noise into the audio interface circuit, which will bring various noise to the audio interface circuit or the system connected to the audio interface circuit. kind of interference

Method used

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  • A detection circuit and detection method for audio interface
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  • A detection circuit and detection method for audio interface

Examples

Experimental program
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Embodiment 1

[0028] figure 2 It is a block diagram of a detection circuit for an audio interface of the present invention. see figure 2 A detection circuit for an audio interface includes: an audio terminal, an audio cable insertion detection module, a bias voltage module, a resistor R1, a capacitor C1, a resistor R2 and an MCU, the detection pin of the audio terminal is connected to the audio cable insertion detection module The detection input terminal, the detection output terminal of the audio line insertion detection module is connected to the MCU, the left or right channel pin of the audio terminal is connected to one end of the resistor R1, and the other end of the resistor R1 is connected to the controlled end of the bias voltage module One end of the resistor R2 and one end of the capacitor C1 are connected, the other end of the resistor R2 is grounded, the other end of the capacitor C1 is connected to the MCU, and the control end of the bias voltage module is connected to the ...

Embodiment 2

[0036] image 3 It is a specific circuit diagram of a detection circuit for an audio interface of the present invention. see image 3 , a detection circuit for an audio interface comprising: an audio terminal, an audio cable insertion detection module, a bias voltage module, a resistor R1, a capacitor C1, a resistor R2 and an MCU;

[0037] The audio cable insertion detection module includes a resistor R7 and a power supply VCC, one end of the resistor R7 is connected to the power supply VCC, and the other end of the resistor R7 is used as a detection input terminal of the audio cable insertion detection module and a detection output terminal of the audio cable insertion detection module;

[0038]The bias module includes resistor R6, resistor R5, transistor Q1 and power supply VCC. One end of resistor R5 is connected to power supply VCC, the other end of resistor R5 is connected to the collector of transistor Q1, the base of transistor Q1 is connected to one end of resistor R6...

Embodiment 3

[0049] Figure 4 It is a flow chart of the detection method based on the audio interface circuit of the present invention.

[0050] see Figure 4 , a detection method based on an audio interface circuit, comprising:

[0051] S101. The audio cable insertion detection module detects whether an audio cable is inserted into the audio terminal, and if so, executes S102;

[0052] In step S101, the audio line insertion detection module detects whether an audio line is inserted into the audio terminal, specifically: if the audio line is inserted into the detection output end of the detection module, that is image 3 If the Line_Det port in is low level, the audio line insertion detection module judges that no audio line is inserted into the audio terminal; if the audio line is inserted into the detection output end of the detection module, that is image 3 If the Line_Det port is at a high level, the audio cable insertion detection module determines that an audio cable is inserted ...

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Abstract

The invention relates to the technical field of electronic circuits, in particular to a detection circuit and a detection method for an audio interface. The detection circuit of the present invention includes an audio terminal, an audio line insertion detection module, a bias voltage module, a resistor R1, a capacitor C1, a resistor R2, and an MCU; when the audio line insertion detection module detects that an audio line is inserted into the audio terminal , the MCU controls the bias voltage module to conduct, and the other end of the audio line is suspended and not suspended, the resistance between the bias voltage module and the ground is different, and it can be judged whether the other end of the audio line is suspended; The MCU makes further control according to the judgment result of whether the other end of the audio cable is suspended. When the other end of the audio cable is suspended, the MCU shields the signal transmitted by the audio cable to prevent the audio cable from introducing interference signals into the system.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to a detection circuit and a detection method for an audio interface. Background technique [0002] The audio terminal is often used as Line in input to connect to the audio interface circuit, and its structure diagram is as follows figure 1 shown. Many of the current audio interface circuits can detect whether there is an audio cable inserted into the audio terminal. The 6th pin and the 7th pin of the terminal are connected; when an audio cable is inserted into the audio terminal, the head of the audio cable inserted into the audio terminal bears against the 5th pin and the 7th pin of the audio terminal to respectively It is disconnected from the 4th and 6th pins of the audio terminal, and this change can be used to detect whether an audio cable is inserted into the audio terminal. [0003] However, the current audio interface circuit can only detect whether an audio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/02
Inventor 刘绍斌
Owner GUANGDONG OPPO MOBILE TELECOMM CORP LTD