Headset Mute Switch Circuit for Low-Noise Microphone Switching
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Solution Overview
Problem
Noise is generated when a switch for muting a microphone is switched while sound is input, which is a common issue in existing headset designs.
Innovation Solution
A headset with a delay circuit in the voltage generator that prolongs the transition time of the control voltage, using a field effect transistor and resistors to gradually change the electronic switch's state, reducing noise by ensuring a smooth transition between mute and non-mute states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a switch for muting a microphone is switched while sound is input, then the microphone can be quickly muted, but noise is generated during switching
Solution Approach 1:
The patent applies dynamics by transitioning the electronic switch from instantaneous switching to gradual switching. The control voltage is changed gradually over time rather than abruptly, which dynamically adjusts the switching process to prevent noise generation while maintaining effective muting functionality
Solution Approach 2:
The patent changes the parameter of control voltage transition time from instantaneous to extended duration. By controlling the voltage generator to change the control voltage gradually, the switching process parameters are modified to eliminate noise while preserving the muting function
2Loss of time
If the control voltage transitions quickly, then the switching response is fast, but impedance changes cause noise and magnetic coupling
Solution Approach 1:
The patent makes the voltage transition dynamic and gradual rather than instantaneous. The control voltage changes over an extended period, which dynamically controls the impedance change rate to prevent magnetic coupling and noise while maintaining acceptable switching response
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces noise generation during mute state transitions by minimizing impedance changes and preventing magnetic coupling, thus enhancing audio quality and reducing sound leakage.
Implementation Method 1
The voltage generator includes: a capacitor provided between a gate terminal of the electronic switch and a ground, a first resistor provided between the gate terminal and a drain terminal of the electronic switch, and a second resistor provided between the gate terminal and the operation switch
Data Source
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AI summary
A headset 100 includes: a microphone 11, a first transmission line 31 that transmits a first electrical signal generated by the microphone 11 to an external device 200; an operation switch 21 that receives an operation for switching between (i) a non-mute state in which the first electrical signal is transmitted to the external device 200 and (ii) a mute state in which the first electrical signal is not transmitted to the external device 200; an electronic switch 22 that switches between (i) a conductive state in which the first electrical signal is transmitted and (ii) a non-conductive state in which the first electrical signal is not transmitted, on the basis of a control voltage which changes according to the state of the operation switch 21; and a voltage generator 23 that generates the control voltage.