Audio Adapter Control Circuit for Pop Noise Suppression
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Solution Overview
Problem
Conventional USB to audio jack adapters often produce disturbing pop sounds when buttons are pressed, causing noise in recorded audio due to inevitable pressing sounds and friction.
Innovation Solution
A control circuit and method for audio adapters that includes a button detection circuit, FIFO data buffer, mute circuit, and USB endpoint control circuit to prevent recorded data from being transmitted when the button is pressed, using a multiplexer to selectively output data and avoid noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a physical button is used to control the audio adapter, then the ease of operation is improved, but harmful noises (pressing sounds, click sounds, friction sounds) are generated during button pressing
Solution Approach 1:
The patent extracts the harmful button-pressing sounds from the recorded audio by detecting button press events and selectively muting the audio stream during these events. The button detection circuit identifies when the button is pressed, and the mute circuit then prevents the corresponding audio data from being transmitted, effectively removing the harmful noises while preserving the rest of the audio recording.
Solution Approach 2:
The patent introduces a mute circuit as an intermediary component between the audio buffer and the USB endpoint buffer. This mute circuit acts as a mediator that can selectively block or allow audio data transmission based on button press detection, thereby preventing harmful sounds from reaching the output while maintaining normal audio operation during non-press periods.
2Object-generated harmful factors
If the button press detection is implemented, then the pop sounds are prevented from being recorded, but the device complexity increases due to additional control circuits
Solution Approach 1:
The patent implements multi-functionality by using the existing USB endpoint control circuit to also handle button press detection and audio muting functions. Rather than adding completely separate dedicated circuits, the endpoint control circuit is made to serve multiple purposes: normal audio data transmission control plus button event detection and corresponding audio stream muting, thereby reducing the overall complexity increase.
Solution Approach 2:
The patent merges the button detection function with the existing audio transmission control functions in the USB endpoint control circuit. The button detection circuit works in conjunction with the endpoint control circuit, combining multiple control functions into a unified approach that minimizes additional hardware complexity while achieving the goal of preventing pop sounds.
Data Source
AI summary
A circuit and a method for controlling an audio adapter are provided. The audio adapter includes a button and a microphone, and the microphone is adapted for generating a recorded data. The control circuit includes a button detection circuit, a first-in, first-out (FIFO) data buffer, a USB endpoint buffer, a mute circuit and a USB endpoint control circuit. The button detection circuit is used for detecting whether the button is triggered. The FIFO data buffer is used for storing the recorded data. The USB endpoint buffer is used for storing the recorded data. The mute circuit is used for controlling whether the recorded data is transmitted to the USB endpoint buffer according to whether the button is triggered. The USB endpoint control circuit is used for controlling whether the audio adapter outputs the recorded data according to whether the button is triggered.