DAC Audio Mute Timing for Power-On Pop Noise Suppression
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Solution Overview
Problem
Existing digital to analog converters in audio signal reproducing apparatuses generate pop noise when power is applied or turned off, leading to deteriorated sound quality.
Innovation Solution
An apparatus with a timing setting unit, a timing adjusting unit, and a mute control unit that includes first and second mute processing units to mute audio signals based on set and adjusted timing, effectively removing both positive and negative pop noise by using voltage control elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a digital to analog converter is used to enhance sound quality, then sound quality is improved, but pop noise is generated when power is applied or turned off
Solution Approach 1:
The patent applies preliminary action by introducing a mute signal generation circuit that activates before the audio signal during power-on and power-off transitions. This circuit generates a mute signal that suppresses the audio signal output in advance, preventing pop noise from occurring when the DAC is powered on or off, while maintaining high sound quality during normal operation.
2Object-generated harmful factors
If timing is set to remove pop noise, then pop noise is reduced, but timing precision must be accurately controlled
Solution Approach 1:
The patent employs feedback by using a timing adjustment circuit that receives feedback about the actual timing of the mute signal relative to the audio signal. This circuit adjusts the timing of the mute signal dynamically to ensure it aligns precisely with the audio signal transitions, achieving accurate pop noise suppression without requiring fixed manual timing calibration.
Solution Approach 2:
The patent applies parameter changes by introducing adjustable timing parameters in the timing adjustment circuit. This circuit allows the timing of the mute signal to be varied and optimized based on different operating conditions, enabling precise control over when the mute signal is applied to suppress pop noise without compromising audio quality.
Data Source
AI summary
The present invention proposes an audio signal muting apparatus setting and adjusting a time for removing pop noise and muting an audio signal based on the set and adjusted timing. Further, the present invention proposes a digital signal converting apparatus for muting an analog audio signal based on a timing for removing pop noise when converting a digital audio signal into an analog audio signal in connection with an audio signal reproducing apparatus.