Audio Gain Parameter Adjustment for Fade Effects
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Solution Overview
Problem
Existing methods for adding fade-in and fade-out effects to audio signals encoded with compression coding, such as MP3 and AAC, require high computing speed and large memory, making them unsuitable for devices like cellular phones.
Innovation Solution
An apparatus that adjusts the first gain parameter for fade-in and/or fade-out effects without fully decoding the audio data, using a deframer, gain parameter adjuster, and framer to generate output audio frames with adjusted gain parameters, which can be implemented with low computing speed and small memory.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the conventional method of decoding audio data, changing amplitude of PAM samples, and encoding again is used to achieve fade-in/fade-out effects, then the fade-in/fade-out effects can be added to audio signals, but it requires high computing speed and large memory size which are not available in cellular phones
Solution Approach 1:
The invention extracts only the essential gain parameter adjustment function from the complete audio decoding and re-encoding process. Instead of fully decoding audio data, changing amplitude of PAM samples, and encoding again, the patent directly adjusts the gain parameter of the audio frame to achieve fade-in/fade-out effects, thereby reducing computing speed and memory requirements while maintaining the desired audio effect capability
Solution Approach 2:
The invention applies partial action by adjusting only the gain parameter rather than processing the entire audio signal through decoding, amplitude modification, and re-encoding. This partial processing approach achieves the fade-in/fade-out effect without the excessive computational burden of complete signal processing
Data Source
AI summary
An apparatus that process framed audio data to add fade-in and/or fade-out effect with low computing speed and small memory. The apparatus includes a deframer for taking an original value of a first gain parameter from an input audio frame, a first gain parameter adjuster for adjusting the first gain parameter based on the original value for a preset duration, and a framer for generating an output audio frame, which has the adjusted value for the first gain parameter.