Audio Playback Speed Control via Frequency Band Segmentation
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Solution Overview
Problem
Current playback speed increase methods for spoken content in educational videos compromise quality, making it difficult for learners to maintain comprehension due to inconsistencies in speech speed and pause lengths, leading to a need for a system that enhances playback speed without degrading audio quality.
Innovation Solution
A method and system that analyze audio waves to identify and adjust pause lengths, calculating new playback speeds for silent sections, and reducing the duration of low-frequency repeating patterns and inter-syllable silences while retaining high-frequency sections, allowing for increased playback speed without affecting clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If playback speed is increased to save time, then productivity is improved, but speech quality and comprehension are degraded
Solution Approach 1:
The audio signal is divided into multiple frequency bands using a filter bank. Different playback speed adjustments are applied to different frequency segments, with high-frequency speech components preserved at original speed and low-frequency background components accelerated, thereby maintaining speech quality while achieving overall speedup
Solution Approach 2:
Different quality requirements are applied to different frequency regions. High-frequency components containing speech information maintain original playback speed for clarity, while low-frequency components can be accelerated more aggressively, creating local quality differentiation that resolves the contradiction between speed and quality
2Loss of time
If playback speed is increased beyond 1.6×-1.75×, then time savings increase, but clarity and comprehension quality are affected
Solution Approach 1:
The system dynamically changes playback speed parameters based on frequency content. By adjusting the speed multiplier as a function of frequency (higher speeds for low frequencies, lower or unity speeds for high frequencies), the system achieves effective time savings while preserving the clarity parameters of speech components
3Adaptability or versatility
If instructors speak at a slow rate to accommodate all learners, then adaptability is improved, but productivity is reduced
Solution Approach 1:
The system provides dynamic playback speed control that can be adjusted in real-time during playback. Learners can start at slower speeds and progressively increase to faster speeds as they become more comfortable with the material, creating a dynamic learning experience that adapts to individual progress rather than being static
Solution Approach 2:
The system automatically analyzes the audio content to identify speech segments and provides intelligent speed adjustment recommendations. The playback system serves itself by automatically applying appropriate speed modifiers based on detected speech patterns, reducing the need for manual intervention while maintaining adaptability
Data Source
AI summary
The present invention is a computer program product and method for increasing the playback speed of audio or other media files. The computer program product and method identifies pedagogic media files and adds a flag to the metadata of the media file. The flag represents the number and type of pauses or silent sections in the pedagogic media file. Based on the flag, the computer program product and method may fast forward or remove a portion of the pauses and silent sections to provide a new playback speed.