Sound Output Control for Slow Motion Frame Rate Conversion
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Solution Overview
Problem
When displaying images captured at a high frame rate at a lower frame rate for slow motion, the sound output becomes undesirable due to pitch reduction and phonemic degradation, necessitating more flexible sound output methods.
Innovation Solution
An information processing device with a sound output control unit that performs switching or mixing control based on input image and sound signals, reproduction speed, and user input, using time extension processing, harmonic separation, and ambient noise management to select appropriate sound output methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If display reproduction is performed at a frame rate lower than the imaging frame rate (slow motion), then smooth slow motion display is achieved and user can grasp movement in detail, but sound quality deteriorates due to pitch reduction and phonemic degradation
Solution Approach 1:
The system dynamically switches between multiple sound output methods (original sound, time-extension processed sound, and mixed sound) based on the reproduction speed ratio. When slow motion reproduction is detected, the system activates time-extension processing or mixing controls to maintain sound quality, while at normal speed it uses original sound, making the sound processing adaptive to reproduction conditions
Solution Approach 2:
The system changes sound processing parameters based on reproduction speed. It calculates the reproduction speed ratio and uses this to control the degree of time-extension processing or mixing ratios, adjusting sound output parameters dynamically according to the frame rate relationship between captured and displayed images
2Reliability
If time extension processing is applied to maintain sound quality during slow motion, then pitch reduction and phonemic degradation are prevented, but processing complexity increases
Solution Approach 1:
The system implements dynamic processing by selectively applying time-extension processing only when slow motion reproduction is detected through reproduction speed information. The processing complexity is adjusted dynamically based on actual reproduction conditions, avoiding unnecessary processing at normal speed
Solution Approach 2:
The system introduces a sound output control unit as an intermediary that receives both image signals and sound signals, analyzes reproduction speed, and coordinates between original sound and time-extension processed sound. This intermediary manages the complexity by centralizing control logic and providing a unified interface
3Adaptability or versatility
If multiple sound output methods are provided for flexible sound output, then sound quality can be maintained during slow motion, but control complexity increases
Solution Approach 1:
The sound output control unit is designed with multi-functionality to handle multiple sound output methods (original sound output, time-extension processed sound output, and mixed sound output) through a single integrated control mechanism. This universal controller manages all sound processing tasks, reducing the need for separate control systems for each method
Solution Approach 2:
The system uses reproduction speed information as feedback to automatically determine which sound output method to apply. By monitoring the relationship between imaging frame rate and display frame rate, the system automatically adjusts sound processing without requiring manual user control, simplifying the user interface while maintaining flexibility
Data Source
AI summary
An information processing device including a sound output control unit that performs control related to sound output, in a case where an image captured at a first frame rate is subjected to display reproduction at a second frame rate lower than the first frame rate, on the basis of at least one of an input image signal, an input sound signal, reproduction speed information indicating a ratio between the first frame rate and the second frame rate, or user input information, in which the control related to the sound output performed by the sound output control unit includes switching control that selects one sound output method from a plurality of sound output methods and performs switching, or mixing control that performs mixing of sound signals obtained by the plurality of sound output methods.