Modal Reverb Frequency Segmentation for Balanced Audio Sources
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Solution Overview
Problem
Existing audio signal manipulation technologies, such as convolutional and modal reverb, struggle to isolate and manipulate individual frequencies or properties of a simulated acoustic space, leading to difficulty in balancing multiple audio sources with overlapping reverberation.
Innovation Solution
A system and method that separately controls the application of reverb effects on specific frequencies of an audio signal by analyzing the modes of vibration of an acoustic space, allowing for selective adjustment of energy at particular frequencies to enhance or dampen reverb effects without clashing with other instruments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If convolutional reverb is used to simulate an acoustic space, then the audio signal sounds as if it were produced in the given space, but it is not possible to isolate and manipulate individual frequencies or single properties of the simulated space
Solution Approach 1:
The patent segments the continuous impulse response of the acoustic space into discrete frequency components using modal analysis. Each mode represents a specific frequency resonance of the space, allowing individual frequency isolation and independent manipulation. This segmentation enables precise control over specific frequencies while maintaining the overall spatial characteristics.
Solution Approach 2:
The patent enables independent adjustment of parameters for each identified mode (frequency, decay time, gain) without affecting other modes. This parameter-level control allows users to modify specific properties of the simulated space, such as enhancing certain resonant frequencies or adjusting decay characteristics of individual modes, thereby achieving versatile manipulation flexibility.
2Ease of operation
If reverb is applied to audio signals with multiple instruments playing simultaneously, then the reverberation effect is achieved, but it becomes difficult to balance various sources with one another due to overlap
Solution Approach 1:
The patent segments the reverb effect into frequency-specific modes, allowing different balancing control for each frequency range. This enables audio engineers to adjust the presence and characteristics of reverb at different frequencies independently, improving the ability to balance multiple instruments by frequency rather than applying a uniform reverb effect to all sources.
Solution Approach 2:
The patent applies different reverb characteristics to different frequency regions based on the modal analysis results. Each mode can have its own gain, decay time, and other parameters, creating local quality variations in the reverb effect. This allows instruments in different frequency ranges to be balanced more effectively, as the reverb can be tailored to complement or recede from specific frequency content.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables effective manipulation of reverb effects on audio signals with multiple sources, ensuring balanced audio output by enhancing or dampening reverb at specific frequencies, thus improving the ability to equalize and balance different audio sources.
Implementation Method 1
modal reverb analyzes the impulse response of a given space, identifies the modes of vibration in the given space based on the analysis, and then synthesizes the individual modes of vibration of the space
Implementation Method 2
The reverb effect simulates the reverberation of a specific room or acoustic space, thus causing an audio signal to sound as if it were recorded in a room having a specific impulse response
Implementation Method 3
a collection of resonant filters is employed with filter gains set according to the source and listener positions within the space or object. Each resonant filter is driven by the source signal, and their outputs are summed to simulate an acoustic space or resonant object
Data Source
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AI summary
Methods and systems for performing modified reverb techniques for audio signals are described. The method may involve receiving an audio signal, a modal reverb effect to be applied to the audio signal, and an indication of a plurality of frequencies. Modes of vibration of a space simulated by the reverb effect may be separated into a set of frequencies included in the input, and a set frequencies not included in the input. The modal reverb effect may be modified by separately adjusting the separate sets of modes of vibration. The modified effect may then be applied to the audio signal.