Virtual Bass Frequency Translation for Small Speaker Audio
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for enhancing bass performance in small loudspeakers, such as amplification and virtual pitch techniques, face issues like distortion, battery drain, and incorrect pitch perception, leading to degraded audio quality.
Innovation Solution
An apparatus that transforms an audio signal into frequency components, extracts the bass portion, estimates the fundamental frequency, and shifts it by an integer multiple of the estimated frequency to create a virtual bass signal, which is then added back into the original signal, ensuring efficient production and maintaining harmonic structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If low-frequency components are amplified to boost bass performance, then bass loudness is improved, but speaker efficiency deteriorates and energy consumption increases
Solution Approach 1:
The invention changes the frequency parameter of bass components by translating them to higher frequencies (e.g., from 50-200 Hz to 200-400 Hz or higher). This allows the speaker to reproduce bass sounds at frequencies where it has better efficiency, reducing energy consumption while maintaining or improving perceived bass loudness through psychoacoustic effects.
2Illumination intensity
If low-frequency amplification is applied, then bass loudness is improved, but speaker reliability deteriorates due to excessive coil excursion
Solution Approach 1:
The invention translates bass frequency components to higher frequencies before output. This parameter change in frequency reduces the physical excursion requirements of the speaker coil, preventing distortion and damage while maintaining the perceived bass effect through harmonic relationships and psychoacoustic processing.
3Use of energy by moving object
If frequency scaling is applied to shift bass to higher frequencies, then speaker efficiency is improved, but pitch accuracy deteriorates
Solution Approach 1:
The invention performs preliminary analysis to identify and extract the fundamental frequency and harmonic structure of bass components before frequency translation. By pre-processing the signal to preserve harmonic relationships and applying the translation systematically, the original pitch information is maintained even though the physical frequencies are shifted to more efficient speaker operating ranges.
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
This approach provides a more realistic and efficient enhancement of bass perception, reducing distortion and battery drain while maintaining the original sound quality, particularly in speakers with poor bass production capabilities.
Implementation Method 1
the human ear apparently can infer the pitch from the harmonic tones alone. This phenomenon is referred to as 'virtual pitch'.
Implementation Method 2
musical instruments and human vocal cords usually produce this sensation using a set of tones with a complex harmonic structure, such as 100 Hz, 200 Hz, 300 Hz, etc.
Data Source
AI summary
Provided are, among other things, systems, methods and techniques for processing an audio signal to add virtual bass. In one representative embodiment, an apparatus includes: an input line that inputs an original audio signal; an estimator, coupled to the input line, that estimates a fundamental frequency of a bass sound within the original audio signal; a bass extraction filter, coupled to the input line, that extracts a bass portion of the original audio signal that is at least 1 octave wide and includes the fundamental frequency; a frequency translator, coupled to the bass extraction filter, that shifts the bass portion, in its entirety, by a positive frequency increment that is an integer multiple of the fundamental frequency estimated by the estimator, thereby providing a virtual bass signal; and an adder having 1) inputs coupled to the original audio signal and to the virtual bass signal and 2) an output.