Method and System for Virtual Bass Enhancement

A system for bass enhancement, comprising:

• a first low pass filter configured to low pass filter an audio input signal to extract a low frequency signal from the audio input signal;
• a subsample unit configured to down sample the low frequency signal according to a down-sample factor;
• a T/F transformer configured to transform the down sampled low frequency signal from a time domain to a frequency domain;
• a fundamental frequency detector configured to determine a fundamental frequency signal of the low frequency signal in the frequency domain;
• a harmonics generator configured to generate a plurality of harmonics based on the fundamental frequency signal;
• a F/T transformer configured to transform the harmonics from the frequency domain to the time domain;
• an interpolation unit configured to interpolate zeros into the harmonics in the time domain according to an interpolation factor being equal to the down sample factor;
• a second low pass filter configured to low pass filter the interpolated harmonics;
• a delay unit configured to delay the audio input signal by a period of time;
• a synthesizer configured to synthesize the delayed audio input signal and the low pass filtered harmonics;
• and
• an AGC configured to control a gain of the synthesized signal automatically to produce an audio output signal with bass enhancement.

A system for bass enhancement, comprising:

• a T/F transformer configured to transform an audio signal from a time domain to a frequency domain;
• a fundamental frequency detector configured to determine a fundamental frequency signal of the audio signal in the frequency domain;
• a harmonics generator configured to generate a plurality of harmonics based on the fundamental frequency signal;
• a F/T transformer configured to transform the harmonics from the frequency domain to the time domain;
• a delay unit configured to delay the audio signal by a period of time;
• a synthesizer configured to synthesize the delayed audio signal and the harmonics in the time domain.