The invention discloses a method and device for strengthening
subwoofer signals. Left input sound track signals and right input sound track signals are combined and then input into a low-pass filter for low-pass filtering, low-frequency-band signals are extracted and input into a
harmonic generation module, the generated
harmonic signals of each time are fed into a band-pass filter to be controlled, then the
harmonic signals of each time are input into a harmonic
signal control module to be subjected to
harmonic amplitude control and regulation of the ratio of the harmonic signals of each time, the
subwoofer signals are output through a first output end, the harmonic signals of each time are output through a second output end and output to the harmonic generation module through a feedback module, and generation of the harmonic signals of each time is controlled in a self-
adaptation mode. The method and device for the strengthening
subwoofer signals adopt full-time-domain
processing and fixed-point calculation, and occupies a few hardware resources, a
loudness control module for harmonic signals and the like adopts self-
adaptation Q-value calibration adjustment, the output subwoofer signals avoid overflowing, and the maximum accuracy of the output subwoofer signals is guaranteed. The control over the
loudness and the sound type is optimized, a
smoothing filtering module carries out
smoothing filtering on the adjusted harmonic signals, and therefore the sound effect sounds more natural and continuous.