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/lvgl-3.7.0/demos/music/
Dlv_demo_music_main.c818 int32_t ampl_mod = get_cos(f * 360 / band_w + 180, 180) + 180; in spectrum_draw_event_cb() local
822 r[t] += (ampl_main * ampl_mod) >> 9; in spectrum_draw_event_cb()