Patent ID: 6920224

Claim:
A deep bass sound booster device, that receives left-channel and right-channel input sound signals and performs sound reproduction therefrom in stereo when one of reproduction with loudspeakers and reproduction with headphones is selected, comprising: left-channel and right-channel high-pass filters to which the left-channel and the right-channel input sound signals are fed respectively, the high-pass filters having high-pass characteristics in which only frequency components higher than a predetermined frequency are allowed to pass through for outputting; left-channel and right-channel bass boosters to which the left-channel and the right-channel input sound signals are fed respectively, amplifying only frequency components lower than the predetermined frequency, and attenuating other frequency components for outputting; a bass adder for adding output signals from the left-channel bass booster and output signals from the right-channel bass booster together and outputting resultant signals; a left-channel adder capable of adding two left-channel signals together and outputting resultant signals, the two left-channel signals being output signals from the left-channel high-pass filter and output signals from the left-channel bass booster; a right-channel adder capable of adding two right-channel signals together and outputting resultant signals, the two right-channel signals being output signals from the right-channel high-pass filter and output signals from the right-channel bass booster; a left-channel switch having ON and OFF states, arranged between the left-channel adder and an output side of the left-channel bass booster, for forming, in the ON state thereof, a signal path through which the output signals from the left-channel bass booster are fed to the left-channel adder; and a right-channel switch having ON and OFF states, arranged between the right-channel adder and an output side of the right-channel bass booster, for forming, in the ON state thereof, a signal path through which the output signals from the right-channel bass booster are fed to the right-channel adder, wherein, when the reproduction with loudspeakers is selected, the left-channel and the right-channel switches are brought to the OFF state so that the output signals from the left-channel and the right-channel high-pass filters are fed to left and right loudspeakers intact respectively, and output signals of the bass adder are fed to a bass loudspeaker, and, when the reproduction with headphones is selected, the left-channel and the right-channel switches are brought to the ON state so that the two left-channel signals are added together by the left-channel adder so as to be fed to a left side of the headphones, and the two right-channel signals are added together by the right-channel adder so as to be fed to a right side of the headphones.