| 摘要 |
AN AUDIO CIRCUT FOR USE IN A TELEVISION RECEIVER AND THE LIKE COMPENSATES FOR THE CAPACITY SHORTAGE OF A SPEAKER BOX OR LOW FREQUENCY CHARACTERISTIC OF THE SPEAKER (9, 10) TO REPRODUCE VIVED AND VOLUMINOUS LOW FREQUNCY SOUND. L AND R SIGNAL OF THE AUDIO SIGNAL ARE MIXED, AND THAN AN ARBITRARY LOW FREQUENCY BAND COMPONENT IS EXTRACTED THERFROM BY A FILTER (22) HVING AN ARBITRARY FREQUENRY CHARACTERICISTICS, AND EXTRACTED COMPONENT IS BIASCTED BY A DISTRIBUTION MEANS (23), AND ONLY LOW RFEQUENCY BAND COMPOMENT IS ADDED TO THE ORIGINAL L AND R SIGNAL TO REPRODUCE THE AUDIO SIGNAL WHICH IS VOLUMINOUS IN A LOE FREQUENCY BAND. WITH A LOW FREQUENCY BAND WHICH IS DIFFICULT TO BE REPRODUCET BY A SPEKER (9, 10), THE HARMONIC IS STRESSED BY FULL-WAVE RECTIFICATION MEANS (29) TO STRESS LOW FREQUENCY FOUND FEELING, AND WHEN A SWITCHING CIRCUIT (27) IS PROVIDED, LOW FREQUENCY SOUND STRESSING BY AN AMPLIFIER (21) AND LOW FREQUENCY SOUNG HARMONIC STRESSING BY FULL-WAVE RECTIFICATION MEANS (29) CAN BE EASILY SWITCHED.
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