| 摘要 |
PURPOSE: An audio noise signal removing circuit is provided to remove a noise by reducing a high voice frequency characteristic when a high voice component is less than a low voice component after detecting levels of the high voice component and the low voice component respectively and comparing the detected levels. CONSTITUTION: An audio detecting unit(200) detects an audio signal from a signal of a channel selected through a tuner(100). An external signal inputting unit(300) inputs an external signal from the outside. A signal switching unit(400) selects the audio signal detected through the audio detecting unit or the external signal inputted through the external signal inputting unit. A signal component detecting unit(1000) respectively detects a high voice signal component and a low voice signal component from a signal outputted from the signal switching unit. A micro computer(500) obtains the difference between the high voice signal component and the low voice signal component detected through the signal component detecting unit, and regulates a high voice frequency characteristic by the obtained difference. Also, the micro computer receives an AGC voltage of the tuner and then judges whether or not a field is light, and regulates the high voice frequency characteristic and volume of the audio signal according to the difference between the signal component and the light field.
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