| 摘要 |
PURPOSE: A sound signal emphasis circuit having a microphone input part is provided to compensate the phase of a middle-tone band and to emphasize and process sound signals of a low-tone band and a high-tone band. CONSTITUTION: A sound signal emphasis circuit having a microphone input part consists of the first audio signal emphasis circuit part(A), the second audio signal emphasis circuit part(B), and a microphone sound signal emphasis circuit part(C). The first audio signal emphasis circuit part(A) is comprised of a sound input part(A100), a right buffering part(A200), a left buffering part(A200'), a sound signal emphasizing and processing part(A400), a sound adjustment part(A500), a left output part(A600'), and a right output part(A600). A sound signal outputted from an external audio system is divided into a right sound signal and a left sound signal and inputted to the sound input part(A100). The right buffering part(A200) buffers the inputted right sound signal. The left buffering part(A200') buffers the inputted left sound signal. The sound signal emphasizing and processing part(A400) is composed of a differential part(A410), an integral part(A420), and a differential amplification part(A430). The differential part(A410) differentiates the buffered signals. The integral part(A420) integrates the buffered signals. The differential amplification part(A430) adds the differentiated and integrated signal components to the input signals and amplifies the differences between the added signal and the original signals. The sound adjustment part(A500) adjusts the signals generated from the sound signal emphasizing and processing part(400) within a preset range. The left output part(A600') outputs the adjusted left sound signal. The right output part(A600) outputs the adjusted right sound signal.
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