频域近红外光谱系统利用一个高频正弦信号对光源进行调制，从而在大脑这类强散射介质中形成一种漫射光子密度波。
The frequency-domain NIRS instruments modulate the light with a RF sine wave, which generates diffuse photon density wave (DPDW) in turbid tissue like brain.
它所发送的信号是由一组正交的正弦信号作为副载波，用码元周期为T的不归零方波作为基带码型调制而成的。
The transmitted signals which were modulated is a group of orthogonal sine signals as subcarrier and non-regular zero square waves that the code elements period is t as baseband coded formats.
通过使用一个周期的正弦波曲线模型的滑动拟合法，实现了正弦载波相位调制信号波形的精确解调。
By using moving one period sine wave model, the precise demodulation of PM signal wave is achieved.
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