The formulas for the transformation of sound levels between linear spectrum and multiplex frequency band, or among various multiplex frequency bands, are derived and the corrected value is calculated.
推导线性谱声压级、倍频带声压级以及各倍频带声压级之间的转换公式，计算出修正值。
As frequency divided multiplex access is widely adopted in communication satellite system, strict frequency spectrum limits on modulator is mandated.
通信卫星的频分复用机制，对卫星通信系统的发送信号频谱成型提出了严格的要求。
Orthogonal frequency division multiplex (OFDM) is currently one of the most popular techniques for future broadband wireless communications.
正交频分复用(OFDM)技术是未来宽带无线通信中最流行的技术之一。
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