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非对称数字用户线(ADSL)所使用的离散多音调(DMT)频率。乃是某一共同频率的各整倍数,而其符号周期(symbol period)则是此共同频率的倒数。在符号周期内进行积分将使正弦和余弦的正交波形的乘积在此共同频率的各整倍数上等于零(在具有同频率的那些整倍数频率处则除外)。正如ADSL标准(TI.413)所规定的那
Discrete Multi-Tone (DMT) Frequency for Asymmetric Digital Subscriber Line (ADSL). Is the integral multiple of a common frequency, and the symbol period is the reciprocal of this common frequency. Integrating within the symbol period results in the product of the sine and cosine quadrature waveforms equal to zero on each integral multiple of this common frequency (except at those integer multiple frequencies with the same frequency). As ADSL standard (TI.413) provides that