| http://www.w3.org/ns/prov#value | - The modulators may be, for example, a simple modulator such as an amplitude shifted keying (ASK) modulator, a frequency shifted keying (FSK) modulator, a differential phase shift keying (DPSK) modulator, a differential quadrature phase shift keying (DQPSK) modulator, or a duobinary modulator. [0059] The modulated signals are each passed through an intermediate frequency band pass filter 58, 60, 62
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