| 31. | These receivers include a photo-diode, an automatic gain control ( AGC ) circuit, and a demodulator.
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| 32. | Hybrid Analog / digital demodulators have permitted continued access to free-to-air national channels during the transition.
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| 33. | As is common to all digital communication systems, the design of both the modulator and demodulator must be done simultaneously.
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| 34. | In this case, the circuit is sometimes called a " ring demodulator ", one of many possible chopper circuits.
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| 35. | To the receiver, the signals of other users will appear to the demodulator only as a low-level noise.
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| 36. | A demodulator can only be used to observe a conversation between two fax modems, usually to record the image transmitted.
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| 37. | The demodulator consists of a delay line interferometer which delays one bit, so two bits can be compared at one time.
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| 38. | During this period the demodulator was usually a carborundum point contact diode, but sometimes a vacuum tube grid-leak detector.
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| 39. | A typical optical system for such a purpose is Mach-Zehnder interferometer or Michelson interferometer, forming an optical DPSK Demodulator.
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| 40. | The signal is then processed by a burst demodulator, ( using the MF-TDMA protocol via the data scheduler ).
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