Digital stereo FM modulator

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Digital stereo FM modulator

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A digital FM modulator, incorporating a digital stereo generator, has been built using a direct digital synthesiser with a variable bit output. Simulations and hardware experiments have been used to show that a 10 bit output is sufficient to produce demodulated signals with signal to distortion ratios of more than 80 dB.

Inspec keywords: direct digital synthesis; digital audio broadcasting; radio transmitters; modulators; frequency modulation

Other keywords: digital stereo FM modulator; direct digital synthesiser; FM broadcasting; digital stereo generator; variable bit output

Subjects: Modulators, demodulators, discriminators and mixers; Modulation and coding methods; Radio and television transmitters

References

    1. 1)
      • Australian Broadcasting Authority, ‘Emission standardfor the australian frequency modulation sound broadcasting service’.Australian Department of Transport and Communications, July 1992.
    2. 2)
      • Harris Corporation, ‘The “digit” digitalFM modulator specifications’. Harris data sheet, July 1995.
    3. 3)
      • E.R. Twitchell . A digital approach to an FM modulator. IEEE Trans. Broadcasting , 2 , 106 - 110
http://iet.metastore.ingenta.com/content/journals/10.1049/el_19961136
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