Method for superimposing data on amplitude-modulated signals |
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| Authors: | Lockhart GB Al-Jalili YO |
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| Affiliation: | University of Leeds, Department of Electrical & Electronic Engineering, Leeds, UK; |
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| Abstract: | The principles of a new modulation scheme are described which permit an additional data channel to be superimposed on conventional DSBAM signals without increasing band-width or envelope distortion. This scheme, named zero synchronous frequency modulation (ZSFM), requires additional signal processing and provision for combined AM/FM at the transmitter. At the receiver, the data signal is detected by a simple frequency demodulator, while envelope detection of the AM signal is performed in the usual way. |
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