Telecommunications – Transmitter – Amplitude modulation
Patent
1996-09-30
1999-07-27
Eisenzopf, Reinhard J.
Telecommunications
Transmitter
Amplitude modulation
455 45, 455118, 332151, 375216, H03C 152
Patent
active
059306874
ABSTRACT:
An apparatus and method for generating a broadcast waveform is provided which, for generating an in-phase component, includes an in-phase digital signal generator; a first filter for filtering the in-phase digital signal; a first digital-to-analog converter for converting the filtered digital signal into a first analog signal; an AM baseband signal generator producing an AM baseband signal; a first summer for summing the first analog and AM baseband signals to produce a composite analog signal; and a first modulator for modulating the composite analog signal with a first carrier signal at a transmission frequency, thus producing a first modulated signal. To provide the quadrature component of the broadcast waveform, the waveform generator includes a quadrature digital signal generator producing a quadrature digital signal; a second digital-to-analog converter for converting the quadrature digital signal into a second analog signal; a second modulator for modulating the second base-band signal with a second carrier signal; and a second summer for summing the first and second modulated signals, thus producing the broadcast waveform. The apparatus improves the signal-to-noise ratio in analog AM receivers, especially at higher frequencies.
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Carlin Barry Walter
Dapper Mark J.
Geile Michael J.
Armstrong Darnell R.
Eisenzopf Reinhard J.
Lenart Robert P.
USA Digital Radio Partners, L.P.
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