DRM/AM simulcast
AssigneeSony Deutschland GmbH
InventorsJens Wildhagen, Dietmar Schill
Life of this patent
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Abstract
An AM simulcast broadcast signal combining a digital transmission signal and an analogue transmission signal in one transmission channel. The digital transmission signal is modulated to one sideband of a carrier of the transmission channel and a correcting signal (C) is modulated to the other sideband of the carrier of the transmission channel, which correcting signal (C) is determined so that the envelope demodulation of the transmission channel represents the analogue transmission signal.
Claims12
A method of generating an AM simulcast broadcast signal combining a digital transmission signal and an analogue transmission signal in one transmission channel, comprising the steps of:
- modulating the digital transmission signal to one sideband of a carrier of the transmission channel;
- and
- modulating a correcting signal (C), which is distinct from the analogue transmission signal, to the other sideband of the carrier of the transmission channel,
- wherein the correcting signal (C) is determined so that the envelope demodulation of the transmission channel represents the analogue transmission signal.
An AM simulcast broadcast signal generator for transmitting a digital transmission signal and an analogue transmission signal in one transmission channel, comprising:
- a first modulator configured to modulate the digital transmission signal to one sideband of a carrier of the transmission channel;
- and
- a second modulator configured to modulate a correcting signal (C), which is distinct from the analogue transmission signal, to the other sideband of the carrier of the transmission channel,
- wherein said second modulator is configured to determine said correcting signal (C) so that an envelope demodulation of the transmission channel represents the analogue transmission signal.
Dependencies are inferred from the claim text.