Broadcasting apparatus using OFDM modulation method
First Claim
1. A broadcasting apparatus using an OFDM modulation method, in which a band is divided into a plurality of layers, and a modulation method is set for each layer, characterized in that the broadcasting apparatus using an OFDM modulation method comprises modulation level setting means for setting a modulation level of a carrier for each layer, and in said modulation level setting means, the modulation level of said carrier is set so that a receivable range of a modulation signal of each layer becomes the same range as each other.
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Accused Products
Abstract
A modulation level of a carrier for video and a modulation level of a carrier for voice are adjusted in a modulation level setting circuit 5 and a modulation level setting circuit 10, respectively, so that receivable ranges of a video signal and a voice signal become the same range. Next, both of video and voice modulation signals are amplified in a transmission device 23, and are transmitted.
30 Citations
13 Claims
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1. A broadcasting apparatus using an OFDM modulation method, in which a band is divided into a plurality of layers, and a modulation method is set for each layer,
characterized in that the broadcasting apparatus using an OFDM modulation method comprises modulation level setting means for setting a modulation level of a carrier for each layer, and in said modulation level setting means, the modulation level of said carrier is set so that a receivable range of a modulation signal of each layer becomes the same range as each other.
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12. A broadcasting apparatus using an OFDM modulation method recited in claim, characterized in that said OFDM modulation device comprises a layer division section for conducting layer division of the digital signal from said studio device, an error correction coding section for conducting error correction coding of the signal for every layer after the layer division, a byte-interleave section for byte-interleaving the digital signal after the error correction coding, a convolution coding section for conducting convolution coding of the byte-interleaved digital signal, and a punctured coding section for conducting punctured coding of the convolution-coded digital signal.
Specification