Multiplexed signal transmitter and multiplexed signal receiver

Details Multiplexed signal transmitter and multiplexed signal receiver Multiplexed signal transmitter and multiplexed signal receiver

H - Electricity

04

N

350/34

H04N 7/08 (2006.01) H04N 7/00 (2006.01) H04N 7/015 (2006.01) H04N 7/045 (2006.01) H04N 11/24 (2006.01)

Patent

CA 2018395

Abstract of the Disclosure A main signal as the existing television signal and a helper signal for high definition are prepared in a transmitter. The energy of the main signal for a plu- rality of pixels is sequentially detected by an energy detector constituted by an absolute value circuit and an accumulator. The helper signal is controlled by a level controller, constituted by an adder and a divider, in such a way that its level follows according to the level of the detected energy. The level-controlled helper signal is frequency-multiplexed with the main signal having a frequency band of a removed region by a fre- quency multiplexer. A frequency-multiplexed signal separator of a receiver separates the multiplexed signal into the main signal and the helper signal. The energy of the separated main signal for a plurality of pixels is sequentially detected by an energy detector consti- tuted by an absolute value circuit and an accumulator. The separated helper signal has its frequency band restored to the original band from the removed region by a frequency domain restoring circuit. The restored helper signal is subjected to level control by a level controller, constituted by an adder and a multiplier, in the opposite characteristic to that of the sender side in accordance with the level of the detected energy.

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