BTSC ENCODER
The disclosed BTSC encoder includes a left high pass filter means for receiving a digital left channel audio signal and for digitally high pass filtering the digital left channel audio signal and thereby generating a digital left filtered signal; a right high pass filter means for receiving a digital right channel audio signal and for digitally high pass filtering the digital right channel audio signal and thereby generating a digital right filtered signal; a matrix means for receiving the digital left and digital right filtered signals, and including means for summing the digital left and digital right filtered signals and thereby generating a digital sum signal, and including means for subtracting one of the digital left and digital right filtered signals from the other of the digital left and digital right filtered signals and thereby generating a digital difference signal; a difference channel processing means for digitally processing the digital difference signal; and a sum channel processing means for digitally processing the digital sum signal.
1 . A method of setting the gain of a wideband compression unit in a digital adaptive signal weighting system responsive in accordance with the BTSC standard, comprising:
calculating and electronically storing values representative of one of an input signal and an output signal, and
selecting and retrieving a particular stored value as a function of the value of an input signal where stored values represent an output signal, and as a function of the value of an output signal where stored values represent an input signal.
2 . A digital adaptive signal weighting system which accepts one or more digital input signals and modifies their electrical characteristics according to the BTSC standard to produce one or more digital output signals.
3 . The digital adaptive signal weighting system according to claim 2 , wherein the input signal is a composite signal comprising one or more digital audio signals.
4 . The digital adaptive signal weighting system according to claim 2 , wherein the output signal is a composite signal comprising one or more digital audio signals.