Method to expand an analog signal and device to implement the method
First Claim
1. A method for automatically modifying the shape of part of an analog signal for emphasizing a specifically interesting portion of the signal, said signal being successively an initial pulse followed by substantially rectangular shaped pulses having a fast rise time and a fast fall time, said method comprising multiplying each pulse of the input signal by a variable coefficient depending on the rise time of said respective pulse, for obtaining an intermediate amplified signal;
- and subtracting a value from the intermediate amplified signal, for obtaining an output signal, said subtracted value being constant from one pulse to another and being defined by a ramp signal starting when the output signal corresponding to said initial pulse signal reaches a first threshold and stopping when said last mentioned output signal reaches a second threshold.
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Abstract
A method for enlarging part of an analog input signal, and a circuit to implement this method. The circuit includes an amplifier which receives the analog input signal, the gain of which is controlled by a programming signal which varies as a function of the leading edge of the analog input signal and of a maximum threshold of the output signal from the circuit. A subtractor receives a substraction signal which is a function of an upper threshold and a lower threshold of the output signal from the circuit, and a signal from the amplifier, and then provides the output signal from the circuit.
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5 Claims
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1. A method for automatically modifying the shape of part of an analog signal for emphasizing a specifically interesting portion of the signal, said signal being successively an initial pulse followed by substantially rectangular shaped pulses having a fast rise time and a fast fall time, said method comprising multiplying each pulse of the input signal by a variable coefficient depending on the rise time of said respective pulse, for obtaining an intermediate amplified signal;
- and subtracting a value from the intermediate amplified signal, for obtaining an output signal, said subtracted value being constant from one pulse to another and being defined by a ramp signal starting when the output signal corresponding to said initial pulse signal reaches a first threshold and stopping when said last mentioned output signal reaches a second threshold.
- View Dependent Claims (2, 3, 4, 5)
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