Apparatus and a method for restoring an A-level clipped signal
First Claim
1. Apparatus which corrects clipping distortion in a received signal, whereby portions of a transmitted signal are lost in the received signal, the apparatus comprising:
- an input terminal for receiving the received signals;
a quantizer circuit, coupled to the input terminal, which detects the clipping distortion in the received signal and which generates a pulse signal, wherein each pulse of the pulse signal corresponds to a respectively different portion of the received signal which portion has been subject to the clipping distortion;
waveform generating means, coupled to the quantizer circuit and responsive to the pulse signal, including means for generating wave segments which approximate the portions of the received signal that were lost as a result of the clipping distortion;
means for combining the generated wave segments and the received signal to produce an output signal, at an output terminal, which output signal approximates the transmitted signal.
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Accused Products
Abstract
A circuit which restores portions of an input signal lost due to clipping distortion includes a comparator which locates the portions of the input signal which have been subject to clipping distortion and generates a pulse signal where each pulse corresponds to a clipped portion of the input signal. This pulse signal is used to generate parabolic pulses which are combined with the input signal to generate a modified signal that approximates the input signal without the clipping distortion. One circuit generates the pulse signals by controlling an oscillator to produce a parabolic pulse train which changes in frequency and amplitude to match each pulse of the pulse signal and then selecting one of the parabolic pulses for each pulse of the pulse signal. Another circuit generates the parabolic pulses by doubly integrating the pulses of the pulse signal.
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Citations
10 Claims
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1. Apparatus which corrects clipping distortion in a received signal, whereby portions of a transmitted signal are lost in the received signal, the apparatus comprising:
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an input terminal for receiving the received signals; a quantizer circuit, coupled to the input terminal, which detects the clipping distortion in the received signal and which generates a pulse signal, wherein each pulse of the pulse signal corresponds to a respectively different portion of the received signal which portion has been subject to the clipping distortion; waveform generating means, coupled to the quantizer circuit and responsive to the pulse signal, including means for generating wave segments which approximate the portions of the received signal that were lost as a result of the clipping distortion; means for combining the generated wave segments and the received signal to produce an output signal, at an output terminal, which output signal approximates the transmitted signal. - View Dependent Claims (2, 3, 4, 5)
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6. A method for correcting clipping distortion in a received signal, whereby portions of a transmitted signal are lost in the received signal, the method comprising the steps of:
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generating a pulse signal, responsive to the received signal, wherein each pulse of the pulse signal corresponds to a respectively different portion of the received signal which portion has been subject to the clipping distortion; generating wave segments, responsive to the pulse signal, which wave segments approximate the portions of the received signal that were lost as a result of the clipping distortion; and combining the generated wave segments and the received signal to produce an output signal which approximates the transmitted signal. - View Dependent Claims (7, 8, 9, 10)
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Specification