Method and apparatus for automatic signal level adustment
First Claim
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1. Apparatus for automatic signal level adjustment comprising:
- control means for forming a first control signal which is a function of a weighted sum of a predetermined number, greater than one, of consecutive half cycle peak magnitudes of an input signal, whereby the first control signal is dependent on a frequency content of the input signal, andprocessing means for operating on the input signal using a first control transfer function which varies in accordance with the first control signal to provide an output signal which at least partly depends on the first control signal.
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Abstract
An input signal passes by way of a variable gain amplifier to an output terminal. In addition the input signal is applied to a peak detector and then a control signal is derived by applying a smoothing function taking into account a predetermined number of peak values. A selected gain function is applied to the control signal. The control signal is preferably also multiplied by a compression control signal which acts on individual half cycles to bring all peak values in the output signal to the same value.
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Citations
15 Claims
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1. Apparatus for automatic signal level adjustment comprising:
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control means for forming a first control signal which is a function of a weighted sum of a predetermined number, greater than one, of consecutive half cycle peak magnitudes of an input signal, whereby the first control signal is dependent on a frequency content of the input signal, and processing means for operating on the input signal using a first control transfer function which varies in accordance with the first control signal to provide an output signal which at least partly depends on the first control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method of automatic signal level adjustment comprising the steps of
forming a first control signal which is a function of a weighted sum of a predetermined number, greater than one, of consecutive peak magnitudes of an input signal, whereby the first control signal is a function of a frequency content of the input signal, and operating on the input signal using a first control transfer function which varies in accordance with the first control signal to provide an output signal which at least partly depends on the first control signal.
Specification