Circuit and method for automatically limiting the amplitude of broadcast audio signals
First Claim
Patent Images
1. A circuit for processing broadcast signals, comprising:
- first circuitry for receiving a broadcast signal and processing the broadcast signal to extract and output a first audio signal;
an attenuator for receiving the first audio signal and attenuating the first audio signal based upon a first control signal to generate a second audio signal;
second circuitry for receiving the second audio signal and one of attenuating and amplifying the second audio signal based upon a second control signal to generate a third audio signal; and
feedback circuitry for generating the first control signal based upon the second audio signal, the feedback circuitry includingthird circuitry for receiving the second audio signal and determining a Root Mean Square (RMS) value of the second audio signal and providing an output signal based upon the RMS value, anda comparator for receiving the output signal and comparing the output signal with at least one reference signal to generate the first control signal.
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Abstract
A circuit for processing broadcast signals that includes circuitry for receiving and processing broadcast signals which contain audio information and providing a first audio signal, and circuitry for controlling the amplitude of a received second audio signal in response to a first control signal, and providing a third audio signal wherein the circuit further comprises circuitry that receives the first audio signal and provides the second audio signal for automatically limiting the amplitude of the first audio signal in response to at least one reference signal.
17 Citations
19 Claims
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1. A circuit for processing broadcast signals, comprising:
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first circuitry for receiving a broadcast signal and processing the broadcast signal to extract and output a first audio signal; an attenuator for receiving the first audio signal and attenuating the first audio signal based upon a first control signal to generate a second audio signal; second circuitry for receiving the second audio signal and one of attenuating and amplifying the second audio signal based upon a second control signal to generate a third audio signal; and feedback circuitry for generating the first control signal based upon the second audio signal, the feedback circuitry including third circuitry for receiving the second audio signal and determining a Root Mean Square (RMS) value of the second audio signal and providing an output signal based upon the RMS value, and a comparator for receiving the output signal and comparing the output signal with at least one reference signal to generate the first control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method for processing broadcast signals comprising the steps of:
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receiving a broadcast signal and processing the broadcast signal to extract and output a first audio signal; attenuating the first audio signal to generate a second audio signal based upon a first feedback control signal; and one of attenuating and amplifying the second audio signal based upon a second control signal to generate a third audio signal; wherein the step of attenuating the first audio signal includes determining a Root Mean Square (RMS) value of the second audio signal and providing an output signal that is based upon the RMS value, and comparing the output signal with at least one reference signal to generate the first feedback control signal. - View Dependent Claims (17, 18, 19)
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Specification