Soft mute circuit
First Claim
Patent Images
1. A circuit for unobtrusively masking transient signals in an electronic device by changing gain, said circuit comprising:
- an amplifier having a first input for receiving control data and a second input for receiving a signal;
a register having an output coupled to said first input; and
an adder having an output coupled to said register for storing data in said register and having a pair of inputs, the output of said register also being coupled to one of said pair of inputs, the second of said pair of inputs being coupled to a source of slope data, said adder having a control input for adding or subtracting the slope data from the output of the register;
wherein said adder adjusts the gain of said amplifier in accordance with the slope data to change gain gradually.
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Abstract
A soft mute circuit includes a programmable amplifier controlled by a register. Data is stored in the register from an adder that combines the current data in the register with a second number for increasing or decreasing the gain of the amplifier. A summation circuit includes a plurality of inputs coupled by gates to a summation node and the summation node is coupled to an input of the programmable amplifier. The gates are controlled by suitable logic for selecting input signals in any combination. A control loop maintains the gain of the amplifier at a predetermined level.
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Citations
7 Claims
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1. A circuit for unobtrusively masking transient signals in an electronic device by changing gain, said circuit comprising:
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an amplifier having a first input for receiving control data and a second input for receiving a signal; a register having an output coupled to said first input; and an adder having an output coupled to said register for storing data in said register and having a pair of inputs, the output of said register also being coupled to one of said pair of inputs, the second of said pair of inputs being coupled to a source of slope data, said adder having a control input for adding or subtracting the slope data from the output of the register; wherein said adder adjusts the gain of said amplifier in accordance with the slope data to change gain gradually. - View Dependent Claims (2, 3, 4)
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5. In a telephone, a soft mute circuit characterized by:
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an amplifier having a first input for receiving control data and a second input for receiving a signal; a register having an output coupled to said first input; and an adder having an output coupled to said register for storing data in said register and having a pair of inputs, the output of said register also being coupled to one of said pair of inputs, the second of said pair of inputs being coupled to a source of slope data, said adder having a control input for adding or subtracting the slope data from the output of the register; wherein said adder adjusts the gain of said amplifier in accordance with the slope data to mute or unmute gradually. - View Dependent Claims (6, 7)
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Specification