Digital tone mixer
AssigneeHualon Microelectronics Corporation
InventorWei-Fan Lu
Life of this patent
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Abstract
A digital tone mixer includes a first digital volume regulator electrically connected to a first tone generator and having a binary signal output corresponding to the desired amplitude of a pulsating tone signal from the first tone generator; a second digital volume regulator electrically connected to a second tone generator and having a binary signal output corresponding to the desired amplitude of a pulsating tone signal from the second tone generator; a binary adder for summing the binary signal outputs of the first and second volume regulators; and a pulse rate modulator receiving a binary output from the binary adder and generating a pulse train which has a pulse density corresponding to the binary output of the binary adder. The digital tone mixer has a very stable output characteristic.
Claims18
A digital tone mixer, comprising:
- a first digital volume regulator for electrical connection to a first tone generator and providing a first binary signal output corresponding to a first desired amplitude of a pulsating tone signal from said first tone generator;
- a second digital volume regulator for electrical connection to a second tone generator and providing a second binary signal output corresponding to a second desired amplitude of a pulsating tone signal from said second tone generator;
- a binary adder for summing said first and second binary signal outputs of said first and second digital volume regulators into a binary output signal;
- and
- a pulse rate modulator for generating a pulse train that has a pulse density corresponding to said binary output signal.
Dependencies are inferred from the claim text.