Restoration of high frequencies by frequency translation
AssigneeQuickfilter Technologies, Inc.
InventorJustin Lamar Allen
Life of this patent
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Abstract
A method, circuit and article of manufacture for restoring high-frequency content in a first signal includes down-sampling the first signal by a factor to give a second signal; up-sampling the second signal by the same factor to give a third signal; low-pass filtering the third signal to give a fourth signal; high-pass filtering the fourth signal to give a fifth signal; and, adding the fifth signal to the first signal.
Claims19
A method for restoring high-frequency content in a first signal, comprising:
- down-sampling the first signal by a factor to give a second signal;
- up-sampling the second signal by the same factor to give a third signal;
- filtering the third signal to give a fourth signal;
- high-pass filtering the fourth signal to give a fifth signal;
- and, adding the fifth signal to the first signal.
A circuit for restoring high-frequency content in a first signal, comprising:
- a down-sampler for down-sampling the first signal by a factor to give a second signal;
- an up-sampler connected to the down-sampler for up-sampling the second signal by the same factor to give a third signal;
- a first filter connected to the down-sampler for filtering the third signal to give a fourth signal;
- a high-pass filter connected to the low-pass filter for high-pass filtering the fourth signal to give a fifth signal;
- an adder for summing the fifth signal with the first signal.
An article of manufacture comprising a computer-readable medium having computer-executable instructions for performing a method for restoring high-frequency content in a first signal, the method comprising:
- down-sampling the first signal by a factor to give a second signal;
- up-sampling the second signal by the same factor to give a third signal;
- filtering the third signal to give a fourth signal;
- high-pass filtering the fourth signal to give a fifth signal;
- and, adding the fifth signal to the first signal.
Dependencies are inferred from the claim text.