Method of generating test tone signal and test-tone-signal...

Electrical audio signal processing systems and devices – Including frequency control – Automatic tone control

Reexamination Certificate

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C381S061000, C333S02800T

Reexamination Certificate

active

07747027

ABSTRACT:
A method of generating a test tone signal includes generating a fundamental tone signal, which is a sinusoidal signal having a predetermined frequency; generating a first group of harmonic tone signals having different frequencies that are integral multiples of the predetermined frequency; generating a second group of the harmonic tone signals having different frequencies that are integral multiples of the predetermined frequency, at least part of the second group of the harmonic tone signals having frequencies different from frequencies of the first group of the harmonic tone signals; adding the fundamental tone signal to the first group of the harmonic tone signals to generate a first test tone signal; adding the fundamental tone signal to the second group of the harmonic tone signals to generate a second test tone signal; and outputting the first and second test tone signals at predetermined intervals.

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European Search Report, EP 06 25 2048, Apr. 9, 2008.

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