Harmonic tone generator for low level input audio signals and sm

Details Harmonic tone generator for low level input audio signals and sm Harmonic tone generator for low level input audio signals and sm

1992-01-13

1996-11-26

Nelms, David C.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Frequency or repetition rate conversion or control

84602, 84616, H03B 1900, G10H 700

Patent

active

055789480

ABSTRACT:
A harmonic tone generator produces a harmonics signal even for input audio signals of a small amplitude. Conversion of a digitized audio signal in accordance with a predetermined non-linear function is performed also for an audio signal of a small amplitude. According to the second aspect of the invention, a level difference between the digital audio signal level in the present sampling time and the audio signal level in the preceding sampling time is detected and the detected level difference is converted to an output value in accordance with a predetermined non-linear function by a non-linear converting circuit. The converted output value is accumulated. According to the third aspect of the invention, the detected level difference is converted to a function conversion output in accordance with a predetermined function by a non-linear converting circuit. A gain of an amplifier to amplify the audio signal in the present sampling time is changed in accordance with the function conversion output.

REFERENCES:
patent: 4700390 (1987-10-01), Machida
patent: 5086475 (1992-02-01), Kutaragi et al.

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