Method to electronically clarify sound or picture information an

Details Method to electronically clarify sound or picture information an Method to electronically clarify sound or picture information an

1986-06-04

1988-03-15

Isen, Forester W.

Electrical audio signal processing systems and devices

Including amplitude or volume control

With amplitude compression/expansion

333 14, 307512, 328167, 358 36, H03G 700

Patent

active

047318520

ABSTRACT:
A method for electronically clarifying sound or picture information and an arrangement for carrying out the method. It is previously known to generate harmonics and subharmonics of a useful signal within an audio or video frequency band and to add these to the useful signal in order to improve the perceptibility. Undesirable intermodulation products are generated, however, particularly the difference intermodulation products and the non-linear amplitude ratio between generated harmonic components related to the input signal. The suggested method eliminates substantially all of these undesirable intermodulation products completely and provides a linear amplitude ratio by forming two orthogonal components (X.sub.S,X.sub.C) from the useful signal (X), compressing one or both of these components and multiplynig the result to form the harmonics (2f.sub.1, 2f.sub.2) which are thereafter mixed with the useful signal.

REFERENCES:
patent: 2866849 (1958-12-01), Lindridge
patent: 4150253 (1979-04-01), Knoppel
patent: 4412100 (1983-10-01), Orban
patent: 4495643 (1985-01-01), Orban
patent: 4569072 (1986-02-01), Van Roermund
patent: 4602381 (1986-07-01), Cugnini et al.

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