Electrical audio signal processing systems and devices – Sound effects
Patent
1996-11-26
1998-10-27
Isen, Forester W.
Electrical audio signal processing systems and devices
Sound effects
381 98, H03G 300
Patent
active
058287558
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention concerns a method and device for processing signals.
In particular, it concerns a method and device for processing audio signals, particularly in order to improve the sound quality and/or to create special effects.
BACKGROUND OF THE INVENTION
It is known that audio signals can be subject to different types of interferences. An important type of interference hereby is noise. Moreover, various other types of interferences may occur such as distortions which have a negative effect on the sound clarity.
SUMMARY OF THE INVENTION
The present invention concerns a method and device for processing signals which makes it possible to significantly improve the sound quality of audio signals, irrespective of the source of the signal to be improved.
To this end, the invention concerns a method for processing signals, in particular for treating audio signals, characterized in that it mainly consists in the supply of an input signal to be treated; in the isolation of a number of signals from the input signal which are mainly situated in a predetermined part of the sound range; in the additional generation of higher harmonics on the basis of the isolated signals; and in the formation of an output signal by combining the generated higher harmonics with at least part of the above-mentioned input signal, whereby this input signal was treated or not treated before being combined.
According to a preferred embodiment, in order to produce the isolated signal, on the basis of which the higher harmonics are generated, the tones which exceed a certain value are isolated and transmitted. The pass limit, in other words the frequency for which the tones are allowed to pass, is preferably situated between 3,000 and 5,000 Hz, and better still at about 3,500 Hz.
Moreover, it is preferable that only those tones which are situated under a certain value are isolated, in other words that the tones which are situated above this value are eliminated or at least considerably abated. The pass limit, in this case the limit above which the tones are eliminated or considerably abated, is preferably situated between 4,000 and 19,000 Hz and better still at about 7,000 Hz.
According to a special embodiment of the method according to the invention, the input signal is treated before being combined with the signal which consists of the additionally generated higher harmonics. This treatment may consist in that the tones within a certain range also eliminated and/or abated. Preferably, only tones below a certain pass limit are let through, whereby this pass limit is preferably situated at about 7,000 Hz.
Also, according to the most preferred embodiment, the higher harmonics are generated on the basis of the signals of only a restricted band of the sound range, namely those included between 3,500 and 7,000 Hz.
The combination of the signal which produces the additionally generated higher harmonics with the input signal which was either treat or not treated, in order to provide for the above-mentioned end signal, is preferably realized by supplying both signals to an adder amplifier.
According to yet another special embodiment, in order to optimize the aimed effect, an additional control is preferably provided, this additional control consists in that the passage of the additional higher harmonics is regulated as a function of the input signal, or at least as a function of the intensity of this input signal. This control preferably makes it possible for the signal of the additionally generated higher harmonics to be more or less amplified as a function of the input signal.
Depending on the desired effect, different methods can be used with this control. Preferably, the input signal, or at least part thereof, is transformed into a control signal which provides a required amplification for the signal with the additionally generated higher harmonics. This control signal can be obtained by rectifying the above-mentioned input signal, or a part thereof, and subsequently transforming it into a typical control si
REFERENCES:
patent: 4700390 (1987-10-01), Machida
patent: 5388159 (1995-02-01), Sakata
De Smet Francis
Feremans Eric Edmond
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