Ideal equalizer and ideal equalization method for infinite impulse response filtering

Abstract

The present invention discloses an ideal equalizer and an ideal equalizing method which uses an infinite impulse response (IIR) filtering. The ideal equalizer includes N IRR filters SB1 (f) to SBN (f) for the receiving of an input signal, N gain adjustments coupled with the filters and an adder. The N gain adjustments generate N gain adjustment outputs and the adder accumulates the N gain adjustment outputs to generate an ideal equalizing output signal, and N is more than two. The gain adjustments equalize the N frequency band of the input signal. When the gain adjustments equal actually, theideal equalizer using IIR filtering has an actually flat frequency response.

Description

technical field [0001] The invention relates to an equalizer (Equalizer) and a related method, in particular to an ideal equalizer and an ideal equalization method using infinite impulse response filtering. Background technique [0002] Due to the rapid development of audio-visual systems, such as audio systems and television systems, equalizers are important components that developers of related technologies want to develop, but the quality varies greatly. [0003] Please refer to figure 1 , which is a screenshot of the application WINAMP in the Windows operating system to illustrate an example application of the equalizer. The application program WINAMP is a common sound effect control application program in the window operating system. It includes many operation buttons, mainly marking the equalizer 100, the volume control 102 and the left and right channel balance 104. This patent application intends to discuss the equalizer 100 components. figure 1 , the equalizer 100...

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Problems solved by technology

[0006] On the other hand, as mentioned above, those who are familiar with the art can understand that in the prior art, in order to achieve a high-quality flat frequency response, it is necessary to pay a high-cost hardware price

In order to achieve an ideal flat frequency response, the conventional technology must use inverse Fourier transform (inverse Fourier transform) in the circuit design, set up complex circuits in the time domain, and use a high-performance 32-bit microprocessor, such as the well-known ARM, High-performance microprocessors such as MIPS operate, and those skilled in the art know that these high-performance microprocessors are expensive, and such solutions also severely waste the hardware resources of the microprocessor

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