frequency masking

frequency masking

An audio compression technique that eliminates sounds that are quieter when compared to sounds with similar frequencies that are much louder. See temporal masking and perceptual audio coding.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
Computational efficiency is achieved with frequency masking and PI technique instead of IIR filter usage.
This paper presents a design method that consists of a low-order FIR filter realized with a frequency masking technique, and included in the sharpening method.
In this section is suggested frequency masking technique as an initial filter, in sharpening method realization.
All these properties of sharpening method with frequency masking and PI technique are used in section V for narrowband filter realization.
FIR FILTER SHARPENING METHOD AND FREQUENCY MASKING TECHNIQUE
Frequency masking technique is a multirate technique which is appropriate for sharp linear phase filters realizations [5, 6, and 7].
Although the frequency masking technique is a multirate technique, actually there is no sampling rate change through the filter.
In our case, the amplitude change function is realized with FIR filters and frequency masking technique, thus these filters are ideal candidates for the modified PI technique implementation.
So, with choosing M = 2, the characteristic of frequency masking filter, recorded in out 1 (Figure 10) will be:
* Periodic model filter--replace each delay with M * K delays, M is the frequency masking factor, and K is the H(z) order.
Figure 14 shows the amplitude characteristic of filter sharpening structure with amplitude change function F(H) = [3H.sup.2] - [2H.sup.3], and factor M = 2 of frequency masking subsystem filter.

Full browser ?