Equalization of an Audio Signal
a technology of equalization and audio signal, applied in the field of equalization of audio signal, can solve the problems of frequency-dependent change in delay imposed on the signal, unintended filtering effect, complex,
Active Publication Date: 2013-08-01
OXFORD DIGITAL
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Benefits of technology
The invention provides a method to process an input audio signal by creating multiple output audio signals from the input audio signal through different processing. The first output audio signal is subject to a target audio equalization operation that uses a target filter twice, while other output audio signals are compensated for phase shifts using a compensation filter that corresponds to the poles of the target filter's transfer function. The invention also provides a method for determining the configuration for audio equalization of an input audio signal, where each output audio signal receives a different processing for compensation. The technical effects of the invention include improved audio quality, reduced noise, and improved overall listening experience.
Problems solved by technology
In general the filtering of a signal to produce a desired frequency response has the side effect of also causing a frequency-dependent change in the delay imposed upon the signal.
However FIR filters have disadvantages when used for audio equalization, in that they are very much more complex, more difficult to control and have greater delay than IIR (infinite impulse response) filters.
However, a problem with phase shift occurs when two versions of the same signal, but with different phases, are combined or added together.
When this happens, the frequency-dependent difference in relative phases between the two versions causes undesirable and unintended filtering effects.
Frequently more than one transducer is present in a single cabinet and this can lead to similar constraints to those mentioned above.
Such user control can only be achieved in this manner if the two signals are in phase throughout the audio band.
Method used
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Embodiment Construction
[0029]In the description that follows and in the figures, certain embodiments of the invention are described. However, it will be appreciated that the invention is not limited to the embodiments that are described and that some embodiments may not include all of the features that are described below. It will be evident, however, that various modifications and changes may be made herein without departing from the broader spirit and scope of the invention as set forth in the appended claims.
[0030]Embodiments of the invention may be executed by a computer system. FIG. 1 schematically illustrates an example computer system 100 according to an embodiment of the invention. The system 100 comprises a computer 102. The computer 102 comprises: a storage medium 104, a memory 106, a processor 108, a storage medium interface 110, an output interface 112, an input interface 114 and a network interface 116, which are all linked together over one or more communication buses 118.
[0031]The storage m...
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A method of processing an input audio signal, the method comprising forming a plurality of output audio signals from the input audio signal, wherein each output audio signal is formed by performing respective processing on the input audio signal, wherein for a first output audio signal there is a target audio equalization operation comprising a target filter twice, wherein for the first output 10 audio signal, the respective processing comprises a first audio equalization operation, the first audio equalization operation being the target audio equalization operation modified to compensate for phase shifts that correspond to zeros of the transfer function of the target audio equalization operation, wherein for each output audio signal other than the first output audio signal, the respective 15 processing comprises a compensation filter that compensates for phase shifts that correspond to poles of the transfer function of the target audio equalization operation. 20
Description
FIELD OF THE INVENTION[0001]The present invention relates to methods of processing an input audio signal, methods of determining a configuration for audio equalization of an input audio signal, and apparatus and computer programs therefore.BACKGROUND OF THE INVENTION[0002]Equalization, or filtering, is used to alter the frequency spectrum of a signal by altering the frequency response of an equalization device through which the signal passes, e.g. by increasing or decreasing the amplitude of the signal over a band of frequencies while leaving the amplitude of the signal at other frequencies largely unchanged. The signal may be a digital audio signal, but it will be appreciated that it may be other types of signal too. The filtering is achieved by processing the input signal such that the output signal from the filter depends upon some constant linear combination of delayed samples of both the input signal and the output signal of the filter. In general the filtering of a signal to p...
Claims
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IPC IPC(8): H04R1/40
CPCH04R27/00H04R2201/401H04R1/403H04S7/307H04R2201/403G10L19/26
Inventor EASTTY, PETER
Owner OXFORD DIGITAL
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