Multiband compressor

a compressor and multi-band technology, applied in the field of multi-band compressors, can solve the problems of loss of sound balance, change of sound characteristics, unpleasant output sound, etc., and achieve the effect of enhancing sound level and high level

Inactive Publication Date: 2014-12-25
LENOVO INNOVATIONS LTD HONG KONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

Achieves balanced sound quality and effective sound level enhancement by limiting gain values across bands, minimizing sound quality changes and ensuring balanced compression.

Problems solved by technology

(1) In the case where the fundamental frequency and the harmonic component of the input signal are divided separately to different bands, only the fundamental frequency having relatively high level is compressed, resulting in loss of balance of the sound (change of characteristics of the sound).
(2) The effect of enhancing the sound level varies depending on frequency bands, possibly causing a case where only the high-frequency band or low-frequency band is enhanced, resulting in the unpleasant output sound. This is particularly prominent when only the high frequency band is enhanced.
These problems result from the intrinsic characters of the multiband compressor, and is in the relationship of trade-off with the effect of enhancing the sound level.

Method used

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Embodiment Construction

[0022]Hereinbelow, an exemplary embodiment of the present invention will be described with reference to FIG. 1 to FIG. 3. A multiband compressor 100 according to this exemplary embodiment divides an audio signal by frequency bands, subjects the divided audio signals to a dynamics compression process for each of the frequency bands, synthesizes the subjected signals, and outputs the synthesized signal.

[0023]The multiband compressor 100 according to this exemplary embodiment has a level calculation unit 121 that calculates a signal level inputted for each of the frequency bands, a gain calculation unit 122 that calculates a gain value from the calculated signal level, and an interband limiter 130 serving as a gain limitation unit that limits a gain value by comparison with a gain value of the other band in a compressor provided for each of the bands.

[0024]More specifically, as illustrated in FIG. 1, in the multiband compressor 100 according to this exemplary embodiment, plural compres...

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Abstract

In a multiband compressor 100, a level calculation unit 121 calculates a signal level inputted for each of bands, a gain calculation unit 122 calculates a gain value from the calculated signal level, and a gain limitation unit 130 limits a gain value by comparison with a gain value of the other band in a compressor for each band. With this configuration, provided is a multiband compressor capable of achieving a balance between the quality of sound and the effect of enhancing the sound level at a high level.

Description

TECHNICAL FIELD[0001]The present invention relates to a multiband compressor that splits an audio signal by frequency bands, subjects each of the split audio signals to a dynamics compression process for each of the frequency bands, synthesizes the subjected audio signals, and outputs the synthesized audio signal.BACKGROUND ART[0002]FIG. 4 illustrates a configuration of a typical multiband compressor. The multiband compressor provides a sound process of splitting an inputted audio signal with a band splitting filter (also referred to as isolator) by frequency bands, applying a compressor process for each of the split frequency bands, synthesizing the split audio signals, and outputting the synthesized audio signal.[0003]The compressor process provides a function of measuring levels of an inputted signal, subjecting the inputted signal to a weighting process in accordance with a sound level curve as illustrated in FIG. 5, and outputting the subjected signals. A boundary level of an i...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): G10L19/26
CPCG10L19/265H03G9/025H04R25/356H04R2430/03
InventorHOSOKAWSA, SATOSHI
OwnerLENOVO INNOVATIONS LTD HONG KONG