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Method and system for loudness equalization and dynamic equalization during DRC based on encoded audio metadata

A metadata and audio technology, applied in the field of loudness equalization based on encoded audio metadata and dynamic equalization and system during DRC, which can solve problems such as different tonal characteristics

Active Publication Date: 2021-11-26
APPLE INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Content not only sounds louder or softer if different playback levels are used, but may also appear to have different tonal characteristics

Method used

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  • Method and system for loudness equalization and dynamic equalization during DRC based on encoded audio metadata
  • Method and system for loudness equalization and dynamic equalization during DRC based on encoded audio metadata
  • Method and system for loudness equalization and dynamic equalization during DRC based on encoded audio metadata

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Embodiment Construction

[0015] Several embodiments of the invention will now be explained with reference to the accompanying drawings. Whenever the shapes, relative positions, and other aspects of components described in the embodiments are not clearly defined, the scope of the present invention is not limited only to the illustrated components, which are for illustration purposes only. Additionally, while numerous details are set forth, it is understood that some embodiments of the invention may be practiced without these details. In other instances, well-known circuits, structures and techniques have not been shown in detail in order not to obscure the understanding of this description.

[0016] The conventional "loudness" button mechanism presented above in the background section ignores the important issue that the amount of low frequency range loss reported by a listener depends on the acoustic level at that frequency range at the listener, which depends on the audio content. An embodiment of t...

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Abstract

The present invention provides dynamic loudness equalization of received audio content in a playback system using metadata comprising an instantaneous loudness value for the audio content. The playback level is derived from the playback system's user volume setting and compared to the mix level assigned to the audio content. Calculating parameters defining an equalization filter for filtering the filtered audio content before driving the speakers with said audio content, based on the instantaneous loudness value and a comparison of the playback level to the assigned mix level. Other embodiments are also described and claimed.

Description

[0001] This patent application claims the benefit of the earlier filing date of US Provisional Patent Application 62 / 235,293, filed September 30, 2015. technical field [0002] Embodiments of the present invention relate to digital audio signal processing on the playback side of digital video content associated with metadata to improve the listener's experience. Other embodiments are also described. Background technique [0003] Audio content such as movie music or soundtracks are often produced with the assumption of a specific playback level (e.g., the "overall gain" that should be applied to the audio signal during playback, between its original or decoded form and the time it is converted to sound by the speakers). time to obtain the sound pressure level at the same listener position as the audio content producer intended). If different playback levels are used, not only will the content sound louder or softer, but it may also appear to have different tonal characterist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03G7/00
CPCH03G7/007H03G5/165H04R3/04H04R2430/01H04N21/8113H04N21/84G10L19/00G10L19/167G06F3/165
Inventor F·鲍姆加特
Owner APPLE INC
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