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Loudness control with noise detection and loudness drop detection

A technology of noise detection and loudness, which is applied in the direction of amplification control, gain control, and combination of control types, etc., and can solve problems such as inability to effectively control the loudness level

Active Publication Date: 2015-03-25
DTS
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

On the other hand, systems that react slower to loudness changes may not be able to effectively control the loudness level, or may exhibit noticeable artifacts such as ramping during large changes in the input signal loudness level

Method used

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  • Loudness control with noise detection and loudness drop detection
  • Loudness control with noise detection and loudness drop detection
  • Loudness control with noise detection and loudness drop detection

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Embodiment approach

[0165] According to one embodiment, the loudness dip detection system can robustly detect large long-term loudness dips while avoiding detection during loudness fluctuations due to short-term signal dynamics. Figure 8 A block diagram of a loudness dip detection system 800 according to one embodiment is shown. Figure 8 The loudness drop detection system 800 in can receive audio signal x c [n], and may output a time-varying loudness drop detection estimate drop[m], indexed by m, such that drop[m] indicates whether a significant drop in loudness level has occurred. The loudness drop detection estimate drop[m] may for example be defined on the range [0,1], where 0 indicates no loudness drop, 1 indicates that a large loudness drop has just occurred, and values ​​in between are smaller or An indicator of a smoother loudness drop. However, other loudness detection values ​​may be used.

[0166] Loudness dip detection system 800 may include any of the following: short-term loudne...

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Abstract

Loudness control systems or methods may normalize audio signals to a predetermined loudness level. If the audio signal includes moderate background noise, then the background noise may also be normalized to the target loudness level. Noise signals may be detected using content-versus-noise classification, and a loudness control system or method may be adjusted based on the detection of noise. Noise signals may be detected by signal analysis in the frequency domain or in the time domain. Loudness control systems may also produce undesirable audio effects when content shifts from a high overall loudness level to a lower overall loudness level. Such loudness drops may be detected, and the loudness control system may be adjusted to minimize the undesirable effects during the transition between loudness levels.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of U.S. Provisional Application No. 61 / 670,991, filed July 12, 2012, and U.S. Provisional Application No. 61 / 671,005, filed July 12, 2012, which are hereby incorporated by reference , as fully stated. technical field [0003] This application relates to loudness control systems. Background technique [0004] The loudness control system may be designed to generate an output audio signal with a uniform loudness level from input audio signals with different loudness levels. These systems can be used in applications such as audio broadcast chains, and in audio playback devices where multiple content sources of different loudness levels can be used. An example goal of a loudness control system may be to automatically provide an output signal with a uniform average loudness level, eliminating the need for the listener to constantly adjust the volume control on their playback device. [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/20
CPCH03G3/32H03G5/005H03G9/005H03G9/025H03G3/20
Inventor B·史密斯A·沃纳J·汤普森
Owner DTS
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