Calculating and adjusting the perceived loudness and/or the perceived spectral balance of an audio signal

A technology of audio signal and audio spectrum, used in pitch control, digital/coded signal combination control, speech analysis, etc.

Inactive Publication Date: 2009-04-29
DOLBY LAB LICENSING CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional passive loudness controls do not ap

Method used

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  • Calculating and adjusting the perceived loudness and/or the perceived spectral balance of an audio signal
  • Calculating and adjusting the perceived loudness and/or the perceived spectral balance of an audio signal
  • Calculating and adjusting the perceived loudness and/or the perceived spectral balance of an audio signal

Examples

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Embodiment Construction

[0082] Figures 1 to 4 is a functional block diagram illustrating examples of possible feedforward, feedback, and hybrid feedforward / feedback implementations of both versions in accordance with aspects of the invention.

[0083] refer to figure 1 In the example of a feed-forward topology, the audio signal is applied to two paths: (1) the signal path with a process or device 2 (“modified audio signal”) capable of modifying the audio signal in response to a modification parameter, and (2) the signal path with Control path of a process or device 4 capable of generating correction parameters ("generating correction parameters"). figure 1 The sum in the feed-forward topology example Figure 2-4 The modified audio signal 2 in each of the examples may be a device or process that generates a modified parameter 4 according to (or respectively from Figure 2-4 The modification parameter M received by the corresponding process or device 4', 4" and 4"') in each of the examples modifi...

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Abstract

Audio signal processing relating to the measurement and control of the perceived sound loudness and/or the perceived spectral balance of an audio signal is useful, for example, in one or more of: loudness-compensating volume control, automatic gain control, dynamic range control (including, for example, limiters, compressors, expanders, etc.), dynamic equalization, and compensating for background noise interference in an audio playback environment. In various embodiments, modification parameters are derived for modifying the audio signal in order to reduce the difference between its specific loudness and a target specific loudness.

Description

technical field [0001] The present invention relates to audio signal processing. More specifically, the present invention relates to the metering and control of the perceived loudness and / or the perceived spectral balance of an audio signal. The present invention may be used, for example, in one or more of loudness compensated volume control, automatic gain control, dynamic range control (including, for example, limiters, compressors, expanders, etc.), dynamic equalization, and compensating for noise in an audio playback environment. Background noise distraction. The present invention includes not only methods, but also corresponding computer programs and devices. Background technique [0002] There have been many attempts to develop satisfactory objective loudness measurements. Fletcher and Munson determined in 1933 that human hearing is duller at low and high frequencies than at intermediate (or speech) frequencies. They also found that the relative change in sensitivi...

Claims

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Application Information

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IPC IPC(8): G10L21/02G10L19/00H03G3/32H03G9/02H04R25/00G10L21/00G10L21/0264G10L21/06G10L25/69
CPCG10L2021/065G10L21/0264G10L21/0205H03G9/005H03G5/165G10L25/69G10L21/0364
Inventor 阿兰·杰弗里·西费尔特
Owner DOLBY LAB LICENSING CORP
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