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Loudness of normalizing sound recording

A loudness, digital audio technology, applied in the field of audio playback, can solve the problem of different playback loudness

Inactive Publication Date: 2008-01-02
SONY ERICSSON MOBILE COMM AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In such systems, the perceived playback loudness varies from message to message for the same playback volume setting due to differences in the characteristic loudness of individual stored messages

Method used

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  • Loudness of normalizing sound recording
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  • Loudness of normalizing sound recording

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Embodiment Construction

[0023] Before turning to the drawings, it may be helpful to organize the invention in terms of its underlying gain compensation process. The present invention provides a method and apparatus whereby one or more stored recordings are processed to determine their loudness. Based on the loudness of the recording, a gain compensation parameter is determined for each such processed recording and stored. When a given recording is selected for playback, the corresponding Gain Compensation parameter is used to fix the playback gain used to play the recording, which normalizes the playback loudness of the recording. That is, by compensating the playback gain for each recording according to the recording's corresponding gain compensation parameter, the playback loudness of two different recordings whose recordings are very different in loudness can become substantially the same.

[0024] With the above approach in mind, FIG. 1 functionally illustrates at least part of an audio processi...

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Abstract

A method and apparatus normalizes the playback loudness of stored sound recordings to avoid objectionable variations in perceived loudness between different sound recordings at the same volume setting. In an exemplary processing method, a stored sound recording is processed to determine its loudness. That loudness, or some value derived from it, is then used to set the playback gain used for playing back the sound recording. Thus, for a given volume setting, the playback gain can be set lower for louder recordings, and higher for quieter recordings. In one or more exemplary embodiments, sound recordings are processed as received, or at least some time in advance of their first playback, so that a loudness-based gain compensation parameter can be calculated and stored for them. The corresponding stored gain control parameter can then be selected and used responsive to selecting a particular sound recording for playback.

Description

technical field [0001] The present invention relates generally to audio playback, and in particular to compensating for playback gain of individual recordings based on recording loudness. Background technique [0002] The loudness of a given recording affects its perceived playback loudness. As a result, listeners may perceive one recording as louder or quieter than another for the same playback volume setting. These resulting differences in playback loudness may be particularly problematic in certain environments. [0003] For example, it is now common for cellular handset users to download custom ring tones to their handsets. With the rapid proliferation of customized ringtones, mobile phone users can change the ringtone to suit their changing likes and dislikes, and can assign different ringtones to different callers. However, the characteristic loudness of different ringtone files can vary greatly, which can cause undesired variations in the perceived ringer loudness ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B20/10H04M19/04H04M3/533H03G3/30G10L19/00G10L21/034G10L21/0364
CPCH04M3/40H04M1/6016G11B20/10527H04M1/652H04M1/7253H04M3/533H04M1/7255H03G3/002H04M1/72433H04M1/72412
Inventor E·D·罗姆斯伯格W·C·伊顿
Owner SONY ERICSSON MOBILE COMM AB
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