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Audio dosage control

Through the combination of fast Fourier transform and finite impulse response filter, the problem of sound quality reduction and hearing damage in the existing audio supply volume control system is solved, more accurate frequency attenuation and sound protection are achieved, and the audio supply volume of the system is improved. control effect.

Inactive Publication Date: 2009-02-11
BEAUMONT FREIDMAN CO
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Further, since the attenuation factor is determined by the peak value within the frequency band, the actual applied attenuation may be more or less than ideally required, again tending to unnecessarily degrade the overall sound quality

Method used

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Examples

Experimental program
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Embodiment Construction

[0045] Governments and regulatory agencies such as the Occupational, Safety and Health Act (OSHA) have published recommended noise exposure limits. An OSHA table is shown in Figure 1, which plots frequency horizontally in hertz (Hz) on a logarithmic scale, and relatively plots volume on the left-hand vertical axis in decibels (dB); and, For each frequency and volume combination, mark the recommended maximum exposure time in minutes on the right-hand vertical axis.

[0046] Lower frequency values, towards the left of the graph, represent lower pitch sounds; while higher frequency values, that is, higher pitches, towards the right. For example, the floor vibration is about 20 Hz, and the guitar sound and voice will be as high as about 1000 Hz. Frequencies above 10,000 Hz will sound like squeels. The amplitude or loudness scale changes from 30dB (SPL) for whispers, through daily conversations at about 45dB (SPL), and through shouts at about 80dB (SPL) to a higher level of human toler...

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PUM

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Abstract

A method for controlling consumer exposure to audio dosage for a composite audio signal, the method comprising: sampling the composite audio signal; transforming the sampled audio signal, using a fast fourier transform algorithm, to produce a signal representative of the amplitude of component frequencies of the audio signal; comparing the transformed audio signal with a predefined impulse control threshold profile, representing the target maximum amplitude for each frequency component for the audio signal threshold profile to produce a configuring signal representative of the difference between the broadcast signal and the profile; using the configuring signal to automatically configure in real time a Finite Impulse Response (FIR) filter so that it attenuates the amplitude of the transformed audio signal in frequency bands centred on the frequencies at which the target threshold is exceeded; and outputting the attenuated audio signal for consumer exposure.

Description

Technical field [0001] The present invention relates to audio dosage control, which is used to control, for example, the audio output of speakers at public concerts or the audio fed to headphones in personal music players. [0002] background [0003] Performers at public concerts usually use a high-power amplification system, where the high-power amplification system outputs a very high noise level. This may cause damage to the hearing of the members of the audience, as well as damage the work ability of the sound engineer and other personnel who regularly attend such concerts. Hearing impairment includes loss of sensitivity at specific frequencies or broadly across the entire sound audio spectrum (20 Hz to 20,000 Hz), or hearing disabilities such as tinnitus. Often, this damage is not noticed by the victim at the time and will cause further damage, because the victim will then listen to an audio signal with increased volume to compensate for the hearing loss already suffered. Th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G5/16G10L21/02H03G3/32H04R5/04
CPCH04R5/04H03G3/32H03G5/165G10L21/02
Owner BEAUMONT FREIDMAN CO
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