Sound adjustment method for hearing protection and sound adjustment device performing the same
A sound adjustment method includes the following steps: obtaining a sound signal including frequency bands with a corresponding original sound pressure level value; converting the original sound pressure level value of each frequency band into a corresponding loudness level value; adjusting each loudness level value by a preset loudness level value to obtain an adjusted loudness level value of each frequency band; converting each adjusted loudness level value into a corresponding adjusted sound pressure level value; calculating a target sound pressure level value of each frequency band according to the original sound pressure level of each frequency band and each adjusted sound pressure level value; adjusting the original sound pressure level value of each frequency band by each target sound pressure level value to obtain an adjusted sound signal; outputting the adjusted sound signal.
1. A sound adjustment method, applied to a sound adjustment device and used for adjusting a sound signal, the sound adjustment method comprising the following steps of:
obtaining the sound signal, wherein the sound signal comprises a plurality of frequency bands and each frequency band has a corresponding original sound pressure level value;
converting the original sound pressure level value of each frequency band into a corresponding loudness level value respectively;
adjusting each loudness level value by a preset loudness level value to obtain an adjusted loudness level value of each frequency band;
converting each adjusted loudness level value into a corresponding adjusted sound pressure level value respectively;
calculating a target sound pressure level value of each frequency band according to the original sound pressure level value of each frequency band and each adjusted sound pressure level value;
adjusting the original sound pressure level value of each frequency band by each target sound pressure level value to obtain an adjusted sound signal;
outputting the adjusted sound signal; and
detecting whether a volume and an accumulated playback time of sound previously played by a speaker device exceed a set condition;
wherein the preset loudness level value is determined according to the volume and the accumulated playback time of sound previously played by the speaker device.
2. The sound adjustment method as claimed in claim 1 , wherein the steps of converting the original sound pressure level value of each frequency band into the corresponding loudness level value respectively and converting each adjusted loudness level value into the corresponding adjusted sound pressure level value respectively are performed according to an equal-loudness contour.
3. The sound adjustment method as claimed in claim 1 , further comprising the following step of:
detecting whether a sound adjustment command is received.
4. A sound adjustment device, used for adjusting a sound signal, the sound adjustment device comprising:
an input end, used for obtaining the sound signal, wherein the sound signal comprises a plurality of frequency bands and each frequency band has a corresponding original sound pressure level value;
a processing unit, electrically connected to the input end, the processing unit comprising:
a first conversion module, used for converting the original sound pressure level value of each frequency band into a corresponding loudness level value respectively;
a loudness adjustment module, used for adjusting each loudness level value by a preset loudness level value to obtain an adjusted loudness level value of each frequency band;
a second conversion module, used for converting each adjusted loudness level value into a corresponding adjusted sound pressure level value respectively;
a computing module, used for calculating a target sound pressure level value of each frequency band according to the original sound pressure level value of each frequency band and each adjusted sound pressure level value; and
a sound intensity adjustment module, used for adjusting the original sound pressure level value of each frequency band by each target sound pressure level value to obtain an adjusted sound signal;
an output end, electrically connected to the processing unit, for outputting the adjusted sound signal; and
a detection module, used for detecting whether a volume and an accumulated playback time of sound previously played by a speaker device exceed a set condition;
wherein the preset loudness level is determined according to the volume and the accumulated playback time of the sound previously played by the speaker device.
5. The sound adjustment device as claimed in claim 4 , wherein the first conversion module converts the original sound pressure level value of each frequency band into the corresponding loudness level value respectively according to an equal-loudness contour and the second conversion module converts each adjusted loudness level value into the corresponding adjusted sound pressure level value respectively according to the equal-loudness contour.
6. The sound adjustment device as claimed in claim 4 , wherein said detection module is used for detecting whether a sound adjustment command is received.