CN112019973B - Sound adjustment method and sound adjustment device implementing the method - Google Patents

Abstract

A sound adjustment method and a sound adjustment device for executing the method, the sound adjustment method includes the following steps: obtaining a sound signal, wherein the sound signal includes a plurality of frequency bands, each frequency band has a corresponding original sound pressure level value; The pressure level value is respectively converted into the corresponding loudness level value; each loudness level value is adjusted to a preset loudness level value to obtain the adjusted loudness level value of each frequency band; each adjusted loudness level value is respectively converted into the corresponding adjusted loudness level value Sound pressure level value; According to the original sound pressure level value of each frequency band and the adjusted sound pressure level value, the target sound pressure level value of each frequency band is calculated and obtained; the original sound pressure level value of each frequency band is used to adjust each target sound pressure level. value to obtain an adjustment sound signal; output the adjustment sound signal.

Description

Sound adjustment method and sound adjustment device implementing the method

technical field

The present invention relates to a sound adjustment method and a sound adjustment device implementing the method, in particular to a sound adjustment method capable of automatically adjusting the sound pressure level value according to the adjustment of the loudness level value, and a sound adjustment device implementing the method.

Background technique

Nowadays, people often use headphones to listen to music in order to achieve a better hearing effect. However, the earphone has a great influence on the hearing of the user, and if the volume is continuously too high, it is easy to cause damage to the hearing. Therefore, a method for automatically controlling the volume has been developed. However, the current automatic control of the headphone volume directly adjusts the sound pressure level of the sound in the same way, but the sound pressure level does not represent the actual hearing experience of the user. In line with the user's actual hearing conditions.

Therefore, it is necessary to invent a new sound adjustment device with hearing protection function and a sound adjustment method thereof to solve the deficiencies of the prior art.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to provide a sound adjustment method for automatically adjusting the sound pressure level by adjusting the loudness level.

Another main object of the present invention is to provide a sound adjustment device for implementing the above method.

In order to achieve the above-mentioned object, the sound adjustment method of the present invention is used in a sound adjustment device to adjust the sound signal. The sound adjustment method of the present invention comprises the following steps: obtaining a sound signal, wherein the sound signal includes a plurality of frequency bands, and each frequency band has a corresponding original sound pressure level value; and converting the original sound pressure level value of each frequency band into a corresponding loudness level value respectively ; Adjust each loudness level value to a preset loudness level value to obtain the adjusted loudness level value of each frequency band; convert each adjusted loudness level value into the corresponding adjusted sound pressure level value; The sound pressure level value and each adjusted sound pressure level value are calculated to obtain the target sound pressure level value of each frequency band; the original sound pressure level value of each frequency band is adjusted to each target sound pressure level value to obtain an adjusted sound signal; output the Adjust the sound signal.

The sound adjusting device of the present invention is used for adjusting the sound signal, and includes an input end, a processing unit and an output end. The input end is used to obtain a sound signal, wherein the sound signal includes a plurality of frequency bands, and each frequency band has a corresponding original sound pressure level value. The processing unit is electrically connected with the input end, and the processing unit includes a first conversion module, a loudness adjustment module, a second conversion module, a calculation module and a sound intensity adjustment module. The first conversion module is used for converting the original sound pressure level values of each frequency band into corresponding loudness level values respectively. The loudness adjustment module is used for adjusting each loudness level value to a preset loudness level value, so as to obtain the adjusted loudness level value of each frequency band. The second conversion module is used for converting each adjusted loudness level value into a corresponding adjusted sound pressure level value. The calculation module is used for calculating and obtaining the 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. The sound intensity adjustment module is used for adjusting the original sound pressure level value of each frequency band to adjust each target sound pressure level value, so as to obtain an adjusted sound signal. The output end is electrically connected to the processing unit, and the output end is used for outputting the adjusted sound signal.

The present invention is described in detail below with reference to the accompanying drawings and specific embodiments, but is not intended to limit the present invention.

Description of drawings

1 is a device architecture diagram of an embodiment of the sound adjustment device of the present invention;

2 is a flow chart of steps of an embodiment of the sound adjustment method of the present invention;

Fig. 3 shows the volume schematic diagram of different frequency bands of the sound signal;

FIG. 4 is a schematic diagram showing the conversion between sound pressure level values and loudness level values.

where the reference number

Sound adjustment device 1 Input 10

Processing unit 20 Detection module 21

First conversion module 22 Loudness adjustment module 23

second conversion module 24 calculation module 25

Sound intensity adjustment module 26 Output end 30

Adjust sound signal 80 Sound signal 90

Sound generating device 100 Speaker device 200

Detailed ways

In order to better understand the technical content of the present invention, preferred specific embodiments are given and described as follows.

In the following, please refer to FIG. 1 which is an apparatus structure diagram of an embodiment of the sound adjustment apparatus of the present invention.

As shown in FIG. 1 , the sound adjusting device 1 of the present invention has the function of hearing protection, and is used to adjust the sound volume and the accumulated time of the sound played by a speaker device 200 reach a set condition, to adjust the sound generated by a sound generating device 100 The sound pressure level value of the sound signal, and the speaker device 200 emits sound according to the sound pressure level value adjusted sound signal, so as to avoid hearing damage of the user. Besides, the sound adjustment device 1 of the present invention can also adjust the sound pressure level value of the sound signal according to the sound adjustment command input by the user. In a specific embodiment, the sound generating device 100 may be a device capable of generating sound signals, such as a stereo, a television or a mobile phone, and the speaker device 200 may be an earphone or a speaker, but the invention is not limited to the above-mentioned devices. In addition, in the specific embodiment, the sound adjustment device 1 can be a microprocessor chip, which is disposed on the sound generating device 100 and is connected and communicated with the speaker device 200 in a wired or wireless manner, but this is not the case in the present invention limit. In other embodiments, the sound adjustment device 1 can also be disposed on the speaker device 200 to communicate with the sound generation device 100 in a wired or wireless manner.

As shown in FIG. 1 , in an embodiment of the present invention, the sound adjustment device 1 includes an input end 10 , a processing unit 20 and an output end 30 .

In an embodiment of the present invention, the input terminal 10 is connected and communicated with the sound generating device 100 to obtain the sound signal 90 generated by the sound generating device 100 . The sound signal 90 includes a plurality of frequency bands, and each of the different frequency bands has its own original sound pressure level value.

In an embodiment of the present invention, the processing unit 20 is electrically connected to the input terminal 10 . The processing unit 20 includes a detection module 21 , a first conversion module 22 , a loudness adjustment module 23 , a second conversion module 24 , a calculation module 25 and a sound intensity adjustment module 26 . It should be noted that the above modules can be configured as hardware devices, software programs, firmware or their combinations, but also by circuit loops or other suitable types; and each module can be configured in a separate type, and can also be combined. Type configuration. In a preferred embodiment, each module is a software program stored in a storage unit (not shown), and each module is executed by the processing unit 20 to achieve the functions of the present invention. In addition, this embodiment only illustrates a preferred embodiment of the present invention, and to avoid repetition, all possible variations and combinations are not described in detail. However, those skilled in the art should understand that the above modules or elements are not necessarily all necessary. In order to implement the present invention, other more detailed existing modules or elements may also be included. Each module or element may be omitted or modified as required, and there may not be other modules or elements between any two modules.

In an embodiment of the present invention, the detection module 21 is used to detect whether the volume and accumulated time of the sound played by the speaker device 200 previously exceed a set condition, or whether a sound adjustment command is received. When the detection module 21 detects that the volume and accumulated time of the sound previously played by the speaker device 200 have exceeded the set condition, for example, when the time that the speaker device 200 previously played the sound of 85-87 decibels has accumulated for 288 seconds, or receives a When the user inputs the sound adjustment instruction through the input interface, the processing unit 20 will start to adjust the sound pressure level value of the received sound signal 90 in the following manner.

In an embodiment of the present invention, the first conversion module 22 converts the original sound pressure level values of each frequency band of the sound signal 90 into corresponding loudness level values according to equal-loudness contours. The so-called "Sound Pressure Level (SPL)" is an objective physical quantity that expresses the intensity of sound, and the unit is decibel (dB). The "loudness level" is a subjective psychological quantity that expresses the intensity of the sound, and the unit is phons. In a specific embodiment, the sound adjustment device 1 may store a standard equal-loudness curve, such as a Fletcher-Monsen curve, in advance, but it is not limited thereto.

In an embodiment of the present invention, the loudness adjustment module 23 is configured to adjust each of the loudness level values by a preset loudness level value, so as to obtain the adjusted loudness level value of each frequency band of the sound signal 90 . In a specific embodiment, if the adjustment is performed according to the volume and accumulation time of the sound previously played by the speaker device 200 exceeding the set condition, the preset loudness level value is based on the volume and accumulation time of the sound previously played by the speaker device 200 to decide. The relationship between the preset loudness level value and the volume and accumulation time of the sound previously played by the speaker device 200 will be described in more detail below, and will not be repeated here for the time being. In addition, if the adjustment is performed according to the received sound adjustment instruction, the preset loudness level value is a preset fixed value, such as 15 phons.

In an embodiment of the present invention, the second conversion module 24 is configured to convert each of the adjusted loudness level values into a corresponding adjusted sound pressure level value, respectively. Similarly, the conversion between the adjusted loudness level value and the adjusted sound pressure level value here is also performed according to the aforementioned equal-loudness curve, but is not limited thereto.

In an embodiment of the present invention, the calculation module 25 is configured to calculate and obtain the target sound pressure level of each frequency band of the sound signal 90 according to the original sound pressure level value and each adjusted sound pressure level value of each frequency band of the sound signal 90 . value. For example, assuming that the original sound pressure level of the sound signal 90 in the 1000 Hz frequency band is 90 decibels, and the adjusted sound pressure level of the sound signal 90 in the 1000 Hz frequency band is 75 decibels, the calculation module 25 will use the adjusted sound pressure level. The sound pressure level value of 75 dB is subtracted from the original sound pressure level value of 90 dB to obtain the target sound pressure level value of -15 dB.

In an embodiment of the present invention, the sound intensity adjustment module 26 is used for adjusting the target sound pressure level with the original sound pressure level of each frequency band of the sound signal 90 to obtain an adjusted sound signal 80 . For example, assuming that the original sound pressure level value of the sound signal 90 in the 1000 Hz frequency band is 90 dB, and the target sound pressure level value obtained by calculation is -15 dB, then adjust the sound pressure level value of the sound signal 80 in the 1000 Hz frequency band. is 75 decibels, which is equal to the original sound pressure level of 90 decibels plus the target sound pressure level of -15 decibels.

In an embodiment of the present invention, the output end 30 is electrically connected to the processing unit 20 and communicates with the speaker device 200 in a wired or wireless manner. The output terminal 30 is used for outputting the adjusted sound signal 80 .

Next, please refer to FIG. 1 to FIG. 4 together, in which FIG. 2 is a flow chart of the steps of an embodiment of the sound adjustment method of the present invention. each step. It should be noted here that although the above-mentioned sound adjustment device 1 is used as an example to describe the sound adjustment method of the present invention, the sound adjustment method of the present invention is not limited to the sound adjustment device 1 having the same structure as described above.

First, step S1 is performed: the audio signal is acquired.

The input end 10 is connected to the sound generating device 100 by wire or wirelessly, so as to obtain the sound signal 90 generated by the sound generating device 100 . The sound signal 90 includes multiple frequency bands, and each frequency band has a corresponding original sound pressure level value. Taking the example shown in Figure 3, the multiple frequency bands can include three frequency bands: 100 Hz, 1000 Hz and 10000 Hz. The original sound pressure level of the 100 Hz band is 100 dB, and the original sound pressure level of the 1000 Hz band is 90. The original sound pressure level value of the 10000 Hz frequency band is 80 decibels, but the present invention is not limited to this.

Go to step S2: Detect whether the volume and accumulated time of the sound played by the speaker device previously exceed the set condition, or whether a sound adjustment instruction is received.

The detection module 21 of the processing unit 20 detects whether the volume and accumulated time of the sound previously played by the speaker device 200 exceed the set conditions, or detects whether a sound adjustment command input by the user is received. If the volume and accumulated time of the sound previously played by the speaker device 200 do not exceed the set conditions and the processing unit 20 has not received the sound adjustment instruction, the sound signal will not be adjusted, and the sound signal 90 will be output directly (ie, step S9 is executed). . When the detection module 21 detects that the volume and accumulated time of the sound previously played by the speaker device 200 have exceeded the set condition, for example, when the time that the speaker device 200 previously played the sound of 85-87 decibels has accumulated for 288 seconds, or receives a When the user inputs a sound adjustment instruction through the input interface, the processing unit 20 will start to adjust the sound pressure level value of the sound signal 90 in the manner of the following steps S3 to S7. That is to say, the sound adjustment method of the present invention can be applied to the volume reduction performed to protect the user's hearing, or the user's autonomous control to increase or decrease the playback volume.

Go to step S3: Convert the original sound pressure level values of each frequency band of the sound signal into corresponding loudness level values respectively.

When it is detected that the volume and accumulated time of the sound previously played by the speaker device 200 exceed the set conditions, or a sound adjustment command is detected, the first conversion module 22 will convert the sound signal according to equal-loudness contours The original sound pressure level values of each frequency band of 90 are respectively converted into corresponding loudness level values. The loudness curves can be, for example, Fletcher-Monsen curves, which can be stored in the sound adjustment device 1 in advance. Taking the previous example as an example, as shown in Figure 4, the original sound pressure level value of the 100 Hz frequency band is 100 decibels, which is converted into a corresponding loudness level value of 91 (phons), and the original sound pressure level value of the 1000 Hz frequency band is 90. The decibel is converted into the corresponding loudness level value of 90 (phons), and the original sound pressure level value of the 10000 Hz frequency band is 80 decibels, which is converted into the corresponding loudness level value of 67 (phons).

Go to step S4 : adjust each loudness level value to a preset loudness level value to obtain the adjusted loudness level value of each frequency band of the sound signal.

After step S3 is completed, the loudness adjustment module 23 then adjusts each loudness level value converted in step S3 to a preset loudness level value to obtain the adjusted loudness level value of each frequency band of the sound signal 90 . Taking Figure 4 as an example, the preset loudness level is -15 (phons), therefore, the adjusted loudness level of the 100 Hz band is 76 (phons), and the adjusted loudness level of the 1000 Hz band is 75 (phons). ), the adjusted loudness level for the 10000 Hz band is 52 (phons). It should be noted that, in the specific embodiment, if the adjustment is performed according to the volume of the sound played by the speaker device 200 previously and the accumulated time exceeds the set condition, the preset loudness level value of the present invention may be based on the previous volume of the speaker device 200. The volume and accumulation time of the playing sound are determined, and are not unique values. The specific corresponding relationship between the preset loudness level value and the volume and accumulation time of the previously played sound of the speaker device 200 can be shown in the following table, but is not limited thereto.

It can be seen from the above table that, in the example given, it is assumed that the loudness adjustment module 23 will reduce the loudness level value by 5 (phons) when the time that the speaker device 200 has previously played the sound of 85-87 decibels has accumulated for 288 seconds (that is, The preset loudness level is -5 (phons); when the loudspeaker device 200 has previously played a sound of 85-87 decibels for 504 seconds, the loudness adjustment module 23 will decrease the loudness level by 15 (phons). (That is, the preset loudness level value is -15 (phons)). Furthermore, when the time that the speaker device 200 previously played the sound of 94 to 96 decibels has accumulated for 63 seconds, the loudness adjustment module 23 will also reduce the loudness level value by 15 (phons) (that is, the preset loudness level value is -15 (phons). )). In addition, if the adjustment is performed according to the received sound adjustment instruction, the preset loudness level value is a preset fixed value. For example, assuming that the loudness level of the 100 Hz frequency band is 91 (phons), if the sound adjustment command input by the user is a volume up command, the loudness adjustment module 23 will increase the loudness level by 15 (phons) value (that is, the preset loudness level value is 15 (phons)), to obtain the adjusted loudness level value of this frequency band is 106 (phons).

Go to step S5 : convert each adjusted loudness level value into a corresponding adjusted sound pressure level value.

After step S4 is completed, the second conversion module 24 will convert each adjusted loudness level value into a corresponding adjusted sound pressure level value according to the equal loudness curve. Taking Figure 4 as an example, the adjusted loudness level value of the 100 Hz frequency band is 76 (phons), which is converted into a corresponding adjusted sound pressure level value of 90 decibels; the adjusted loudness level value of the 1000 Hz frequency band is 75 (phons). ), which is converted into a corresponding adjusted sound pressure level of 75 decibels; the adjusted loudness level of 10,000 Hz frequency band is 52 (phons), which is converted into a corresponding adjusted sound pressure level of 66 decibels.

Go to step S6: Calculate and obtain the 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.

After obtaining the adjusted sound pressure level value, the calculation module 25 then calculates and obtains the target sound pressure level value of each frequency band according to the original sound pressure level value of each frequency band and the adjusted sound pressure level value. Taking the previous example as an example, the original sound pressure level in the 100 Hz frequency band is 100 decibels, and the adjusted sound pressure level is 90 decibels, then the calculation module 25 will use the difference between 90 decibels and 100 decibels -10 decibels as the target sound pressure The level value, that is, the target sound pressure level value is equal to the adjusted sound pressure level value minus the original sound pressure level value; the original sound pressure level value of the 1000 Hz frequency band is 90 decibels, and the adjusted sound pressure level value is 75 decibels. The target sound pressure level value is -15 decibels; the original sound pressure level value of the 10000 Hz frequency band is 80 decibels, the adjusted sound pressure level value is 66 decibels, and the obtained target sound pressure level value is -14 decibels.

Go to step S7: adjust the original sound pressure level value of each frequency band to each target sound pressure level value, so as to obtain an adjusted sound signal.

After obtaining the target sound pressure level value, the sound intensity adjustment module 26 adds the original sound pressure level value of each frequency band to the target sound pressure level value to be adjusted in each frequency band to obtain the adjusted sound signal 80 . Taking the above example as an example, the adjusted sound signal 80 includes a 100 Hz frequency band, a 1000 Hz frequency band and a 10000 Hz frequency band, and the sound pressure levels of the frequency bands are respectively 90 dB, 75 dB and 66 dB in sequence.

Finally, step S8 is performed: the adjustment sound signal is output.

The final output terminal 14 is used for outputting the adjusted sound signal 80 to the speaker device 200 .

It can be seen from the foregoing description that the sound adjustment device 1 of the present invention can adjust the sound pressure level values of different frequency bands of the sound respectively, so as to achieve a better hearing protection effect, and since the basis of the adjustment is to convert according to the reduced loudness level value. come, so you can

It should be noted that the above-mentioned embodiments merely illustrate the preferred embodiments of the present invention, and to avoid repetition, all possible variations and combinations are not described in detail. However, those skilled in the art should understand that the above modules or elements are not necessarily all necessary. In order to implement the present invention, other more detailed existing modules or elements may also be included. Each module or element may be omitted or modified as required, and there may not be other modules or elements between any two modules.

Of course, the present invention can also have other various embodiments, without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding Changes and deformations should belong to the protection scope of the appended claims of the present invention.

Claims (4)

1. A sound adjustment method for a sound adjustment device to adjust a sound signal, wherein the method comprises the steps of: obtaining the sound signal, the sound signal comprising a plurality of frequency bands, each of the frequency bands having an original sound pressure level value; Convert the original sound pressure level value of each frequency band into a corresponding loudness level value; adjusting each of the loudness level values to a preset loudness level value to obtain an adjusted loudness level value for each of the frequency bands; converting each adjusted loudness level value into a corresponding adjusted sound pressure level value; According to the original sound pressure level value of each frequency band and the adjusted sound pressure level value, obtain a target sound pressure level value of each frequency band; adjusting the target sound pressure level values from the original sound pressure level values of the frequency bands to obtain an adjusted sound signal; outputting the adjusted sound signal; and Detecting whether the volume and accumulated time of the sound previously played by a speaker device exceed a set condition, The preset loudness level value is determined according to the volume of the sound previously played by the speaker device and the accumulated time. Under the condition that the volume of the sound played is the same, when the accumulated time is longer, the reduction degree of the target sound pressure level value is increased. , and the larger the sound volume, the shorter the accumulation time will achieve the same reduction degree of the target sound pressure level value. 2 . The method according to claim 1 , wherein the original sound pressure level values of each frequency band are respectively converted into the corresponding loudness level values and the adjusted loudness level values are respectively converted into the corresponding adjusted loudness level values. 3 . The rear sound pressure level value is converted according to the first class loudness curve. 3. A sound adjustment device for adjusting a sound signal, wherein the sound adjustment device comprises: an input terminal for obtaining the sound signal, the sound signal includes a plurality of frequency bands, and each of the frequency bands has an original sound pressure level value; a processing unit electrically connected to the input end, the processing unit comprising: a first conversion module, for converting the original sound pressure level value of each frequency band into a corresponding loudness level value; a loudness adjustment module for adjusting each of the loudness level values to a preset loudness level value to obtain an adjusted loudness level value for each of the frequency bands; a second conversion module for converting each adjusted loudness level value into a corresponding adjusted sound pressure level value; a calculation module for obtaining a target sound pressure level of each frequency band according to the original sound pressure level value of each frequency band and each of the adjusted sound pressure level values; and The sound intensity adjustment module is used for adjusting the target sound pressure level values of the original sound pressure level values of the frequency bands to obtain an adjusted sound signal; an output terminal electrically connected to the processing unit for outputting the adjusted sound signal; and a detection module for detecting whether the volume and accumulated time of the sound previously played by a speaker device exceed a set condition; The preset loudness level value is determined according to the volume of the sound previously played by the speaker device and the accumulated time. Under the condition that the volume of the sound played is the same, when the accumulated time is longer, the reduction degree of the target sound pressure level value is increased. , and the larger the sound volume, the shorter the accumulation time will achieve the same reduction degree of the target sound pressure level value. 4 . The sound adjustment device according to claim 3 , wherein the first conversion module converts the original sound pressure level value of each frequency band into the corresponding loudness level value according to the first-order loudness curve; The second conversion module converts each of the adjusted loudness level values into corresponding adjusted sound pressure level values according to the loudness curves.

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