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The three elements of waterproof Bluetooth speaker sound are: pitch, timbre, and loudness. Any complex waterproof Bluetooth speaker sound can be described by these three attributes, which correspond to the three physical quantities of waterproof Bluetooth speaker sound pressure: frequency, phase, and amplitude.
Pitch: The human ear's perception of high and low waterproof Bluetooth speaker sound is called pitch.
The pitch is mainly related to the frequency of the waterproof Bluetooth speaker sound, while the amateur waterproof Bluetooth speaker sound pressure level is related to the duration of the waterproof Bluetooth speaker sound. The pitch will increase as the frequency increases, but it is not completely linear with the frequency.
It should be noted that the factors that affect the pitch are the waterproof Bluetooth speaker sound pressure level and the duration of the waterproof Bluetooth speaker sound. For low-frequency pure tones, when the waterproof Bluetooth speaker sound pressure level is high, the pitch becomes lower than when the waterproof Bluetooth speaker sound pressure level is low; for pure tones with a frequency between 1KHz and 5KHz, the pitch is almost independent of the waterproof Bluetooth speaker sound pressure level; for a pure tone with a higher frequency, the waterproof Bluetooth speaker sound When the pressure level increases, you will feel the pitch becoming higher.
When the waterproof Bluetooth speaker sound duration is less than 0.5s, the pitch is lower than that of 1s or more. No matter how short the duration is, about 10ms, the listener will not be able to perceive its tone, and can only hear the "kaka" sound.
The duration of the waterproof Bluetooth speaker sound necessary for the human ear to clearly perceive the pitch varies with the frequency of the waterproof Bluetooth speaker sound. Low-frequency sounds take longer than high-frequency sounds.
Tone: Tone refers to people's sense of superiority in distinguishing two sounds with the same loudness and pitch.
Everyone has their own unique timbre, and when different instruments are played, people can also distinguish their respective timbres.
Therefore, timbre is mainly determined by the frequency spectrum of the waterproof Bluetooth speaker sound. But it should be paid special attention that the tone color is also related to the intensity, duration and time course of the waterproof Bluetooth speaker sound.
Loudness: The human ear's perception of the strength of a waterproof Bluetooth speaker sound is called loudness.
The loudness of the waterproof Bluetooth speaker sound is mainly related to the sound pressure. The greater the waterproof Bluetooth speaker sound pressure, the greater the loudness. However, loudness and sound pressure are not linearly proportional, but roughly proportional to the sound pressure index, which is about 0.23. This auditory characteristic of loudness is called "Steven's Index Law".
In addition, loudness is also related to frequency, waveform, and waterproof Bluetooth speaker sound duration.
1. The frequency characteristics of loudness.
Need to pay special attention to, the human ear has different perceptions of the loudness of sounds of different frequencies. In other words, for sounds with different frequencies but the same intensity, the human ear will perceive different loudness. To illustrate the perception of loudness by the human ear, the loudness level is defined. Loudness level is used to indicate the magnitude of loudness, its unit is "phon" and the symbol is LN. It is defined that the loudness level of a waterproof Bluetooth speaker sound is numerically equal to the sound pressure level of the same loud 1KHz pure tone.
Therefore, people usually use equal loudness curves to express the characteristics of pure tone sound pressure level with the same loudness level as a function of frequency. It can be seen that under different frequency conditions, when the loudness is the same, the required sound pressure level is different.
2. The relationship between loudness duration
In addition to related factors such as sound pressure level and frequency, loudness is also related to the duration of waterproof Bluetooth speaker sound. A large number of test results show that: within the duratio
n of the 100ms~200 mode, the loudness of the waterproof Bluetooth speaker sound increases with the increase of the duration. So, to some extent, hearing is made up of memory function.
3. The relationship between loudness and sound pressure level
Since the "square" value of the loudness level is not in direct proportion to the perceived loudness of the human ear, for the convenience of calculation, people have defined the loudness unit "sone" (sone), which is proportional to the human ear, and conforms to N. It is stipulated that the loudness of a 1KHz pure tone with a sound pressure level of 40dB is 1 song, and a loudness that is twice as high as 2 song, and a half-tone loudness of 0.5 song.
The relationship between loudness and loudness level roughly satisfies the following formula:
LN=40+33lgN
It should be noted that the synthesis of loudness levels cannot be added directly, but loudness can be added.
For example: two sounds with different frequencies with 60 squares, the synthesized loudness level is 70 squares.
