Why do some people say that the human ear is most sensitive to 1000 Hz?

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The feeling of sound to the ears is mainly the feeling of loudness. For two sounds, if their frequencies and sound pressure levels are different. People feel that they are not the same sound; if their frequencies are different, even if the sound pressure level is the same, the loudness perceived by the human ear is also different. Air compressors and electric saws also emit noise with a sound pressure level of 10dB, but the sound of the electric saw is much louder than that of the air compressor. This is because the air compressor radiates low-frequency noise, while the sound of the electric saw is high-frequency noise. .


Why do some people say that the human ear is most sensitive to 1000 Hz?

Human hearing is the result of natural selection. Although the sounds of nature range from infrasound to 50KHz superaudio, the frequency band that carries the most information is 0.3-3.4KHz, such as human speech, so human The ear canal has evolved to resonate exactly in the frequency band of about 1000Hz, improving the sensitivity of this frequency band.

The sound that people usually speak ranges from 500 to 2000 Hz. However, due to the characteristics of the sound itself, the ability to recognize weak sounds is usually slightly poor, and a change can only be felt when the difference is 3 to 4 decibels; but it is different for loud sounds, and a change may be felt when the difference is 0.3 decibels.

1KHz-3KHz is the frequency band where the intelligibility of human speech expression is concentrated. Among them, the mid-frequency 1KHz is the most sensitive, followed by high frequency, and low frequency is the worst. This means that if you want to hear others speak clearly, hearing at this frequency is very important. In addition, the benchmark sound pressure standard in acoustics is the minimum sound pressure that the human ear can hear for 1KHz pure tone, which fully illustrates the importance of this frequency band. Regarding sound, the sound frequency range that human ears can hear is 20Hz ~ 20000Hz. If it is lower than this range, it is called infrasound wave, and if it is higher than this range, it is called ultrasonic wave. The unit of frequency is HZ, which is Hertz in Chinese, which is the number of cycles per second of electrical, magnetic, sound waves and mechanical vibrations (cycles/second). Extended information: Hertz is also the standard unit of frequency in the International System of Units. It is a measurement of the number of repetitions of periodic changes per second. The name Hertz comes from the discoverer, the German physicist Heinrich. Rudolf Hertz, whose international symbol is Hz. The meaning of 1Hz is 1/s, which means the number of times an object completes vibration within unit time (1s), and the unit is Hertz (1 Hz = 1 time/second).


Human ears are sensitive to intermediate frequencies;
1. The hearing frequency range that the human ear can feel is between 20 and 20,000 Hz, but it is most sensitive to sounds between 1,000 and 3,000 Hz. That is, the human speech frequency is mainly between 1,000 and 3,000 Hz. When the sound reaches a certain intensity, it can stimulate the human auditory system to produce hearing. The minimum sound intensity that can just cause an auditory response is clinically called the hearing threshold. In clinical practice, the average pure tone hearing threshold is usually used as the hearing evaluation standard. The hearing thresholds at four frequencies of 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz are usually averaged. The normal hearing threshold is below 25 decibels.
2. However, due to different groups of people and actual conditions, the audible sound frequencies are different. Most adults can hear sound frequencies between 30 and 16,000 Hz. However, there are also cases of temporary hearing impairment caused by factors such as external stimulation and excessive mental stress, which can generally recover on their own. As the elderly age, various organs in the body show an aging trend, and the same goes for hearing. The range of sounds that can be heard is 50-10000Hz. Under normal circumstances, hearing problems caused by aging cannot be recovered.
3. In addition, the frequency range of human voice is 200-4000Hz. If there is noise in the living or working environment, as well as ear trauma, ear disease, genetic factors, etc. that cause hearing loss, for 200-4000Hz Sound insensitivity will have an impact on daily communication. It is recommended that patients go to the hospital for a hearing test, and a professional doctor will determine whether there is mild, moderate, severe, or even severe hearing impairment.