A. Some electroacoustics noun explanation

1. Pure tone: it has two meanings: (1) refers to the sound of instantaneous pressure intercropping sine change at any time; (2) with a clear single tone of voice.

2. Pitch: refers to the complex sound in the lowest frequency component.

Overtones: composite sound frequency is higher than the pitch composition, its frequency can be a multiple of that of the pitch frequency, also can not. All kinds of instruments with different playing method can generate the number and strength of different harmonic components, even the same pitch can have different sound.

4. Sound waves: elastic medium to spread a kind of mechanical wave, originated from the vibration of the vocal body. Sonic range of 20 hz - 20 KHZ, higher than 20 KHZ sound waves of ultrasonic frequency, frequency of less than 20 hz for sound waves, ultrasonic and wares generally cannot cause hearing, only the frequency between the two sound waves to hear, we can hear the sound waves called sonic or audible sound.

2. The main technical indicators affecting the sound quality, sound

1. The frequency range (Hz) : power amplifier distortion and rated output power under the condition of working frequency band width, namely the minimum working frequency power amplifier to the highest working frequency range.

2. The frequency response (unit: dB dB) : the output of the power amplifier gain ascend along with the change of the input signal frequency attenuation and phase lag or change from the input signal frequency. Examination is the index of the most important quality of a power amplifier, the decibel ＆#118alue is smaller, flat frequency response curve of the power amplifier, the smaller the distortion, the degree of reduction and reappearance of signal and the stronger ability.

A good stereo equipment, except to the phonological representation of various Musical Instruments, but also the location of various instruments, distance, the scenes reappear. No matter what kind of color or personal preference, if played out of tone with the original instruments sound auditory differences, can't call yourself a good equipment. Hi-fi (Hi - Fi) is the true meaning of high degree of reduction. If your audio equipment can not restore the original instrument sound lasting appeal, then it is not hi-fi equipment. When we use subjective judgment hearing a sound equipment, should fully pay attention to this point, do not affect the correct judgment due to personal preference and differential ability enhancement.

5. Sound field: refers to the media there are sound waves in the area. Different sound source and the environment can form different sound field.

6. Loudness: also called the "volume", a feeling of volume to the human ear. Depending on the sound intensity, frequency and waveform.