The Hi-Fi audio system can be divided into an integrated, packaged and combined structure. The all-in-one sound system is equipped with equipment and speakers of various functions in one case, and can not be disassembled at will. Such machines are generally low-end popular machines. The set-type sound system is designed by the manufacturer, and the various equipments can be combined with each other, and the units can be disassembled. The audio combination is a combination of various types of equipment according to personal preferences.
The sound system is mainly composed of an auditory system (human ear), a hardware system (equipment), a software system (signal source), and a listening environment.
It refers to the equipment that converts magnetic signals or digital signals in audio software into electrical signals. It mainly includes DVD, S-VCD, VCD, CD, tuner, deck and high-fidelity video recorder.
The power amplifier mainly amplifies the weak signal input by the sound source device to generate a large enough current to push the speaker to reproduce the sound.
The speaker is the mouthpiece of a set of audio equipment. The final sound of the sound source software depends on the speaker. The sound quality of the audio equipment is completely expressed by the speaker, so the speaker plays an important role in the audio equipment.
What are the main technical indicators of the sound system?
There are also the main technical indicators of the sound system: frequency characteristics, signal to noise ratio, dynamic range, transient response, stereo separation, stereo balance.
Frequency characteristics: the frequency range (frequency response) of the audio equipment during playback and the relationship of the signal amplitude with frequency (amplitude frequency characteristics). The unit of amplitude is dB and the unit of frequency is Hz. The frequency response of the sound system is at least 32-18000 Hz, and the signal amplitude variation should be less than 2 dB in this frequency range.
Signal-to-Noise Ratio: The logarithm of the ratio of useful signal to noise at the same reference point. At the input point of the speaker, the signal-to-noise ratio is 70dB, and the noise of the human ear is almost inaudible. The Hi-Fi system generally reaches 100dB or more.
Dynamic Range: The logarithm of the ratio of the maximum undistorted output power to the system noise output power at rest during playback of the audio equipment. Hi-Fi systems generally reach more than 100dB.
Distortion: The degree of distortion of the source signal when the audio device is playing back. There are harmonic distortion, crosstalk, and transient distortion. Hi-Fi system harmonic distortion is generally less than 1%.
Stereo separation: The separation of the left and right channels. Reflects the degree of crosstalk between the left and right channels.
Stereo balance: The difference between the signal gains of the left and right channels.
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