Speaker classification

The number of channels supported by the speaker is one of the important indicators to measure the grade of the speaker. From mono to the latest surround sound, the following is introduced in detail:

1. Mono

Mono is a relatively original form of sound reproduction, and early sound cards were more commonly used. When playing back mono information through two speakers, we can clearly feel that the sound is transmitted from the middle of the two speakers to our ears. This kind of recording method lacking in position is naturally lagging behind with the current eyes, but when the sound card was just started, it was already a very advanced technology.

2. Stereo

Mono lacks positioning of sound, and stereo technology has completely changed this situation. The sound is allocated to two independent channels during the recording process, thus achieving a very good sound localization effect. This technique is especially useful in music appreciation. The audience can clearly distinguish the direction from which various instruments come, so that the music is more imaginative and closer to the live experience. Stereo technology is widely used in a large number of sound cards since Sound Blaster Pro, and has become a far-reaching audio standard. Today, stereo is still the technical standard followed by many products.

3. Quasi-stereo

The basic concept of a quasi-stereo sound card is to use mono when recording sound, and the playback is sometimes stereo and sometimes mono. Sound cards using this technology have been popular on the market for some time, but now they have disappeared.

4. Four-channel surround

People's desires are endless. Although stereo sound meets people's requirements for the left and right channel position experience, with the further development of technology, everyone gradually finds that dual channels have become more and more unable to meet our needs. The emergence of PCI sound cards has brought many new technologies, among which the most rapid development is the three-dimensional sound effect. The main purpose of the three-dimensional sound effect is to bring people a virtual sound environment, and create a sound field that tends to be real through the special HRTF technology, so as to obtain better game listening effects and sound field positioning. To achieve good results, it is not enough to rely on two speakers, so the stereo technology seems to be stretched in front of the three-dimensional sound effect, but the four-channel surround audio technology solves this problem well.

The four-channel surround specifies four pronunciation points: front left, front right, rear left, and rear right, and the audience is surrounded in the middle. At the same time, it is also recommended to add a subwoofer to enhance the playback processing of low-frequency signals (this is why the 4.1-channel speaker system is widely popular today). As far as the overall effect is concerned, the four-channel system can bring the sound surround from multiple different directions to the listener, can obtain the hearing experience of being in various different environments, and give the user a brand-new experience. Nowadays, four-channel technology has been widely integrated into the design of all kinds of high-end speakers, becoming the mainstream trend of future development.

5.5.1 channel

5.1 channels have been widely used in various traditional theaters and home theaters. Some of the more well-known sound recording compression formats, such as Dolby AC-3 (Dolby Digital) and DTS, are based on the 5.1 sound system as the technical model. The ".1" channel is a specially designed subwoofer channel. This channel can produce subwoofers with a frequency response ranging from 20 to 120 Hz. In fact, 5.1 sound system comes from 4.1 surround, the difference is that it adds a center unit. This central unit is responsible for transmitting sound signals below 80Hz, which is conducive to enhancing the human voice when watching the film, and concentrates the dialogue in the middle of the entire sound field to increase the overall effect. I believe that everyone who has truly experienced Dolby AC-3 sound effects will be impressed by the 5.1 channel.

Don't think that 5.1 is already the pinnacle of surround sound, and a more powerful 7.1 system has appeared. On the basis of 5.1, it has added two pronunciation points of middle left and middle right, in order to achieve a more perfect state. Due to the relatively high cost, the signal-to-noise ratio has not been widely popularized.

The signal-to-noise ratio refers to the ratio of the normal sound signal played back by the speaker to the noise signal (power) when there is no signal. Expressed in dB. For example, the signal-to-noise ratio of a speaker is 80dB, that is, the output signal power is 80dB greater than the noise power. The higher the SNR value, the lower the noise.

The minimum requirements of the International Electrotechnical Commission for signal-to-noise ratio are that the preamp is greater than or equal to 63dB, the post-amplifier is greater than or equal to 86dB, and the combined amplifier is greater than or equal to 63dB. The optimal value of the signal-to-noise ratio of the combined amplifier should be greater than 90dB, and the signal-to-noise ratio of the CD player can reach more than 90dB, and the high-end one can reach more than l10dB. When the signal-to-noise ratio is low, the noise is serious when a small signal is input, and the sound in the entire sound range obviously feels turbid. Therefore, speakers with a signal-to-noise ratio of less than 80dB are not recommended for purchase, and the subwoofer with a 70dB subwoofer is not recommended for the same reason.

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