1, high signal-to-noise ratio

The recording form of digital audio is binary coding, and only "0" or "1" is needed for playback.

Therefore, the noise of the recording medium has little influence on the signal-to-noise ratio of the reproduced signal.

The recording form of analog audio is a continuous sound signal, which will be affected by tape noise when recording and playing, and will be superimposed on the sound signal to make the sound quality worse. Although noise reduction measures have been taken in analog audio, they cannot be eliminated fundamentally.

2. Low distortion.

In the process of analog audio recording and playback, the nonlinearity of the magnetic head will introduce distortion, so measures such as AC magnetic bias recording must be taken, but the distortion still exists.

In digital audio, the magnetic head only works in magnetic saturation or non-magnetic state, that is, 1 or 0, and there is no linear requirement for the magnetic head.

3, good repeatability

Digital audio equipment has been copied and played back many times, and the sound quality will not deteriorate.

In the traditional analog cassette tape recording, the recorded noise will increase every time the tape is re-recorded, and the signal-to-noise ratio will decrease by about 3 dB every time it is re-recorded. Sub-band is not as good as master band, grandson band is not as good as sub-band, and the sound quality will gradually deteriorate.

4, the sloshing rate is small.

Because of the function of time-base correction circuit, the instability of rotating system and driving system in digital audio playback system will not cause chattering, so there is no need to require precise mechanical system as in analog recording.

5, strong adaptability

Digital audio records binary code, and all kinds of processing can be carried out as numerical operation, without changing hardware, only using software to operate, which is convenient for microcomputer control, so it has strong adaptability.

6, easy to integrate

Because of digitalization, it is convenient to adopt VLSI, the whole machine is convenient to debug, with stable performance and high reliability, which is convenient for mass production and can reduce the cost.

Flat-panel audio is composed of sound source input device, signal amplifier (amplifier) and speaker, which is a complete system. Bending waves are excited in the resonance board by exciter (driver) to generate sound.

After several years of market expansion, it has been widely used in: home theater system, background music system, multimedia audio system, public broadcasting system and so on.

superiority

1. The directivity is very good.

Generally, the speaker composed of traditional speakers has poor directivity, so you must stand in front of the speaker to hear more perfect sound, especially the high-pitched part; And if you stand on the side of the speaker, you may not hear some background or accompaniment sounds; If you stand on the back of the speaker, maybe that sweet song has become a voice you don't want to enjoy.

Flat speakers do not have the above problems, no matter where you stand, you can enjoy the complete and true sound;

2. The sound attenuation is small.

Traditional speakers, if you get too close, you will find that the sound is very loud, and if you are farther away, you will feel that the sound is much smaller.

Flat panel speakers do not have the above problems. Whether in a short distance or a short distance, there is not much difference in the sound you hear.

3. The fidelity of sound is very high.

Usually, the shape of a traditional horn is a sound cone. When it vibrates to make sound, it tends to concentrate the sound in the throat, compress it, and then spread it out. What people hear is the sound of compression deformation.

Flat speakers will not have the above problems, just because people have heard too many distorted sounds before, so once they come into contact with flat speakers, they will feel very ordinary at first, but later they will often be deeply attracted by its natural performance;

4. Ultra-thin appearance, does not occupy space.

Because of the special structure of the flat speaker, the speaker can be placed in any position, unlike the traditional speaker, because the listening effect is very different because of the different placement positions; classify

Generally speaking, stereos can be divided into mini speaker and home theater sets.

Generally speaking, there are two kinds of stereo: desktop stereo and floor stereo.

Because of the high requirements for sound quality, its two speakers are generally relatively large.

According to the structure (floor) of the main engine, there are two kinds of acoustics: integrated and layered.

In integrated audio, all parts of its circuit (including jukebox) are in a shell, which is generally used for low-end audio.

In layered stereo, the number of layers is different according to the grade of the machine.

The combo has many layers: record player, CD player, tuner, dual-card recording and playback bracket, tuning controller and main power amplifier.

In the low-level stereo, the record player and CD player have one floor each, and others also have one floor.

development trends

Miniaturization, digitalization, specialization and film and television are the inevitable development trends of home audio.

Miniaturized sound.

Miniature desktop combo has a long history, and the advanced subminiature combo appeared more than 10 years ago.

However, due to the poor solution of listening speakers, stereo players and recording card holders, it has remained at a low level.

In order to create a compact sound world, we should not only work hard on the power amplifier, control components and left and right speakers, but also consider the tuner, CD player and recording card holder.

Digital sound.

Digital technology is a new technology, so digital audio is developed when solving the problem of analog audio noise distortion.

After digital audio technology is adopted, the recorded digital signal has clear resolution from sampling frequency to quantization characteristics, and there is no color jitter, so a very clear image can be obtained.

And it can be interchanged with the upper computer, which is incomparable to analog video recording and playback equipment.

Digital recording can record the time, name and address into the tape together, complete the cataloging work with a micro keyboard, change the number of tracks, and add the remote control function to automatically search the tracks you need, which is very convenient to use.

Integration of audio-visual equipment.

With the development of electroacoustic technology, film and television technology and computer technology, digital audio can form a seamless multimedia film and television audio system in the family.

Such a system can hear all kinds of signal inputs and the function conversion required by the addition of all kinds of inputs, and the public can see all kinds of images and hear all kinds of sounds through computer processing.

The emergence of ultra-thin flat-panel speakers and flat-panel audio makes it possible for family groups (home theaters and background music) to develop in an ultra-thin direction. From 1998 to 20 12, flat-panel audio has also experienced several development stages. From 1998, Sannuo Company introduced flat-panel audio, which was inherited and developed by Hualong Sheng Di (DS) and Tuomicrogram (TVC). In 2008, Chengdu Tian Xiang (HVS) developed China's own flat-panel pronunciation technology VT, which is called "the fifth-generation flat-panel pronunciation technology". The development of flat-panel audio technology in China is becoming more and more mature, and the use of thin mural and ultra-thin audio in the family is becoming more and more mature!

Embedded audio, the emergence of embedded audio originated from Chengdu FREENOTE in 1998. After more than ten years of development, embedded audio has played a great role in "home central network audio system" and "embedded home theater". Chengdu Tian Xiang (HVS) combines the advantages of flat-panel speakers and embedded audio, and develops a new generation of home audio system "Home Health Audio System", which is a tentative step for the development of home audio! volume

The acoustic characteristics of professional audio should not only meet the requirements of national standards for acoustic characteristics, but also meet the requirements of subjective hearing, because acoustic characteristics can not fully reflect the actual acoustic effect, and the quality of sound is ultimately determined by people's subjective hearing. In acoustic design, electroacoustic and architectural sound design should be well coordinated to meet the following subjective hearing requirements: appropriate loudness.

Loudness is the feeling of actual listening intensity, which is directly related to the maximum sound pressure level index of the sound reinforcement system. For performances, only when the loudness is large enough can the sound effect be fully exerted.

The output power of the system and the placement of speakers will directly determine the loudness of the listening area: HD.

rich

When you use it as a speech, you must ensure the clarity of the language. If people can't hear the speaker's language clearly, it will affect the effect of the speech.

Therefore, in the design of electro-acoustic system, we should give full consideration to improving language clarity: full enough.

A full playing effect can make the sound full and vigorous, and the music melodious and active.

In the electro-acoustic system, only by using sound peripherals to effectively process sound signals and selecting sound boxes reasonably can the sound fullness meet the requirements.

App application

Computer-aided design of acoustic characteristics of sound reinforcement system is an ideal method for engineering design by using modern technical means, with high precision and efficiency. More importantly, the engineering design results can be known without waiting until the end of installation and debugging.

The computer design system of acoustic characteristics has good reliability and accuracy. When the input building sound data is accurate enough, the error can be controlled within decibels compared with the final electroacoustic measurement results.

This is enough for engineering design, installation and debugging, and also has a good guiding role for design, installation and debugging, which has been well verified in previous engineering design.

Using acoustic CAD computer system to design and calculate the acoustic characteristics of the sound reinforcement system in the hall, gymnasium (field), multi-function hall and lecture hall means that the design, installation and debugging results can be known without waiting for the system installation, debugging and measurement.

In other words, according to the sound system and design calculation results given in this design scheme, the expected acoustic characteristics of the sound reinforcement system of this system have been clearly seen.

Mini-speaker is a kind of micro-audio, which is also called "USB audio" by many friends. Connecting a computer or a USB jack through a USB interface is compact, portable and fashionable.

Mini speakers can be connected to most audio output devices, such as MP3, MP4, MP5, mobile phones, computers and so on. (Some devices may require an adapter).

The shape design is simple and fashionable, small and exquisite, and there are many varieties.

The lithium battery of the fuselage is powered and can be carried around.

High power output is also suitable for outdoor use.

The assembled mini speaker is more suitable for home.

trait

1, compact size, easy to carry, cool appearance, trendy fashion, personalized color matching, fresh and natural.

The largest is no more than a football, and the smallest is as big as an egg;

2. It integrates power amplifier, battery and dual speakers, and pioneered patented technology, expanding the cavity of mini-speaker in a telescopic way, which solved the problem of narrow cavity of mini-speaker, broke the external specifications of speaker for decades and compressed it to the limit;

3. You don't need a long audio cable, and you don't need an external power supply. Whether it's a fresh rhythm like a mountain stream or a surging DJ dance music, you can show it vividly!

4. The design is concise and easy to use.

Use USB standard interface for power supply and audio input, plug and play without driving USB interface, fully compatible with WINDOW 95 98 ME 2000 and XP operating systems.

It has a 3.5mm stereo audio input interface, linking notebooks, desktop PCs, mobile phones, PSP, walkman, MD, Mp3, PDA, Mp4, repeater, iPod, mobile phones and other devices;

5. Mini speakers only need to be connected to laptops, mobile phones and other devices, and can play wonderful music without power supply.

Some speakers are equipped with large-capacity lithium batteries, and the products can play music for 5-8 hours.

Dual power mode is more durable.

6, portable performance suitable for outdoor sports explorers, leisure people, outdoor cyclists, but also suitable for computer sound reinforcement, as a small computer speaker.

In short, mini speakers are loved by more and more people because of their small size, long playing time and loud external speakers, unlike traditional MP3 players, which need to wear earplugs and hurt eardrums! Especially sports speakers, bicycle stereos, etc! Procurement policy

Because the use place and purpose of the desktop audio are clearly defined, we can preliminarily judge that the desktop audio is mostly for broadcasting human voice content such as radio and pop music, so there is no need to set too low requirements for the speaker working frequency band of the audio.

Usually, the lowest performance frequency of the sound system can be selected above 40Hz, of course, this is for each speaker with only one unit.

If each speaker can guarantee two units (there are also coaxial speakers with high and low tones embedded together), then the sound effect will be improved a lot.

Just like an instrument is never as expressive as a band.

Layout of desktop audio

Although it is a desktop stereo, the speaker part of some desktop stereos can be installed separately.

So how do you lay out the speakers when they are installed separately?

Maybe you will say, * * * Just two speakers, what layout should we pay attention to? Of course, if your speaker is placed in the corner or the center of one side of the room, the sound effect will be completely different.

Generally speaking, we suggest that you put the two speakers of a small desktop stereo closest to the listening position, which is located on a certain axis of symmetry in the room.

The distance between the two speakers should not be too far, otherwise it is difficult to produce a sound field that is balanced with the power of the two speakers of the desktop audio.

Because it is not a professional listening room with sound absorption structure, it is best to reduce the number of times the sound is reflected back and forth in the room, to prevent the noise from increasing due to too many reflections, and to avoid the imbalance between the left and right sound fields caused by the different reflection paths of the two channels.

Of course, each detachable desktop stereo will be equipped with a speaker cable at the beginning of purchase.

Speaker lines are of equal length, so don't shorten them without authorization for fear of installation trouble, otherwise it is no different from putting two speakers far away and near.

If your speaker cable is not long enough, or you need to buy it separately for other reasons, it is recommended that you buy high-quality hi-fi speaker cable, because such speaker cable has less resistance loss, higher sound quality, and some speaker cables also have anti-interference ability.

Of course, you need to wait for a long line when you buy it.