The difference between professional audio system and home audio
The difference between professional audio and home audio is the difference in the place of use.
Home audio is generally used for indoor indoor broadcasting. Its characteristics are that the sound quality is delicate and soft, the appearance is more delicate and beautiful, the sound pressure level is not too high, the power is relatively low, and the range of sound transmission is small. Professional audio generally refers to professional entertainment venues such as dance halls, karaoke halls, theaters, conference rooms and sports venues. Depending on the location, the requirements of the sound are different, the size of the venue, and other factors are different. Sound system solutions for the venue.
1. Home audio
Common home audio system configuration
1. Sound source: the source of sound. The common sound sources in home audio systems are cassette recorders, CD players, LD machines, VCD machines and DVD players.
2. Amplification equipment: In order to effectively and high-power the speaker sound, the signal output from the sound source is generally amplified by power. The common amplification equipment is AV power amplifier, which is generally a transistor power amplifier, but now some enthusiasts also love the tube amplifier.
3, sound-reducing equipment: that is, the speaker, its performance will directly affect the listening effect.
4. Connection line: including the connection line from the sound source to the amplifier and the connection line from the amplifier to the speaker.
Basic requirements for home audio systems
1. Requirements for home audio equipment
The ultimate goal of the home audio system is to get the desired listening effect, such as the sound effects of the theater at home. However, the family is different from the theater. Therefore, the acoustic effects required for different sounds are different. For popular music, classical music, light music, etc., it is necessary to correctly restore various instruments, but for the appreciation of the film, it requires sound effects. Feeling of the scene, feeling of envelopment, etc. For audio sources, the preferred DVD is because the DVD is a purely digital design, mostly equipped with an AC-3 interface that directly forms a Dolby Surround system with AC-3. The CD player is also good, but be aware that different sources will eventually get different sound effects (even if the devices behind are identical).
For the power amplifier, it is required to have multiple pairs of input and output terminals (if a home theater system is set up, at least 6 pairs), there is a large power output, and the impedance should be matched.
For the requirements of the speaker, the power can be smaller, because the use of the home generally does not require high-power output, but the sensitivity, pointing characteristics, frequency response characteristics of the speaker should have higher requirements, it is best to use full-range speakers, power is enough Just fine. The connection line is the easiest to ignore for the enthusiasts, but it turns out that their influence on the sound effect must not be ignored, and the frequency characteristics and shielding characteristics must be good.
2. Home audio system requirements for listening environment
For ordinary families, the living room is the listening room. Due to the limitations of objective conditions, it is no longer possible to adjust the proportion of the listening environment. However, under the existing conditions, how can the listening effect be the best? Is considered the problem: 1 symmetry of the listening environment, this symmetry includes two aspects, namely, symmetry and acoustic symmetry, geometric symmetry and acoustic settings should be geometrically symmetrical. Of course, the listening sound is taken as the reference point; the acoustic symmetry means that the acoustic conditions in the vicinity of the symmetric speaker are basically the same, including the direct reflection of the sound wave, the reflection and the absorption characteristics of the sound wave should be consistent, which requires the selection of the decorative material and the arrangement of the furniture. Good acoustic properties of the listening should be met.
Second, professional audio
General professional audio system configuration
1. Sound source (music playback device, pickup device, ie microphone)
2. Control equipment (analog mixer, digital mixer, digital audio media matrix, AV digital management center)
3, peripheral equipment (processor, equalizer, compressor, frequency divider, exciter, delay, effect, feedback suppressor)
4, restore equipment (speaker or speaker system, power amplifier, that is, power amplifier).
5, the connection line (The above equipment is connected by various types of different wires and cables to form a unified sound system.)
Professional audio system designed to the terminology
1, sound pressure level
Refers to the 20-fold logarithm of the ratio of the actual sound pressure to the reference sound pressure in decibels. It is an important indicator to measure the sound quality of the sound system and the acoustic quality indicators of the sound reinforcement.
2. Sound amplification power
The sound reinforcement power refers to the rated power required by the sound reinforcement equipment when the rated sound pressure level of the system is designed. Its unit is watts. It is a direct manifestation of the acoustic index on the electroacoustic parameters, and it will be related to the final cost of the project, so it is also particularly important.
The 50 Hz electricity exchange sound, because the sound is named after the low frequency and the humming sound, the power supply ripple coefficient of the audio equipment is too large and the anti-interference performance is poor, which will cause the humming sound.
4. Pure tone
The sound of a sinusoidal signal is a sound that has a clear single tone, such as the sound of a tuning fork.
5. Intermodulation distortion
Intermodulation distortion is a type of signal distortion in which a single audio signal whose amplitude is mixed in a certain ratio (usually 4:1) passes through the playback device to generate a new frequency component.
The frequency between the two frequencies is 2, and the octave has an octave relationship between octaves, that is, every doubling of the frequency, the pitch is increased by one octave.
A circuit device in a speaker for separating an input music signal into different parts such as a treble, a midrange, a bass, and the like, and then respectively feeding them into a corresponding high, medium, and low woofer unit for playback.
8. Dual amplifier crossover
A connection method in which each speaker unit of the speaker is driven by a separate amplifier channel. A pair of two-way speakers requires two stereo amplifiers and two pairs of speaker cables. See "Double Line Split".
9. Double line crossover
A type of wiring that transmits the high and low frequencies of the music signal separately using two sets of speaker cables. Two-wire crossover requires a specially designed speaker with two pairs of terminals.
A general term for preamplifiers and power amplifiers.
11. Power amplifier
Referred to as a power amplifier, an electronic device used to enhance the signal power to drive the sound of the speaker. A power amplifier without an accessory function such as source selection and volume control is called a post stage.
The preamplifier and control section before the amplifier is used to enhance the voltage amplitude of the signal, providing input signal selection, tone adjustment and volume control. The preamplifier is also called the preamplifier.
13. Combined amplifier
Amplify the preamplifier and power amplifier in one chassis.
Another term for tube amplifiers.
The professional audio system configuration needs to be configured by a professional to design a special sound system engineering solution according to the different requirements of different occasions. Let's take a look at the general solution for conference system engineering.
Conference sound system engineering solution
Conference audio system engineering refers to the integration of sound, light, electrical equipment and software associated with the conference. The conference system design covers all of the above aspects. The integration of the conference system is to carry out the planning and design project through careful analysis and understanding of the customer's needs. Use technology to best solve problems and provide maximum value to customers. Expected results within budget, within expectations, and harvested. Ultimately, the user is satisfied.
Typical conference sound systems include Conference Sound System (CMS) and Conference Discussion System (CDS), Conference Transliteration System (CIS), Language Distribution System (LDS), and Conference Voting System (CVS). Research and exploration are required before the design of the conference. Conduct scientific design planning. The issues to be considered in the planning of the conference system include: the purpose of the conference system, the level of the conference system, the scope of the service, the ability of the conference management, and the thinking of the international application environment.
Generally a conference can be divided into:
1 Report mode: One person tells everyone to listen, by the host, everyone faces. The basic investment in general sound reinforcement depends on the floor space of the conference room.
2 Lecture mode: The sound reinforcement form is the same as the report mode, but it is necessary to prepare the audience for questions and sound reinforcement. The video should have a display system.
3 Discussion mode: The round table ring sits in the form of a meeting, which can have sequential speaking control and individual speaking time control. It can also expand the voting system, simultaneous interpretation and other functions. The more functions, the greater the cost of input.
Scheduling conference mode:
More emphasis on the display of multi-screen, multi-information. Local and remote communication can also be emphasized. And the resolution is distributed and recorded. The cost of investment depends on the specific requirements of the content. But this is often a mandatory configuration of working conditions. Multimedia teaching and training: based on the physical environment of multimedia conferences, additional teaching software. Courseware distribution, assignment submission, teacher interview, individual Q&A, exam evaluation and other functions. Of course, you can also increase the language training function. Conference broadcast mode: It is a one-way mode in the joint conference mode, that is, the voice and image of the main conference site can only be received at the conference venue. The main venue does not have any information about the venue. It is a simple mode of joint conference mode.
Multimedia conference mode:
More use of video display systems in the form of conference sound reinforcement, such as multi-screen single-screen display, multi-screen and multi-information display. Round table lifter information display.
Different forms of automatic tracking of camera speech, recording of computer image signals, and the like. The more functions, the greater the cost of input.
Different modes of device configuration are not the same. However, there is no need to require various functions, because the building structure and desktop form may determine some requirements. Other auxiliary devices provide more convenient control, transmission, and display capabilities. Multi-function is not good for special.
Conference audio system main equipment specific features: simultaneous interpretation conference system, dimming system, projection / display system, multimedia conference control system, audio transmission and control system, audio sound processing system, environment, lighting control system.
In addition, the requirements and solutions for professional audio in different locations are different. Professional audio equipment has high requirements for users, and has a good understanding of the functions and uses of various equipments. It has professional theoretical knowledge, accurate listening ability, strong debugging level, and emphasizes fault diagnosis and elimination. A well-designed professional audio system should not only focus on the design and commissioning of electroacoustic systems, but should take into account the actual sound propagation environment and perform precise on-site tuning. Therefore, the difficulty lies in the design and commissioning of the system.