What are the characteristics of sound

Release time:

2022-06-18

Summary： The emergence of Dolby Surround Sound makes you curious. In professional audio, there will be one-armed numbers, Dolby directional logic and other nouns. What does this mean? Today, Shijiazhuang professional audio will explain to you the related problems of audio!

The emergence of Dolby Surround Sound makes you curious. In professional audio, there will be one-armed numbers, Dolby directional logic and other nouns. What does this mean? Today, Shijiazhuang professional audio will explain to you the related problems of audio!

1. What is the difference between civil audio and professional audio?

A: Civil audio is purely designed for home audio system playback; professional audio is used for monitoring or amplifying sound in recording studios or performance venues. Features of civil sound: The design is based on the principle of replaying aesthetic sounds, paying attention to details such as the sound field, the hall sound of musical instruments, and the warm sound effects of the concert hall. The product style reflects the designer's personal hobbies. The characteristics of professional audio: to be loyal to the nature of the sound as the principle, the pursuit of sound texture and accuracy. Professional products are easy to push, large dynamic, reliable and easy to install.

2. What is the basic composition of a standard hi-fi system?

Answer: According to this is the signal source (such as LD, CD, DVD), signal connection line, pre-amplifier, power amplifier, speaker connection line, speaker.

3. What is Dolby Surround?

A sound that encodes the rear surround channel into a stereo channel. Playback requires a decoder to separate the surround signal from the encoded sound.

4. What is Dolby Directional Logic?

A: A front center channel has been added to Dolby surround sound to lock the dialogue in the film to the screen.

What are Dolby Numbers?

Answer: Also known as AC-3, its digitized sound contains five channels of signals, namely, left front, center, right front, left surround and right surround, all of which are independent full-band signals. There is also a separate subwoofer channel. Commonly known as the 0.1 channel, together is the so-called 5.1 channel.

What are THX and THX5.1?

A: A surround standard developed by Lucasfilm in the United States, which improves the Dolby directional logic surround system to further enhance the surround sound effect. The THX standard has a relatively strict set of requirements for playback equipment such as audio and video sources, amplifiers, speakers, rooms and even wires. Only products that meet this standard and are approved by Lucas can be awarded the THX logo. There are two different standards: "The Ultra" and "THX Select", with THX Ultra being the most stringent.

7. What is DTS?

A: Short for split channel home digital surround sound system. Separate 5.1 channels are also used. Compared with Dolby Digital, higher bit rate, higher resolution, Dolby Digital is a strong competitor.

8. What is DSP technology?

Answer: DSP is the abbreviation of "digital signal processing. When a dedicated microprocessor handles audio instrumentation in the digital field, it can mimic the sound effects that are only found in environments such as concert halls, teaching, jazz nightclubs, etc. DSP technology is also used to decode various forms of ambient sound signals.

What is a D/A converter?

A: A device that converts digital audio signals (I. e., DIGITAL) into analog audio signals (ANALOGUE) in digital audio products (e. g., CDs, DVDs). The D/A converter can be made into an independent machine and used with a CD turntable, which is often called a decoder.

10. What are bits and bit streams?

A: The smallest unit of a binary digital signal, which always takes one of the two states of 0 or 1. The bit stream is a Philips technology that converts CD digital signals into analog music signals.

11. What is the sampling rate and oversampling?

Answer: The sampling rate refers to the speed at which a digital recorder or player samples signals. For example, the sampling rate of CD, DCC and MD is selected to be 44.1KHz, I .e. 44100 samples per second, DAT is 48KHz or 44.1KHz, and digital audio broadcasting uses a sampling rate of 32K. The sampling rate determines the highest frequency that the digital system can record. The DVD-Audio uses a high sampling rate of 96KHz. Over-sampling refers to the sampling frequency several times the standard sampling frequency of 44.1KHz in CD system. The purpose is to facilitate the filtering of digital noise after D/A conversion and improve the frequency recording phase distortion of CD players. Early CD players used 2-frequency or 4-frequency sampling, and recent machines have reached 8 times or higher.

12. What are the manifestations of sound sources in the world?

Answer: The sound source can be divided into two categories: analog and digital. Analog category includes AM/FM radio head, LP player, tape deck, video recorder, etc. Digital category includes CD player, LD player, DVD player, SACD, digital broadcasting, VCD player, etc.

13. What is the difference between Class A, Class B and Class A in the amplifier?

Answer: According to the conduction mode of the power amplifier tube in the power amplifier, there are differences between Class A, Class B and Class A and Class B. Class A, also known as Class A, is a class of amplifier in which any power output element of the amplifier will have a current cut-off during the entire cycle of the signal. Class A amplifier will generate high heat when working. The working efficiency is very low, but the inherent advantage is that there is no cross-over distortion. Single-ended amplifiers are all Class A working modes. Class B, also known as Class B, is a type of amplifier in which the positive and negative two half cycles of a sinusoidal signal are respectively amplified and output by two groups of amplification elements in the push-pull output stage. The conduction time of each group of amplification elements is half the cycle of the signal. The advantage of Class B amplifier is high efficiency, but the disadvantage is that it will produce cross-over distortion. Class A and Class B are also called Class AB, which is between Class A and Class B. The conduction time of each group of amplification elements of push-pull amplification is greater than half a cycle of the signal and less than one cycle. Class A and B amplifiers effectively solve the cross-over distortion problem of Class B amplifiers, and their efficiency is higher than that of Class A, so they are widely used.

14. What is the difference between a tube amplifier and a transistor amplifier?

answer: tube amplifier commonly known as "gallbladder machine" or "vacuum tube machine", by the tube as an amplifying element; transistor amplifier commonly known as "stone machine", by the transistor as an amplifying element. Under the same output power, the tube amplifier has strong anti-overload ability, and the distortion is small in the case of large signals: because the tube amplifier uses output transformer isolation, the low-frequency response is not as good as the transistor amplifier. Electron tubes are not as good as transistors in terms of lifespan. Transistor amplifiers can be designed for high power and drive faster than tube amplifiers.

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How to choose the sound of Shijiazhuang theater

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Sound quality is good or bad need to pay attention to what the problem