[Home Theater Network HDAV.com.cn] With the rise of home theater, more and more people are beginning to feel the charm of the sound, whether it is listening to a beautiful music or watching a hearty movie, it will give people Leave a wonderful audition experience. But how much do you know about the sound? Today, Xiaobian will give you a set of questions, look at the sound principle technology, you can get a few points? See if you are a qualified fan! Xiaobai also has to look over and understand this knowledge to avoid pits!
Speaker principle technology 2017 high exam questions (total score 100 points)
First, fill in the blank question (20 points)
1. High-frequency, medium-frequency, and low-frequency speakers are installed in the speaker box, and signals are assigned to each unit by means of ( ).
2. When the microphone is far away from the mixer, the signal should be fed in ( ) mode.
3. In the common connector between audio equipment, the connector that specifies the signal flow direction is ( ).
4. The sound pressure level is 35dB and the frequency is 1000HZ. The loudness level is ( ).
5. In the indoor sound field, the ( ) component acts on the azimuth positioning of the sound source.
6. When the low frequency sound of the microphone is too heavy to affect the clarity of the sound, it can be compensated by the ( ) knob on the corresponding channel of the mixer.
7, in the common microphone, the need to use phantom power is () microphone.
8. Two identical power amplifiers can be connected to the ( ) circuit to increase the total output power by four times that of a single unit.
9. People rely on binaural positioning of the sound in a horizontal orientation, where the treble component is dependent on the sound between the ears ( ).
10, in the sound system, commonly used () to protect the power amplifier or speaker, to avoid the signal is too strong and damaged.
Second, multiple choice questions (20 points)
1. The minimum sound level that a normal human ear can hear is ( )
A, 0dB B, 1 dB C, 60 dB D, -20 dB
2. In order to suppress room sounding, you can select ( ) equipment.
A, equalizer B, feedback suppressor C, compressor D, effect
3. When the protection circuit breaker works, the protection mode that the sound reinforcement will not be interrupted is ( ).
A, cut off load type B, cut off signal type C, split type D, cut off power type
4. In the rectangular box room, in order to prevent the vibration reduction frequency from appearing, the ratio of the height to width of the room is ( ).
A, 1:1:1 B, 1:2:3 C, 1:1.4:1.8 D, 1:2:2.6
5. When the volume of the mixer is roughly the same, the ( ) on the different channels on the mixer should be in the same position.
A, gain adjustment B, sound image adjustment C, signal fader D, balance adjustment
6, in the digital recording parameter settings, the parameters that have no effect on the size of the sound file data is ()
A, quantized bit number B, volume level C, sampling frequency D, number of channels
7. Put the speaker into a closed box to form a closed speaker, mainly for ( )
A, improve the directivity B, improve the effect of the bass C, increase the total power D, protect the speaker
8. If the energy of the noise is determined, the noise that has the greatest influence on the sound near 2000HZ is ( )
N, 1000HZ narrowband noise B, pink noise C, white noise D, 3000HZ narrowband noise
9. For noisy live recordings, it is easier to distinguish useful sounds from noise by using stereo recording than with single-channel recording. This is the research range of acoustics. (Cocktail effect)
A, Physiology B, Psychology C, Physics D, Architecture
10, when the sound system plays in a small volume, if a certain piece of music sounds normal, then when the volume is increased, the playback effect should be ()
A, the middle will be higher, the bass will be louder B, the biggest is the bass, the middle is the second, the treble is the smallest C, the volume is increased overall, the relative amount is unchanged D, the midrange volume is weaker than the high and low sounds
Third, the judgment question (10 points)
1. The magnitude of the sound pressure indicates the strength of the sound. There are two objects that are making sound. If one causes a large sound pressure, people will hear that it emits a louder sound than the other object. ( )
2. Tone refers to people's subjective feelings about the level of sound. It is proportional to the frequency of the sound and to the intensity of the sound. ( )
3. In the extended system consisting of a stereo mixer, even if the angle of the sound image potentiometer of a certain channel is kept constant, the angle of the sound image may change. ( )
4, the role of the speaker box is used to support the speaker, it has no effect on the quality of the subwoofer. ( )
5. The sound of the loudness level is zero decibels, which can be heard by normal people. ( )
6. When the sound is digitized, the higher the quantization digits in a certain range, the better the sound effect. ( )
7. Use the gain knob and signal fader of a channel of the mixer to adjust the volume of the channel. You can choose one of the adjustments according to your convenience.
8. When the microphone sensitivity is low, the same microphones can be used in parallel to improve sensitivity ( )
9. According to the Haas effect, when the time difference between two people speaking less than 30ms, it sounds impossible to distinguish between the two sounds ( )
10, mono audio system must not be high-fidelity audio system ()
Fourth, short answer questions (20 points)
1. The analog mixer controls the sound image of the sound source through the sound image adjustment. This method of controlling the sound image is more obvious for the treble and the bass. Why?
2. In the sound system consisting of a stereo mixer, if the signal of one microphone is processed by one effector and then sent back to two channels, a reverb effect will be generated, so that the effect generated and the nature of the actual hall What is the difference between reverberation?
Five, essay questions (30 points)
1. What is the reason for the dry and partial “hard†sound? What is the improvement plan?
2. Briefly describe the role of the room equalizer.
Bell ringing, the exam time is up, please all candidates to leave the exam to leave the seat!
Please check the answers carefully to see if you have scored a few points?
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The answer is here
First, fill in the blanks
1, frequency divider; 2, wireless microphone; 3, mixer; 4, 35; 5, direct sound; 6, equalization; 7, capacitor; 8, bridge / BTL; 9, sound level;
Second, multiple choice questions
1, A 2, A 3, C 4, C 5, C
6, B 7, B 8, D 9, B 10, D
Third, the judgment question
1, × 2, × 3, √ 4, × 5, √
6, √ 7, × 8, × 9, × 10, √
Fourth, simple questions
1. A: The effect of the treble is more obvious. We know that the sound image refers to the difference in position between the sound output from the left or the right. Through the sound image positioning control knob, the signal can be distributed to the left and right bus lines in different amounts. That is, the sound image controls the proportion of the channel allocated to the left and right channels, and determines the position of the channel in the sound field.
The analog mixer does not change the time difference, only the sound level difference, and the sound level difference has a significant effect on the high sound, and the bass positioning is not obvious.
2. A: The reason for the analysis. The signal of a microphone is processed by an effector and sent back to two channels, which will produce a reverb effect. This method is to locate a point and simulate various acoustic effects to compensate for the natural reverberation. Not enough to change and beautify the tone, to enhance the appeal of the sound art; and the natural reverberation of the actual hall is the reverberation effect produced by the sound delay in all directions, which makes people sound confused.
Five, on the test questions
1. What is the reason for the dry and partial “hard†sound? What is the improvement plan?
(1) 500Hz~5KHz boost excess, appropriate attenuation;
(2) The reverberation is insufficient to increase the reverberation depth;
(3) an acoustic exciter is inserted in the channel to remove the acoustic exciter;
(4) A certain level of overload distortion occurs in a certain level of the system, and the level control button at the distortion is lowered by 5%;
(5) The speaker is overloaded, lower the volume of the amplified sound, or switch to a speaker with a higher power;
(6) The frequency response characteristics of the equipment are poor, and the equipment is replaced by a higher-grade equipment.
2. Briefly describe the role of the room equalizer.
The room equalizer is used to control the sound field in the room. It belongs to the multi-point frequency control type. Its frequency coverage ranges from 20Hz to 20KHz. It has multiple straight-slip potentiometers placed vertically, which is mainly used to compensate the audio of the listening environment building. The characteristics can be raised or attenuated at different frequency points, and its physical position is like an equilibrium curve. In various applications, it can supplement the frequency components that are lacking in the signal, and at the same time suppress the excessive weight, which compensates for the construction to some extent. The lack of acoustics guarantees the quality of the sound.
More fresh and fun home theater information, please pay attention to home theater network http:// (WeChat: cnhifi), the country's most influential home theater audio player interactive media website.
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