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1. CHORUS in the effector means chorus.
2. The local pressure of the medium caused by the disturbance of the sound wave changes, called sound pressure.
3. The unit of sound pressure level is dB.
4. The unit of sound level is dB.
5. The unit of sound pressure is (Pa) Pa.
6. The unit of sound intensity is w/m2.
7. The sound pressure at the threshold is about 2 x 10-5 Pa.
8. The sound pressure of the pain threshold is about 2 x 10 Pa.
9. The sound pressure level of the pain threshold is about 120 dB.
10. The sound pressure level of the threshold is about 0 dB.
11. The concave curved surface forms a concentrated reflection on the sound wave, so that the sound energy is concentrated at a certain point or a certain area, which is called sound focusing.
12. The convex surface reflects the sound waves, so that the sound energy forms a diffusion.
13. The minimum time interval between the human ear to distinguish two sounds is 50ms.
14. The melody in music includes vocal and instrumental melody.
15. In the music notation 1--i is called octave.
16. Indoor reverberation is caused by reflected sound.
17. The basic sound is raised by a semitone and called Shengsheng, which is indicated by the # mark.
18, the basic sound is reduced by halftone called down, expressed by the b mark.
19. The sound that has been raised or lowered has to become a basic sound called restoration, which is indicated by a ㄆ mark.
20. MIDI means the digital interface of the instrument.
21. A sound source produces a reflection between two parallel interfaces having a distance greater than a certain value to form a series of echoes, called vibrating echoes.
22. The ratio of sound pressure to reference sound pressure (2 × 10 -5 Pa), multiplied by 20 as the base, is called the sound pressure level.
23. Most of the sounds in music are complex sounds.
24, indoor early reflection sound refers to the reflection of the ear after only one reflection.
25. There are 7 basic sounds in music.
26. Two commonly used sound absorbing materials: porous materials, leaving a cavity after the thin plate.
27. Does not belong to sound insulation structure: perforated steel plate.
28. It belongs to sound insulation structure: double-layer brick wall.
29. Due to changes in the indoor frequency response, the original signal spectrum has undergone some change, called acoustic dyeing.
30, does not belong to the porous sound absorption material: gypsum board.
31. It belongs to porous sound absorbing material: rock wool.
32. Thin plate resonance structure The sound absorption feature is characterized by low frequency sound absorption and also contributes to the diffusion of sound waves.
33. Fix the wooden board on the frame, and leave a certain air layer behind the board to form a thin plate resonant sound absorbing structure.
34. The sound of the bird on the tree recorded by the sound engineer is 0.01 Pa, and the sound of the recorded military number is 1 Pa. The difference between the two sounds is 40 dB.
35, reverberation can extend the duration of the sound, improve the fullness of the sound.
36. When the frequencies of the two sources are the same or similar, and the waves emitted are superimposed, wave interference may occur.
37. Two waves propagating in opposite directions on the same line. If the amplitude and frequency are the same, standing waves will appear on the line connecting the two sources.
38. The first level indicator of the total noise level of the language and music hall is NR30.
39. The first level indicator of the total noise level of the karaoke hall is 40dB [A].
40. The acoustic focus generated indoors has an uneven effect on the indoor sound field, which is due to the presence of a concave reflecting surface in the room.
41. There is a dead point in the indoor listening because the indoor sound source generates interference or forms a standing wave.
42. The sound shadow area refers to the area where the direct sound cannot be heard indoors.
43. The sound insulation R of the object is related to the thickness of the object and is related to its surface structure and density.
44. Laying enough sound absorbing material on the concave surface can solve the defect of sound focusing.
45. Adjusting the speaker position or adding a fill speaker can solve the defects in the sound shadow area.
46. ​​Strong sound absorption or convex diffuser on the rear wall surface can solve the defects of long delay echo.
47. Adding a diffuser or changing the parallel angle on the surface of the parallel wall on both sides can solve the defect of the tremor echo.
48. The highest sound pressure level of a condenser microphone is 126dB, the equivalent noise level is 20dB, and its dynamic range is 106dB.
49. The mid-high frequency band of the audio determines the brightness and clarity of the sound.
50, the high frequency of the audio determines the color of the sound.
51. The low frequency band in the audio determines the thickness and fullness of the sound.
52. The mid-low frequency band of the audio determines the sound strength.
53. The wave line refers to the direction of propagation of the wave.
54. The echo is caused by acoustic reflection.
55. When the indoor sound field is designed, the sound absorption performance of the sound absorption material on the wall of the room is stronger, and the smaller the amplitude of the early reflection sound, the shorter the reverberation time.
56. The object with smaller sound absorption coefficient α has a larger reflection sound. The object with a larger sound absorption coefficient has a smaller reflection sound.
57, the effect of early reflection sound is to give people a sense of intimacy.
58. After the interior decoration is completed, if the natural reverberation time T60 is too long, the window door can be installed with a heavy fabric curtain to improve.
59. In the design of large halls, the near-reflex sound should be fully utilized.
60, the reverberation sound and the early reflection of the two sounds to make people sound more full of sound.
61. The sound pressure level and the sound intensity level are numerically the same.
62. Acoustic dyeing has an adverse effect on sound reinforcement.
63. The indoor sound frequency transmission characteristics are related to the sound absorption coefficient of surrounding objects.
64. The pitch is directly related to the sound frequency.
65. The room balance compensation curves for different rooms are different.
66. The sound intensity of the point source is inversely proportional to its distance.
67. The sampling frequency must be more than twice the highest frequency of the sampled signal.
68. The lower the frequency, the stronger the diffraction effect.
69. The unit of sound power is W.
70. The unit of sound pressure level is dB.
71. The unit of sound intensity is watts/square meter.
72. The unit of sound pressure is Pa (Pa).
73. The sound source and the listening person are in motion, and the listener will feel the frequency of the sound source changes. This phenomenon is called the Doppler effect.
74. The direct sound is delayed and inverted 180 degrees, superimposed on the direct sound, which makes the human ear produce a spatial impression, called the Lloyd's effect.
75. People distinguish the subjective feelings of two different sounds having the same frequency and the same amplitude, called the timbre.
76. Among the three elements of sound, the elements mainly related to the frequency of the sound are called tones.
77. The distance between the tones of two sounds is called the interval.
78. Arrange the sounds according to a certain interval, called the scale.
79. A signal whose instantaneous voltage changes sinusoidally with time is called a pure tone signal.
80. A series of pulse signals consisting of a certain number of sinusoidal waves, which are required by a series of discontinuities and durations, are called humming sounds.
81. It contains various frequency components of 20 Hz to 20 kHz, and the energy distribution of each frequency is a uniform noise signal called white noise.
82. A noise signal comprising various frequency components of 20 Hz to 20 kHz and having a power spectral density inversely proportional to the frequency, called pink noise.
83. Two microphones with directional or non-directionality are collected at a distance between the ears of the human head, which is called A/B stereo system.
84. Two microphones are combined, one is a scalloped 8-shaped microphone, the main pointing to the left side; the other heart-shaped or non-directional microphone is pointing to the front. The two microphone signals are connected to the matrix for "sum" and "difference" conversion and output, which is called M/S stereo system.
85. Two microphones whose directivity is a heart-shaped or 8-shaped shape are installed in the same microphone housing one above the other, and the angle between the main axes of the two changes within 0---360 degrees, which is called X/Y system. Stereo system.
86. The order in which the sound is heard at a certain point in the room to reach the human ear is direct sound, near-reflex sound, and reverb sound.
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