Books published by National Defense Industry Press in 2010
Speaker System is 2010National Defense Industry PressThe book was published by Takeo Yamamoto (Japan).This book fully explains the structure, characteristics, positive functions and disadvantages of loudspeakers, so that everyone has a deep understanding of loudspeakers.
Title
Speaker system
Author
(Japan) Takeo Yamamoto
Translator
Wang Yizhen, Wu Guangwei, Zhang Shaogao
press
National Defense Industry Press
Publication time
January 1, 2010
Pricing
42 yuan
Folio
16 ON
ISBN
nine trillion and seven hundred and eighty-seven billion one hundred and eighteen million sixty-five thousand seven hundred and twenty-five
Speaker systemIt is composed of one or several loudspeakers and corresponding accessories, such as baffle, loudspeaker, crossover network, etc., as the coupling equipment between the driving circuit and the surrounding air.The purpose is to obtain the requiredfrequency characteristic, sound field distribution and special sound effects.Commonly used loudspeakers include direct electric loudspeakers, loudspeaker electric loudspeakers and various combination loudspeakers.Only direct loudspeaker is used to radiate sound power, and the sound pressure level in the service area is uneven.The use of horn type electric speakers with large sound power can basically make the sound intensity in the sound reinforcement area large enough and uniformsound fieldHowever, its narrow frequency range cannot meet the requirements of high-quality music sound reinforcement.Therefore, combination speakers are often used.This not only widens the frequency range but also increases the radiated sound power.The application of various speaker boxes and speakers can improve the low-frequency characteristics, directivity and efficiency of speakers;After various loudspeaker groups are adopted, its sound power and radiation characteristics can be further controlled.As for special sound effects, such as sound reinforcement in the case of long distance and strong noise, the sound power should be hundreds or even several kilowatts. At this time, air flow speakers can be used.
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This book introduces the structure, working principle and characteristics of paper cone speakers, dome shaped speakers, horn speakers and various speaker boxes in detail, as well as acoustic knowledge related to speakers.The book is divided into 16 chapters, including the physical process of sound reproduction, auditory psychology, the nature of program sound, the performance of high fidelity speakers, paper cone speakers, dome shaped speakers, horn speakers, speaker boxes, speaker systems, monitor speakers, other types of speakers, amplifiers and speakers, the acoustic nature of sound reproduction and rooms, speaker systems for sound reinforcement,Methods of measurement of headphone and loudspeaker characteristics.
This book can be read and referenced by technicians and workers of speaker manufacturers, researchers of relevant scientific research institutions, and teachers and students of relevant majors in colleges and universities.It also has a certain reference value for the majority of speaker users.
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Chapter 1 Physical Process of Sound Replay
1.1 Acoustic wave 1
1.1.1 Sound 1
1.1.2 Three elements of sound 2
1.2 Theory of sound field 3
1.2.1 Sound field equation 4
1.2.2 Velocity potential 6
1.2.3 Plane wave sound field 7
1.2.4 Standing wave 9
1.2.5 Spherical wave sound field 9
1.2.6 Refraction of sound wave 11
1.2.7 Diffraction of sound wave 12
1.3 Sound radiation system 13
1.3.1 Sound field generated by circular piston vibrating plate 13
1.3.2 Directionality of radiated sound 15
1.3.3 Radiation impedance 18
1.3.4 Radiated power of point sound source near barrier 21
1.4 Mechanical vibration system 23
1.4.1 Single degree of freedom vibration system 23
1.4.2 Membrane vibration 25
1.4.3 Plate vibration 25
1.5 Sound vibration system 26
1.5.1 Sound wave propagating in sound pipe 26
1.5.2 Acoustic elements 27
1.5.3 Acoustic transducer 29
1.6 Electrical force sound system analogy 29
1.6.1 Equivalent circuit of mechanical system 29
1.6.2 Equivalent circuit of sound system 30
1.6.3 Electrical mechanical acoustic analogy 32
1.7 Electroacoustic transducer 33
1.7.1 Electric transducer 34
1.7.2 Electrostatic transducer 36
References 39
Chapter 2 Hearing Psychology
2.1 Human ear and hearing 40
2.1.1 Structure of human ear 41
2.1.2 Hearing mechanism 42
2.2 Properties of sound 43
2.3 Hearing threshold 43
2.4 Tone (high and low voice) 44
2.4.1 Main factors affecting tone 44
2.4.2 Measurement of tone 45
2.5 Loudness and iso loudness curve of sound 45
2.5.1 Sound intensity and loudness 45
2.5.2 Isophonic curve 45
2.5.3 Song Dynasty Scale.................................... 46
2.5.4 Loudness and duration of sound 46
2.6 Noise pollution 47
2.6.1 Expression method of noise intensity 47
2.6.2 NRN curve 47
2.7 Masking 48
2.7.1 Masking effect 48
2.7.2 Mutual masking of pure tones 49
2.7.3 Voice color change caused by masking 50
2.7.4 Width of critical frequency band 50
2.8 Sense of sound change.................. 51
2.8.1 Discrimination threshold 51
2.8.2 Frequency discrimination threshold 51
2.8.3 Discrimination threshold of sound intensity 51
2.8.4 Frequency modulation discrimination threshold 52
2.8.5 Discrimination threshold of AM 52
2.8.6 Discrimination threshold of frequency characteristic change
2.8.7 Distortion discrimination threshold 53
2.8.8 Discrimination threshold of phase change 54
2.9 Sense of voice color 56
2.9.1 About Voice..................... 56
2.9.2 Factors determining timbre 56
2.9.3 Evaluation terms of sound quality
2.9.4 Relationship between sound quality evaluation terms and physical characteristics
2.10 Directional Positioning of Two Channel Replay.................................... 62
2.10.1 Direction positioning capability 62
2.10.2 Directional positioning of two channels 63
2.10.3 Two channel playback
2.10.4 Makita Theory on Stereo Sound Field 64
2.10.5 Nature of sound image 65
2.11 Orientation of multi-channel playback
2.11.1 Orientation of real sound source in horizontal plane 66
2.11.2 Orientation of synthetic sound source in horizontal plane 69
2.11.3 Arrangement of speakers for multi-channel stereo
2.11.4 Phase difference and sense of compression between sound channels 71
2.11.5 Breadth of sound field 71
References 73
Chapter 3 Nature of the sound
3.1 Nature of sound source 75
3.1.1 Method of representing sound source property 75
3.1.2 Band..................... 76
3.1.3 Dynamic range 76
3.1.4 Directivity 77
3.2 Nature of program sound 77
3.2.1 Expression method of sound property of broadcast program 77
3.2.2 Spectrum..................... 78
3.2.3 Level distribution 78
3.2.4 Spectrum level distribution 80
3.2.5 Two Channel Stereo and Four Channel Signals
References..................... 82
Chapter 4 Performance of High Fidelity Speakers
4.1 Composition of audio playback device and tasks of loudspeaker 83
4.1.1 Composition of audio playback device 83
4.1.2 Factors affecting playback sound quality 84
4.2 Output sound pressure level 84
4.2.1 Output sound pressure level and efficiency 84
4.2.2 Rated input power and maximum input power 86
