In the introduction of acoustic books and literature, we will introduce books that our R & D representators are always referring to and papers that are attracting attention.
The links to the books and literature introduced are also posted, so please use it if you are interested.
The links to the books and literature introduced are also posted, so please use it if you are interested.
Ryo Tanaka
"Micro -hon speaker discussion"
Kenroku Building Publishing
1995.3.28
ISBN4-87462-035-3
https://www.amazon.co.jp/dp/4874620353/
"Micro -hon speaker discussion"
Kenroku Building Publishing
1995.3.28
ISBN4-87462-035-3
https://www.amazon.co.jp/dp/4874620353/
Various speakers are used around us. As an announcement of the station, a concert venue, a movie theater, a TV, a smartphone, and an earphone or headphone driver. I myself woke up this morning and started my computer and already heard the sound of YouTube on a PC with a built -in PC. Probably, I don't think there is any person on a day when I can't take care of the speaker.
The speaker is a device that turns the electrical signal into a sound wave, but the application and shape vary. In this book, the output sound pressure level, input impedance characteristics, which is the basis of all speakers[1], Sound pressure frequency characteristics[2], Oriented characteristics[3], Explains distortions in an easy -to -understand manner. And the corn speaker unit[4]It also describes the example of the so -called general speaker system that contains the unit in a box (enclosure). T/S parameter[5]It is also explained. At this point, there are other excellent books, but here is the true value of this book. Control room where professional recording engineers use speakers[6]There is an explanation in accordance with the specific use case, from the room sound, the sound of the movie theater, and the speaker system used in music concerts. Furthermore, in 1995, when this book was issued, it seems that it was a state -of -the -art technology, impulse response.[7]It is explained up to the speaker adjustment using.
Yesterday, I talked about what will happen to future sounds with a professor of an art university for a long time. The conclusion that I looked back at today from the time I started working on sound is still Transdusa.[8]Only now and in the past, it continued to exist at the sound entrance and exit. The technology between the two transducers is digital audio signal processing[9]Due to the development of CPU and the speed of CPU, it has become completely different. The most important thing in producing content using sounds was how to use microphone. In this book, you can gain a lot of knowledge of microphones, from the basics to the application. Compared to the speakers, I think that the general public rarely uses various microphones and hears the sound, but recording engineers[10]Microphone is most important for anything.
Most of the music we listen to with earphones and headphones is still stereo sound.[11]It is produced in. This book describes what this stereo sound is and how to earn stereo sound content with a microphone. It's interesting to know how the music content we enjoy is recorded.
This book summarizes an article in a single book, "Broadcasting Technology," published by Kenroku Building published in technical magazines for engineers involved in broadcasting and broadcasting program production. is. As a busy engineer in everyday work reads a little, "In the conventional textbook style configuration, it is difficult to get to it and it is unpopular, so the introduction part will make various people appear in a video mood. The author states in the preface to be able to read the topic theme, and to index the necessary points. In other words, there is no difficulty in the so -called specialized book, it is interesting as a reading material, and if you find something you want to know, you can fully understand it. Each topic starts by discussing the three characters on the microphones and speakers.
This book was issued in 1995, so it is 27 years ago. As of 2022, from the viewpoint of sound technology related to content production, specific examples using microphones and speakers are somewhat old, but most of them are still useful. In other words, it can be said that there was no significant change in the technology of Trendusa. It can be said that a new technology that can be put into practical use that causes a brake -through to Transdusa is born, and it is a book that is one of the people who have been involved in acoustic and audio technology.
Powken
Technical terms
[1] Input impedance characteristics
Absolute value of the electrical impedance from the input terminal of the speaker system
[2] Sound pressure frequency characteristics
When entering a pure sound of a constant amplitude and frequency range in the speaker system, the frequency characteristics of the output sound pressure level
[3] Original characteristics
Changes in sound pressure level when moving the measurement position on the circle around the speaker, in response to the central axis of the speaker when entering a constant amplitude and an arbitrary frequency pure sound in the speaker system
[4] Corn speaker unit
A speaker unit that turns the sound directly into the space by turning the diaphragm into a cone.
[5] T/S parameter
A set of physical parameters to be measured by Austrian THILE and Small for the purpose of adjusting the speaker unit and the speaker system with a speaker unit in the enclosure. Physical characteristics under various conditions, such as a state in which a speaker unit alone and a speaker unit is included in the enclosure, is to be measured. The parameters to be measured are a wide variety of parameters, such as co -amal frequency, Q (sharpness of resonance), internal volume of enclosure, and voice coils in the speaker unit.
[6] Control room
The sounds played in various instruments in various musical instruments in the studio that perform music recording, etc. are optimally adjusted (mix) the audio signals that have been earned with various microphones, so as a music work we usually hear. It is a room for finishing sound, and the indoor sound characteristics are also optimized.
[7] Impulse response
One of the means to measure what sounds reach when the speaker system is placed in a certain space. The result of the extremely short pulse -like sound is emitted from the speaker and the sound is measured at the position where you hear the sound. Impulse response. If an impulse response is obtained, various physical data can be obtained, such as sound pressure frequency characteristics at a position to hear the sound.
[8] Transdusa
A microphone that converts sound waves into an electric signal or an electrical sound converter such as a speaker that converts an electrical signal into a sound wave is called transducer.
[9] Digital audio signal processing
A technology that allows you to create the sound you want by adding a variety of signal processing in the digital area to the digital audio signal obtained by converting analog audio signals by converting A/D (analog/digital). Currently, various audio devices are now used by research and development of signal processing theory and the advancement of digital signal processing devices.
[10] Recording engineer
A professional engineer who coordinates the sounds of various instruments with various microphones and adjusts the sounds of various instruments that have become an audio signal in real time, after recording, and finishes them into music works. In recent years, music may be created only with artificial signal sounds generated by synthesizers without using any live instruments.
[11] Stereo sound
One of the acoustic methods that tries to reproduce the actual sound field composed of musical instruments, human voices, natural sounds, etc. with two left and right speakers at the same angle in front of the listening position. In general, it is basically to place a speaker at a horizontal angle of 30 degrees on the left and right to the center axis of the listening position.
