Research on the Developmental Trend of Computer Mu

esearch on the Developmental Trend of Computer Music R

Technology under the Background of Multi-channel Stereo

Recording

Mou Xin

( Binzhou University, Shandong 256600 China )

Abstract. In this paper, we conduct research on the developmental trend of the computer music technology under the background of multi-channel stereo recording. Surround sound is not only used in the fi lm, home theater, also penetrated the digital TV and digital broadcasting. But because of the limitation of storage media capacity and transmission bandwidth must use all kinds of that audio compression technology to transmit audio data. As a more general and more practical signifi cance, as masking and by masking sound are not limited to their respective resend by a single speaker, but in different proportion to their respective ‘channel sound level is poor. To deal with this issue, this paper integrates the signal denoising method as the optimization and achieves better performance.

Keywords: Computer Music, Multi-channel Stereo Recording, Background, Developmental Trend.

1 Introduction

Computer music belongs to the category of the digital technology and network technology. Computer music is the combination of music and art with modern electronic technology that is the combination of the computer systems and electronic musical instruments, music production technology by leaps and bounds are now benefiting from the development of computer music technology. Based on the literature review, the development of computer music lays the foundation on the listed issues.

·Electronic Musical Instruments (mainly electronic synthesizer) digital and the miniaturization technology of mature [1-3].

·The rapid development of computer technology, the emergence of that micro-computers and personal, family.

·As between the electronic musical instrument and electronic instruments and other electronic devices between “communication” (exchange information) means the birth of the so-called “MIDI” technology and widely used.

A computer can be divided into two major categories of general simulation computer and digital computers. We are now talking about the computer that is digital computer. Computer has arithmetic unit of basic components, memory, controller, input device and output device, such as five most and for the modern methodologies, it can be generally separated into the listed components. (1) Many VST with functions of sampler, and can call other format fi le, extract has been synthesized all kinds of sound and that tone. (2) Such as mixer, breathing controller hardware, and can real-time adjust the connected external control equipment internal data. (3) In the MIDI production such as frequency, amplitude, time, envelope modulation, produce all kinds of sound, can make all kinds of tone color combination with each other and voice synthesizer class VSTI to have modified, processing, also can produce unprecedented “new” sound [4-5].

The most widely used of multichannel surround sound track configuration is recommendations. Surround sound is not only used in the film, home theater, also penetrated the digital TV and digital broadcasting. But because of the limitation of storage media capacity and transmission bandwidth must use all kinds of audio compression technology to transmit audio data. Different coding method used in different fi elds, but have a common goal, namely without sacrificing voice quality under the premise of

— 36 —minimum rate of basic transmission of the data. Using many of the human ear hearing characteristics such as masking effect, Haas effect removes the redundancy in PCM signal, so as to reduce the amount of data involved in coding. At the same time, and then coded signal bit precision, the distribution of the changes in amplitude is larger or faster signal distribution, the number of bits in the more and the small, slow changes of signal amplitude is to reduce the number of bits allocation, so as to realize the high effi ciency of coding shown in the fi gure one.

Figure 1. The Multi-channel Stereo Recording

In this paper, we conduct research on the developmental trend of the computer music technology under the background of multi-channel stereo recording. In the later sub-sections, we will discuss and analyze the corresponding issues in detail from different perspectives.

2 Our Proposed Methodology

2.1 The Dimensional Sound

In real life, we in addition to hear directly from the source of the direct sound outside, still can hear the sound of many refl ection from all directions and reverberation sound, refl ections and reverberant sound combined form the “environment”. Sound environment not only make direct sound mellow and full, but also make the listener can judge the size of the basic live performance

International Journal of Technology Management

scene, have important influence on listening psychological. Usually, listening to the double track stereo acoustic properties of a room shape, size and are different from the studio, located in the listener is put in front of two speakers sound cannot be reproduced adequately make the person produces telepresence environment, also cannot the release with live performances of same quality.

The SRS is sound recovery system of English abbreviations. SRS technology is based on human auditory system of the latest research results of physical and psychological, on the principle of bionics developed a 3D stereo technology. The biggest characteristic of the SRS surround sound is: only two speakers can produce a complete 3D stereo field. As a more general and more practical significance, masking and by masking sound are not limited to their respective resend by a single speaker, but in different proportion to their respective ‘channel sound level is poor, at the same time feeding stereo speakers to resend, so that the sound masking and occult sound stereo audio-visual corresponding to different directions. Sound body to receive part of the infrared wireless headphones will receive has modulation infrared light for demodulation, reduction of the audio signal, and then sent to the stereo headphones. The system has good sound quality, wide frequency response, and good anti-jamming performance characteristics that will be essential [6-7].

2.2 The Computer Music Technology

Creation refers to the sound engineer use three times, that recording technology, stereo sound transmission technology, digital audio technology, such as general technology, reprocessing of basic music works of a creative process. When our music workers in the theatre, when studio recording, are no exception, contains a sound engineer, the engineer the creative work of music works. Since the MIDI technology appeared, musician composing, playing, editing itself on the personal computer, recording synthesis, each music creation process independently has become possible. We can say the MIDI music creation is the collection of music creation three stages is a body comprehensive creation. With the development of computer technology, in the third creation technique is more and more reasonable, and its impact to the traditional principles of music creation is becoming more and more essential that can be refl ected from the following layers.

·Melody layer. Melody is the level of the main and factors in the texture structure it is the soul of the whole song. Melody is mainly divided into the theme and deputy melodies. Dominant in the melody layer called the theme.

·Harmony layer. Harmony is the foundation of the whole music, its protean texture, fi gure and the bass is inseparable from the harmony conception. Harmony for music, rendering the color, foil background image, music form climax, etc. have important means of performance, and determine how close the callback, tonality, mode and main symbol of transfer.

·The bass level. Bass line is the whole piece of music sound basis, its itself is an independent parts it is in the lower end of the two outer parts, sound obvious, it directly affects the function of chords, speed and rhythm of the music, even can affect the texture of the notation.

Figure 2. The Computer Music Technology Demonstration2.3 The Signal Denoising

Music signal mixed with noise disturbance, in the process of acquisition to the extraction of accurate notes, will remove the interference of noise as this needs the music signal denoising, these interference with working frequency of 50 HZ interference is most obvious and to filter out the noise that can adopt the method of amplitude value accumulation [8].

Accounted for most of the low frequency signals in music, and high frequency signal is foil effect. To extract the beat information, will fi lter out high frequency signal interference, get the envelope signal. Therefore need to introduce a fi lter, to ensure that the signal through the fi lter, and as far as possible to reduce the distortion at the same time, guarantee for effective frequency selective filter, frequency signal attenuation is invalid, the Gaussian function is a proper window function. Due to the time domain expression and frequency domain expression of Gaussian fi lter is a Gaussian function, in the form of direct use of Gaussian function for the design of fi lter cannot be achieved in the physical. And the corresponding de-noising performance is shown in the fi gure 3.

Figure 3. The Illustration of the Musical Signal Denoising2.4 The Multichannel Audio Information

Low-level audio multimedia services function through the device handle and device ID to be distinguish as low-level audio services includes the following content: (1) the query audio equipment; (2) the opening and closing device driver; (3)

— 37 —Conference Proceedings Citation Index

distribution and preparation of audio data block; (4) management audio data block; (5) apply MMTIME structure; (6) Handle errors. In this system, in order to complete the multichannel audio no distortion of acquisition and playback, the audio data buffer allocation and management plays a decisive role. For each input channel and output channel (recording) (replay) assigned separate buffer, which uses double buffer, double buffer technique is to use two kinds of buffer to ensure real-time digital audio processing need a way. In addition, for multichannel audio capture and broadcast not only need to obtain input/output channels of buffer management, but also set up a public buffer to meet the needs of the multi-channel audio switch. And the element information could be summarized as the follows.

Listen to the audio output channel: 1 road stereo analog or digital output channels;

Audio fi le formats: mpeg-1 LayerII (MP2), WAV.

Sampling frequency: 8 kHz, 16 kHz, 32 kHz, 44.1 kHz, 48 kHz;

Bit rate/bit rate: 8 bit and 16 bit;

Compression rate: 32 KB/s, KB/s, and 128 KB/s, and 128 KB/s.

The network interface: 10/100 RJ45 m Ethernet front-end ports;

Maximum input level: + 22 db z + 24 V/db zV.Input impedance: > 20 k fat;

Frequency response: 20 hz 20 KHZ: in accordance with 0.2 dB;

WMA codec Profi le has the following three categories: WMA standard, WMA professional, WMA Lossless. WMA standard maximum two channels of audio data, WMA professional and that Lossless supreme will support to the 8 channels. More channels are the presence of multiple output configuration problems that still in 5.1 in this passage illustrates Microsoft Multimedia multi-channel audio data confi guration standards.

2.5 The Electronic Music Developmental Trend

As a branch of modern music of electronic music, its spatial

thinking by other than electronic music types of spatial thinking in modern music, and relying on the advantage of technology, such as multichannel recording and playback system, etc., on the basis of the spatial thinking in the electronic music, will expand and extend them, the static sound space stereo feeling, constitute a multidimensional the static stereo space, the space of the dynamic motion way is rich, constitute a variety of dynamic movement space. So, in the development process of the exploration as has formed two major spatial thinking in electronic music: static spatial thinking multi-dimensional thinking and dynamic movement. With the integration of the Chinese feature, we can then summarize the corresponding features in China as the follows.

·Combined with aesthetics and art. Chinese ancient culture,

— 38 —the ideology of Confucianism, Taoism and legalism, “and”

aesthetic point of view. The extensive and profound Chinese poetry, of early Chinese music and poetry together, all refl ect the aesthetic feeling of fl ow.

·The nationality of electronic music. The Chinese nation’s long history, in the music creation constantly showing national characteristics and advantages, it is not hard to fi nd, in China a lot of electronic works refl ect the national character.

·Network to promote the development of electronic music innovation, that fast information communication let creators have broader shared resources.

3 Conclusion and Summary

In this paper, we conduct research on the developmental trend of the computer music technology under the background of the multi-channel stereo recording. When our music workers in the theatre, when studio recording, are no exception, contains a sound engineer, the engineer the creative work of music works. Since the MIDI technology appeared, musician composing, playing, editing itself on the personal computer, recording synthesis, each music creation process independently has become the possible. Under this basis, this paper proposes the novel perspective of the issues that is innovative.

References

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[4]Bates, Enda. “SpaceMaps, Manifolds and a New Interface Paradigm for Spatial Music Performance.” (2015).

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[6]Clark, Colin, and Adam Tindale. “Flocking: a framework for declarative music-making on the Web.” ICMC| SMC. Athens (2014).[7]Lassfolk, Kai, and Mikko Ojanen. University of Helsinki Music Research Laboratory and Electronic Music Studio–The fi rst 50 years and beyond. Ann Arbor, MI: Michigan Publishing, University of Michigan Library, 2014.

[8]Monferrer-Sales, Lidón, Gil Lorenzo-Valentín, and Alberto Cabedo Mas. “An Educational Proposal on Interdisciplinary Education: The Fractal Geometry in Mathematics, Music and Biology.” Procedia-Social and Behavioral Sciences 116 (2014): 3825-3829.