改善扬声器阵列辐射特性的几种方法

沈勇，欧达毅，安康

（南京大学声学研究所 近代声学重点实验室， 江苏 南京210093）

 

【摘要】介绍了离散扬声器阵列和连续扬声器阵列的基本辐射特性。采用sinc函数理论、QR时间延迟、QR相位延迟等方法，使扬声器阵列的辐射更加均匀、声压级更高。在南京大学消声室进行的实验表明，理论计算与实测结果吻合很好。以上技术可应用于平板电视机、扩声系统等领域。

【关键词】扬声器阵列 指向性 平板电视机 扩声

Some methods of improving the radiation characteristics of Loudspeaker arrays

SHEN Yong, OU Da-Yi, AN Kang

(Institute of Acoustics, Key Laboratory of Modern Acoustics, Nanjing University, Nanjing 210093, China)

【Abstract】The radiation characteristics of both Discrete-Element Line Arrays and Continuous Line Arrays have been introduced in the paper. The loudspeaker array has more equal pressure field and higher radiating level by SINC setup, QR timing or phase delay. The experiments carried out in Nanjing University show that the results are in accordance with the theoretical prediction. The technology above can be used in the fields of Flat-Panel TV sets, sound reinforcement system and so on.

【Key words】Loudspeaker array, Polar pattern, Flat-Panel TV sets，sound reinforcement system

借助Klipple仪器对磁路系统与支撑系统的非线性校正

                                                王亚弟

                                            国光电器技术部

【摘要】以Klipple仪器作为工具,分别通过实例来比较高磁芯磁路、平磁芯磁路的优缺点及台式支片、线性平式支片、普通平式支片的特点。同时介绍了如何判断支撑系统的非线性是由折环产生还是支片引起的方法。在比较的过程中找到了如何对磁路系统、支撑系统进行非线性校正的方法,最终增大了扬声器的Xmax

可调分频点的高音扬声器

                                                李 景 海

                                        深圳市盛华源电子有限公司

【摘要】 可调分频点的高音扬声器，与普通球顶高音基本一样。声学滤波器由高音音膜上分布的孔与音膜内的反射器，通过空间分布参数形成。调整分频点是通过设计孔的数量、孔径大小、各孔之间距离、以及音膜与音膜下面反射器的距离来完成。结构简单，成本低，效果非常突出。

【关键词】分频点、高音扬声器、多路扬声器系统、声学滤波器

扬声器在音箱中的最大振幅探讨

                                                           徐耀忠

                                                      上海开源电器厂厂长

【摘要】低音扬声器的瞬时声功率输出能力决定于音盆机械强度和音圈最大线性冲程。对某一特定低音扬声器安装在闭箱、倒相式箱、双开口带通式箱、四共振式箱，在相同的功率输入（声压输出）其扬声器音盆振幅差异很大，其中闭箱振幅最大，原因是闭箱音盆在低频时声压太小，为了得到低频大功率声压可借助于覆姆赫兹共振器，安装1个共振器的是倒相式箱，安装2个共振器的是双开口带通箱。由于共振器的共振作用频率范围太狭即便有2个共振器的双开口带通箱也不足以克服30~120Hz音频范围的音盆大振幅区域，必须存在3~4个共振器。

【发明专利】一种多共振点联动低音声箱（申请号：200510028827.4），其特点是由2个扬声器单元及4个共振器组成。优点：⑴ 音箱在30~120Hz音频工作范围有4个共振点，音盆在任何频率振幅都很小，音箱最大振幅值约为倒相式箱、双开口带通式箱的50%，专利音箱与老音箱相比瞬时功率承受能力大4倍。⑵ 驱动任一共振器的音盆的驱动力来自2个驱动器，故4共振箱声压效率较高，实测比传统音箱高出1倍（3dB）。

平板扬声器声性能优化方法

张素珍，沈勇，卢国潮

（南京大学声学研究所 近代声学重点实验室， 江苏 南京210093）

 

【摘要】 平板扬声器因其特有的声辐射特性及物理特性，受到消费者的青睐和科研工作者的重视，应用领域越来越广泛，很有市场发展潜力。但是，平板扬声器的声重放质量与传统高保真扬声器系统相比仍有较大差距，要从根本上解决这个问题就必须加强理论研究。本文基于对平板扬声器电-力参数测量、箱体内衬微穿孔吸声材料、驱动器以及附加质量位置优化的理论研究和实验测试，提出了若干种提高平板扬声器声性能的方法。

【关键词】 平板扬声器 声性能 电-力参数 微穿孔吸声材料 驱动器 附加质量

Optimization Methods for the Acoustic Performance of Panel Speaker

ZHANG Su-zhen, SHEN Yong*, LU Guo-chao

(Institute of Acoustics, Key Laboratory of Modern Acoustics, NanjingUniversity, Nanjing 210093, China)

 

【Abstract】: Due to the unique sound radiation and physical characteristics, panel speaker is favored by the consumers and studied by the scientific researchers. Its applied area becomes wider and wider, which has enormous market potential. However, the reproduced sound quality of panel speaker is still far from the conventional high fidelity loudspeaker system, which can only be solved by enhancing the theoretical study. This paper presents several optimization methods for the acoustic performance of panel speaker, which are based on the theoretical and experimental studies in electrical and mechanical parameters, micro-perforated absorption material in the box, positions optimization of the actuators and attached masses on the panel.

【Key words】: panel speaker, acoustic performance, electrical and mechanical parameters, micro-perforated absorption material, actuator, attached masses

 

Sigma-Delta(Δ-Σ)模数调制技术原理及Matlab仿真

黄松华

（AAC声学科技南京研发中心，江苏省 南京邮编；210009)

 

【摘要】Δ-Σ调制技术是当前设计高性能模数转换器中被广泛使用的一种方法。它的原理是利用噪声成型技术把带内的大部分量化噪声能量转移到所需的频带之外，从而提高了带内信噪比。它简单的结构和低廉的成本使得它在许多领域都得到了广泛的应用。本文着重介绍了单比特Δ-Σ调制器的原理以及这种调制器的matlab仿真。

关键字：Δ-Σ调制 噪声成型 量化噪声

 

Principle and Matlab Simulation of Sigma-Delta(Δ-Σ) Modulation

in Analog-Digital Conversion

HUANG Song-hua†

(AACAcousticR&DCenter, Nanjing,Jiangsu 210009, China)

【Abstract】: Δ-Σ modulation is a popular method for constructing high performance analog-digital Converters. It employs noise shaping technique to push most of the in-band quantization noise outside the signal-band needed, resulting in an enhancement in in-band SNR. Based on its simplicity and economic implementation, Δ-Σ modulation has been employed in numerous areas. This paper focuses on the principle and matlab simulation of single-bit Δ-Σ modulators.

【Key words】: Δ-Σ modulation; noise shaping; quantization noise;

磁流体对扬声器频响曲线的影响

张洪进

（国光电器股份有限公司 广东 广州 510000)

【摘要】：本文通过实验说明了磁流体的使用量对扬声器频响曲线一致性的影响，以及磁流体扬声器随时间变化频响曲线的变化规律。实验表明磁流体使用量影响频响曲线的一致性，设计过程中应尽量按公式计算，不宜企图通过增加磁流体用量来达到压低低频峰以达到设计的目的；磁流体扬声器频响曲线会随时间变化而下降，测试中值样应定期作更换。

关键字：磁流体 扬声器 频响曲线

 

The Loudspeaker Frequency Response Influenced by Ferrofluids

ZHANG Hong-jin

(GUOGUANG ELECTRIC CO., LTD. Guangdong 510000)

【Abstract】:It’s shown that the consistency of loudspeaker frequency response shall be influenced by applying amount of ferrofluids in this experiment; and the regularity of the frequency response is changing with time going for the loudspeaker with ferrofluid. Designer shall design the loudspeaker according to current formula as far as possible; and shall not intent to increase the ferrofluid applying amount to decrease the peak in low frequency for the designated performance purpose, because the frequency response of loudspeaker with ferrofluid will be dropped off with time going, the golden sample shall be replaced regularly.

Key words:ferrofluid, loudspeaker, frequency response

纸浆材料特性对音质影响的探索

马鲁建，邓小忠

（广州番禺百悦电声科技有限公司，广东省广州市邮编：511400）

【摘要】 通过振膜中浆料的不同配比，试验分析了扬声器由不同的纸浆材料特性所产生的主观听感的区别与客观性能上的变化。从而对纸浆材料有更好的认识与应用。

关键字：扬声器 振膜 音质

 

Study of the Paper Pulp Material Influence on the Sound Quality

MA Lu-jian， DENG Xiao-zhong

(Guangzhou， Guangdong 511400)

【Abstract】：With the different proportion of the paper pulp materials， we test the difference of the subjective feelings and objective performance of the speaker， and know better about the materials and its application。

Key words：loudspeaker， diaphragm， sound quality

如何才能提高扬声器开发的效率

——简单探索提高扬声器开发的效率一二点

马鲁建，邓小忠

（广州番禺百悦电声科技有限公司，广东省广州市邮编：511400）

【摘要】 通过理论与实践相结合，对扬声器性能进行定性与定量的分析，从而提高扬声器的开发效率。

【关键字】 扬声器 开发效率

 

Study on the Way of Improving the Efficiency of Loudspeaker Developing

MA Lu-jian, DENG Xiao-zhong

(Guangzhou, Guangdong 511400)

【Abstract】: Through the way of combination of the theory and practice, giving the analysis on the quality and quantity, and improving the efficiency of speaker developing.

Key Words: loudspeaker, efficiency of developing

立足之本和增值之道

——浅谈专业功放设计和配置的思路

祈家堃

（中国电子学会声频工程分会，广东 广州510000）

【摘要】 “可靠性”、“稳定性”及“守法”是专业功放开发生产的立足之本。专业功放有了这个基础，才能进行产品性能提高的工作。提高专业功放性能必须围绕要放大的“信源”信号和要驱动的扬声器音箱的需求来展开，最终为人们的“听”来服务。把放大器作为音响系统的一个“部分”，从“电声学”的角度来提高功放性能，是专业功放设计和配置的增值之道。不论专业功放配置使用在何种音响系统，从可靠性观点考核，音响系统的峰值功率储备应避开“7dB陷阱”，最低12dB，最好大于等于14dB。

关键词 专业功放 音响系统

The Foundation and the Increment

——Design and Configuration of Professional Amplifier

QI Jia-kun

(Guangzhou, Guangdong, 510000, China)

 

【Abstract】: “Reliability”, “stability” and “legality” are the foundation of the professional amplifier manufacture on which the performance can be enhanced. The enhancement should focus on the “source” of the signal to be reproduced and the requirement of the sound system, with the purpose to be favorable for listening. Including the amplifier as one part of the sound system and improving the performance from acoustic point are the way to make progress. For any kind of sound system, considering reliability principle, the peak power of the sound system should be kept away from “7 dB trap”, at least 12 dB, and equaling or exceeding 14 dB would be the best.

Key words: professional amplifier, sound system

 

扬声器径向磁路设计缺陷

王富裕

（深圳东原电子有限公司，广东 深圳 518108）

【摘要】本文简要分析了扬声器径向磁路设计的利和弊，指出了设计和应用中存在的缺陷，有助大家对扬声器径向磁路有更全面认识。

关键字扬声器 径向磁路 钕铁硼

 

Design Limitation of Radial Magnet in Loudspeaker Motor

WANG Fu-yu†

(Dongyuan Electronics Co., Ltd. Shenzhen, Guangdong, 518108, China)

【Abstract】: This article briefly analyses the advantages and disadvantages of radial magnet design in loudspeaker motor. It indicates the design shortcoming in loudspeakers’ application. And It’s helpful for people to understand radial magnet application in loudspeaker correctly.

Key words: Loudspeaker, Radial Magnet, NdFeB

有源音响系统在流动演出中的应用

倪 刚

（拜玛音响 广东 广州 511400）

【摘要】 有源音响在流动演出中的应用相当方便实用。功放以及数字信号处理器（DSP）内置于音箱之中，极大地减少了因过载而损毁的可能性，另外采用限幅电路保护扬声器驱动单元，并实时监测扬声器的输出功率；在实际应用中，节省大量的音箱线材，安装方便而且减少信号的传输损耗，同时提高了功放的有效阻尼系数，为用户解决了对于功放和扬声器的功率匹配、灵敏度匹配和分频点的选择等问题。

关键字 有源音响 流动演出 线形阵列

 

The Application of Active Speakers System in Ambulatory Performances

NI Gang†

(GuangzhouGuangdong 511400)

【Abstract】: Biema active speakers systems are best fit for ambulatory performances for their convenience. With built-in amplifiers and DSP signal processor, the speakers systems can greatly diminish the possibility of damage caused by overloading. In addition, limiter circuit is adopted to protect the tweeters as well as to control the output power of the loudspeakers. In application, the system can save a lot of cable for connection, which enables convenient installation and reduces the signal wasting during transmission. The damping factor of the amplifier is boost up as well. The end users will no longer face those problems as power matches, sensitivity matches or frequency cutting point selection between amplifier and speaker.

【Key words】: active speakers system, ambulatory performance, loudspeaker line array

 

扬声器非线性的几种数字补偿方法

董校庭

（深圳东原电子有限公司，广东 深圳 518108）

 

【摘要】 本文对扬声器非线性的数字补偿方法做了文献综述，扼要介绍分析了该领域研究人员所采用过的五种主要方法。并对扬声器非线性数字处理方法的应用前景作了一些展望。

关键词 扬声器 非线性 补偿 数字处理

Digital Compensation Methods for the Nonliearity in Loudspeakers

DONG Xiao-ting†

( Dongyuan Electronics Co., Ltd. Shenzhen, Guangdong, 518108, China)

 

【Abstract】: This article is a synthesis review on the digital compensation methods for the nonlinearity in loudspeakers. A brief introduction and analysis is given to the five main approaches which had been adopted by the researchers in this field. And the brilliant prospects of DSP application on the loudspeaker nonlinear compensation is peeked into.

Key words: Loudspeaker, Nonlinear, Compensation, Digital Signal Processing

四阶带通式无源辐射器扬声器系统。

卢斯荣

深圳市律和声频科技有限公司 518067

【摘要】本文分析了用无源辐射器来作为四阶带通式扬声器系统的低频辐射器的扬声器系统，对其系统函数加以分析，提出了具体的设计方法，并各相关参数的影响加以分析和讨论。

 

我可能去不了，这个论文到时看看怎么回事？不是很相信哪

看来偶是可以免费去看大师们的风采了．

好机会哦!

好啊,支持一下

哎

没机会去哦!!!!!!!!