A mathematical profound mystery of Chinese word tone & frequency change proportion 3:2

汉语 四声的数学奥秘& 频率 变比3∶2

In this part the thesis at first studies on the iterative Fourier interpolation algorithms for estimation of single tone frequency .

研究了基于迭代傅立叶插值的单 频估计算法，并给出了该算法的广义形式。

By adopting the technologies above it is feasible to integrate frequency response measurement TDR measurement noise measurement discrete multiple tone frequency modulation DMM and all other functions in one instrument .

使得在一台仪表内综合了频响测量、时域反射测量、噪声测量、离散多 音频调制测量和DMM测量等功能。

Human hearing to complex tone is called dynamic audio frequency domain .

作者把听觉对 复音 的 响应频域称为动态声 频域。

Objective : To analyse the relationship of distortion product otoacoustic emissions ( DPOAE ) conventional pure tone audiometry and expanded high frequency audiometry and discuss the originated mechanism of DPOAE and value in early diagnosis and detection noise induced deafness .

目的：分析畸变产物耳声发射（DPOAE）和常 频 纯音测听、扩展 高频测听的关系，借以探讨DPOAE的产生机制以及在噪声性听力损伤的监测和早期诊断中的应用价值。

Result : All these cases had following contradictory phenomena : Pure tone audiograms were low frequency hearing loss ;

结果：本组病例具有下列矛盾现象： 主诉进行性 听力减退，尤其听不清语言；

For Mandarin-Chinese tone recognition the lowpass cutoff frequency required for asymptotic performance was 256 Hz much higher than that required for English phoneme recognition .

汉语四 声的识别需要 256Hz的低通截止 频率才达到平台成绩，这一频率比英语音素识别所需的时域信息高得多。

A small pipe sounding a tone of standard frequency ; used to establish the starting pitch for unaccompanied singing .

发出标准 音频的小管；用来建立清唱时的起 音。

The make up principle and software design of a multi loop DTMF ( dual tone multi frequency ) communication circuit based on STD bus is described which with STD module can be used as star type distributed remote data communication system .

介绍一种基于STD总线的多路DTMF（双 音多 频）通信电路的构成、工作原理及软件设计。

First a low frequency tone is up-converted to the needed frequency range by means of SSB ( single side band modulation ) .

其思路是将信号先通过 单边带调制，将较低频率调制到需要的 频率范围；

The main characteristic of tone is fundamental frequency F0 and the effective approach to make use of tone information is to abstract and analyze F0 accurately .

而 体现 声调的最主要的特征就是 声调 的 基频FO，有效的利用声调信息，必须对基频FO进行准确的提取与分析。

Result & Conclusion : ① Three types of tone bursts may evoke similar frequency specific ABR when stimulus intensity was lower than 70 dB nHL for 1 kHz and any intensity for 2 4 kHz .

结果与结论：①4、2kHz各刺激声强及1kHz70dBnHL以下声强时，3种不同条件短 纯音有着相同的 频率特异性；

The results show that the impinging tone dominates the discrete frequency noise with short impinging distances .

结果表明：对于凹、凸、平三种形状的冲击面，当冲击距离较小时，冲击 单音主导了离散 频率噪声；

As an appurtenance of telephone this remote alarm equipment is used to be an alarm for private house protect based on the transmission of DTMF ( Dual Tone Multiple frequency ) .

本文设计的电话远程报警器是基于DTMF（双 音 双频 信号）传输、作为电话的附属物而开发的家庭远程报警系统。

Obvious evolutions occur both in acoustic waveform and in basic tone frquency of guai and it is a vari-toned sound with the dominant basic tone frequency at about 2100 Hz and 2800 Hz .

guái的波形和主音频呈明显的演变，优势 主频约 2100Hz和2800Hz的变音调 声。

The playing sound of guitar will persist a long time and provide chord tone when the natural frequency of guitar structure couples well with that of the strings .

当琴身结构固有 振动 频率与琴弦 振动 频率耦合时，弦 振声易产生声波持续时间长、且具有和弦 音的效果。

Initially pitch is considered to be the frequency of signal ; this view is supported by the function of frequency analysis of auditory periphery but fail to explain pitch perception of complex tone contained multiple frequency components .

最初音调被认为是信号的频率，这一观点得到了听觉外周的频率分析功能的支持，但是并不能解释包含多个 频率成分的复杂 音所引起的音调感知现象。

The characteristic of enlarged vestibular aqueducts syndrome in pure tone audiometry : low frequency air-bone gap

前庭水管扩大患儿 纯音听力特征性表现& 低频骨气导差

Under the premise of getting the initial tone frequency by delay-phase multiplication this paper combine optimum seeking method and the fractional Fourier transform to improve the precision of parameter estimation and reduce the amount of search operation .

提出在利用延时相乘法得到LFM信号的初始 调 频率的前提下，将优选法和分数阶Fourier变换相结合来提高参数估计的精度以及减少搜索的运算量。

A Dual Tone Multi frequency Receiver Using ADSP 2100 Family

采用ADSP－2100系列的双 音多 频信号接收器

A kind of multi functional tone frequency signal acquisition and processing system which is composed of 386 microcomputer and data acquisition card is reported . The design of hardware and software are described .

开发了由386微机和数据采集卡组成的多用途 音频信号采集与处理系统，其内容包括硬件设计和软件设计。

That is it generates one pure tone or frequency at a time .

它可以每次产生一个 纯音或者 频率。

Auditory brainstem responses to tone pips on frequency specificity

菱形 短音诱发听觉脑干反应 频率特性的探讨

Objective : This study investigated and compared the effects of tone burst in three different conditions ( linear gated tone burst linear gated tone burst in broadband noise masking and Blackman gated tone burst ) on the frequency specificity of ABR .

目的：观察比较线性窗短纯音、加宽频带噪声掩蔽的线性窗短纯音及Blackman窗门控短 纯音对听性脑干反应（ABR） 频率特异性的影响。

Objective To study the influences of target tone recognition task on dominant frequency fluctuation structure of EEG .

目的研究靶 音识别作业对脑波α 段 频率涨落特征的影响及各优势成分的作业相关变化。

Body divided sub-degree situation tone scope time frequency of six chapters each chapter select the number of frequently used adverbs description .

正文部分分程度、情状、 语气、范围、时间、 频度六大章，每一章选取几个使用频率较高的副词进行描写。

Influence of Target - tone Recognition Task on α - band Frequency Fluctuation Characteristics in EEG

靶 音识别作业对脑波α段 频率涨落特征的影响