Description: • To design a GUI in MATLAB for Dual-Tone Multi-Frequency (DTMF) telephone key pad, including DTMF Signal generator and DTMF tone detector
• To simulate the DTMF signals with noise based on the specifications given.
• To decode and display the DTMF signals by using FFT algorithm
Platform: |
Size: 16675 |
Author:冯扬 |
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Description: 按照人名 电话号吗的格式建立电话本，再执行时把文件名作为参数。带有语音功能。-accordance with the names of persons telephone number? Format established telephone, and implementation of the document as a parameter. With voice. Platform: |
Size: 6281216 |
Author:杨玉 |
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Description: • To design a GUI in MATLAB for Dual-Tone Multi-Frequency (DTMF) telephone key pad, including DTMF Signal generator and DTMF tone detector
• To simulate the DTMF signals with noise based on the specifications given.
• To decode and display the DTMF signals by using FFT algorithm
Platform: |
Size: 16384 |
Author:冯扬 |
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Description: 本文主要阐述了DTMF的原理及如何在MATLAB上产生DTMF信号，主要涉及到电话拨号音合成的基本原理及识别的主要方法，利用 MATLAB 软件以及 FFT 算法实现对电话通信系统中拨号音的合成与识别。并进一步利用 MATLAB 中的图形用户界面 GUI 制作简单直观的模拟界面。 能够利用矩阵不同的基频合成 0 － 9 不同按键的拨号音，并能够对不同的拨号音加以正确的识别，实现由拨号音解析出电话号码的过程，完成对电话拨号音系统的简单的实验仿真。-This paper described the principle and how DTMF in MATLAB to generate DTMF signals, mainly related to the telephone dial tone of the basic principles of synthesis and identification of the main methods, the use of MATLAB software and the FFT algorithm on the telephone communication system dial tone Synthesis and Recognition . And further the use of MATLAB in the production of graphical user interface simple and intuitive GUI interface simulation. Able to take advantage of matrix synthesis of different fundamental frequency 0- 9 different keys of the dial tone and be able to different dial tone to be the correct identification, the dial tone from a telephone number to resolve the process of completion of the telephone dial tone system, a simple experiment simulation. Platform: |
Size: 4096 |
Author:冯扬 |
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Description: DTMF(双音多频)是用两个特定的单音频组合信号来代表数字信号的一种编码技术。两个单音的频率不同，代表的数字或实现的功能也不同。可采用8种频率代表电话机上的16个按键，10个数字键0~9和6个功能键*、#、A、B、C、D。具体的频率组合见参考书。要求：
(1) 根据键盘输入的符号，利用MATLAB产生对应的DTMF信号；(2) 分别利用FFT算法和Goertzel算法计算该DTMF信号的频谱并画出频谱图；(3) 根据频谱图确定DTMF信号所代表的符号是否和输入的符号一致。
-DTMF (Dual Tone Multi-Frequency) is a single with two specific combination of audio signals to represent a kind of digital signal coding techniques. Two monosyllabic different frequency, on behalf of the numbers, or the realization of the functions are also different. Eight kinds of frequency of use on behalf of telephone on the 16 keys, 10 numeric keys 0 ~ 9 and 6 function keys*,#, A, B, C, D. The frequency of specific composition of reference books. Requirements: (1) According to the keyboard input of symbols, the use of MATLAB have a corresponding DTMF signal (2), respectively, using FFT algorithm and the Goertzel algorithm DTMF signal spectrum and frequency spectrum draw (3) According to DTMF signal frequency spectrum to determine represented by symbols and input symbols unanimously. Platform: |
Size: 15360 |
Author:wyyy |
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Description: Data hiding in the still image presets a variety of challenges that arises due to the way human visual system (HVS) works and the typical modifications that image undergoes. Additionally, still images priced a relatively small host signal in which to hide data. A fairly typical 8-bit picture of 200*200 pixels provides approximately 40 KB of data space in which to work. This is equivalent to around 5 seconds of telephone-quality audio or less than a single frame NTSC television. Platform: |
Size: 199680 |
Author:rupesh |
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Description: 双音多频 DTMF（ Dual Tone Multi-Frequency ）信号，是用两个特定的单
音频率信号的组合来代表数字或功能。在 DTMF 电话机中有 16 个按键，其中
10 个数字键 0 — 9 ， 6 个功能键 * 、 # 、 A 、 B 、 C 、 D 。其中 12
个按键是我们比较熟悉的按键，另外由第 4 列确定的按键作为保留，作为功能
键留为今后他用。 根据 CCITT 建议，国际上采用 697Hz 、 770Hz 、 852Hz 、
94lHz 低频群及 1209Hz 、 1336Hz 、 1477Hz 、 1633Hz 高频群。从低频群和高频群任意各抽出一种频率进行组合，共有 16 种组合，代表 16 种不同的数
字键或功能，每个按键唯一地由一组行频和列频组成-DTMF DTMF (Dual Tone Multi-Frequency) signal, is one of two specific
A combination of audio frequency signals to represent the number or function. In the DTMF telephone has 16 buttons, which
10 number keys 0- 9, 6 function keys*,#, A, B, C, D. 12 of them
Keys is more familiar with the keys, another set from the first four buttons as retention of a functional
Key left for future uses. According to CCITT recommendations, the international use of 697Hz, 770Hz, 852Hz,
94lHz low frequency group and 1209Hz, 1336Hz, 1477Hz, 1633Hz frequency group. From the low group and high-frequency group out of any one frequency for each combination, a total of 16 combinations, the number of representatives of 16 different
Character or function keys, each key uniquely by a group composed of row frequency and column frequency Platform: |
Size: 12288 |
Author:李小勇 |
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Description: 利用Matlab仿真脉冲编码调制（PCM）及A律、μ律PCM对声音进行压缩编解码过程。
脉冲编码调制（PCM，Pulse Code Modulation）是一种将模拟语音信号转换成数字信号的编码方式。波形编码器的作用是对采样后的信号样本进行量化和编码。从数学上来看，量化过程就是把一个连续幅度值的无限数集合映射成一个离散幅度值的有限数集合，编码就是用一组二进制数来表示这些映射后的有限数。国际标准化的PCM采用折叠二进制码，符合长途电话质量。根据量化方法的不同，PCM可分为均匀量化PCM和对数PCM两大类，对数PCM中，2Aμ律和律编码都已被定为国际标准。-Matlab simulation using pulse code modulation (PCM) and the A law, μ law PCM codec for voice compression process.
Pulse Code Modulation (PCM, Pulse Code Modulation) is an analog voice signal into digital signal encoding. The role of the encoder waveform is sampled signal sample quantization and coding. From the mathematical point of view, the process is to quantify the magnitude of the value of a continuous set of infinite number of maps into a finite number of discrete set of amplitude values , encoding is to use a set of binary digits, said after a limited number of these maps. By folding the International Standardization of PCM binary code, in line with long-distance telephone quality. According to the different quantitative methods, PCM can be divided into uniform quantization PCM PCM and the number of two categories, on the number of PCM in, 2Aμ law and legal codes have been designated as international standards. Platform: |
Size: 954368 |
Author:tanii |
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Description: 用matlab gui画信号的频谱图和时域图形,再画出语谱图，模拟电话-Picture signal with matlab gui frequency spectrum and time domain graph, then draw the language spectrum, analog telephone Platform: |
Size: 18432 |
Author:杨光 |
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Description: 用 听筒录取拨号音波形 利用matlab-fft算法识别所拨打的电话号码-To matlab-fft algorithm identifies the telephone number to call with a earpiece the admission dialing tone waveform Platform: |
Size: 1024 |
Author:童化金 |
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Description: 运用FFT技术来综合和分析电话拨号的过程，matlab来分解了这一过程，希望能提供帮助- TOUCHTONE Use FFT to synthesize and analyze telephone dialing
The dual tone multi-frequency (DTMF) standard specifies that the tone
generated by a button on a telephone key pad is the sum of two sinusoids,
with frequencies determined by the button s row and column.
The dial pad on the upper left allows you to select buttons and generate
the corresponding tones.
The signal plotted on the upper right is a recording of the FAX number
for the MathWorks being dialed. You can replay the entire signal, or
select individual segments. The power plot is the magnitude of the FFT
of the signal being played. What is the MathWorks FAX number? Platform: |
Size: 2048 |
Author:lipu |
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Description: 由于科学技术的飞速发展，使银行卡的使用范围不断扩大，因而出现银行卡用卡安全问题 。本文主要介绍了银行卡密码泄露漏洞，对利用录音设备对手机、电话等按键式密码输入终端进录音盗取银行卡密码的不法行为进行技术分析，利用MATLAB软件编程对按键式密码输入终端的按键音进行音频分析，基于短时能量和过零率对所采集的音频文件进行端点检测，提取出单个拨号音，然后对处理后的音频进行频谱分析、对比，从而识别按键式密码输入终端的按键音。-Due to the rapid development of science and technology, the use of bank cards continued to expand, and thus to a bank card with a card security issues. This paper describes the bank card password disclosure vulnerability on the use of recording equipment on the phone, telephone touchtone input terminal password into the recording steal bank card passwords wrongful conduct technical analysis using MATLAB software programming for touchtone input terminal password keys sound audio analysis, based on short-term energy and zero-crossing rate of the acquired endpoint detection audio files, extract single dial tone, and then processed audio spectrum analysis, comparison, to identify key touchtone input terminal password sound. Platform: |
Size: 4096 |
Author:张校非 |
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