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Description: 将输入A律PCM编码器的正弦信号采样,进行PCM编码，求出编码器的输出码组序列。-legal importation A PCM encoder sinusoidal signal sampling, PCM coding, coding obtained the output code sequence.
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Size: 28945 |
Author: 刘奇 |
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Description: 这个是用MATLAB中的SIMULINK做成的PCM编码器。-This is the MATLAB SIMULINK caused by the PCM encoder.
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Size: 3378 |
Author: liufang |
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Description: 一个语音压缩的C语音源代码，把模拟声音信号通过数字转换为PCM编码-a voice compression voice of C source code, analog voice signals into digital PCM encoder
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Size: 136132 |
Author: 张 |
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Description: 一个语音压缩的C语音源代码，把模拟声音信号通过数字转换为PCM编码-a voice compression voice of C source code, analog voice signals into digital PCM encoder
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Size: 136192 |
Author: 张 |
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Description: 将输入A律PCM编码器的正弦信号采样,进行PCM编码，求出编码器的输出码组序列。-legal importation A PCM encoder sinusoidal signal sampling, PCM coding, coding obtained the output code sequence.
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Size: 28672 |
Author: 刘奇 |
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Description: 这个是用MATLAB中的SIMULINK做成的PCM编码器。-This is the MATLAB SIMULINK caused by the PCM encoder.
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Size: 3072 |
Author: liufang |
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Description: 这个是用MATLAB中的SIMULINK做成的PCM编码器,使用MATLAB实现PCM编码和解码.-This is in SIMULINK with MATLAB made PCM encoder, the use of MATLAB realize PCM encoding and decoding.
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Size: 3072 |
Author: lijunjie |
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Description: pcm编码信号的仿真，对学习pcm编码的人 有很大的好处-pcm encoder signal simulation, learning pcm encoded who have considerable benefits
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Size: 1024 |
Author: 郑东浩 |
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Description: PCM编码器：实现每秒8000取样。保存为EXCEL和TXT文件-PCM encoder: 8000 samples per second realize. EXCEL and save it as TXT file
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Size: 5658624 |
Author: 赵伟 |
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Description: AT91SAM7S64处理器的USB驱动、AD驱动、Flash驱动的项目源代码，并且添加了PCM实时编码代码，实现了实时录音与U盘功能。-USB drive AT91SAM7S64 processor, AD-driven, Flash-driven project source code, and added a real-time encoder PCM code, realize the real-time recording and U disk function.
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Size: 613376 |
Author: 姚坤 |
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Description: PCM encoder using MATLAB
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Size: 1024 |
Author: val |
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Description: 基于 STM32 PCM语音编/解码代码，代替硬件录播IC-Based on the STM32 PCM voice encoder/decoder code, instead of recording and broadcasting hardware IC
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Size: 475136 |
Author: fox |
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Description: 采用13折线A率的PCM编码,逐次反馈型编码器。-A broken line 13 the rate of use of PCM encoding, successive feedback encoder.
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Size: 655360 |
Author: 军 |
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Description: 基于MATLAB的pcm编码系统的仿真系统，是用simulink搭建的。-pcm encoder basic on MATLAB~
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Size: 605184 |
Author: nancy |
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Description: Implementation of a speech codec based on coding of speech at 8 kbit/s
using conjugate-structure algebraic-code-excited linear-prediction (CS-ACELP)
- We took .wav files that is sampled at 8000 Hz using 16-bit linear PCM. The encoding process is done every 10ms frame or 80 samples. For the preprocessing stage, the samples are high passed with cut-off frequency of 140 Hz and scaled down by 2. A total of 240 samples are buffer for windowing and autocorrelation computation. The autocorrelation coefficients are used to calculate the LP filter coefficients using the Levinson-Durbin algorithm. The LP filter coefficients are converted to Line Spectral Pair (LSP) coefficients. LSP coefficients are converted back to the LP filter coefficients, which is just the reverse process of the conversion from LP to LSP. This module is exactly what the decoder will need in order to convert the LSP coefficients to LP coefficients. We decided not to implement the LSF quantization module because we did not have the codebook information when we designed our system.
The open-loop pitch delay is calculated first for each frame. Then the closed-loop pitch
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Size: 40960 |
Author: coco |
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Description: 脉冲编码调制(PCM)实现
编程实现PCM技术的三个过程：采样、量化与编码。
采样：低通连续信号采样，以 x=sin(200*t) m=x./(200*t) m=m.*m 为例说明低通采样定理，绘出信号时、频图形；带通连续信号采样，以x=sin(20*t) m=x./t 为例说明带通采样定理，绘出信号时、频图形。
量化：均匀量化，以幅度 的正弦信号为例实现为64级电平的均匀量化；非均匀量化，输入A律PCM编码器的正弦信号 ，采样序列为 ，将其进行PCM编码，给出编码器的输出码组序列
编码：以上述信号为例，实现A律的13折线近似法及国际标准PCM对数A律量化编码。-Pulse code modulation (PCM) to achieve
PCM technology programming three processes: sampling, quantization and coding.
Sample: low-pass continuous signal sampling to x = sin (200* t) m = x./(200* t) m = m.* m an example low-pass sampling theorem, draw the signal, frequency graphics bandpass sampling continuous signals to x = sin (20* t) m = x./t an example bandpass sampling theorem, draw the signal, frequency graph.
Quantization: uniform quantization, in order to realize the magnitude of sinusoidal signal as an example for the 64 level uniform quantization non-uniform quantization, input A law PCM encoder sine signal, the sampling sequence, to be PCM encoded, the encoder is given The output code sequence
Code: A Case Study of the signal to achieve the 13 A line approximation law and international standards on the number of A law PCM coding quantization.
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Size: 2048 |
Author: 马芳 |
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Description: G.711使用64Kbps的带宽，可将14bits转换成8bits。目前G.711有两个编码方式，A-law以及Mu-law。-G.711 defines two main compression algorithms, the µ -law algorithm (used in North America & Japan) and A-law algorithm (used in Europe and the rest of the world). Both are logarithmic, but A-law was specifically designed to be simpler for a computer to process. The standard also defines a sequence of repeating code values which defines the power level of 0 dB.
The µ -law and A-law algorithms encode 14-bit and 13-bit signed linear PCM samples (respectively) to logarithmic 8-bit samples. Thus, the G.711 encoder will create a 64 kbit/s bitstream for a signal sampled at 8 kHz.[5]
G.711 μ-law tends to give more resolution to higher range signals while G.711 A-law provides more quantization levels at lower signal levels. When using μ-law G.711 in networks where suppression of the all 0 character signal is required, the character signal corresponding to negative input values between decision values numbers 127 and 128 should be 00000010 and the value at the decoder output is-
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Size: 915456 |
Author: coco |
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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.
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Size: 954368 |
Author: tanii |
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Description: pcm编码，pcm编码 pcm编码 pcm编码 -pcm coding, pcm encoder pcm encoder pcm encoder pcm encoder pcm encoder pcm encoder
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Size: 2048 |
Author: 杨良龙 |
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Description: 律u律pcm编码
若输入A律PCM编码器的正弦信号为x(t)=sin(1600πt),采样序列为x(n)=sin(0.2πn),n=0,1,2,…,10，将其进行PCM编码，求出编码器的输出码组序列y(n)。
要求：1) 直接采用A律扩展器函数求解上述问题。
2）使用13折线法近似A律PCM 求解上述问题。
3）计算量化误差。-Law a law pcm coding
If the input A-law PCM encoder is sinusoidal signal x (t) = sin (1600πt), for the sample sequence x (n) = sin (0.2πn), n = 0,1,2, ..., 10, it will be PCM coding to obtain the coded output code group sequence y (n).
Requirements: 1) directly A-law expander function to solve the above problems.
2) using a 13 fold line approximation A-law PCM to solve the above problems.
3) calculating the quantization error.
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Size: 28672 |
Author: 高山 |
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