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Description: E1 Framer/Deframer,E1 framer Deframer core implements CCITT (ITU) recommedations G.704,G.706 and G.732 for 30 channel multiplexed E1 stream at 2.048Mbps rate.
Note:This project is part of the OpenStacks initiative at the Telecom Software Laboratory, Electrical Engineering Department / Bharti School of Telecommunication Technology & Management. The initiative is founded and led by Dr.Subrat Kar (subrat@ee.iitd.ac.in) at the Department of Electrical Engineering, IIT Delhi-E1 Framer/Deframer, E1 framer Deframer core implements CCITT (ITU) recommedations G.704, G.706 and G.732 for 30 channel multiplexed E1 stream at 2.048Mbps rate. Note: This project is part of the OpenStacks initiative at the Telecom Software Laboratory, Electrical Engineering Department/Bharti School of Telecommunication Technology & Management. The initiative is founded and led by Dr.Subrat Kar (subrat@ee.iitd.ac.in) at the Department of Electrical Engineering, IIT Delhi
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Size: 139264 |
Author: xiao |
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Description: CCITT recommendation Digital Compression and Coding of Continuous-tone Still images-CCITT recommendation on Digital Compression and Coding of Continuous-tone Still images
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Size: 968704 |
Author: JP |
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Description: Calculate CRC-8 Values. Uses The CCITT-8 Polynomial, Expressed As
X^8 + X^5 + X^4 + 1
-Calculate CRC-8 Values. Uses The CCITT-8 Polynomial, Expressed As
X^8+ X^5+ X^4+ 1
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Size: 7168 |
Author: milind |
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Description: 循环冗余校验 CRC 的算法分析和程序实现。通信的目的是要把信息及时可靠地传送给对方，因此要求一个通信系统传输消息必须可靠与快速，在数字通信系统中可靠与快速往往是一对矛盾。为了解决可靠性，通信系统都采用了差错控制。本文详细介绍了循环冗余校验CRC（Cyclic Redundancy Check）的差错控制原理及其算法实现-Cyclic Redundancy Check
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Size: 106496 |
Author: 朱红 |
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Description: 数字基带信号的传输是数字通信系统的重要组成部分。在数字通信中，有些场合可不经过载波调制和解调过程，而对基带信号进行直接传输。采用AMI码的信号交替反转，有可能出现四连零现象，这不利于接收端的定时信号提取。而HDB3码因其无直流成份、低频成份少和连0个数最多不超过三个等特点，而对定时信号的恢复十分有利，并已成为CCITT协会推荐使用的基带传输码型之一。为此，本文利用VHDL语言对数据传输系统中的HDB3编码器进行了设计。
基于达到达到达到的信号发生器的源程序-Digital baseband signal transmission is a digital communications system, an important component. In digital communication, there are some occasions, may from time through the carrier modulation and demodulation process, the base-band signal for direct transmission. AMI code signal using alternating inversion, there may be four to zero with the phenomenon, which is not conducive to the receiving end of the timing signal extraction. The HDB3 code because of its non-DC components, low-frequency components, and even a small number of 0 up to more than three characteristics, while the timing signal recovery is very favorable, and has become CCITT Association recommended one of baseband transmission pattern. In this paper the use of VHDL language for data transmission system in the HDB3 encoder has been designed. Based on the signal generator to achieve to reach to reach the source
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Size: 3072 |
Author: 成风 |
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Description: MPEG, CCITT H.261 (P*64), JPEG
Image and Image sequence compression/decompression C software engines.
The Portable Video Research Group at Stanford have developed
image/image sequence compression and decompression engines (codecs)
for MPEG, CCITT H.261, and JPEG. The primary goal of these codecs is
to provide the functionality - these codecs are not optimized for
speed, rather completeness, and some of the code is kludgey.
Development of MPEG, P64, and JPEG engines has not been the primary
goal of the Portable Video Research Group. Our research has been
focused on software and hardware for portable wireless digital video
communication. The charter of this group ended in the summer of 1994.-MPEG, CCITT H.261 (P*64), JPEG
Image and Image sequence compression/decompression C software engines.
The Portable Video Research Group at Stanford have developed
image/image sequence compression and decompression engines (codecs)
for MPEG, CCITT H.261, and JPEG. The primary goal of these codecs is
to provide the functionality - these codecs are not optimized for
speed, rather completeness, and some of the code is kludgey.
Development of MPEG, P64, and JPEG engines has not been the primary
goal of the Portable Video Research Group. Our research has been
focused on software and hardware for portable wireless digital video
communication. The charter of this group ended in the summer of 1994.
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Size: 173056 |
Author: Mic |
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Description: MPEG, CCITT H.261 (P*64), JPEG
Image and Image sequence compression/decompression C software engines.
The Portable Video Research Group at Stanford have developed
image/image sequence compression and decompression engines (codecs)
for MPEG, CCITT H.261, and JPEG. The primary goal of these codecs is
to provide the functionality - these codecs are not optimized for
speed, rather completeness, and some of the code is kludgey.
Development of MPEG, P64, and JPEG engines has not been the primary
goal of the Portable Video Research Group. Our research has been
focused on software and hardware for portable wireless digital video
communication. The charter of this group ended in the summer of 1994.
-MPEG, CCITT H.261 (P*64), JPEG
Image and Image sequence compression/decompression C software engines.
The Portable Video Research Group at Stanford have developed
image/image sequence compression and decompression engines (codecs)
for MPEG, CCITT H.261, and JPEG. The primary goal of these codecs is
to provide the functionality - these codecs are not optimized for
speed, rather completeness, and some of the code is kludgey.
Development of MPEG, P64, and JPEG engines has not been the primary
goal of the Portable Video Research Group. Our research has been
focused on software and hardware for portable wireless digital video
communication. The charter of this group ended in the summer of 1994.
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Size: 339968 |
Author: Mic |
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Description: 7 号信令的特点是：信令速度快，具有提供大量信令的潜力，具有改变和增加信令的灵活性，便于开放新业务，在通话时可以随意处理信令，成本低。目前得到广泛应用。CCITT 自1980年提出7 号信令黄皮书，先后多次修正，至1993 年提出白皮书。
中国7 号信令规范于1990 年8 月实施，该规范是以CCITT 于1988 年颁布的蓝皮书为参考制订的，只在电话网中使用，即只采用了消息传递部分（MTP）和电话用户部分（TUP）
-SS7 is characterized by: signaling speed, has the potential to provide a large number of signaling, signaling a change and increase the flexibility, ease of opening up new business, can dispose of the call signaling, and low cost. Now widely used. Since CCITT SS7 1980, Yellow Book, has repeatedly amended to make the White Paper in 1993. China SS7 specification implemented in August 1990, the specification is based on CCITT Blue Book issued in 1988 as the reference set, only the use of the telephone network, that is only used message transfer part (MTP) and the Telephone User Part (TUP)
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Size: 111616 |
Author: hongjun |
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Description: 实用的RS232串口通信及CRC校验源码，计算LRC.CRC余式表 CRC-CCI-RS232 serial communication and practical source CRC checksum calculated LRC.CRC remainder table CRC-CCITT
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Size: 1024 |
Author: Oscar |
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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
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Size: 12288 |
Author: 李小勇 |
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Description: CRC校验C语言实现,CRC(Cyclic Redundancy Check)校验应用较为广泛，以前为了处理简单，在程序中大多数采用LRC(Longitudinal Redundancy Check)校验，LRC校验很好理解，编程实现简单。用了一天时间研究了CRC的C语言实现，理解和掌握了基本原理和C语言编程。结合自己的理解简单写下来。-CRC, C language, CRC (Cyclic Redundancy Check) verification is widely used, previous to deal with simple procedure in most cases, in the LRC (Longitudinal Redundancy Check) checksum, LRC check a good understanding of programming simple. With the day of the CRC of the C language, to understand and master the basic principles and C language programming. In conjunction with their understanding of simple writing.
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Size: 4096 |
Author: xiangyunl |
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Description: The primary purpose of this book is to explain various data-compression techniques using the C
programming language. Data compression seeks to reduce the number of bits used to store or transmit information. It encompasses a wide variety of software and hardware compression
techniques which can be so unlike one another that they have little in common except that they
compress data. The LZW algorithm used in the Compuserve GIF specification, for example, has
virtually nothing in common with the CCITT G.721 specification used to compress digitized voice
over phone lines.
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Size: 1534976 |
Author: Aoshi Hanate |
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Description: CRC校验实用程序库 在数据存储和数据通讯领域，为了保证数据的正确，就不得不采用检错的手段。在诸多检错手段中，CRC是最著名的一种。CRC的全称是循环冗余校验，其特点是:检错能力极强，开销小，易于用编码器及检测电路实现。从其检错能力来看，它所不能发现的错误的几率仅为0.0047 以下。-/* CRC.C——CRC程序库*/ #define CRCCCITT 0x1021 #define CCITT-REV 0x8408 #define CRC16 0x8005 #define CRC16-REV 0xA001 #define CRC32-POLYNOMIAL 0xEDB88320L
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Size: 2379776 |
Author: yang_yinxia |
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Description: 由于altera公司的CRC生成和校验模块不支持本系统使用的Cyclone IV E系列FPGA，因此本文独立设计了CRC模块。该模块的接口与altera公司的CRC模块接口基本一致，能够对16位输入的数据流进行CRC校验码生成和校验。本文采用CRC-CCITT生成项，其表达式为：X16+X12+X5+X0。本模块需要startp信号及endp信号指示数据传输的起始及结束。本模块采用状态机设计，对于数据头和数据尾分别由不同的状态来处理。在本模块中，使用了for循环，这会消耗较多的FPGA资源，但暂时任未发现其他改进的方法。-Because altera company' s CRC generation and checking modules do not support the use of the system Cyclone IV E series FPGA, so this independent design of the CRC module. The module' s interface with the CRC module interface altera' s basically the same, capable of 16-bit input data stream of CRC generation and checking. In this paper, CRC-CCITT generation entry, its expression is: X16+ X12+ X5+ X0. This module requires startp signal and endp signal indicating the start and end of data transmission. This module is a state machine design, and data for the end of the first data were handled by different states. In this module, use the for loop, which consumes more FPGA resources, but temporarily did not find any other ways to improve.
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Size: 4096 |
Author: 陈建 |
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Description: 详细介绍了循环冗余校验 CRC（Cyclic Redundancy Check）的差错控制原理及其算法实
现。 -Details of the cyclic redundancy check CRC (Cyclic Redundancy Check) error control principle and algorithm.
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Size: 106496 |
Author: 李为 |
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Description: CRC-CCITT码实现，即（k，k+16）码实现算法-CRC-CCITT code to achieve, namely (k, k+16) code algorithm
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Size: 27648 |
Author: 高元媛 |
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Description: audio codedcs: g.726
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Size: 33792 |
Author: amer |
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Description: 通常的CRC算法在计算一个数据段的CRC值时，其CRC值是由求解每个数值的CRC值的和对CRC寄存器的值反复更新而得到的。这样，求解CRC的速度较慢。通过-#define CRCCCITT 0x1021
#define CCITT-REV 0x8408
#define CRC16 0x8005
#define CRC16-REV 0xA001
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Size: 34816 |
Author: malimin |
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Description: 本文主要介绍CCITT v.42bis建议的压缩算法的主要特点，以及实现该算法的数据结构，形成新串的方法，动态维护字典的方法和指针编码，并给出V.42bis建立的模拟结果。V.42压缩可以用于SNDCP子层分组数据部分的压缩。-This paper describes the main features recommended by the CCITT v.42bis compression algorithm, and the data structure of the algorithm, to form a new string method, the dynamic maintenance of the dictionary and the pointer encoding, and gives the V.42bis established simulation results. V.42 compression can be used for part of the SNDCP sublayer packet data compression.
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Size: 358400 |
Author: 曾秀姗 |
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Description: CRC16校验码计算器 CRC16Calculater.exe支持CRC-16-IBM和-CRC-16-CCI-CRC16 checksum calculator CRC16Calculater.exe support of CRC-16-IBM-CRC-16-the CCITT
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Size: 7162880 |
Author: KKK |
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