digital data analog signal ppt

Ngày tải lên: 19/01/2014, 20:20

Ngày tải lên: 31/03/2014, 18:20

Ngày tải lên: 10/07/2014, 17:20

Ngày tải lên: 29/09/2013, 20:20

... Digital Signal Source: The signal sources produce a series of “0”s (about –2.5 V) and “1”s (+2.5 V) at the data rate set by the Master Clock. The time period of each bit is T = 1/fs. This signal ... detection process. This signal is useful in accurately measuring errors in detected data due to a communications channel. Figure 5 A (b) Block parameters digital signal source Summer: Page ... signal source produces equally likely 0’s and 1’s. Figure 5 A (d) Block parameters limiter Error Detector: The processed signal is compared with a sample of the signal source. For each data...

Ngày tải lên: 19/10/2013, 17:15

... output of the digital summer as well as that of the Digital Signal Source was observed on the oscilloscope. The graphs are as shown. It is seen that there is no change in the output signal when ... : A. Actual FSK systems use “continuos phase” signals wherein one signal starts where the other signal stops. A VCO is used to generate such signals. Figure 6D (a)FSK using Phase lock ... begins at the start of every data period and proceeds at the frequency fx until the end of the data period. Then the process repeats. Figure 6c The FSk Modulated signal B. Cross –...

Ngày tải lên: 23/10/2013, 15:15

... Designing a User Data Management Strategy 3 Determining Current User Data Environment ? ? ? What Is User Data? What Is User Data? ? ? ? Which User Data Is Currently Stored? Which User Data Is Currently ... a User Data Management Strategy    Determining Current User Data Strategies  Determining Current User Data Environment  Determining Current User Data Management Methods Data Users Users ... User Data Currently Stored? Where Is User Data Currently Stored? ? ? ? What Is the Current Use of Offline Data? What Is the Current Use of Offline Data? ? ? ? What Is the Current Use of Roaming Data? What...

Ngày tải lên: 10/12/2013, 15:15

... nature of a data island. ! Describe how to use Data Source Objects (DSO) to display XML data islands in an HTML page. ! Create an XML data island in an HTML file. ! Bind XML data to HTML ... 5: Embedding XML Data in HTML # ## # Using Data in Web Browsers ! Delivering Data from the Web Server ! Using Client-Side Data Source Objects (DSO) ! Presentation vs. Data ! Internet Explorer ... Objects, and DHTML data binding simplify data access and presentation on the Web. Slide Objective To introduce the concept of data access and data- aware Web pages. Lead-in Data access is now...

Ngày tải lên: 10/12/2013, 16:16

... EIA-530 Digital Patching Control Platform www.adc.com • +1-952-938-8080 • 1-800-366-3891 The PatchMate digital control platform provides a convenient, organized, and secure method of digital communication ... of ADC's global sales office locations, please refer to our web site. PatchMate ™ EIA-530 Digital Patching Control Platform Description Modules Patch module with LEDs PMM-614001 – Rear/top ... 9/02 • 528 PatchMate ™ 3 PatchMate ™ EIA-530 Digital Patching Control Platform www.adc.com • +1-952-938-8080 • 1-800-366-3891 EIA-530 Modules...

Ngày tải lên: 10/12/2013, 17:15

... BASED DATA MINING TECHNIQUES The objective of data mining is to extract valuable information from one’s data, to discover the ‘hidden gold’. In Decision Support Management terminology, data mining ... one search for patterns of information in data (Parsaye, 1997). Figure 2: Rule Induction process Data mining techniques are based on data retention and data distillation. Rule induction models ... rule induction data mining. Furthermore, it is examined whether the implementation of the two methodologies may offer a solution to the problem of missing data, in the initial data set. KEYWORDS:...

Ngày tải lên: 11/12/2013, 23:15

... cycle 1 2 3 4 5 6 7 T 8 T 9 T 10 T 11 T 12 Error Snoop Resp Data Req Error Snoop Resp Data Req Error Snoop Resp Data Resp Req Error Snoop Resp Data Req Error Snoop Data Req Error Snoop Resp Data Req Error Snoop Resp Data Figure 3-45. ... II CPU Bus arbitration Request Data Snoop Error Φ Figure 3-44. Logical pinout of the Pentium II. Names in upper case are the official Intel names for individual signals. Names in mixed case are groups of related signals ... gates. Typical Micro- Processor Symbol for electrical ground Symbol for clock signal Bus arbitrationAddressing Coprocessor Status MiscellaneousInterrupts Bus control Power is 5volts +5v Data Φ Figure 3-33. The logical pinout of...

Ngày tải lên: 12/12/2013, 09:15

... will be stored. All other database objects will refer to the tables in your database for data, whether asking questions of the data or creating reports based on the data. This section covers ... limitation. This is not to say that Access has unlimited data storage capabilities. Every bit of data causes the Access database to grow in file size. An Access database has a file size limitation of 2 gigabytes. ... querying data to get fast results, but it’s important to understand the basics of the relational database concept before pounding away at data. A good understanding of how a relational database...

Ngày tải lên: 13/12/2013, 03:15

... chemicals. WHY GO DIGITAL? Once captured, digital photographs are already in a format that makes them incredibly easy to distribute and use. For example, you can insert digital photographs ... large-screen TV. Digital photography is instant photography without the film costs! If you're considering going digital, here are a few more reasons to get even more serious. - Going digital ... processed. (Or wasting unexposed film when you can't wait.) Digital cameras are becoming more than just cameras. Some digital cameras are capable of capturing not only still photographs,...

Ngày tải lên: 13/12/2013, 23:15

... link in the chain. The key element in digital photography is an image in a digital format made up pixels. Although a digital camera captures photos in this digital format, you can also scan slides, ... steps of digital photography Digital cameras are just one link in a long chain leading from the original scene through to the final image that you display or distribute. In fact, a digital ... same digital format. To understand how the camera fits in with other parts of the digital photography system, it helps to understand the three basic steps involved in creating and using digital...

Ngày tải lên: 13/12/2013, 23:15

Ngày tải lên: 14/12/2013, 14:15

... watermark. 2 Huffman Coding Huffman coding is a popular method for compressing data with variable-length codes. Given a set of data symbols (an alphabet) and their frequencies of occurrence (or, equiv- alently, ... the compressed data on a file, the variance of the code makes no difference. A small-variance Huffman code is preferable only in cases where the encoder transmits the compressed data, as it is being ... starts with a special header indicating mode 1, followed by the length LEN of the data, followed by LEN bytes of literal data. Notice that the maximum value of LEN is 65,535. 2. Compression with fixed...

Ngày tải lên: 14/12/2013, 15:15

... which makes it so useful in data compression, is that it takes correlated input data and concentrates its energy in just the first few transform coefficients. If the input data consists of correlated ... the quantized coefficients. This results in data items that are not identical to the original ones but are not much different. In practical applications, the data to be compressed is partitioned into ... as 3, 4, or 6 result in many small sets of data items. Such a small set is transformed to a small set of coefficients where the energy of the original data is concentrated in a few coefficients, but...

Ngày tải lên: 14/12/2013, 15:15

... eye is therefore similar to a digital camera. Once we realize this, we naturally want to compare the resolution of the eye to that of a modern digital camera. Current digital cameras have from 500,000 ... for the entire 64-pixel data unit is the 46-bit number 1111111111100111010001001101101110111010101010. These 46 bits encode one color component of the 64 pixels of a data unit. Let’s assume that ... set of basis images that have higher and higher frequencies. Given a data vector, the DCT separates the frequencies in the data and represents the vector as a linear combination (or a weighted sum)...

Ngày tải lên: 14/12/2013, 15:15

... used to compress data that has been digitized from an analog source, such as sampled sound and scanned images (drawings or photographs). Such data is called digitally sampled analog data (DSAD). ... nine bits. Since the uncoded data requires just two bits (01 or 10), the compression ratio is 9/2=4.5 (the compressed data is 4.5 times bigger than the original data; a significant expansion). Please ... If the data to be compressed is in the form of large numbers, quantization is used to convert them to small numbers. This results in (lossy) compression. If the data to be compressed is analog...

Ngày tải lên: 14/12/2013, 15:15

... the values of the data. That means that we can do all the fitting in advance, for fictitious data consisting of all zeros except for a single 1, and then do the fits on the real data just by taking ... noisy data. The premise of data smoothing is that one is measuring a variable that is both slowly varying and also corrupted by random noise. Then it can sometimes be useful to replace each data ... relative widths and heights of spectral lines in noisy spectrometric data. Recall that a digital filter is applied to a series of equally spaced data values f i ≡ f(t i ), where t i ≡ t 0 + i∆ for some constant...

Ngày tải lên: 15/12/2013, 04:15