chapter 4  first steps with digital electronics

... connection associated with that socket on a specified remote host and port The server uses the accept( ) call to intercept the incoming connection and initiate communication with the client Now ... applications must associate these characteristics with a newly created socket For example, in the following line, the SH file handle is associated with the newly created socket PF_INET indicates ... assigns $! with an error message Use die( ) after connect( ) to stop the program and report any errors Writing Data to a Network Connection To write to the file handle associated with the open...

Ngày tải lên: 20/10/2013, 10:15

... use strict; use Socket; # include Socket module require 'tcp.pl'; # file with Open_TCP routine require 'web.pl'; # file with parseURL routine use vars qw($opt_h $opt_H $opt_r $opt_d); use Getopt::Std; ... on to the web server you specify This allows you to things like HTML form postings with POST, or a file upload with PUT, and selectively look at the results At this point, it's really all up to ... use strict; use Socket; # include Socket module require 'tcp.pl'; # file with Open_TCP routine require 'web.pl'; # file with parseURL routine use vars qw($opt_h $opt_i $opt_l); use Getopt::Std;...

Ngày tải lên: 20/10/2013, 10:15

... Comparing this equation with (4.3.21), we have rˆ p a2 and y ˆ cosÀ1 …Àa1 =2r†: …4:3:24† The filter behaves as a digital resonator for r close to unity The system with a pair of complex-conjugated ... line with pole p1 …! ˆ y† The magnitude response has a peak at this resonant frequency The closer r is to the unity, the sharper the peak The digital resonator is an elementary bandpass filter with ... where i is an integer Thus the spectrum of a periodic signal with period N is a periodic sequence with the same period N The single period with frequency index k ˆ 0, 1, F F F , N À corresponds to...

Ngày tải lên: 23/10/2013, 22:15

... element As with class, the ID is specified in the XUL with an attribute (e.g., ) and in the CSS with the pound sign preceding the ID itself In this example, the menu with an ... example, all menus with a XUL baseline class have no borders and a nine-point font size Note that you can use the class without the preceding XUL element to skin all XUL elements with a given class ... attribute selector allows you to style XUL elements with particular attributes or with attributes of a particular value In Example 4-2, all elements with a disabled attribute set to true will have...

Ngày tải lên: 28/10/2013, 15:15

... 4.2.2.7 Element relation selectors Contextual subgroups elements appearing within other elements, such as italicized text within a element or a in HTML can be grouped in CSS, but this ... menuitem has a border only when it appears within the toolbar whose class is given as "primary." In the parent-child example, all menu items in a menu with the id "file" are made bold Using +, ... expensive with each new level, and that the descendent operation is particularly processor-intensive 4.2.2.8 The !important keyword As you might imagine, when you have a technology with such...

Ngày tải lên: 28/10/2013, 15:15

... select the item, it appears momentarily with a dark gray background and white lettering, like reverse video The Quit menu item, unlike others, appears with a black background Note that it also ... preinstalled with the browser The Classic skin is modeled after earlier versions of the Mozilla UI and of the Netscape 4.x Communicator product It has the familiar light grey box look, with the larger, ... smoother overall look, with rounded edges on many of the widgets, subtle color differentiations, gradients, and 3D icons However, both skins sit on top of the same XUL With one notable exception...

Ngày tải lên: 07/11/2013, 09:15

... for these bindings is located in the content subdirectories with the binding XML files In this way, they "stay with" the widget and not with the selected skin You can easily extend or overwrite ... file loaded in Mozilla with no skin information The second is the same XUL file with the global skin loading instruction at the top The third is a screenshot of that XUL file with an instruction ... widgets is defined Even if you create a skin that looks completely different than the skins installed with Mozilla, you should import the global skin to avoid having to recreate so much of the basic...

Ngày tải lên: 07/11/2013, 09:15

... 4.5.1 Binding New Widgets to the Interface Using XBL A description of skins wouldn't be complete without a mention of binding widgets by using XBL, a very powerful feature of CSS in Mozilla The ... define new XUL content, new JavaScript, and new XPConnected interfaces CSS glues the XUL together with the XBL In the first part of the snippet in Example 4-13, for example, the CSS rule binds the ... sometimes they are installed in the user profile and sometimes you create them yourself they come with example rules that are commented out However, you can uncomment them and add your own rules...

Ngày tải lên: 07/11/2013, 09:15

... brief , text , line , or html These produce an error message with no trace, a multiline error with trace information, a single-line error with tab-separated fields (suitable for writing to a log), ... first component in the stack If this method is called with an integer argument, then that number is used as an index number into the stack Just as with Perl arrays, negative integers start at the ... this value is Buffer-Related Methods The following methods all deal with Mason's buffer objects A typical request starts off with a single base buffer For each component that is called in the...

Ngày tải lên: 14/12/2013, 12:15

... attribute with undef as its value and an attribute that is not found To make that distinction, use the attr() method and wrap it in an eval {} block, or use this method in conjunction with the ... '$undefined' => { default => ' undef' } } Note the difference between an argument with no default value and an argument with a default value of undef Also, as you can see, the default value for each ... name, separated by a c olon (:) As with dir_path(), the path returned here is a URL-style path and uses the forward slash (/) as its separator • subcomps With no arguments, returns a hash reference...

Ngày tải lên: 14/12/2013, 12:15

... b1_2out(OUT1, OUT2, IN); // gate instantiation without instance name not (OUT1, IN); // legal gate instantiation 11 Primitive gates Bufif/notif Gates with an additional control signal on buf and ... - Like schematics, but using text: netlist - Boring when write, and hard to decode - Essential without integrated design tools Structural model  Structural Models are built from gate primitives, ... or1(OUT, IN1, IN2); nand na1_3inp(OUT, IN1, IN2, IN3); nor nor1(OUT, IN1, IN2); // gate instantiation without instance name xor x1(OUT, IN1, IN2); and (OUT, IN1, IN2); // legal gate instantiation xnor...

Ngày tải lên: 07/03/2014, 14:20

... width with varying amplitude Flattop - sample and hold, like natural but with single amplitude value The process is referred to as pulse amplitude modulation PAM and the outcome is a signal with ... uneven gaps between frames Transmission of bits is fixed with equal gaps Digital Multiplexing  Time Division Multiplexing 2Mbit/s PCM Frame  Digital Hierarchy  Line Termination Codecs Multiplexer ... we send the analog signal, we need a channel with a minimum bandwidth of kHz If we digitize the signal and send bits per sample, we need a channel with a minimum bandwidth of × kHz = 32 kHz 4.26...

Ngày tải lên: 10/03/2014, 18:20

... Digital Electronics   Digital system { 0, } { 0, } {True, False} Digital Circuits (or Digital Logic Circuits) Dr Le Dung - School of Electronics and Telecommunications Page What is the Digital ... Page What is the Digital Electronics Digital Techniques (ADC, Digital Information Processing, DAC) Digital Electronics (Digital Logic Circuits) 0 Dr Le Dung - School of Electronics and Telecommunications ... Digital Electronics   Analog signal and Analog system Analog  Continuous Dr Le Dung - School of Electronics and Telecommunications Page What is the Digital Electronics   Information Digitalization...

Ngày tải lên: 28/03/2014, 00:39

... Part I: Digital Principles - Contents Chapter : Binary system and Binary Codes Chapter : Boolean Algebra Chapter : Logic Gates and Digital Integrated Circuits Dr Le Dung - School of Electronics ... Dung - School of Electronics and Telecommunications Page 1.1 Binary System  Number System + An ordered set of symbols + A number = Positional Notation + Polynomial Notation (with r- radix and ... ? Dr Le Dung - School of Electronics and Telecommunications Page 10 8/13/13 1.1 Binary System  Base Conversions   Convert to base 10  use the polynomial notation with radix and weighted positions...

Ngày tải lên: 28/03/2014, 00:39

... School of Electronics and Telecommunications Page 33 3.3 DIGITAL INTEGRATED CITCUITS  Digital IC notation Dr Le Dung - School of Electronics and Telecommunications Page 34 17 9/9/13 3.3 DIGITAL ... GATES  Digital circuits work with and and use “switches” Ref.: http://www.wordbench.com/video/ucan.html How to make an electronic “switch” in digital circuit ? Dr Le Dung - School of Electronics ... Conversion 3.3 Digital Integrated Circuits + Integrated Circuit (IC) and Scale of Integration + Digital IC Families (TTL, CMOS) + Specifications of Digital IC Dr Le Dung - School of Electronics...

Ngày tải lên: 28/03/2014, 00:40

... 4-1 DIGITAL- TO -DIGITAL CONVERSION In this section, we see how we can represent digital data by using digital signals The conversion involves three techniques: ... consecutive zeros with 000V or B00V depending on the number of nonzero pulses after the last substitution 4.40 4-2 ANALOG-TO -DIGITAL CONVERSION We have seen in Chapter that a digital signal is ... encoding 4.35 Figure 4.18 AMI used with scrambling 4.36 Figure 4.19 Two cases of B8ZS scrambling technique 4.37 Note B8ZS substitutes eight consecutive zeros with 000VB0VB 4.38 Figure 4.20 Different...

Ngày tải lên: 29/03/2014, 11:20

... workings of the system The stop points could be optimized with back-testing software, but as a general rule, with S&P futures at or above 1000 and with $VIX in the low-tomid-20’s, I use a stop of 5.00 ... run of trades by CHOOSING A SYSTEM 125 your system? If so, you must either trade with more capital or find a system with a smaller drawdown While we are on the subject, let us discuss drawdown because ... points to be computed with the S&P 500 futures prices Those entry rules are well-defined However, there must be well-defined exit rules as well You must use stops that are in line with the volatility...

Ngày tải lên: 03/07/2014, 19:20

... Figure 4-2 U.S DOLLAR INDEX WITH ITS 10-DAY SIMPLE MOVING AVERAGE Market made a top here Price crosses moving average Chart of daily prices of the U.S Dollar Index with its 10-day simple moving ... number of permutations and combinations of what can be done with moving averages is staggering Figure 4-3 shows the U.S Dollar Index with its 5-day and 10-day simple moving averages superimposed ... instead of being plotted in alignment with the price of Day t, might be shifted forward (to the right) so it is plotted on the price chart to correspond with Day t+2 (the day after tomorrow)...

Ngày tải lên: 04/07/2014, 13:20