# Digital Video Encoder for Video CD

Jun 28th, 2015
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The SPCA717A is designed specifically for VideoCD, video games and other digital video systems, which require the conversion of digital YCrCb (MPEG) data to analog NTSC/PAL video. The device supports a glue-less interface to most popular MPEG decoders. The SPCA717A supports worldwide video standards, including NTSC (N America, Japan) PAL-B, D, G, H, I (Europe, Asia), PAL-M (Brazil), PAL-N (Uruguay, Paraguay), and PAL-Nc (Argentina). Furthermore,

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133Chapter 7CONGRUENCE OF TRIANGLESCongruence ofTrianglesdehsTilRbEuCpeN erbott7.1 INTRODUCTIONYou are now ready to learn a very important geometrical idea, Congruence. In particular,you will study a lot about congruence of triangles.To understand what congruence is, we turn to some activities.DO THISTake two stamps (Fig 7.1) of same denomination. Place one stamp overthe other. What do you observe?Fig 7.1One stamp covers the other completely and exactly. This means that the two stamps areof the same shape and same size. Such objects are said to be congruent. The two stampsused by you are congruent to one another. Congruent objects are exact copies of oneanother.Can you, now, say if the following objects are congruent or not?1. Shaving blades of the same company [Fig 7.2 (i)].2. Sheets of the same letter-pad [Fig 7.2 (ii)]. 3. Biscuits in the same packet [Fig 7.2 (iii)].4. Toys made of the same mould. [Fig 7.2(iv)]on(i)(ii)Fig 7.2(iii)(iv)134MATHEMATICSThe relation of two objects being congruent is called congruence. For the present,we will deal with plane figures only, although congruence is a general idea applicable tothree-dimensional shapes also. We will try to learn a precise meaning of the congruenceof plane figures already known.7.2 CONGRUENCEOFPLANE FIGURESLook at the two figures given here (Fig 7.3). Are they congruent?dehsTilRbEuCpeN erbott(i)(ii)Fig 7.3

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