Download 15.Consumer Electronics by John G. Webster (Editor) PDF

By John G. Webster (Editor)

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It was at this stage that the International Telephone and Telegraph Consultative Committee (CCITT) began work on producing standards for facsimile terminals. In 1993 a reorganization in the International Telecommunications Union (ITU) resulted in the CCITT being renamed the International Telecommunications Union–Telecommunications Standardization Sector (ITU-T). For simplicity, ITU-T will be used hereafter. 2 (2). These terminals transmit an A4 page in 6 min using frequency modulation with a ‘‘white’’ signal corresponding to 1300 Hz and a ‘‘black’’ signal corresponding to 2100 Hz.

These terminals transmitted an A4 page in 3 minutes using amplitude modulation/vestigial sideband modula- Scanner Coder 245 tion system with a carrier frequency of 2100 Hz. The ‘‘white’’ signal corresponded to the maximum carrier level and the ‘‘black’’ signal to the minimum carrier level (at least 26 dB below ‘‘white’’) or no carrier. The reduction in transmission time was achieved by increasing the scanning line frequency to 360 lines per minute. Exact details of the other parameters can be found in Ref.

To be able to represent very large numbers with a fixed number of bits, and also to optimize arithmetic operations for the design of the calculator, floating-point numbers are used in calculators and computers. Figure 7. A dialog box on a graphing calculator is used to specify the plot scale. 574 ELECTRONIC CALCULATORS Floating-Point Numbers Floating-point numbers are numbers in which the location of the decimal point may move so that only a limited number of digits are required to represent large or small numbers.

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