Bạn có thể nghĩ rằng một tỷ lệ lấy mẫu của 11,025 kHz là đủ để ghi một cây đàn piano bởi vì tần số cao nhất của một chiếc piano là 4186 Hz. Tuy nhiên, 4186 Hz cơ bản cao nhất của một chiếc piano. Cắt tất cả các sóng sin trên Hz giảm âm bội có thể được sao chép và sẽ không chính xác nắm bắt | This document is created with the unregistered version of CHM2PDF Pilot like the output from that antique piece of hardware known as a typewriter. Times New Roman is a clone of the TimSimpoOPDFMergeanC 5plit Unregisterecịyềrsiorỳ http Consideredto be highly readable. Arial is a clone of Helvetica a sans serif font. The Symbol font contains a collection of handy symbols. Attributes or Styles You ll notice in the list of TrueType fonts shown above that bold and italic styles of Courier Times New Roman and Arial seem to be separate fonts with their own typeface names. This naming is very much in accordance with traditional typography. However computer users have come to think of bold and italic as particular attributes that are applied to existing fonts. Windows itself took the attribute approach early on when defining how the raster fonts were named enumerated and selected. With TrueType fonts however more traditional naming is preferred. This conflict is not quite ever resolved in Windows. In short as you ll see you can select fonts by either naming them fully or by specifying attributes. The process of font enumeration in which an application requests a list of fonts from the system is as you might expect complicated somewhat by this dual approach. The Point Size In traditional typography you specify a font by its typeface name and its size. The type size is expressed in units called points. A point is very close to 1 72 inch so close in fact that in computer typography it is often defined as exactly 1 72 inch. The text of this book is printed in 10-point type. The point size is usually described as the height of the characters from the top of the ascenders without diacritics to the bottom of the descenders encompassing for example the full height of the letters bq. That s a convenient way to think of the type size but it s usually not metrically accurate. The point size of a font is actually a typographical design concept rather than a metrical
