1.2 - text, sound, and images 📃 Flashcards
to learn how to interpret character tables and understand how devices store file data
what does the sixth bit in an ASCII byte determine?
if a character’s lowercase or uppercase
how many bits can there be in standard and extended ASCII?
7 (standard), 8 (extended)
what makes Unicode better than ASCII?
it unambiguously encodes characters in 16- and 32-bit binary and can also cover all writing systems and languages
how can an ADC convert analog sound waves into digital data?
by estimating their amplitudes at a certain sampling rate
how can higher sampling rates be beneficial?
the resulting audio file’s got a wider dynamic range, higher sound quality, and less distortion
what problems can occur with increasing sampling rates?
the resulting audio file’s larger in size and can thus result in slower data transmission rates and higher processing power requirements
what determines a picture’s color depth?
the number of bits per pixel (eg. 8-bit -> 256 possible colors for each pixel)
what determines image resolution?
the number of pixels the image’s got in total (eg. 4K image resolution = 2160 horizontal pixels)
