Sound And Graphics Flashcards
How is sound sampled and stored?
Sound is an analogue signal, as sound is sent to the computer as an analogue signal it then has to be converted into a digital signal to then be processed.
Sound signals are processed using a method called sampling. This is where hardware, such as a microphone, measures the level of sound many times per second and records this as binary digits.
How does sampling work?
The number of times that the sound level is sampled per second is called the sampling frequency. The higher the sampling frequency, the better the quality of the sound recorded. A typical sampling frequency is 44,000 times per second, also
known as 44 kHz. This is the sampling frequency used on most
audio CDs.
How is an image represented by pixels in a digital format?
Images on a computer system are made up of thousands of small coloured dots, known as pixels (short for picture elements). Bitmap images are stored as an array of pixels. A black and white bitmap image will store a 1 for a black pixel and 0 for a white pixel.
