Bit depth describes the range of amplitude values taken from the sample. Low quality sound files have a bit depth of 8 bits. CD-quality music requires at least 16 bits. The trade-off is that the greater the bit depth, the larger the sound file. So there is a balance between sampling rate, sampling depth, sound quality and file size. Humans can locate the source of analogue sounds; we hear in ____. To replicate this effect digitally, we need to measure sound from several sources. The signal from each source is a ____. When you want to play the audio file, the samples are sent to the sound card. It converts them into an ____ signal. That signal vibrates the diaphragm in the ____, producing sound. You may need to calculate two pieces of information in your exam. These are the ‘bit rate’ and the ‘file size’ of the digitised sound. The bit rate is the amount of information required to describe one ____ of sound. Audio files often include extra information about how the sound was captured. This ____ includes the sample rate, the bit rate, the length and the ____.

Sound Part 2

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