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With the current focus on high-speed packet data transmission, it is easy to forget that the primary purpose of GSM digital telecommunication systems was speech transmission. The general perception is that the complexity of the overall system is associated with the management of the transmission link. However, there is a great deal of complexity in the compression and decompression of the audio captured by the microphone. Speech must be captured at a high enough sample rate and resolution to allow clear reproduction of the original sound and compressed in such a way as to maintain the fidelity of the audio over a limited bit rate, error-prone wireless transmission channel.
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