Abstract
A 16 kbit/s speech codec is described which was developed by British Telecom Research Laboratories and selected as the UK candidate to the GSM Pan-European study on digital cellular land mobile radio. The hardware described and test results presented correspond to the equipment tested in the European contest at Turin, Italy. The codec, whilst giving good speech quality, also offers several important features including low delay, low computational complexity and a good tolerance to transmission errors. The codec employs an 8-band subband coding algorithm incorporating backward-adaptive quantisation and backward-adaptive prediction. The hardware implementation described uses a pair of digital signal processing devices, thereby giving a very compact realisation. The results of both subjective and objective tests are also presented.
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