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Content Source B of the same test sequence set (since they all used the same source sequence), or they can be compared to other sets that have been generated using the same source sequence at another bit rate. If objective measurements vary greatly from one bit rate to another in portions of the output sequences, then you can examine them more extensively using subjective techniques. Content Source A Audio- Video Encoder A Expected Results: Audio Quality Improves With Increasing Bit Rate The full-reference test and measurement process for evaluating codec technologies is very similar to the one for choosing a bit rate, except that you change the codec engine for each test instead of the bit rate (Figure 3). After evaluating the first codec (A), simply insert a second codec (B) into the test workflow and start again. From there PEAQ measurements can be made to identify trends in the average sequence scores as a result of the different codecs. By using full-reference testing and the PEAQ audio quality scoring model, content originators can get a clear idea of how close a processed audio signal is to the original, and how it is affected by changes in different delivery variables. The results of these tests help them to ensure a highly accurate measurement of quality for audio delivery. PEAQ Audio- 4K Video Decoder A Decoder A Full Reference Test Set Type B Type A Increasing Mean Quality Rating Bit Rate Figure 3: Codec Technology Selection