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Subjective Evaluation of MPEG Layer II with Spectral Band Replication

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Spectral Band Replication (SBR) was developed as a means of enhancing the coding of audio signals. It has been recently proposed to use SBR, integrated within the MPEG Layer II codec, as a possible extension to the EUREKA 147 DAB standard. The goal is to provide an equivalent level of subjective quality at a reduced bitrate. In the present study, formal subjective tests were conducted to evaluate the performance of Layer II+ SBR at typical DAB bitrates. The tests included Layer II+ SBR codecs operating at 128 and 160 kbps, as well as a standard Layer II codec at 128, 160, and 192 kbps. The subjective tests were conducted using the ITU-R BS. 1534 (MUSHRA) methodology.

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