5.5 Receiver Output Buffer

26.4483GPPCodec for Enhanced Voice Services (EVS)Jitter Buffer ManagementRelease 17TS

Figure 7: Receiver Output Buffer

A FIFO queue for PCM data called the Receiver Output Buffer is present in the EVS JBM solution. Since the Time Scale Modification module does not generate speech frames of length 20 ms if signal-based adaptation has occurred, this buffer ensures that the Acoustic Frontend is provided with PCM data with a fixed size of 20 ms. As outlined in Figure 7, the Receiver Output Buffer uses a ringbuffer data structure where the variable sized output of the Time Scale Modification module is enqueued and a 20ms buffer is dequeued for the Acoustic Frontend.

A FIFO queue for PCM data called the Receiver Output Buffer is present in the EVS JBM solution. As outlined in Figure 7 it provides PCM data with a fixed size of 20 ms for the Acoustic Frontend, although the Time Scale Modification module does not generate speech frames of length 20 ms if signal-based adaptation has occurred. The Receiver Output Buffer uses a ringbuffer data structure where the variable sized output of the Time Scale Modification module is enqueued and a 20 ms buffer is dequeued for the Acoustic Frontend.