Amr wb nb意思
"AMR WB NB" is a term used in the context of speech and audio coding, particularly in the field of telecommunications and multimedia. It stands for "Adaptive Multi-Rate Wideband (AMR-WB) Narrowband (NB)".
Here's a breakdown of the components:
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AMR (Adaptive Multi-Rate): This is a family of audio codecs developed by 3GPP for use in mobile networks. AMR is known for its ability to adapt the bitrate according to the network conditions and the quality of the audio signal.
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WB (Wideband): This refers to the frequency range of the audio signal. Wideband codecs encode audio at frequencies up to approximately 7 kHz, which provides better sound quality compared to narrowband codecs.
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NB (Narrowband): This term is a bit confusing in this context, as it seems to contradict the "WB" part. However, in the context of AMR, "NB" could refer to the use of narrowband channels for transmission, which is a common practice in mobile networks. It's possible that "AMR WB NB" is used to indicate that a wideband codec is being used over a narrowband channel, which might require some form of signal processing or adaptation to ensure optimal transmission and reception.
It's important to note that the meaning of "AMR WB NB" could vary depending on the specific context in which it is used. In some cases, it might refer to a specific configuration or mode of operation for a speech codec, rather than a standard or widely recognized term.