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AMR-NB, or Adaptive Multi-Rate Narrowband, is a standardized audio codec designed for compressing voice audio in mobile telecommunications. It was developed by the 3rd Generation Partnership Project (3GPP) and is widely used in mobile devices for voice calls and multimedia messaging. The format allows for efficient encoding of narrowband audio signals, which is essential in environments with limited bandwidth.
The codec operates at bit rates ranging from 4.75 kbps to 12.2 kbps, adjusting dynamically based on the network conditions to ensure optimal audio quality. This adaptability makes AMR-NB particularly effective in cellular networks, where bandwidth can fluctuate significantly. The format supports a range of features such as error resilience, which enhances the clarity of speech even in poor transmission conditions.
AMR-NB is not only used in voice calls but has also found applications in voice recording and digital assistants. Its efficiency and sound quality have led to its adoption in various mobile applications and services. Additionally, the format is integral to the GSM (Global System for Mobile Communications) standard, making it a key component of mobile communication worldwide.
Despite the emergence of newer codecs, AMR-NB remains relevant due to its widespread compatibility and established presence in legacy systems. The format is often encountered in mobile audio files, ringtones, and other voice-related applications. As a result, many devices and applications are equipped to handle AMR-NB files, ensuring that users can access and utilize this format seamlessly.