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- W2990809376 abstract "Most modern digital speech codecs are proprietary and do not give insights into their implementations. “Codec 2” is an open-source codec and opens up the possibility of application-tailored adaptations. In this publication a new 450 bit/ $s$ mode is introduced. It includes a pseudo-wideband mode that can be optionally enabled at the receiver without resulting in a higher bit rate. By sorting the codebook vectors a bit error rate of 10−1 is still intelligible. An encoded audio transmission was tested with two low-power Sub-GHz transceivers in the 70 cm amateur radio band achieving a sensitivity of -130 dBm. For proofing the concept, a field test was conducted and compared to a propagation simulation." @default.
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- W2990809376 date "2019-10-01" @default.
- W2990809376 modified "2023-10-01" @default.
- W2990809376 title "An Open-Source Speech Codec at 450 bit/s with Pseudo-Wideband Mode" @default.
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- W2990809376 doi "https://doi.org/10.23919/eumc.2019.8910691" @default.
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