At present, voice encryption technology is mainly divided into analog voice encryption and digital voice encryption in two ways. Analog voice encryption is also called analogue scrambling, which turn the intelligible signal into unintelligible by destructing the original feature of speech through the voice signal frequency domain scrambling, time domain scrambling or a mixture [...]
Mobile communication: The GSM vocoder is RPE-LTP (coding rate for the full rate FR is 13Kb/s, half rate HR is 5.6Kb/s, enhanced full rate EFR is 12.2Kb/s) The WCDMA vocoder is AMR (coding rate is 12.2Kb/s) The VOLTE vocoder is AMR-WB (coding rate is 23.85Kb/s) The Telecommunication CDMA and CDMA2000 vocoders are EVRC (3 [...]
What is the relationship between the vocoder rate of the RLSpeak™ solution and voice communication line?
No direct. For example, a low rate vocoder “codec2” was applied to the RLSpeakTM solution, which coding rates are 700b/s, 1300b/s and 2400b/s. The coding rate here is refer to the rate of coding and compressing the PCM data stream generated after the analog voice input and converted by A/D codec. The vocoder rate [...]
The time of encrypted call chain building is related to the amount of data that is required to transmit for the key exchange in the selected key agreement protocol. The larger the amount of data to be transmitted, the longer the chain building time needed.
Surely not. RLSpeakTM technology uses an end-to-end key negotiation mechanism. Eavesdroppers use RLSpeakTM products can demodulate the encrypted data, but cannot decrypt it and get plain speech due to couldn’t get the session key.