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  2. Signal (software) - Wikipedia

    en.wikipedia.org/wiki/Signal_(software)

    Signal is the successor of the RedPhone encrypted voice calling app and the TextSecure encrypted texting program. The beta versions of RedPhone and TextSecure were first launched in May 2010 by Whisper Systems , [ 54 ] a startup company co-founded by security researcher Moxie Marlinspike and roboticist Stuart Anderson.

  3. Vocoder - Wikipedia

    en.wikipedia.org/wiki/Vocoder

    A vocoder (/ ˈ v oʊ k oʊ d ər /, a portmanteau of voice and encoder) is a category of speech coding that analyzes and synthesizes the human voice signal for audio data compression, multiplexing, voice encryption or voice transformation. The vocoder was invented in 1938 by Homer Dudley at Bell Labs as a means of synthesizing human speech. [1]

  4. Signal Protocol - Wikipedia

    en.wikipedia.org/wiki/Signal_Protocol

    The Signal Protocol (formerly known as the TextSecure Protocol) is a non-federated cryptographic protocol that provides end-to-end encryption for voice and instant messaging conversations. [2] The protocol was developed by Open Whisper Systems in 2013 [ 2 ] and was introduced in the open-source TextSecure app, which later became Signal .

  5. Signal downloads skyrocketed 4,200% after WhatsApp ... - AOL

    www.aol.com/news/signals-downloads-skyrocketed...

    Signal topped Apple and Google's app stores and saw 7.5 million downloads in the five days following WhatsApp's announcement about data-sharing.

  6. Comparison of cross-platform instant messaging clients

    en.wikipedia.org/wiki/Comparison_of_cross...

    For some features: secret chats, [116] voice and video calls, [117] and voice chats in groups [117] No No No Tencent QQ: No [118] [119] No No No No Threema: No A valid phone number or email address is not required for registration & login. However, the mobile app serves as the primary device, due to the end-to-end encryption architecture. [120 ...

  7. Comparison of free software for audio - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_free...

    a plugin architecture for digital signal processing: LGPL-2.1-or-later: Open Sound System: Yes Yes a sound card management and driver system for Unix operating systems: BSD-2-Clause CDDL-1.0 GPL-2.0-only Proprietary (formerly) PipeWire: Wim Taymans Yes Yes (FreeBSD) a media daemon, unifying JACK Audio Connection Kit, PulseAudio, and GStreamer ...

  8. Select and enable a New Mail notification in AOL Mail

    help.aol.com/articles/select-and-enable-a-new...

    AOL Mail lets you customize the notification sound you'll get when you receive a new email message. Choose to have a generic sound notification or play the iconic "You've Got Mail" alert with the original voice or your favorite celebrity's voice. Enable a new mail notification sound

  9. Single-sideband modulation - Wikipedia

    en.wikipedia.org/wiki/Single-sideband_modulation

    If the BFO frequency is off, the output signal will be frequency-shifted (up or down), making speech sound strange and "Donald Duck"-like, or unintelligible. For audio communications, there is a common agreement about the BFO oscillator shift of 1.7 kHz. A voice signal is sensitive to about 50 Hz shift, with up to 100 Hz still bearable.

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