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2. Retrieval-based Voice Conversion - Wikipedia

   en.wikipedia.org/wiki/Retrieval-Based_Voice...

   Retrieval-based Voice Conversion (RVC) is an open source voice conversion AI algorithm that enables realistic speech-to-speech transformations, accurately preserving the intonation and audio characteristics of the original speaker.

3. Voice changer - Wikipedia

   en.wikipedia.org/wiki/Voice_changer

   The term voice changer (also known as voice enhancer) refers to a device which can change the tone or pitch of or add distortion to the user's voice, or a combination and vary greatly in price and sophistication. A kazoo or a didgeridoo can be used as a makeshift voice changer, though it can be difficult to understand what the person is trying ...

4. Robotic voice effects - Wikipedia

   en.wikipedia.org/wiki/Robotic_voice_effects

   Ring modulator Although ring modulation usually does not work well with melodic sounds, it can be used to make speech sound robotic. As an example, it has been used to robotify the voices of the Daleks in Dr Who. Speech synthesis Robotic voices in music may also be produced by speech synthesis. This does not usually create a "singing" effect ...

5. Vocoder - Wikipedia

   en.wikipedia.org/wiki/Vocoder

   The development of a vocoder was started in 1928 by Bell Labs engineer Homer Dudley, [5] who was granted patents for it on March 21, 1939, [6] and Nov 16, 1937. [7]To demonstrate the speech synthesis ability of its decoder section, the voder (voice operating demonstrator) [8] was introduced to the public at the AT&T building at the 1939–1940 New York World's Fair. [9]

6. Continuously variable slope delta modulation - Wikipedia

   en.wikipedia.org/wiki/Continuously_variable...

   Continuously variable slope delta modulation (CVSD or CVSDM) is a voice coding method. It is a delta modulation with variable step size (i.e., special case of adaptive delta modulation), first proposed by Greefkes and Riemens in 1970. CVSD encodes at 1 bit per sample, so that audio sampled at 16 kHz is encoded at 16 kbit/s.

7. M17 (amateur radio) - Wikipedia

   en.wikipedia.org/wiki/M17_(amateur_radio)

   M17 uses Codec 2, a low bitrate voice codec developed by David Rowe VK5DGR et al. Codec 2 was designed to be used for amateur radio and other high compression voice applications. It is based on linear predictive coding with mixed-harmonic sinusoidal excitation.