The use of ultrasound is interesting! The first step (identifying speech) is called subvocalization recognition, and early research (Chuck Jorgensen, et. al (20

The use of ultrasound is interesting! The first step (identifying speech) is called subvocalization recognition, and early research (Chuck Jorgensen, et. al (2023) from NASA) use EMG[1]. [1]: https://scispace.com/pdf/sub-auditory-speech-recognition-based-on-emg-signals-5fgcay74g5.pdf https://scispace.com/pdf/sub-auditory-speech-recognition-bas...