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Bell 202 modem - WikiMili, The Best Wikipedia Reader
https://wikimili.com/en/Bell_202_modem#:~:text=From%20Wikipedia%2C%20The%20Free%20Encyclopedia%20The%20Bell%20202,transmission%20only%20in%20one%20direction%20at%20a%20time%29.
Lab5_Part_2-Audio_Frequency_Shift_Keying(AFSK)
https://inst.eecs.berkeley.edu/~ee123/sp17/lab/lab5/Lab5_Part_2-Audio_Frequency_Shift_Keying(AFSK).html
AFSK1200, or Bell 202 modem¶ AFSK1200 encodes digital binary data at a data-rate of 1200b/s. It uses the frequencies 1200Hz and 2200Hz ( center frequency of $1700$Hz $\pm 500$ Hz) to encode the '0's and '1's (also known as space and mark) bits.
Lab6 Part A- Audio Frequency Shift Keying (AFSK)
https://inst.eecs.berkeley.edu/~ee123/sp15/lab/lab6/Lab6-Part-A-Audio-Frequency-Shift-Keying.html
AFSK1200, or Bell 202 modem¶ AFSK1200 encodes digital binary data at a data-rate of 1200b/s. It uses the frequencies 1200Hz and 2200Hz ( center frequency of $1700$Hz $\pm 500$ Hz) to encode the '0's and '1's (also known as space and mark) bits.
Bell 202 modem - Semantic Scholar
https://www.semanticscholar.org/topic/Bell-202-modem/2208274
It specifies audio frequency-shift keying (AFSK) to encode and transfer data at a rate of 1200 bits per second, half-duplex (i.e. transmission only in one direction at a time). These signalling protocols, also used in third-party modems, are referred to generically as Bell 202 modulation, and any device employing it as Bell-202-compatible.
Bell 202 modem - WikiMili, The Best Wikipedia Reader
https://wikimili.com/en/Bell_202_modem
The Bell 202 modem was an early (1976) modem standard developed by the Bell System. It specifies audio frequency-shift keying (AFSK) to encode and transfer data at a rate of 1200 bits per second, half-duplex (i.e. transmission only in one direction at a time). These signalling protocols, also used in third-party modems, are referred to generically as Bell 202 …
Audio frequency shift keying - zxc.wiki
https://de.zxc.wiki/wiki/Audio_Frequency_Shift_Keying
Bell 202 With the widely used 1200 baud AFSK , for example, the two tone frequencies 1200 and 2200 Hz are keyed. The difference between these two sound frequencies (in this case 1000 Hz) is called the shift . These frequencies come from AT&T "Bell 202" modem that was connected directly to an FM radio. Advantages and disadvantages
afsk - PyPI
https://pypi.org/project/afsk/
Bell 202 Audio Frequency Shift Keying encoder and APRS packet audio tools. Navigation. Project description Release history Download files Project links. Homepage Statistics. GitHub statistics: Stars: Forks: Open issues/PRs: View statistics for this project via Libraries ...
Correct my (mis)understanding of Bell 202 signalling | All ...
https://forum.allaboutcircuits.com/threads/correct-my-mis-understanding-of-bell-202-signalling.163348/
A Bell 202 modem sends audio signals to represent digital data. This signalling method can be called AFSK (audio frequency shift keying.) Binary ones (marks) are represented by 1200Hz (+/- 10Hz) audio. Binary zeroes (spaces) are represented by 2200Hz (+/- 10Hz) audio.
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