TTS digital board for phone number tones detection
1990-1991 (9 months being student), customer: Zhitomir Trunk Telephone Station, outsourcing, 1 developer
result: 1 sample was implemented and tested, they had started serial manufacturing
OS/Hardware: DOS/designed MC board; languages: Assembler i8051; tools: i8051 cross assembler
This board (for Computer controlled TTS) substitutes analog one. It detects tones of coded phone number that is passed between TTS of cities.
Prior to digital board TTS had larger percentage of errors while number detection.
Board includes i8031 MC (i51 w/o internal ROM), RAM/ROM, phone line interface with analog filter of input signal, TTS rack interface (6 logical outputs for each tone in code) and switching power unit (TTS 24V to board’s power).
Microcontrollers, Phone/Sound, Power Units, Signal Processing