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Воскресенье, 14 июня 2015 г. DTMF Generators HT9200 and DTMF Decoder MT8870HT9170 Control STM32F407. DTMF GeneratorsTransmitter built on IC HT9200AHT9200B Holtek. For example, below picture DTMF signal 697 Hz 1209 Hz, it is code digit 1. And now look at the frequency domain FFT. Here is the standard connection scheme IC HT9200A 8pin package and HT9200B 14pin package Holtek. Here is the code table for this table, you can learn what you need to send a code to get the desired DTMF signal. For ; Val!CONTENT
This web page ir-automatics.blogspot.com states the following, "Воскресенье, 14 июня 2015 г." We saw that the webpage said " DTMF Generators HT9200 and DTMF Decoder MT8870HT9170 Control STM32F407." It also said " DTMF GeneratorsTransmitter built on IC HT9200AHT9200B Holtek. For example, below picture DTMF signal 697 Hz 1209 Hz, it is code digit 1. And now look at the frequency domain FFT. Here is the standard connection scheme IC HT9200A 8pin package and HT9200B 14pin package Holtek. Here is the code table for this table, you can learn what you need to send a code to get the desired DTMF signal."