It will be a software emulated ev1527 or a Princeton Technology chip; viewing the waveform will tell you which one. Usually available between a receiver chip and decoder IC on the receiver pcb. Reminds me of my decoding sessions as a young teen, using a receiver (from a junked car alarm), tape recorder, and data slicer into an 8 bit home computer. Really bodgy, but it worked. For ASK now, I'd simply interface a bare receiver to the input of a sound card and record the result in Audacity for analysis. I'd be using a bare 433MHz transmitter module connected to an arduino to generate the signal rather than the sledgehammer esp and cc1101 combination. Soundcard is fine on the demodulated signal from a receiver for these things as the data rate is so low.