The aim of this book is to teach the basic principles of Digital Signal Processing (DSP) and to
introduce it from a practical point of view using the bare minimum of mathematics. Only the
basic level of discrete-time systems theory is given sufficient to implement DSP applications
in real time. The practical implementations are described in real time using the highly popular
ESP32 DevKitC microcontroller development board. With the low cost and extremely popular ESP32
microcontroller you should be able to design elementary DSP projects with sampling frequencies
within the audio range. All programming is done using the popular Arduino IDE in conjunction
with the C language compiler. After laying a solid foundation of DSP theory and pertinent
discussions on the main DSP software tools on the market the book presents the following
audio-based sound and DSP projects: Using an I²S-based digital microphone to capture audio
sound Using an I²S-based class-D audio amplifier and speaker Playing MP3 music stored on an SD
card through an I²S-based amplifier and speaker Playing MP3 music files stored in ESP32 flash
memory through an I²S-based amplifier and speaker Mono and stereo Internet radio with I²S-based
amplifiers and speakers Text-to-speech output with an I²S-based amplifier and speaker Using the
volume control in I²S-based amplifier and speaker systems A speaking event counter with an
I²S-based amplifier and speaker An adjustable sinewave generator with I²S-based amplifier and
speaker Using the Pmod I²S2 24-bit fast ADC DAC module Digital low-pass and band-pass real-time
FIR filter design with external and internal A D and D A conversion Digital low-pass and
band-pass real-time IIR filter design with external and internal A D and D A conversion Fast
Fourier Transforms (FFT)
