Easy and Affordable Digital Signal Processing 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)

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The Elektor Audio DSP FX Processor combines an ESP32 microcontroller and an ADAU1701 Audio DSP from Analog Devices. Besides a user-programmable DSP core, the ADAU1701 has high-quality analog-to-digital and digital-to-analog converters built-in and features an I²S port. This makes it suitable as a high-quality audio interface for the ESP32. Programs for the ESP32 can be created with Arduino, Platform IO, CMake or by using the Espressif IDF in another way. Programs for the ADAU7101 audio DSPs are created with the free visual programming tool SigmaStudio by dragging and dropping pre-defined algorithm blocks on a canvas. Applications Bluetooth/Wi-Fi audio sink (e.g. loudspeaker) & source Guitar effect pedal (stomp box) Music synthesizer Sound/function generator Programmable cross-over filter for loudspeakers Advanced audio effects processor (reverb, chorus, pitch shifting, etc.) Internet-connected audio device DSP experimentation platform Wireless MIDI MIDI to CV converter and many more... Specifications ADAU1701 28-/56-bit, 50-MIPS digital audio processor supporting sampling rates of up to 192 kHz ESP32 32-bit dual-core microcontroller with Wi-Fi 802.11b/g/n and Bluetooth 4.2 BR/EDR and BLE 2x 24-bit audio inputs (2 V RMS, 20 kΩ) 4x 24-bit audio outputs (0.9 V RMS, 600 Ω) 4x Control potentiometer MIDI in- and output I²C expansion port Multi-mode operation Power supply: 5 V DC USB or 7.5-12 V DC (barrel jack, center pin is GND) Current consumption (average): 200 mA Included 1x ESP32 Audio DSP FX Processor board (assembled) 1x ESP32-PICO-KIT 2x Jumpers 2x 18-pin headers (female) 4x 10 KB potentiometers Downloads Documentation GitHub

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Upgraded version II with Bluetooth function, larger battery capacity, built-in bandpass filter circuit and additional modes (HI-Z, LNA, 50 ohm) The ATS25 max-Decoder II is a portable, full-band MW/LW/SW/Ham/FM radio receiver based on the Si4732-A10 HF transceiver with DSP technology. The extremely compact and lightweight receiver has several built-in signal decoding modes including CW, RTTY, HELL, FT4, and FT8, making it an indispensable unit for radio amateurs. Features Rotary control or touch-screen user interface Automatic antenna input switching (BNC socket) Adjustable 500-6000 Hz bandwidth depending on modulation Real-time signal reception quality measurement and automatic search for radio stations based on received data 10 Hz minimum SSB frequency setting. 1 Hz BFO generator for precise tuning within ham radio bands RDS information decoding SSB reception Rapid frequency entry using two fast switching VFOs Unlimited station memory with grouping by reception range CB band channel mode Extensive setting and customization options Morse code decoding for Latin and Cyrillic alphabets DIGI modes decoding (RTTY, FELD-HELL, FT4, FT8) Decoded data saving, storage, and sending to a PC WiFi connectivity for updates and advanced decoding modes Updateable, ESP32-based, control software Supplied with preregistered licence key Specifications Display: 2.4-inch (net) color TFT with touch (320 x 240) Case material: aluminum alloy Built-in battery: 4000 mAh Lithium-ion (supports up to 6 hours of operation) Bluetooth Internal loudspeaker Headphones output (3.5 mm jack) VHF FM: 64-108 MHz with RDS MW: 520-1710 kHz LW: 153-500 kHz SW: 1730-30000 kHz Firmware version: 4.17 Air Power: USB-C Dimensions: 117 x 112 x 45 mm Weight: 380 g Included 1x ATS25 max-Decoder II Receiver 1x Wi-Fi antenna 1x Telescopic antenna 1x Stylus pen 1x USB-C charging/data cable 1x Dust cloth 1x Manual

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BeagleY-AI is a low-cost, open-source, and powerful 64-bit quad-core single-board computer, equipped with a GPU, DSP, and vision/deep learning accelerators, designed for developers and makers. Users can take advantage of BeagleBoard.org's provided Debian Linux software images, which include a built-in development environment. This enables the seamless running of AI applications on a dedicated 4 TOPS co-processor, while simultaneously handling real-time I/O tasks with an 800 MHz microcontroller. BeagleY-AI is designed to meet the needs of both professional developers and educational environments. It is affordable, easy to use, and open-source, removing barriers to innovation. Developers can explore in-depth lessons or push practical applications to their limits without restriction. Specifications Processor TI AM67 with quad-core 64-bit Arm Cortex-A53, GPU, DSP, and vision/deep learning accelerators RAM 4 GB LPDDR4 Wi-Fi BeagleBoard BM3301 module based on TI CC3301 (802.11ax Wi-Fi) Bluetooth Bluetooth Low Energy 5.4 (BLE) USB • 4x USB-A 3.0 supporting simultaneous 5 Gbps operation• 1x USB-C 2.0 supports USB 2.0 device Ethernet Gigabit Ethernet, with PoE+ support (requires separate PoE+ HAT) Camera/Display 1x 4-lane MIPI camera/display transceivers, 1x 4-lane MIPI camera Display Output 1x HDMI display, 1x OLDI display Real-time Clock (RTC) Supports an external button battery for power failure time retention. It is only populated on EVT samples. Debug UART 1x 3-pin debug UART Power 5 V/5 A DC power via USB-C, with Power Delivery support Power Button On/Off included PCIe Interface PCI-Express Gen3 x1 interface for fast peripherals (requires separate M.2 HAT or other adapter) Expansion Connector 40-pin header Fan connector 1x 4-pin fan connector, supports PWM speed control and speed measurement Storage microSD card slot, with support for high-speed SDR104 mode Tag Connect 1x JTAG, 1x Tag Connect for PMIC NVM Programming Downloads Pinout Documentation Quick start Software

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PÚCA DSP is an open-source, Arduino-compatible ESP32 development board for audio and digital signal processing (DSP) applications with expansive audio-processing features. It provides audio inputs, audio outputs, a low-noise microphone array, an integrated test-speaker option, additional memory, battery-charge management, and ESD protection all on a small, breadboard-friendly PCB. Synthesizers, Installations, Voice UI, and More PÚCA DSP can be used for a wide range of DSP applications, including but not limited to those in the fields of music, art, creative technology, and adaptive technology. Music-related examples include digital-music synthesis, mobile recording, Bluetooth speakers, wireless line-level directional microphones, and the design of smart musical instruments. Art-related examples include acoustic sensor networks, sound-art installations, and Internet-radio applications. Examples related to creative and adaptive technology include voice user interface (VUI) design and Web audio for the Internet of Sounds. Compact, Integrated Design PÚCA DSP was designed for portability. When used with an external 3.7 V rechargeable battery, it can be deployed almost anywhere or integrated into just about any device, instrument, or installation. Its design emerged from months of experimentation with various ESP32 development boards, DAC breakout boards, ADC breakout boards, Microphone breakout boards, and audio-connector breakout boards, and – despite its diminutive size – it manages to provide all of that functionality in a single board. And it dos so without compromising signal quality. Specifications Processor & Memory Espressif ESP32 Pico D4 Processor 32-bit dual core 80 MHz / 160 MHz / 240 MHz 4 MB SPI Flash with 8 MB additional PSRAM (Original Edition) Wireless 2.4 GHz Wi-Fi 802.11b/g/n Bluetooth BLE 4.2 3D Antenna Audio Wolfson WM8978 Stereo Audio Codec Audio Line In on 3.5 mm stereo onnector Audio Headphone / Line Out on 3.5 mm stereo connector Stereo Aux Line In, Audio Mono Out routed to GPIO Header 2x Knowles SPM0687LR5H-1 MEMS Microphones ESD protection on all audio inputs and outputs Support for 8, 11.025, 12, 16, 22.05, 24, 32, 44.1 and 48 kHz sample rates 1 W Speaker Driver, routed to GPIO Header DAC SNR 98 dB, THD -84 dB (‘A’ weighted @ 48 kHz) ADC SNR 95 dB, THD -84 dB (‘A’ weighted @ 48 kHz) Line input impedance: 1 MOhm Line output impedance: 33 Ohm Form Factor and Connectivity Breadboard friendly 70 x 24 mm 11x GPIO pins broken out to 2.54 mm pitch header, with access to both ESP32 ADC channels, JTAG and capacitive touch pins USB 2.0 over USB Type C connector Power 3.7/4.2 V Lithium Polymer Rechargeable Battery, USB or external 5 V DC power source ESP32 and Audio Codec can be placed into low power modes under software control Battery voltage level detection ESD protection on USB data bus Downloads GitHub Datasheet Links Crowd Supply Campaign (includes FAQs) Hardware Overview Programming the Board The Audio Codec

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