micheleandCursor
0e7d8449a9
Rename conflicting TikZ step style to drstep, add missing ch:firmware label, and use TeX Gyre Heros font fallback instead of Linux Biolinum O. Co-authored-by: Cursor <cursoragent@cursor.com>
48 lines
2.2 KiB
TeX
48 lines
2.2 KiB
TeX
\chapter{Introduction}
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\label{ch:introduction}
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DigiRadio is an open-source, high-fidelity digital radio receiver. It
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receives DAB+ and FM broadcasts, processes the audio through a dedicated
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signal processor, and streams the result over Bluetooth using a
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high-resolution codec. Firmware~0.8.4 on \texttt{main} provides encrypted
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storage, a tabbed configuration web UI, and the full REST API documented
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in Chapter~\ref{ch:api}. The whole project --- hardware and firmware --- is
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released as open source for the maker and audio community to study,
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build, and improve.
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\section{What DigiRadio is}
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Most DAB+/FM hobby projects stop at basic reception. DigiRadio adds two
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things that lift it into hi-fi territory: a real audio DSP stage for
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equalisation and mixing, and a premium-codec Bluetooth output. The result
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is a genuine wireless audio source rather than a bench demo, and, being
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fully documented, a practical reference for anyone learning multi-chip
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audio design or RF-aware PCB layout.
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\begin{drkey}[At a glance]
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A four-chip design --- Si4684 tuner, ADAU1701 DSP, ESP32-S3 host, and an
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FSC-BT1035 Bluetooth transmitter --- on a six-layer board, powered from
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USB-C, configured through an elegant web interface.
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\end{drkey}
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\section{Who this manual is for}
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This manual documents the system for someone building, flashing, or
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extending DigiRadio: the hardware at a block level
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(Chapter~\ref{ch:hardware}), the firmware architecture
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(Chapter~\ref{ch:firmware}), dedicated companion-chip guides for the
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Si4684 tuner (Chapter~\ref{ch:si4684}) and ADAU1701 DSP
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(Chapter~\ref{ch:adau1701}), FSC-BT1035 Bluetooth
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(Chapter~\ref{ch:bt1035}), the HTTP JSON API exposed by the web UI
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(Chapter~\ref{ch:api}), the per-class design reference that grows with
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the code (Chapter~\ref{ch:classes}), and how to build and flash
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(Chapter~\ref{ch:build}). Exact C++ signatures are generated by Doxygen
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from the source; this manual explains design, behaviour, and the
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reasoning behind it.
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\section{Licensing summary}
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The hardware is licensed under CERN-OHL-S v2 and the firmware under
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Apache-2.0; full details are in Chapter~\ref{ch:licensing}. The project
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repository is at \url{https://github.com/manvalan/DigiRadio}.
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