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Audio Architecture
Purpose
Define the audio signal chain and performance direction for the retro-inspired IoT radio with modern streaming capabilities.
Product Context
- Wood-look tabletop radio concept
- Approximate product width: 220 mm
- Two front knobs
- Small center display
- Rechargeable battery option for unplugged operation
- Streaming-ready, WiFi enabled, Bluetooth capable
- Targeted for good perceived consumer audio quality in a compact enclosure
Audio System Goals
- Deliver clear, warm, room-filling audio for speech, music, and internet radio
- Support modern digital audio sources without requiring an analog tuning path
- Maintain acceptable performance on battery power as well as external power
- Fit within enclosure, front-panel, and thermal constraints implied by a compact wood-cabinet-style product
Functional Audio Requirements
- Support audio playback from network streaming sources
- Support Bluetooth audio playback
- Support local UI sounds and system feedback tones if desired
- Provide user volume control via front knob
- Support mute, pause, and source selection through the digital UI and/or knob interaction model
Proposed High-Level Audio Chain
- Wireless/digital source subsystem generates digital audio stream
- Main processing subsystem performs source management, decoding, and UI coordination
- Digital audio interface passes audio to dedicated audio output stage
- Power amplifier drives internal speaker system
- Optional headphone or line-level path may be considered in later revisions if industrial design permits
Speaker System Direction
- Prioritize a single-speaker or stereo compact architecture based on front-panel industrial design and internal volume allocation
- Tune for pleasant near-field and tabletop listening
- Favor enclosure-aware voicing over maximum output power
- Leave final driver size, count, and acoustic loading as an implementation decision during execution
Audio Quality Direction
- Good intelligibility for voice content
- Pleasant tonal balance for music playback
- Low audible idle noise
- Minimal digital artifacts during WiFi/Bluetooth activity
- Stable performance across USB-powered and battery-powered operation
Electrical Architecture Considerations
- Separate noisy digital power domains from sensitive audio domains where practical
- Include audio-appropriate power filtering and grounding strategy
- Consider amplifier efficiency carefully for battery runtime and thermal performance
- Ensure charging and wireless activity do not significantly degrade playback quality
User Experience Implications
- Volume response should feel smooth and predictable
- Source changes should be clearly indicated on the display
- Startup and reconnect behavior should avoid loud pops or abrupt transients
- Battery and charging states should be visible without distracting from playback UX
Mechanical and Layout Implications
- Speaker placement and display placement must coexist on the front panel
- Knob placement constrains PCB and control-board geometry
- Acoustic cavity and battery volume will compete for enclosure space
- Amplifier, wireless radios, display, and battery should be arranged to reduce EMI and audible interference
Open Decisions
- Mono vs stereo internal speaker architecture
- Whether to include a passive radiator, porting, or sealed acoustic approach
- Whether to include headphone output or line out
- Final amplifier class, output power target, and speaker impedance strategy
- Final display-audio coexistence and shielding requirements
Downstream Design Impact
This document informs:
- System architecture
- Power architecture
- Schematic partitioning
- PCB floorplanning
- Enclosure integration
- Audio performance validation
Purpose
Product Context
Audio System Goals
Functional Audio Requirements
Proposed High-Level Audio Chain
Speaker System Direction
Audio Quality Direction
Electrical Architecture Considerations
User Experience Implications
Mechanical and Layout Implications
Open Decisions
Downstream Design Impact