79 lines
2.1 KiB
Markdown
79 lines
2.1 KiB
Markdown
# ADR-001: Audio Processor as Audio Domain Master
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- Status: Accepted
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- Date: 2026-08-01
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- Decision Type: Architecture
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## Context
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HubAudio is designed as a modular digital audio platform integrating several
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audio sources and destinations:
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- System Controller streaming subsystem
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- Radio Receiver radio receiver
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- Bluetooth RX/TX modules
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- Digital audio converters
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- Analog CODEC/DAC stages
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The system requires a central component responsible for:
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- digital audio routing
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- DSP processing
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- timing synchronization
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- audio stream management
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The Audio Processor has been selected as the central audio processor.
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## Decision
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The Audio Processor is the master component of the HubAudio Audio Domain.
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The Audio Processor is responsible for:
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- DSP processing
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- audio routing
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- digital mixing
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- signal processing
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- audio clock generation
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- synchronization of external audio peripherals
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The Audio Processor is the sole timing and routing master of the Audio Domain.
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The System Controller participates in the Audio Domain as a digital audio source. It does not act as the audio timing master or routing controller. Its role inside the audio domain is equivalent to other digital audio sources.
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The System Controller has a dual role:
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- audio source inside the Audio Domain
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- system supervisor inside the Control Domain
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It operates as system supervisor and is responsible for:
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- network connectivity
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- user interface
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- configuration management
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- firmware update management
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- system control
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## Consequences
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### Positive
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- Single audio timing reference
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- Deterministic audio routing
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- Reduced clock synchronization complexity
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- Easier debugging and expansion
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- Clear separation between control domain and audio domain
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### Negative
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- External audio devices must support slave clock operation
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- Clock distribution becomes a critical design element
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- Peripheral selection must consider I2S synchronization requirements
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## Rationale
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The Audio Processor is selected not only as a DSP processor but as the central
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controller of the digital audio domain.
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This decision defines the HubAudio architecture.
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