System Overview

The Audio Subsystem delivers high‑fidelity, immersive multichannel sound using DSP processing, multichannel Class‑D amplification, intelligent control modules, integrated surround sound, dynamic range control, EQ and crossover management, lip‑sync correction, and scene‑based presets.

• Cinematic surround sound
• Accurate audio reproduction
• Low distortion
• High dynamic range
• Seamless integration with all input sources

Audio Block Diagram

Input Sources

• HDMI eARC
• Optical TOSLINK
• Audio In (3.5 mm)
• Casting Audio (AirPlay / Chromecast)
• Media / App Audio

Signal Flow

• Inputs → System MCU (I/O Controller)
• Audio DSP (ADI SHARC)
• EQ / Crossover
• Surround Processing
• Volume Control
• Sync Control
• Scene Presets
• Clock & PLL (Low Jitter)
• Audio ADC/DAC (24‑bit / 192 kHz)
• Class‑D Amplifiers (FL/FR, Center, Surround, Surround Back, Subwoofer)
• Speakers (7.1 configuration)

System Specifications

Audio Configuration

• 7.1 / 5.1 / 3‑channel support

Max Output Power

• Front L/R: 2 × 30 W @ 8 Ω
• Center: 1 × 20 W @ 8 Ω
• Surround L/R: 2 × 20 W @ 8 Ω
• Surround Back L/R: 2 × 15 W @ 8 Ω
• Subwoofer (LFE): 1 × 60 W @ 4 Ω
• Total RMS Power: 240 W

Performance

• Frequency Response: 20 Hz – 20 kHz
• THD+N: < 0.05%
• Dynamic Range: > 100 dB
• Processing: 24‑bit / 192 kHz
• Surround Modes: Stereo, 5.1, 7.1, Movie, Music
• Volume Control: Digital (0–100)
• Lip‑Sync Adjustment: ±200 ms
• Audio Delay: ±200 ms

Protection

• DC
• Short‑circuit
• Clip limit
• Over‑current
• Over‑temperature

Audio Inputs

DSP & Audio Processing

DSP Engine

• ADI SHARC
• 32/40‑bit floating point

Processing Features

• 10‑band parametric EQ per channel
• High/Low pass filters
• Time alignment
• Loudness compensation
• Downmixing
• Dynamic range control
• Bass management
• Scene preset management

Amplifier Architecture

• High‑efficiency Class‑D amplifiers
• Low THD+N
• High damping factor
• Independent protection per channel
• Feedback‑controlled output stage
• Short‑circuit protection
• Over‑current protection
• Thermal feedback protection
• Soft‑start / mute control

Speaker Configuration & Power

Speaker Layout (7.1)

• Front Left
• Front Right
• Center
• Surround Left
• Surround Right
• Surround Back Left
• Surround Back Right
• Subwoofer (LFE)

Audio Signal Path (HDMI eARC Example)

• HDMI eARC (8‑ch / 192 kHz)
• Audio Decoder
• DSP (EQ / Surround / Delay / DRC)
• 24‑bit / 192 kHz DAC
• Class‑D Amplifiers
• Speakers (7.1 Channels)
• Lip‑Sync Adjustment

Equalizer & Crossover

• 10‑band parametric EQ per channel

Crossover Settings

• HPF: 80 Hz – 20 kHz
• LPF: 20 Hz – 500 Hz
• Slopes: 6 / 12 / 24 dB/oct
• Subwoofer LFE: 50 Hz – 200 Hz

Audio Modes & Presets

• Stereo
• 5.1 Surround
• 7.1 Surround
• Movie Mode
• Music Mode
• Custom (User EQ)

Volume & Dynamic Control

• Digital volume (0–100)
• Max volume limit
• Dynamic range compression
• Night mode
• Bass management
• Loudness compensation

Protections

• Over‑current
• Over‑temperature
• DC offset
• Short‑circuit
• Clip limit
• Auto‑mute on fault
• Auto‑recovery

Audio Output Connectors

• Front L/R
• Center
• Surround L/R
• Surround Back L/R
• Subwoofer Out
• RCA Line Out (Subwoofer)
• Speaker binding posts (all channels)

Audio ADC / DAC Specifications

Clocking

• Dedicated audio oscillator
• Low‑jitter PLL
• 24.576 MHz / 22.5792 MHz clocks
• Full DSP/ADC/DAC synchronization

Test & Diagnostics

• Audio output test (tone/sweep)
• Speaker impedance test
• Delay & lip‑sync test
• THD+N measurement
• Channel integrity test

Service Port (Audio)

• 3.5 mm diagnostic port
• Factory/service use only
• Audio logging
• DSP diagnostics

Engineering Notes

• Use high‑quality cables
• Ensure ventilation
• Avoid clipping
• Subwoofer placement affects performance

Revision History