Overview

The Octal output features inspired FreeDSP OCTAVIA to its name. This uses Analog Devices ADAU1452 or ADAU1466 DSP for Standalone Audio processing. An USBi-compatible programmer or TCPi via Raspberry-Pi's I2C port path is provided for DSP/EEPROM programming. The Raspberry-Pi is just an option, so if you do not need it, you can leave it and program the DSP/EEPROM via the USBi Connector.

Output Sections:

The output can configure the following types...

• 8ch Balanced output for XLR-Connector
• 8ch RCA-pin Differential Output
• 8ch Unbalanced RCA-pin output

Example Measured Optical S/PDIF Input to CH2 Analog Output Audio Performance (ver0.33j Board)

Input section

Various source capabilities are as follows...

• RCA-pin Analog Input (Unbalanced)
• Optical(TOSLINK) S/PDIF Digital Audio Input
• Coaxial S/PDIF Digital Audio Input
• Amanero Combo384 or compatible USB-I2S Input Slot
• Raspberry-Pi 40pin I2S Audio and I2C Interface
• Extra I2S Input header for the future extension

Other Features:

DSP Related Features

• ADAU1452/1466 DSP for 2 in 8 out Audio Processing
• 2 LED indicators controlled by MP6 and MP7
• I2C(0x70) connected USBi Interface with Bus-switch
• 4 + 1(Master) Rotary Pots for AUX-ADC
• 4 steps + 1 mute level control Rotary switched Voltage Source for Input source selection
• LED source position indicator output header
• DSP Reset button
• YORK-ready design (from version 1.1)

Power Supply-Related Features

• Common mode filtered Reverse voltage protection for Burrel DC Input
• Restart/Shutdown button for Raspberry-Pi
• Independent Power switch for Raspberry-Pi
• Mains Power switch linked with Raspberry-Pi
• R/G/B Power Status indicator LED

USB Input-Related Features

• DSD protection mute control for Amanero Combo384

Raspberry-pi Related Features

• On-board power supply for Raspberry-Pi.
• Automatic enabled power-off delay feature for Raspberry-pi shutdown.
• IR Remote sensor for Raspberry-Pi
• I2C pin header for external character display control.
• FTDI USB-Serial Console Cable header.

Continue to ...
-> Schematic Design Page
-> Custom Enclosure Building
-> Example SigmaStudio Projects
-> Configuring the DSP and EEPROM
-> Board Workarounds
-> Change Order List