Example Applications

Note

All projects should be compiled with SigmaStudio 4.7
Some of the cases need to reload the SourceLUT.TXT into the LookupTable 1 Block.

---

Common ASRC Setting

Every input signal is matched to DSP core processing fs which is converted by integrated ASRC.

---

Special Passthrough Project for Audio Measurement

Overview

This is a special implementation just for measuring performance. No Volume control is available.

Sampling Rate

96kHz

Controls

• Source Selection Only
• Controls none

Input Sources (Most Left to CW)

• Raspberry-pi
• Amanero Combo384 or Compatibles
• S/PDIF Coax or Optical
• RCA Analog

Output

• 0/1
• 16/17
• 32/33
• 40/41
• S/PDIF Optical
  (All outputs are the same L/R sources)

Schematic Diagram

SigmaStudio Project File

https://github.com/freeDSP/freeDSP-OCTAVIA/blob/main/SOURCES/SigmaStudioProj/DSP-OCTAVIA_JustThru.dspproj

---

Desingn Template Project

Overview

This is just a sample project where you can start your design implementation. Master Volume and Gain-Trimer x4

Sampling Rate

96kHz

Controls

• Master Volume (AUX0)
• Gain Trim1 (AUX1)
• Gain Trim2 (AUX2)
• Gain Trim3 (AUX3)
• Gain Trim4 (AUX4)

Input Sources (Most Left to CW)

• Raspberry-pi
• Amanero Combo384 or Compatibles
• S/PDIF Coax
• S/PDIF Optical
• RCA Analog

Output

• 0/1
• 16/17
• 32/33
• 40/41
• S/PDIF Optical

Schematic Diagram

SigmaStudio Project File

https://github.com/freeDSP/freeDSP-OCTAVIA/blob/main/SOURCES/SigmaStudioProj/DSP-OCTAVIA_Thru-Trim.dspproj

---

2way Channel Divider with Linkwitz PEQ Delay & Trim Control

Overview

This project divides stereo input sources into Woofer and Tweeter output. Additional subwoofer and FIll-Range output are provided. Each band output has its gain & delay trimming controls.

Sampling Rate

96kHz

Input Sources

• Raspberry-pi
• Amanero Combo384 or Compatibles
• S/PDIF Coax
• S/PDIF Optical
• RCA Analog

Output

• Tweeter (0/1), 48dB/oct, Linkwitz-Riley
• Woofer (16/17), 48dB/oct, Linkwitz-Riley
• Subwoofer (32/33), 48dB/oct, Linkwitz-Riley
• Full Range Analog (40/41)
• S/PDIF Optical (Full Range Analog)

Controls

• Master Volume (AUX0)
• Gain Trim AUX1 (Woofer Delay Trim)
• Gain Trim AUX2 (Woofer Output)
• Gain Trim AUX3 (Tweeter Delay)
• Gain Trim AUX4 (Tweeter Output)

Indicators

• LED(Red) -0.45dB FS
• LED(Green) -26dB FS

Schematic Diagram

SigmaStudio Project File

https://github.com/freeDSP/freeDSP-OCTAVIA/raw/main/SOURCES/SigmaStudioProj/DSP-OCTAVIA_2wayCrossover_with_Sub_DelayTrim.dspproj

---

3way Crossover Channel Divider with Delay Control

Overview

This project divides stereo input sources into LF, MF, and HF output. Additional FIll-Range output is provided. Woofer's gain and delay time are fixed. Midrange and Tweeter have their gain and delay time control.

Sampling Rate

96kHz

Controls

• Master Volume (AUX0)
• Midrange Delay Time Trim (AUX1) max 32 samples
• Midrange Gain Trim (AUX2)
• Tweeter Delay Time Trim (AUX3) max 32 samples
• Tweeter Gain Trim (AUX4)

Indicators

• LED(Red) -0.45dB FS
• LED(Green) -26dB FS

Input Sources

• Raspberry-pi
• Amanero Combo384 or Compatibles
• S/PDIF Coax
• S/PDIF Optical
• RCA Analog

Output

• 40/41 Tweeter (HPF, 48dB/oct, Linkwitz-Riley)
• 32/33 MidRange (BPF, 48dB/oct, Linkwitz-Riley)
• 16/17 Wooffer (LPF, 48dB/oct, Linkwitz-Riley)
• 0/1 Full Range Analog
• S/PDIF Optical (Full Range)

Features

• Low-end compensation type Parametric EQ (for Linkwitz EQ)

Schematic Diagram

SigmaStudio Project File

https://github.com/freeDSP/freeDSP-OCTAVIA/blob/main/SOURCES/SigmaStudioProj/DDSP-OCTAVIA_3wayCDSP-OCTAVIA_3wayCrossover_DelayTrim.dspproj

---

3way Crossover Channel Divider Delay-Time & Balance Control with EQ on Each Output

Overview

This project divides stereo input sources into LF, MF, and HF output. Additional Full-Range output is provided. All output has fixed EQ capabilities. Woofer, midrange, and Tweeter output have delay time control and Left/Right Balance Control.

Sampling Rate

96kHz

Controls

• Master Volume (AUX0)
• Woofer Delay Time Trim (AUX1) max 64 samples
• Midrange Gain Trim (AUX2) max 64 samples
• Tweeter Delay Time Trim (AUX3) max 64 samples
• Left/Right Balance Contol (AUX4)

Indicators

• LED(Red) -0.45dB FS
• LED(Green) -26dB FS

Input Sources

• Raspberry-pi
• Amanero Combo384 or Compatibles
• S/PDIF Coax
• S/PDIF Optical
• RCA Analog

Output

• 40/41 Tweeter (9.6kHz HPF, 48dB/oct, Linkwitz-Riley)
• 32/33 MidRange (BPF, 48dB/oct, Linkwitz-Riley)
• 16/17 Wooffer (1.9kHz LPF, 48dB/oct, Linkwitz-Riley)
• 0/1 Full Range Analog
• S/PDIF Optical (Full Range)

Features

• Response compensation EQ (on Each Output)

Schematic Diagram

SigmaStudio Project File

https://github.com/freeDSP/freeDSP-OCTAVIA/blob/main/SOURCES/SigmaStudioProj/OCTAVIA_3wayp1_1k9_9K6_EQ_BalanceTimeAdj.dspprojj

---

Electric Guitar Amplifier Simulator with Play Along Feature

Overview

This project was inherited from Stephan Moeller's VLOG](https://ez.analog.com/dsp/sigmadsp/f/q-a/112390/distortion-for-guitar-programmed-on-a-sigma-dsp-adau1452). Some additional features are added.

Sampling Rate

48kHz

Controls

• Master Volume (AUX0)
• Gain Control (AUX1)
• Chorus Effect (AUX2)
• Reverb Volume (AUX3)
• Guitar Sound Level (AUX4)

Guitar Input Level Indicators

• LED(Red) -0.45dB FS
• LED(Green) -26dB FS

Input Sources

• Raspberry-pi
• Amanero Combo384 or Compatibles
• S/PDIF Coax
• S/PDIF Optical
• RCA Analog for Electric Guitar (Better to add J-FET Source-Follower buffer or Hi-Z input equivalent)

Output

• 0/1 Full Range Analog
• S/PDIF Optical (Full Range)

Features

• Drive Gain Control
• NoiseGate
• Chorus Effect Volume
• Reverb Volume
• Cabinet Impulse Response (some variation xxxx.txt IR Data file attached)
• Additional pre-EQ

Schematic Diagram

SigmaStudio Project File

-> https://github.com/freeDSP/freeDSP-OCTAVIA/blob/main/SOURCES/SigmaStudioProj/OCTAVIA_DistortionGuitarPlayAlong_IR_2.dspproj
-> https://github.com/freeDSP/freeDSP-OCTAVIA/blob/main/SOURCES/SigmaStudioProj/OCTAVIA_DistortionGuitarPlayAlong_IR.zip

IMPULSE RESPONSE DATA Source

-> https://redwirez.com/pages/the-marshall-1960a-ir-pack