Automatic Notch + Frequency Shift
Coordinated notch and frequency-shift nodes provide configurable feedback suppression.
Audio DSP · 48 kHz / 24-bit · USB Tuning
2-In/2-Out Digital Feedback Suppression Module
A compact module for conference reinforcement, portable PA, active speakers and stage monitors. Two analog audio paths are processed independently with automatic notch filtering, frequency shift and detailed equalization for on-site tuning and product integration.
2 Analog Inputs / OutputsAIN1 / AIN2 to AOUT1 / AOUT2 can be configured independently
48 kHz / 24-bitDual-channel DSP audio processing architecture
10-Band PEQ per ChannelFrequency, gain, Q and filter type configured independently
USB + IIS + GPIOPC tuning, external ADC/DAC and five GPIO lines
CORE CAPABILITIES
Designed for feedback control and system integration
Both processing paths provide the same capabilities for stereo or independent sources. Key tuning and expansion interfaces can be configured for each project.
Dual-Channel 10-Band PEQ
Configure frequency, gain, Q and seven filter types independently per channel.
USB PC Tuning
Adjust parameters on site, export tuning data and archive project settings.
Peripheral and Interface Expansion
Support IIS external ADC/DAC, five GPIO lines and a 14-pin system interface.
PC SOFTWARE CONTROL
Dual-channel feedback suppression tuning workbench
Configure 10-band EQ, gain, frequency shift and automatic notch filtering for each channel. The response curve is calculated by the backend interface; this page provides a browser demonstration.
GainG
Frequency ShiftF
Automatic NotchN
AUDIO ARCHITECTURE
Dual-channel analog paths and DSP processing
AIN1 / AIN2 inputs enter the DSP after conversion, then pass through channel gain, phase reverse, frequency shift, automatic notch filtering and 10-band PEQ before AOUT1 / AOUT2 output. Both channels have the same capabilities and can be configured separately.
ANALOG INPUTAIN1 / AIN2Two analog audio inputs
48 kHz / 24-bitDual-channel DSPGain, reverse, shift, auto notch, 10-band PEQ
ANALOG OUTPUTAOUT1 / AOUT2To amplifiers, active speakers or downstream equipment
TUNING RANGE
Defined tuning parameter ranges
The ranges below come from the current firmware nodes and PC tuning tool for on-site adjustment and project archiving.
Tuning suggestion: Establish safe input gain and system volume first, then set phase and automatic notch filtering, and finish with PEQ for tonal and resonance correction.
INTERFACE & INTEGRATION
14-pin interface and integration notes
The module provides analog audio, USB, 5 V power and GPIO. IIS mode can connect external audio ADC/DAC devices for different system front ends and downstream paths.
Interface summary
| Analog audio | AIN1, AIN2, AOUT1, AOUT2, AGND |
|---|---|
| USB tuning | DP, DM for the PC tuning tool |
| Power | VCC_5V, GND |
| General control | GP1 to GP5 for buttons, LEDs or external status control |
| Digital audio | IIS mode for external ADC/DAC |
Hardware integration suggestions
- Route analog audio and AGND away from USB and digital clocks.
- Connect AGND and GND at a controlled single point according to the system grounding strategy.
- Route DP / DM as a short, matched USB differential pair away from analog inputs.
- Confirm GPIO functions, logic levels and external pull-up or pull-down requirements during hardware design.
Project confirmation items
External ADC/DAC selection, IIS timing, GPIO definitions, device save strategy and system grounding should be confirmed against the target hardware and firmware.
CONFIRMED SPECIFICATIONS
Confirmed specifications
Based on the current module description and firmware nodes. Dimensions, latency, SNR and other values not documented here are not public commitments.
| Input / Output | 2 analog inputs (AIN1 / AIN2) / 2 analog outputs (AOUT1 / AOUT2) |
|---|---|
| Audio processing | 48 kHz / 24-bit dual-channel DSP |
| Channel functions | Independent gain, reverse, frequency shift, automatic notch, 10-band PEQ, EQ bypass and reset |
| Tuning interface | USB PC tuning tool with parameter readout, export and project archiving |
| Expansion | IIS external ADC/DAC and five GPIO lines |
| Interface count | 14 pins |
| Supply | 5 V |
APPLICATIONS
For sound reinforcement systems prone to feedback
- Conference reinforcement, conference microphones and compact PA
- Portable PA, active speakers and stage monitor systems
- Dual-channel feedback suppression in amplifiers or audio front ends
- Products requiring USB PC tuning, parameter export and project archiving
Defined per project
ADC/DAC solution, IIS timing, GPIO functions, parameter save strategy, analog levels, frequency response, SNR, THD+N and operating temperature can be confirmed with the complete system design.
START A PROJECT
Integrate this module into your audio product
For interface definitions, USB tuning, IIS / GPIO configuration or project parameter tools, tell us about the application and expected quantity.