Wi-Fi Conference System

Supported SoCs

SoC

RTL8721Dx

RTL8720E

RTL8713E

RTL8726E

RTL8730E

Wi-Fi Conference System

Y

N

N

N

Y

Overview

Ameba Wi-Fi Conference System is a solution developed for wireless audio applications. It operates in 5GHz portion of the Wi-Fi spectrum and is capable of transmitting 6 independent 48kHz PCM audio channels with ultra low latency and extremely low synchronization between recorders. The solution is an ideal choice for conference systems. It includes the following features:

  • High Quality Audio: Audio can be delivered with 48kHz sample rate. By adopting a lossless format, the solution achieves negligible THD+N levels, preserving original audio quality with near-perfect accuracy.

  • Ultra Low Latency: Ultra-low fixed latency ensures perfect audio-video synchronization. The latency meets the ITU-R BT1359-1 specification.

  • Inter-channel Synchronization: An extremely low delay between different wireless channels ensures a high quality audio experience.

  • Robust Wireless Transmission: A series of technology is employed to deliver strong interference resistance and robust performance.

../../_images/wifi_conference_system_overview.svg

Description

The Ameba Wi-Fi Conference System solution enables wireless audio transmission with one receiver and multiple transmitters connected via standard 5GHz Wi-Fi. The receiver manages all connected transmitters, receiving audio data from Wi-Fi and playing it back, while the transmitter handles audio recording.

Audio Source Input

Transmitters are responsible for receiving audio data from the host controller and transmits it to receiver via standard Wi-Fi. Currently transmitters support bellowing audio input interfaces:

../../_images/wifi_conference_system_audiosource.svg

I2S Interface

Most of transmitters use I2S interface to receive audio data. The I2S interface supports:

  • Master and slave mode operation

  • Supports up to 6 channels per I2S (Based on the total number of channels received by the receiving end, the receiving end can receive up to 6 channels of data simultaneously)

  • Sampling rates up to 48kHz

  • Multi-I/O and TDM modes supported

Self-test Audio

  • Built-in single-tone audio generation for transmission to receiver

  • Useful for development and factory testing

Audio Transmission

Transmitters receiving audio data from host, sends it to receiver via standard Wi-Fi. The system uses lossless audio formats with advanced technologies for stable transmission.

Audio Specifications

  • Format: Lossless PCM data.

  • Quality:

    • THD+N < 0.001%

    • Frequency response: 20Hz-20kHz < 0.5dB

  • Channels: Up to 6 (Total number of channels is determined by the receiver actually receives.)

  • Hi-Res Support:

    • 48kHz

    • 24bit resolution

../../_images/wifi_conference_system_thd_freq.svg

Latency Performance

  • Fixed 15ms end-to-end latency (I2S input to I2S output)

  • Meets ITU-R BT1359-1 lip-sync standards

  • Unaffected by:

    • Number of channels

    • Number of transmitters

    • Transmission distance

../../_images/wifi_conference_system_latency.svg

Synchronization

Each transmitter and channel maintains extremely low synchronization error (less than 1 audio sample).

  • Ultra-low synchronization error (< 1 audio sample)

  • Inter-device sync accuracy: ±20.8μs

  • Maintained across all receiver and transmitters (if configured for playback)

../../_images/wifi_conference_system_sync.svg

Robust Wireless Transmission

In wireless audio transmission, stability and reliability are of utmost importance. The system employs multiple technologies to guarantee reliable audio transmission.

  • Interference Mitigation:

    • 5GHz band (5.1GHz ~ 5.8GHz)

    • Automatic channel selection

    • Adaptive frequency hopping

  • Error Handling:

    • Error Correction Code (ECC)

    • Packet Loss Concealment (PLC)

../../_images/wifi_conference_system_robust_trx.svg

Device Networking

Ameba Wi-Fi Conference System provides flexible ways for application to accomplish the network pairing between transmitters and receiver.

Bluetooth Configuration

  • Quick network pairing via BLE

  • SDK handles all Wi-Fi connection steps

  • Only requires SSID specification

Custom Configuration

  • Supports application-provided Wi-Fi SSID

  • SDK establishes connection using custom credentials

Device Management

Wi-Fi Conference System normally includes serveral transmitters. To manage these transmitter devices, Ameba Wi-Fi Conference System provides several interfaces for application to control and get device information.

  • Centralized control through receiver

  • Real-time device status notifications

  • Custom messaging between devices

System Features

OTA Updates

  • Simultaneous updates for receiver and all transmitters

  • Fast upgrade completion

Power Management

  • Transmitters and receiver support sleep mode

  • Remote wake-up capability for transmitters