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Nuvoton AEC / NR operation flow

Agenda

• Test objective and environment checklist
• USB audio device enumeration
• GoldWave recording settings
• AEC / NR operation and capture flow
• Playback analysis (Stereo / Mono channel behavior)
• Pass criteria and troubleshooting notes

1. Test objective and setup

Test objective

• Verify that AEC / NR works correctly when EVB runs in USB UAC mode.
• Build a repeatable recording flow for before/after comparison.
• Avoid incorrect conclusions caused by channel settings (AEC / NR supports MONO only).

Lab setup checklist

• GoldWave release page: https://goldwave.com/release.php

2. USB connection and device check

1. Connect EVB to the PC through USB.
2. Confirm that the OS enumerates:
   • Speaker Nuvoton UAC
   • Microphone Nuvoton UAC
3. Confirm speaker and microphone paths are both active before recording.

Important
If Speaker and Microphone are not enumerated correctly, fix USB cable/driver/power issues first, then run AEC / NR tests.

3. GoldWave settings

In GoldWave, open Control related properties > Devices and set:

• Playback Device : Speaker Nuvoton UAC
• Record Device : Microphone Nuvoton UAC

This ensures both record and playback use the EVB audio path so AEC / NR behavior can be observed correctly.

4. AEC / NR recording flow

Recording procedure

1. Start recording.
2. Play background content (music, speech, or news) to simulate far-end audio.
3. Add near-end speech at the same time and observe echo/noise suppression in the recorded file.
4. Stop recording and save the WAV file.

5. Sample files and playback interpretation

Sample files

Playback observation

1. In default Stereo playback, background audio and voice can both be heard.
2. When switched to right channel (AEC / NR supports MONO only), voice content should be dominant.
3. Use channel switching to verify whether the algorithm output path matches expectation.

6. Validation points and troubleshooting

Validation note
Keep test conditions fixed (volume, distance, noise source) to compare AEC / NR performance across firmware versions fairly.

7. Summary

• Complete USB UAC enumeration and GoldWave device binding before test.
• Inject both far-end and near-end signals during recording to validate AEC / NR.
• Account for MONO support limitation during playback analysis.
• Keep one fixed sample set for regression comparison across firmware versions.

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Nuvoton AEC / NR 操作流程

議程

• 測試目標與環境檢查
• USB 音訊裝置列舉確認
• GoldWave 錄音設定
• AEC / NR 操作與錄製流程
• 回放分析（Stereo / Mono 聲道行為）
• 驗收條件與除錯建議

1. 測試目標與環境

測試目標

• 驗證 EVB 在 USB UAC 模式下，AEC / NR 是否可正常運作。
• 建立可重現的錄音流程，便於比較啟用前後差異。
• 避免因聲道設定造成誤判（AEC / NR 僅支援 MONO）。

實驗室環境檢查表

• GoldWave 下載頁：https://goldwave.com/release.php

2. USB 連線與裝置確認

1. 使用 USB 將 EVB 連接到 PC。
2. 確認作業系統已列舉出：
   • Speaker Nuvoton UAC
   • Microphone Nuvoton UAC
3. 確認喇叭與麥克風路徑都可正常使用，再進行錄音。

Important
若 Speaker 與 Microphone 未正確列舉，請先排除 USB 線材、驅動與供電問題，再進行 AEC / NR 測試。

3. GoldWave 設定

在 GoldWave 開啟 Control related properties > Devices，設定如下：

• Playback Device : Speaker Nuvoton UAC
• Record Device : Microphone Nuvoton UAC

此設定可確保錄音與回放都走 EVB 音訊路徑，才能正確觀察 AEC / NR 行為。

4. AEC / NR 錄音流程

錄音步驟

1. 開始錄音。
2. 播放背景內容（音樂、語音或新聞）模擬 far-end 音訊。
3. 同時加入 near-end 人聲，觀察錄音檔中的回音/噪音抑制效果。
4. 停止錄音並儲存 WAV 檔。

5. 測試檔案與回放判讀

測試檔案

回放觀察重點

1. 預設 Stereo 回放時，通常可同時聽到背景音與人聲。
2. 切到右聲道時（AEC / NR 僅支援 MONO），人聲會較為明顯。
3. 透過聲道切換，確認演算法輸出路徑是否符合預期。

6. 驗收重點與除錯建議

Validation note
請固定測試條件（音量、距離、噪音來源），以便公平比較不同韌體版本的 AEC / NR 表現。

7. Summary

• 測試前先完成 USB UAC 列舉與 GoldWave 裝置綁定。
• 錄音時同時注入 far-end 與 near-end 訊號，才能有效驗證 AEC / NR。
• 回放分析需考慮 MONO 支援限制，避免聲道誤判。
• 建議固定測試樣本，作為韌體版本回歸比較基準。

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