In this paper we propose a long-term prediction method for low delay transform domain general audio coders. This Frequency Domain Joint Harmonics Prediction (FDJHP) method operates directly in the Modified Discrete Cosine Transform (MDCT) domain and can enhance the coding efficiency, even under very low frequency resolutions. We compare this new method with state-of-the-art MDCT based methods by analyzing bitrate savings and by a listening test using test signals with strong harmonic components. The results indicate that it outperforms an existing method, which also directly operates in the frequency domain. Additionally, we show how it can be combined with the existing techniques into an adaptive system, where the different methods can complement each other.

中文翻译：

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低延迟通用音频编码的频域长期预测

在本文中，我们提出了一种用于低延迟变换域通用音频编码器的长期预测方法。这种频域联合谐波预测 (FDJHP) 方法直接在修正离散余弦变换 (MDCT) 域中运行，即使在非常低的频率分辨率下也能提高编码效率。我们通过分析比特率节省和使用具有强谐波分量的测试信号进行的听力测试，将这种新方法与最先进的基于 MDCT 的方法进行比较。结果表明，它优于现有的方法，该方法也直接在频域中运行。此外，我们展示了如何将其与现有技术结合到一个自适应系统中，其中不同的方法可以相互补充。