引导式测验 · 硬 等级
音频测验的恒定 Q 变换
了解 CQT 频率间隔、窗口长度、音高关系以及音频分析的实现选择。
问题 1 的 8
恒定 Q 变换中的频率仓是如何间隔的？
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- 恒定 Q 变换中的频率仓是如何间隔的？
- 对数，与音高匹配
- 线性、均匀（以赫兹为单位）
- 随机
- 仅在 1000 Hz 的倍数下
- Constant-Q 中的“Q”指的是什么？
- 通道数
- 品质因数：中心频率与带宽之比，保持恒定
- 音频缓冲区队列
- 量化级别
- 为什么 CQT 在低频下使用较长的分析窗口？
- 为了节省内存
- 因为低频声音较大
- 为了实现更精细的频率分辨率，其中音符间隔很近（以赫兹为单位）
- 添加混响
- What happens to a CQT pitch pattern when a chord is transposed up one octave?
- It becomes a single DC component
- Its bins shift by a different amount at each note
- It becomes identical in absolute bin locations without shifting
- It shifts upward by one octave’s fixed number of frequency bins
- 每个八度音阶通常使用多少个 CQT bin 来与半音对齐？
- 12
- 3
- 100
- 1000
- How does the documented librosa CQT implementation compute the transform?
- By computing each filter from scratch with no shared processing
- With a recursive subsampling method
- By recording the audio twice
- By ignoring all low frequencies
- What does a chroma-CQT representation do with bins from different octaves?
- It discards all pitch information
- It converts audio into RGB images
- It folds them into pitch classes
- It assigns each bin a speaker identity
- What does one column of a time-frequency CQT matrix typically represent?
- A complete MIDI score
- A 3D camera pose
- A single global loudness score for the whole recording
- CQT coefficients across frequency bins for one analysis frame in time