DDSP Differentiable Audio Synthesis Quiz

Answers and explanations appear as you take the quiz.

1. What is the key innovation behind DDSP?
   • It makes classic DSP components differentiable so gradients flow through them
   • It predicts every audio sample directly like WaveNet
   • It only works with MIDI files, never audio
   • It replaces all signal processing with random noise
2. In DDSP, what does the neural network actually output?
   • Raw audio waveform samples one by one
   • Interpretable control signals like pitch, loudness, and harmonic amplitudes
   • Compressed MP3 bitstreams
   • Genre labels for the audio
3. Which two core sound-generating components does DDSP's spectral synthesizer combine?
   • A camera and a microphone
   • A text encoder and an image decoder
   • A harmonic oscillator bank and a filtered noise generator
   • Two identical drum machines
4. Why can DDSP achieve high quality with relatively small models and little data?
   • It memorizes the entire training set
   • It uses billions of parameters by default
   • It avoids training entirely
   • It bakes the physics of sound (DSP structure) into the architecture
5. What loss function does DDSP use to compare generated and target audio robustly?
   • A multi-scale spectrogram loss across several FFT sizes
   • Counting matching characters in filenames
   • Pixel-by-pixel image difference
   • Number of detected beats per minute
6. What expressive application does DDSP famously enable by separating pitch, loudness, and timbre?
   • Translating audio into French text
   • Timbre transfer, e.g. rendering a sung melody as a violin
   • Detecting plagiarism in essays
   • Compressing video files
7. What does DDSP’s harmonic oscillator bank generate?
   • A textual description of the audio
   • A noise-only signal with no pitch structure
   • A sum of sine-wave partials at integer multiples of the fundamental frequency
   • A list of MIDI instrument names
8. What does DDSP’s filtered-noise path contribute to synthesis?
   • The exact MIDI note sequence
   • A second copy of the harmonic oscillator output
   • A guarantee that every sound is periodic
   • Noise-like, inharmonic details such as breathiness