Download Towards Neural Emulation of Voltage-Controlled Oscillators Machine learning models have become ubiquitous in modeling
analog audio devices. Expanding on this line of research, our study
focuses on Voltage-Controlled Oscillators of analog synthesizers.
We employ black box autoregressive artificial neural networks to
model the typical analog waveshapes, including triangle, square,
and sawtooth. The models can be conditioned on wave frequency
and type, enabling the generation of pitch envelopes and morphing across waveshapes. We conduct evaluations on both synthetic
and analog datasets to assess the accuracy of various architectural
variants. The LSTM variant performed better, although lower frequency ranges present particular challenges.
Download Neural Sample-Based Piano Synthesis Piano sound emulation has been an active topic of research and development for several decades. Although comprehensive physicsbased piano models have been proposed, sample-based piano emulation is still widely utilized for its computational efficiency and
relative accuracy despite presenting significant memory storage
requirements. This paper proposes a novel hybrid approach to
sample-based piano synthesis aimed at improving the fidelity of
sound emulation while reducing memory requirements for storing samples. A neural network-based model processes the sound
recorded from a single example of piano key at a given velocity.
The network is trained to learn the nonlinear relationship between
the various velocities at which a piano key is pressed and the corresponding sound alterations. Results show that the method achieves
high accuracy using a specific neural architecture that is computationally efficient, presenting few trainable parameters, and it requires memory only for one sample for each piano key.
Download Fully Conditioned and Low-Latency Black-Box Modeling of Analog Compression Neural networks have been found suitable for virtual analog modeling applications. Several analog audio effects have been successfully modeled with deep learning techniques, using low-latency and conditioned architectures suitable for real-world applications. Challenges remain with effects presenting more complex responses, such as nonlinear and time-varying input-output relationships. This paper proposes a deep-learning model for the analog compression effect. The architecture we introduce is fully conditioned by the device control parameters and it works on small audio segments, allowing low-latency real-time implementations. The architecture is used to model the CL 1B analog optical compressor, showing an overall high accuracy and ability to capture the different attack and release compression profiles. The proposed architecture’ ability to model audio compression behaviors is also verified using datasets from other compressors. Limitations remain with heavy compression scenarios determined by the conditioning parameters.