Quasi-Periodic Locked Loop (Q-PLL)

# Record card
Thematic areas
Materials / Properties of materials, corrosion, degradation
ICT & Electronics / Sensor/multi-sensor technology, instrumentation
ICT & Electronics / Optics & Acoustic
ICT & Electronics / Robotics and control systems
Health & Biotech / Medical Device
Health & Biotech / Micro and nanotechnology related to biological sciences
Health & Biotech / Bio-medicals
ICT & Electronics / Electronics and microelectronics
ICT & Electronics / Information processing, information system, workflow management
ICT & Electronics / IT and Telematics applications
ICT & Electronics / Multimedia
ICT & Electronics / Telecommunications

The Q-PLL is a nonlinear circuit which can maintain a locked state when forced by two incommensurate frequencies.

The locked state is a third frequency parametrically selected among those prescribed by the theory of three-frequency resonances in dynamical systems.

In particular, the locked frequency forms a three-frequency resonance with the frequencies of the quasi- periodic input and is closely related to the pitch perception of complex sound in humans.

The circuit is able to lock also in case of deterministic perturbation (harmonics of the input frequencies) and stochastic perturbation (wide-band noise).It is also an extension of the Phase Locked Loop (PLL) with the additional ability of locking simultaneously to more than one frequency.

Business fields
Type of innovation
Product / process innovation in integration with an already existing technology
Description of innovative features / Competitive advantages

Due to the robustness of the locked states, the Q-PLL represents a basis for the development of applications, for example, in medicine (hearing aids, and cochlear implants), in robotics (artificial senses), and in industrial and consumer electronics (improvement of speech intelligibility, pitch- based processing, etc.). As an extension of the PLL, through further development and, it could find unexpected applications, which includes but also goes beyond those of the PLL and could generate a new family of nonlinear circuits for widespread application.

Reference market
Incremental innovation
Impacts on existing markets
Development stage
New product/process/service/technology
Patented technology

Italy, PCT

Technology validation/demonstration
External validation
Market positioning
Partner required
Private research center

For more information and/or to be put in contact with the Research Team, please contact the Project Manager:

Barbara Angelini - Project Manager
CNR - Unità Valorizzazione della Ricerca
Phone number 06.49932415
E-mail barbara.angelini@cnr.it