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US 4,984,276 AGranted
Digital signal processing using waveguide networks
AssigneeThe Board of Trustees of the Leland Stanford Junior University
InventorJulius O. Smith
Life of this patent
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Abstract
Disclosed is a signal processor formed using digital waveguide networks. The digital waveguide networks have signal scattering junctions. A junction connects two waveguide sections together or terminates a waveguide. The junctions are constructed from conventional digital components such as multipliers, adders, and delay elements. The signal processor of the present invention is typically used for digital reverberation and for synthesis of reed, string or other instruments.
Claims16
A digital reverberation system comprising:
- a branched network including a plurality of branches formed of digital waveguides and a plurality of junctions interconnecting the waveguides, wherein:
- each waveguide includes two digital delay lines running parallel to each other for propagating signals in opposite directions and having a first end and a second end, said first end having an input to a first delay line and an output from a second delay line and said second end having an input to the second delay line and an output from the first delay line, each waveguide having at least one of its ends connected to a junction;
- at least one of the junctions has at least three waveguide ends connected to it and signals arriving at each junction from a particular waveguide end are partially transmitted to every other waveguide end connected to the junction and partially reflected back to said particular waveguide end;
- means for introducing losses into signals propagating in the network;
- input means for providing an audio input signal to be reverberated to the network;
- and
- output means for providing at least one reverberation output signal from the network.
4 more elements
A reverberation system comprising:
- a branched network including a plurality of branches formed of waveguides and a plurality of junctions interconnecting the waveguides, wherein:
- each waveguide includes two signal paths running parallel to each other for propagating signals in opposite directions wherein at least one of the paths includes a delay, each waveguide having a first end and a second end, said first end having an input to a first path and an output from a second path and said second end having an input to the second path and an output from the first path, each waveguide having at least one of its ends connected to a junction;
- at least one of the junctions has at least three waveguide ends connected to it and signals arriving at each junction from a particular waveguide end are transmitted by a predetermined amount which may include zero to other waveguide ends connected to the junction and reflected back by a predetermined amount which may include zero to said particular waveguide end;
- means for introducing losses in o signals propagating in the network;
- input means for providing an audio signal to be reverberated to the network;
- and
- output means for providing a least one reverberation output signal from the network.
4 more elements
Dependencies are inferred from the claim text.