Landmark Graphics Corporation

Auburn Audio Technologies, Inc.

Other

Harold A Hildebrand

Joseph L Stiles

Cedric V Snyder, Jr

Kathleen M Whitfield

William E Good

Marie S Jansen

Aftab Alam

Peter Caragounis

In an un-tuned state, the strings of a string instrument are excited, and a standard adjustment factor is determined for each string. When a pitch is generated as a result of a string being strummed (e.g., during normal playing of the instrument), the pitch generated by the string is adjusted by the standard adjustment factor and an intonation adjustment factor that accounts for intonation errors. An adjusted pitch is output that is in-tune and has accurate intonation.

Virtual tuning of a string instrument

A device and method is disclosed to correct intonation errors and generate vibrato in solo instruments and vocal performances in real time. The device determines the pitch of a musical note produced by voice or instrument and shifts the pitch of that note to produce a very high quality, high fidelity output. The device includes a pitch detector that automatically recognizes the pitch of musical notes quickly. The detected pitch is then used as an input to a pitch corrector that converts the pitch of the input to an output with a desired pitch. The corrected musical note is then in tune with the pitch standard. The device and method employ a microprocessor that samples the signal from a musical instrument or voice at regular intervals using an analog-to-digital converter and then utilizes data derived from an auto-correlation function of the waveform to continuously determine the period of the waveform. The period of the waveform is then compared to a desired period or periods (such as found in a scale). The ratio of the waveform period and the desired period is computed to re-sample the waveform. This ratio is smoothed over time to remove instantaneous output pitch changes. The ratio is used to resample the input waveform. The resulting output waveform is processed through a digital-to-analog converter and output through audio interfaces.

Pitch detection and intonation correction apparatus and method

The present invention provides an efficient audio equalization system in terms of the number of coefficients and taps of a digital filter. The processing efficiency of the system allows it to provide audio equalization with high resolution at low frequencies using a 1/20-th the number of coefficients and taps in equivalent prior art systems. The resulting reduction in cost makes it economical to incorporate the system in hi-fi systems, home theaters, automobiles, televisions, etc. providing significantly improved sound quality with little or no overall increase in cost of production.

Method and apparatus for digital filtering of audio signals

A method for associating each descendent picked point with a parent seed point is disclosed which is used in a computerized method of automatically picking horizons from a three dimensional volume of seismic data traces. Such association of each and every point to each of its descendent picked points is recorded in computer memory. The method further includes displaying a path from a descendent picked point back to a starting seed point which led to its selection as a picked point.

Method and apparatus for finding horizons in 3D seismic data

A method of communication in a computer system is provided for transferring information between multiple, concurrently operating programs, each of which may have a respective window display. The user communicates with each of the application programs through the window display as well as through an input device, such as a mouse or keyboard. A list of information codes is registered with a dispatcher program for each of the application programs which requires data. One or more of the application programs generate templates which include data and a corresponding information code. The generated templates are transmitted to the dispatcher program. The dispatcher program then compares the information code in the received template to the registered list of information codes to find any matches and thereby identify the one or more application programs which have registered to receive the information in the received template. The dispatcher program then transmits the received template to each of the identified application programs. Information communication is therefore carried out between multiple operating programs without user direction for the steps of the communication process.

Method for information communication between concurrently operating

A method for associating each descendent picked point with a parent seed point is disclosed which is used in a computerized method of automatically picking horizons from a three dimensional volume of seismic data traces. Such association of each and point to each of its descendent picked points is recorded in computer memory. The method further includes displaying a path from a descendent picked point back to a starting seed point which led to its selection as a picked point.

A method and apparatus of rapidly generating horizon maps from a three dimensional volume of seismic traces is disclosed. During batch processing of the digital data representing trace wavelets, '1''s are '0''s are determined for each seismic trace of the volume. A bit volume is produced of which a '1' at a depth of a trace indicates that a horizon exists at that depth and at other depths of '1''s of adjacent traces which are within a predetermined depth. In a real time mode, an explorationist selects a seed point thereby identifying a '1' on a particular trace at a particular depth. An automatic scanning procedure finds all other '1''s at depths of adjacent traces. Each found '1' of adjacent traces is redesignated a seed point and the process is continued until no more '1''s can be found. A horizon map is created from the depths of each found '1'. An alternative method and apparatus is disclosed by which such bit volume is replaced with a compressed trace volume where each bit of the bit volume is replaced with a numerical value corresponding to the precise depth location of the attribute extremum represented by the bit. Such depth values are stored consecutively to form compressed traces. Interpolation of wavelets to find maximum or minimum attributes of such wavelets identifies depths above or below a bit of the bit volume which allows the production of an interpolated compressed trace volume.

A method of rapidly generating horizon maps from a three dimensional volume of seismic traces is disclosed. During batch processing of the digital data representing trace wavelets, '1''s or '0''s are determined for each seismic trace of the volume. A '1' at a depth of a trace indicates that a horizon exists at that depth and at other depths of '1''s of adjacent traces which are within a predetermined depth. In a real time mode, an explorationist selects a seed point thereby identifying a '1' on a particular trace at a particular depth. An automatic scanning procedure finds all other '1''s at depths of adjacent traces. Each found '1' of adjacent traces is redesignated a seed point and the process is continued until no more '1''s can be found. A horizon map is created from the depths of each found '1'. A record is maintained of parent and child bits whereby seed bits are designated as parent bits and each found bit is designated a child bit. Such parent-child information is useful in editing of horizon maps created by the method. Numerical attributes of the wavelets at the depths of the 1 bits are stored as a function of the depths of the bits, thereby reducing required storage space.

Growing community of inventors

Felton, CA, United States of America

Harold A Hildebrand