Fundamental Tone Detection Or Extraction Patents (Class 84/681)
  • Patent number: 7518053
    Abstract: Beat matching for two audio streams extracts beats from each, computes a conversion ratio from one stream to the other stream by an initial beat alignment plus a stability-maintaining beat alignment. A variable resampling converter or time scale modifier adjusts one stream to align beats with those of the other (reference) stream. Thus for cross-fading two music streams the beats of the fading-in stream can be matched to those of the fading-out stream for a seamless transition.
    Type: Grant
    Filed: September 1, 2006
    Date of Patent: April 14, 2009
    Assignee: Texas Instruments Incorporated
    Inventors: Daniel S. Jochelson, Stephen J. Fedigan
  • Patent number: 7383186
    Abstract: In an apparatus for synthesizing a singing voice of a song, a storage section stores template data in correspondence to various expressions applicable to music notes. The template data includes first and second template data differently defining a temporal variation of a characteristic parameter for applying the corresponding expression to an attack note and a non-attack note, respectively. An input section inputs voice information representing a sequence of vocal elements and specifying expressions in correspondence to the respective vocal elements. A synthesizing section synthesizes the singing voice from the sequence of the vocal elements based on the inputted voice information. When the vocal element is of an attack note, the first template data is applied to the vocal element. Otherwise, when the vocal element is of a non-attack note, the second template data is applied to the vocal element.
    Type: Grant
    Filed: March 3, 2004
    Date of Patent: June 3, 2008
    Assignee: Yamaha Corporation
    Inventor: Hideki Kemmochi
  • Patent number: 5025703
    Abstract: An electronic stringed instrument employs a plurality of sensors or monitors for instrument performance. Preferred sensors or monitors include a detector for detecting that a string of the instrument is vibrated, an apparatus for evaluating a string-vibration strength or a string touch, an apparatus for discriminating a fret operation position on a fingerboard or a fundamental frequency of a vibration of the vibrated string, a tremolo arm sensor, and a string-bending sensor. These performance input parameters are assigned to various control functions for musical tones generated by a sound source and/or various control functions for effects added to these musical tones by an effector. The function assignment is preferably programmable. In an operation, a music control apparatus control the sound source and/or effector in response to a performance monitor so that musical tones for the strings can be distinguished from each other or effects for the musical tones can be distinguished from each other.
    Type: Grant
    Filed: October 7, 1988
    Date of Patent: June 25, 1991
    Assignee: Casio Computer Co., Ltd.
    Inventors: Akio Iba, Yoshiyuki Murata, Hajime Manabe
  • Patent number: 5018428
    Abstract: An electronic musical instrument extracts a pitch from an input waveform signal by a pitch extracting circuit, and directs a sound source circuit to generate a musical tone at the pitch based on the extracted pitch. The sound source circuit electronically generates musical tones at the pitches according to the performance. The pitch extracting circuit obtains fundamental period of the input waveform signal by detecting the time interval (t1) between these first two zero-cross points after two positive peak points of the input waveform signal are detected, by detecting a time interval (t2) between first two zero-cross points after two negative peak points of the input signal waveform are detected, or by detecting both the time intervals (t1, t2).
    Type: Grant
    Filed: February 12, 1990
    Date of Patent: May 28, 1991
    Assignee: Casio Computer Co., Ltd.
    Inventors: Shigeru Uchiyama, Katsuhiko Obata
  • Patent number: 4924746
    Abstract: Data representing a pitch is extracted from an input waveform signal and a musical tone having a corresponding tone pitch is generated. By chromatically designating a tone pitch, a musical tone having a tone pitch of a semitone unit is generated from a sound source circuit at the starting of the input waveform signal. After tone generation is started, in the system for updating a tone pitch having an interval of less than a semitone interval, a musical tone is generated in accordance with various performances. Therefore, a musical interval after tone generation is started can be clearly recognized, thus obtaining an excellent musical performance effect.
    Type: Grant
    Filed: December 9, 1988
    Date of Patent: May 15, 1990
    Assignee: Casio Computer Co., Ltd.
    Inventor: Katsuhiko Obata