Yamaha Corporation

Sanshin Kogyo Kabushiki Kaisha

Nippon Gakki Seizo Kabushiki Kaisha

Toshiaki Sato

Masatada Wachi

Kosei Terada

Kimihiro Nonaka

Tsuyoshi Futamase

Naota Katada

The present invention is an engine control for an internal combustion engine having at least one combustion chamber and an air/fuel charging system for delivering an air and fuel charge to the combustion chamber for combustion therein. The control includes an oxygen sensor associated with the combustion chamber, the sensor providing feedback data based upon the air/fuel ratio of the charge supplied to the combustion chamber. The control also includes at least one sensor for sensing a condition other than the air/fuel ratio in the combustion chamber which affects the output of the oxygen sensor. The control adjusts the air/fuel ratio of the charge delivered to the combustion chamber towards a target value based upon the output of the oxygen sensor, the control arranged to adjust the target value based upon the output of the at least one sensor sensing an operating condition other than the air/fuel ratio.

Engine control

An electronic musical instrument has a parameter setting system for setting a parameter necessary for controlling a musical characteristic which is a tone color or a musical effect such as a vibrato in a musical tone generating section. The parameter setting system comprises a memory (RAM) for storing a plurality of sets of parameters each set including, for example, a vibrato delay parameter and a vibrato speed parameter. When one of tone-color selection switches on a control panel is depressed, the set of parameters corresponding to the depressed tone-color selection switch are read and supplied to the musical tone generating section to thereby control the vibrato of the musical tone. The selected set of parameters in the RAM can be changed by the player through menu selection switches and data-up and data-down switches to desired values. The system may include a quit switch for restoring the set of parameters precedingly selected. The RAM may further store parameters for controlling another musical effect such as a tremolo. In this case, selection switches for selecting one of the vibrato and the tremolo are provided on the control panel, and parameters related to the selected musical effect are read from the RAM so that those parameters can be changed by the player.

Parameter setting system for electronic musical instrument

An electronic musical instrument has a musical tone signal forming circuit, an automatic rhythm generator rhythm selection switches, and a registration memory. The switches are used to select one of a plurality of rhythms. The automatic rhythm generator automatically generates a percussion instrument sound corresponding to a selected rhythm. In the registration memory, musical tone data respectively suitable for selectable rhythms are stored in advance. The musical tone signal forming circuit generates a musical tone signal representing a musical tone and further modifies the musical tone signal in accordance with the musical tone data corresponding to the selected rhythm, whereby a musical tone suitable for the selected rhythm can be generated.

Electronic musical instrument with automatic rhythm generating device

Growing community of inventors

Hamamatsu, Japan

Toshiaki Sato