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AssigneeNippon Gakki Seizo Kabushiki Kaisha
InventorsTeruo Hiyoshi, Akira Nakada, Shigeru Yamada, Kiyoshi Ichikawa, Sigeki Isii
Estimating the term…
An electronic musical instrument is of a type wherein musical tone waveforms are stored in a memory as their sampled amplitudes and sequentially and repetitively read out to constitute tone waveforms. A key depression brings forth key code in a digital representation. This key code is used for reading out frequency information from a frequency information memory. The frequency informaton is accumulated to make an address signal for reading out the waveform memory. The read out waveform is reproduced as a musical tone through a tone-color and volume control circuit. This tone-color and volume control circuit is controlled keyboard by keyboard. The key code produced upon depression of the key contains a signal representing the kind of the keyboard to which the depressed key belongs. This signal is applied to a conversion circuit and converted to a signal representative of a different kind of keyboard. The output signal of the conversion circuit operates the tone-color and volume control circuit in a manner corresponding to the keyboard designated by the converted signal while the original signal representing the kind of the keyboard of the depressed key is applied directly to the tone-color and volume control circuit to operate it in a manner corresponding to the keybord of the depressed key. The manner of conversion of the signal representing the keyboard can be selected as desired. There is disclosed an example of a coupler effect between the upper and lower keyboard which can be produced by converting a signal for the upper keyboard to a signal for the lower keyboard while directly using the upper keyboard signal. Also disclosed is an example of a coupler effect between the lower keyboard and the pedal keyboard produced by converting a signal for the lower keyboard to a signal for the pedal keyboard while directly using the lower keyboard signal.
In an electronic musical instrument of a type having at least two keyboards, means for generating, in response to depression of a key in any one of said keyboards, a multibit key code containing certain note information bits identifying the musical note associated with the depressed key and having other keyboard information bits identifying the specific keyboard which contains the depressed key, and tone production means for producing a musical tone according to said key code and including note production circuitry for producing a musical note having a note frequency established by said certain note information bits, and tone color control circuitry, connected to the output of said note production circuitry, for controlling the tonal quality of the produced musical tone depending on the keyboard designated by said information bits, the improvement for providing a coupler effect comprising:
Dependencies are inferred from the claim text.