Yamaha Corporation

Kazuyuki Ito

Hiroyuki Iwase

Shigemitsu Yamaoka

Masahiko Hasebe

Hiroyuki Tsuchiya

Kenji Iwamoto

Kouichi Kashiwazaki

In response to detection of a note-on instruction, a CPU assigns a tone generating unit comprising two tone generating channels and sets tone color control data of the assigned tone generating unit into tone generator registers. The tone color control data includes a parameter common to the two channels. Once the CPU gives a tone generation start instruction to a tone generator, the tone generator accumulates a frequency number common to the two channels to thereby generate a progressive phase common to the two channels. Waveform readout section reads out left-channel and right-channel waveform data from a waveform memory on the basis of the phase and waveform selecting information of the left and right channels. Tone characteristics of the read-out left- and right-channel waveform data are controlled by a characteristic control section on the basis of a characteristic control parameter common to the two channels.

Tone generation apparatus

An image processing apparatus processes image data stored in a memory to thereby display an image on a display screen of a display unit under a control of a central processing unit (CPU). In one aspect of the invention, source data read from a source area of the memory are subjected to a rotation process and a logical operation and then converted to transfer data which will be written in a destination area of the memory by every word. In addition, first and last words within one line on the display screen are masked in accordance with predetermined first and second mask data. In another aspect of the invention, one of a wait mode and a not-wait mode is selected by wait control data outputted from the CPU. In the wait mode, the CPU is subjected to a wait state even in a memory read cycle. In the not-wait mode, the CPU is not subjected to the wait state normally in the memory read cycle. However, the CPU is subjected to the wait state in the not-wait mode while a reading operation of the memory has not been completed.

Apparatus for processing image data for displaying an image on a display

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Hamamatsu, Japan

Kazuyuki Ito