| 摘要 |
Each of level meter block images 21 to 2m arranged on a touch panel display 1 displays, as a bar graph, respective signal levels of channels of a corresponding one of m blocks into which a plurality of channels are divided. The level meter block images 21 to 2m also serve as assignment selection buttons of an assignment selection portion 2. For each level meter block image, an image generation portion 8 generates not only an image of a bar graph but also an image which indicates respective color indicators of the respective channels such that, when a signal type of a channel indicates that there is a signal correlation between the channel and its neighboring channel, the channel has a color indicator of a connected shape shared with the neighboring channel, and synthesizes these images to output the synthesized image to an image display control circuit 3.
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