| 摘要 |
PURPOSE:To reduce operator's fatigue by changing the luminance of the screen of a display part and the gain-frequency characteristics of an acoustic signal in stages by operator's operation. CONSTITUTION:The digital data terminal equipment is constituted of an image signal transmitting camera 12, a display part 1, an acoustic signal transmitting microphone 18, an acoustic signal generating speaker 15, a luminance/acoustic characteristic interlocking change part 13, etc., to transmit/receive digital data through a branching circuit 50 from an external circuit. An luminance operation part 3 reduces the luminance of an image manually in stages and the interlocking change part 13 is constituted of a counter 16, a control circuit 19, etc., to change the gain-frequency characteristics interlocking with the operation of the luminance operation part 3. When the operator operates a characteristic changing direction part 3. When the operator operates a characteristic changing direction selecting part 4, the gain-frequency characteristics of the acoustic signal is switched and selected in stages every operation of the luminance operation part 3 in accordance with the reduction of the luminance.
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