| 摘要 |
PURPOSE:To give a sufficient freedom to installation of the input device side to improve the operability, by connecting acoustically the main body side, where a processing device is stored, and the input device side, where an input device is stored, to make them cordless. CONSTITUTION:In an input device-side casing 2, the key code, which is encoded to a 4-bit binary, from a keyboard circuit part 2a is converted to 16 kinds of natural frequency by a converter 2c, and the output of the converter 2c is amplified in an amplifier 2d, and a speaker 2e is driven to generate sounds. Electric power to each circuit is supplied by a battery 2b. Sounds generated from the speaker 2e are received by a microphone 4 in a main body-side casing 1 and are amplified in an amplifier 1e and are inputted to a converter 1d. Received natural frequencies are converted to an inherent 4-bit binary number in the converter 1d, and this 4-bit binary number is transferred to an input/output interface of a processing device 1a. |
