| 摘要 |
A musical toy which is arranged to read a pattern 44 of colour or shading and give as an output an audible tone includes a light emitter 12 and a light receiver 14, the light emitter being arranged to illuminate a discrete area of the pattern of colour or shading 44 and the light receiver being arranged to receive reflected light from that discrete area of the pattern. Thus as the toy is moved over the pattern 44, the amount of reflected light will vary. Means are provided (Fig. 1) to convert the light received to an electrical signal which is in turn converted to an oscillating signal whose frequency is proportional to the electrical signal and is in the audible range. The oscillating signal is used to drive a loudspeaker. Thus a child can reproduce a musical tune by moving the toy over a preselected pattern or colour or shading. <IMAGE> |
