Abstract: An audible tone identifier comprises a transducer and amplifier for responding to audible tones, such as generated by a human voice speaking or singing, or a musical instrument, and a plurality of filters sharply tuned to the notes of one or more octaves or fractions thereof of the equal tempered chromatic musical scale or to other patterns of sounds that are to be individually identified. The outputs of the filters are connected to lamp driver circuits which in turn are connected through transposing plug-and-jack connectors and sharp-and-flat insertion switches to lamps on a display board, whereby any musical tone within the range of the device, received by the transducer, will be identified visually on the display board by the lighting of a lamp.

Abstract: Apparatus for recognizing alpha-numeric indicia that are either printed or embossed such as are common to credit cards and other identification means for use in a data processing system. The optical reading apparatus scans a surface to be read using a read head that conducts light to and from the surface using light conducting rods. Photosensors at the emitting ends of light conducting rods detect changes in the level of light reflected from the surface. For recognizing indicia, the level of light is made to be directly related to particular portions of the alpha-numeric indicia being read. The entrance ends of the light conducting rods are strategically placed so that logic circuitry connected to the photosensors can convert the detected signal into machine language.