Abstract: Apparatus for detecting multiple spectral bands, individually or concurrently, using linear detector arrays (30, 36). The system employs a beamsplitter (12) to divide the optical source (10) into two or more optical beams (24, 32), which beams are directed at the linear detector arrays (30, 36). Filter trays (38, 40) are positioned in the focal planes of the optical beams (24, 32) so that the beams pass through the filter trays prior to impinging upon the detector arrays (30, 36). Multiple filters (42, 44, 46, 48, 50, 52) are placed on the filter trays (38, 40). Linear actuators (62, 64) positioned adjacent the filter trays (38, 40) translate the trays across the focal planes of the optical beams (24, 32) so that individual filters are positioned in the path of beams, such that those frequencies of the beams that fall within the spectral ranges of the individual bandpass filter through which it passes may be detected by the detector arrays for further examination and analysis.

Abstract: A system is disclosed for recording incoming, numerically-encoded telephone messages generated by a caller via his touch-tone or rotary dial, and successively visually displaying the messages at the called telephone. The system includes an answer actuator for capturing the telephone line in response to an incoming ringing signal, and a memory circuit for storing incoming messages. Each numerically-encoded message is stored as a data set having a predetermined number of digits in a memory capable of storing several messages. In response to read-out command signals, the messages are successively transferred to a visual display. Each message may represent a telephone number where the caller can be reached, or other information such as a numerically-encoded instruction or message.