Abstract: A polygon (FIGS. 4to 6) has unique physical dimensions, i.e., its radius (R8') is correlated to a tracking radius (R13')(where objects are scanned) by a rule which creates an improved linear tracking system with a constant optical path. The polygon is very useful for reading information, writing information, and tracking industrial products on a rotating carousel. When the polygon is mounted on the center of a rotating carousel, with no relative movement between the polygon and the carousel, it can perform accurate linear tracking of objects located on the carousel. The radius of the polygon is equal to half the tracking radius divided by the cosine of an angle of 180/n {Eq. (6)}, where n is an integer. The polygon can have an arbitrary number of sides. Using another method, the non-linearity of the system for an arbitrary polygon's radius can be corrected by a series of sensors [N1 to N4, FIG.

Abstract: A method for calibrating and improving linearity of a system for scanning moving objects. A type of scanning system and a set of parameters to define the scanning system are selected. A set of initial values for some of the parameters are also selected and mathematical equations are derived which describe physical movements of the scanning and relationships between the parameters. The equations are solved to find values for the parameters with which the objects are scanned by an incident light with linearity and a predetermined accuracy. The parameters of the scanning system are then set to the values obtained by solving the equations. The system itself consists of a rotating polygon (34) and a rotating carousel (42) having predetermined axes of their rotation. The polygon (34) has a plurality of facets (46) which are symmetric with respect to the polygon's axis of rotation. The carousel supports objects, such as bottles (36, 37, . . . 41) which also may have spinning motions.

Abstract: A circuit is connected to the line of a telephone for disabling the ringer (22) of the telephone and supplying, instead of the regular ring signal, any of a plurality of predetermined alternative signal melodies or voice messages. The circuit comprises a ring detector (24) for detecting the incoming rings, a relay (26) which is responsive to the rings for turning off the regular ringer, a signal library (28) for storing the predetermined alternative signals, and an amplifier (32) and a speaker (34) for reproducing the signals in an audible manner. Also a current detector (30) is provided to detect direct current flow when the telephone is answered and thereupon disable the alternative signal source. The alternative signal may be selected by the telephone user with a switch on the signal library, or by supplying predetermined tones to the circuit, either by the caller or the called party (FIG. 4).

Abstract: A digital data transmission system for transmitting selected periodic ones of real data samples and intermediate extrapolated data samples. The transmitting end of the communication system includes means for sampling periodic ones of an information signal, an extrapolator for estimating intermediate samples between the selected periodic real samples, correction means for generating a correction value based upon the difference between extrapolated data and real data samples, and transmitting means that transmit periodic ones of real data samples and intermediate correction values. The receiving end includes means for receiving selected real digital data samples and the correction values, and a second extrapolator for estimating intermediate samples between the transmitted real data samples.

Abstract: Apparatus for transmission of communications including apparatus for transmitting samples of an analog signal by conversion of such samples from their original frequencies to lower frequencies, extrapolating from the samples at the lower frequencies and reconverting the extrapolated samples to the original frequencies.

Abstract: Bit compression system for a telephone modem utilizing differential phase shift modulation of a low-frequency tone carrier to transmit dibit or tribit values. Instead of transmitting digitized samples of the tone carrier over a conventional T1 telephone network, the modem compression system tribit extracts the dibit or values from digitized samples of the tone carrier, and transmits assembled T1 data bytes in a data stream containing solely the data bits encoded by the modem. At the receiving end, a modem decompressor reconstructs the digitized samples of the tone carrier using the dibit or tribit values. The T1 telephone network then uses the reconstructed digitized samples to reproduce the analog tone carrier for the receiving modem. The modem compressing system also includes AGC circuit for normalizing the levels of the T1 data samples and a modem/voice data detector for alternately routing the T1 data samples to respective speech and modem compressors.

Abstract: Apparatus for transmission of information in digital form comprising apparatus for providing a plurality of signals coded into a multiplicity of digital code elements in accordance with a first modulation technique; and apparatus for providing a plurality of coded addresses for transmission, each of the coded addresses representing a digital code in accordance with a second modulation technique corresponding to a combination of code elements of individual ones of the plurality of signals.