Abstract: An oscillator for generating a fundamental frequency signal and harmonic signal to provide multiple radio frequency signals. First and second bipolar transistors are differentially connected, and have base and collector terminals cross-coupled. A pair of inductors serially connect the collectors of the transistors to one terminal of a d.c. power supply source. A current source connects to the other terminal of the d.c. power supply source and to the emitters of the differentially connected transistor. A tuning capacitor connected between collector terminals establishes a resonant frequency for the oscillator. Crosscoupling is affected at a level that produces harmonic signals which can be used along with a fundamental frequency signal in numerous radio telecommunications applications.

Abstract: A call progress monitor for a computer telephone interface system. Energy detectors are connected to receive signals from a telephone line. A bandpass filter is connected to the telephone line, having selectable center frequency. A counter-timer connected to count clock pulses is reset by the energy detector and timing commences in response to the presence of a signal on the telephone line. The counter will result in a center frequency control means for the filter being slewed over a bandwidth of interest, in synchronism with the counting of the timer-counter. A signal detector connected to the filter indicates the presence of a pair of signal tones passing through the filter as it is slewed. Decoding means are connected to the counter-timer and the signal detector for generating a binary signal indicating the frequency of the bandpass filter which passes each signal tone. The binary signal is entered in a data register, and an interrupt posted to a host computer.

Abstract: A superheterodyne receiver is described for demodulating signals containing both amplitude and angle modulation components. An intermediate frequency signal is produced which is simultaneously amplitude detected as well as angle demodulated. Detector means are provided for detecting the occurrence of high negative amplitude modulation peaks of the broadcast signal. During high negative amplitude modulation peaks, the angle demodulator output is held at a fixed level until the amplitude of an input signal is restored to a predetermined minimum level.

Abstract: Apparatus is described for transmitting and receiving stereophonic broadcasts in the low frequency commercial AM broadcast band. A transmitter is described which modulates the phase and amplitude of a broadcast signal with separate information signals. A pilot tone may also be included to identify the transmission as stereophonic. Receiving means for detecting the PM and AM components to derive separate signals for stereophonic reception are included.

Abstract: Apparatus is described for transmitting and receiving stereophonic broadcasts in the low frequency commercial AM broadcast band. A transmitter is described which modulates the phase and amplitude of a broadcast signal with separate information signals. A pilot tone may also be included to identify the transmission as stereophonic. Receiving means for detecting the PM and AM components to derive separate signals for stereophonic reception are included.

Abstract: An improved filter is provided for separating two interleaved signals such as a television chroma and luminance signal. Means are provided for detecting when the chroma of a first line is uncorrelated with the chroma of a second line. The apparatus will respond to this detection so as to minimize the uncancelled chroma produced when a line of video signal is uncorrelated with the previous line of video information.

Abstract: Apparatus and method for establishing the proper signal levels for exciting the red, green, and blue inputs to a picture tube in a color television receiver are described. An R. F. signal for producing illumination of a limited portion of a color picture tube face is supplied to the color television receiver. Another signal, from the apparatus, is connected to the video amplifier of the receiver to maintain the picture tube light output level constant at one or the other of two predetermined levels. A plurality of photo diodes, color filters, and electrical circuits are used to monitor the level of red, green, and blue light produced in response to the signal. The proper color temperature is realized by adjusting the gainof the R, G, and B amplifiers while monitoring the respective levels of green, red and blue light produced by the picture tube.

Abstract: Apparatus is provided for automatically compensating for frequency drift in a digitally tuned varactor tuner. An Automatic Frequency Control signal for tuning the varactor tuner is produced in response to the direction of a tuning error. A signal level detector is used to inhibit the AFC signal when weak signals are being tuned by the varactor tuner thereby preventing continuous searching by the tuning system.

Abstract: Apparatus is provided for playing a video game from a location remote from a television receiver or other CRT display apparatus. Other devices are provided for generating position indicating signals for game markers and transmitting said signals to remotely located video game circuitry by means of an optical link. The remotely located game circuitry cause markers to be displayed on the CRT display in accordance with said position indicating signals.

Abstract: Method and apparatus for serial data transmission wherein each data word has a fixed bit length and each bit is transmitted during a fixed duration data period following a sync pulse. The sync pulse for each data word has a duration equal to a data period. Each data bit pulse has a duration less than a data period. The method and apparatus is particularly suitable for remote control systems for use with television receivers.

Abstract: Apparatus is provided for automatically peaking a luminance signal in response to the signal-to-noise ratio of a received signal. Manual adjustment means are also provided whereby the luminance signal may be "peaked" to increase the slope of transitions in the luminance signal, or "depeaked" whereby the slope of transitions of the luminance signal is decreased.

Abstract: An apparatus is described for automatically restoring the loss of high frequency components in the luminance signal of a television receiver. The luminance signal is continuously sampled and a signal representing the high frequency content in the luminance signal is used to alter the frequency characteristics of the luminance signal path so as to maintain the frequency spectrum of the luminance signal substantially constant. Additionally, the frequency alteration of the luminance signal path is made responsive to the dynamic level of the video signal to provide increased peaking in the gray picture areas relative to the higher level whites. The system also functions to reduce the upper video spectrum noise level.

Abstract: This invention relates to the television art. Specifically, apparatus for separating luminance and chroma information in a color video signal using comb filtering techniques is provided. Picture quality is enhanced by increasing frequency content while decreasing noise in the recovered chroma signals. Separation is achieved with a minimum compromise in vertical resolution.

Abstract: A low cost paperboard pallet is provided to transport delicate cargo such as television receivers and fine furniture in a safe manner. The invention allows a cargo to be secured and removed in an upright position avoiding any requirement to tip or support the cargo in an other than normal orientation.

Abstract: An audio control system for altering the frequency content of an audio signal with a d.c. control voltage. An audio signal is divided into a plurality of signal channels representing different portions of the audio signal frequency spectrum. Each signal channel is terminated by an attenuator which is responsive to a d.c. control voltage. The attenuated signals are then combined. By changing a d.c. control voltage a change in tone, volume, balance or loudness of an audio signal in a stereoamplifier or the like may be achieved.

Abstract: A remote control transmitter and receiver for controlling all of the usual viewer-adjustable functions of a television receiver. A plurality of key/switches permit the viewer to select the channel to be tuned and the function to be controlled. Digital logic circuits generate pulse coded signals that identify channel numbers or controlled functions. Function level control pulses are generated by rotation of a code wheel connected to a thumb wheel to provide proportional control of selected functions. The pulse coded signals and function level control pulses are transmitted via an infrared optical link to the receiver where companion circuitry decodes the pulse coded signals and adjusts the levels of selected functions in response to the function level control pulses.

Abstract: A light receiver for use in a light activated remote control system. A modified cylindrical lens having a wide horizontal acceptance angle and a narrow vertical acceptance angle is directly coupled to a photodetector. The resulting combination provides optical gain with a minimum compromise in directivity.

Abstract: Apparatus and method for generating a size-controllable, segmented character for use with a television receiver. The character generator can be used to display the television channel number to which a television receiver is tuned. Associated apparatus is provided for endowing a displayed character with a cursive slant. The apparatus controlling the size of the displayed character can be set to cause the character to continuously diminish, after a predetermined time, eventually disappearing.The character segments are defined by clocking apparatus related to the horizontal and vertical scan of a television display unit. In addition from horizontal and vertical clocks enabling all possible character segments, enabling signals are generated by the receiver apparatus specifying particular segments of a desired character.

Abstract: An all electronic tuning system is described for establishing a frequency of a local oscillator in a television receiver. When a channel selection is made, a number representing the desired channel is entered in a memory circuit. A first plurality of frequencies is generated in response to a channel selection, and a VCO employed as a local oscillator is caused to increase in frequency. When the VCO frequency differs from the first plurality of frequencies by a predetermined amount, a second plurality of frequencies is generated. Each frequency generated in said second plurality of frequencies is compared with said VCO frequency. When a predetermined difference exists between said VCO frequency and said second plurality of frequencies, a count is recorded. When the recorded count is equivalent to the number obtained in the memory circuit, the VCO tuning is inhibited and the VCO frequency is stabilized until a subsequent channel selection is made.

Abstract: An electrical signal distribution assembly for splitting an input signal into several output signals, comprising a uniquely constructed housing with integral connector shells and internal projections that fixedly hold a printed circuit board in place without requiring any screws, bolts, soldering or crimping operation. The connector assemblies are arranged in a manner to allow rapid assembly. The opening through which the printed circuit board is inserted is closed in a manner not requiring additional hardware.