Abstract: A real time analyzer is disclosed and is adapted to determine the frequency response of a frequency dependent system based on a statistical average of the real time input and output signals of the frequency dependent system, distinguishing between "valid" and "invalid" data as those terms are predefined, so that the response can be measured with any arbitrary input signal to the frequency dependent system.

Abstract: A fixed, mechanical condenser sub-cooler for a refrigeration system which increases the efficiency of the system is provided. The sub-cooler includes a shell defining a chamber having a spray bar mounted therein through which high pressure liquid refrigerant is passed such that its pressure is reduced so as to cool the liquid refrigerant. The sub-cooler is positioned in the high pressure liquid line prior to a metering device such as an expansion valve.

Abstract: A device is disclosed for converting an input signal to a digital output signal at a preselected sampling rate with an increase in dynamic range without aliasing. The preferred embodiment utilizes a converter for producing a low resolution digital signal at a higher frequency and an averaging digital filter arrangement for increasing the resolution at the preselected sampling rate. The device is easily capable of producing digital output signals of at least 17 bits at any frequency such as 48 KHz.

Abstract: A network operates in the log domain so as to filter logarithmic signals and has a signal-controlled variable system frequency response. A method is also described for constructing such networks so that they function substantially identical to equivalent RC networks.

Abstract: A rocket retention and ignition system including in one embodiment, a linearly movable rocket retaining and firing pin biased by a spring to an extended position within the launch cavity of a rocket launcher tube. An electrically actuable solenoid, upon the application of an actuating signal pulls the pin to a withdrawn position so that its retaining end is flush with the inside wall of the launcher tube. A firing contact on the pin, designed to mate with a similar firing contact within the rocket, conducts a firing signal for igniting the rocket. An electronic control system generates a firing signal on a line electrically coupled to the pin firing contact and a solenoid actuating signal coupled to the solenoid with appropriate timing so that the firing signal is applied followed after a predetermined interval of time by the solenoid signal. In another embodiment, there are provided separate firing and retaining pins.

Abstract: An improved system for and method of testing a transistor for its V.sub.be -I.sub.c characteristics independent of temperature is disclosed. The system for carrying out the method comprises means for generating a first signal which varies with temperature in accordance with the base-to-emitter voltage of the transistor as a function of temperature and means for generating a second signal which varies with temperature in accordance with the transconductance gain of the transistor as a function of temperature. Means are provided for modifying at least one of the first and second signals so that as modified the two signals vary with temperature in an equal and opposite manner to one another. The system also includes means for adding the two signals as modified so as to provide an output signal representative of the V.sub.be -I.sub.c characteristics of the transistor independent of temperature.

Abstract: Amplification means responsive to an input signal of a gain control circuit is utilized in each log-antilog transmission path of the gain control circuit so as to provide in each path signal gain as a function of said input signal.

Abstract: An improved equalizing system for modifying an input electrical signal representative of original sound so as to correct for the inherent nonflat frequency response of an audio signal processing apparatus and the acoustic effects of listening environment in which the loudspeaker system of the audio signal processing apparatus may be disposed. The improved equalizing system includes a comparator for comparing the signal energy in each of a plurality of select frequency bands of a predetermined frequency range of the input signal with that of the corresponding signal energy in a like plurality of bands of a like range of a second signal representative of the acoustic output of the loudspeaker system and as a function of the nonflat frequency response and the acoustic effects of the environment. A correction signal representative of the comparison is used to modify the energy within each band of the input signal so as to substantially correct for the nonflat response and the acoustic effects of the environment.