Abstract: An apparatus and method are provided for identifying a call record of a telephone call to be moved from a source automatic call distributor to a destination automatic call distributor. The call record is of a type having been previously stored under a call identifier of the source automatic call distributor in a memory of the host computer serving both the source automatic call distributor and destination automatic call distributor in an area of the memory reserved for the source automatic call distributor. The method includes the step of storing a call action provided message in a call overflow table of the host computer including the call identifier of the telephone call and an identifier of the source automatic call distributor.

Abstract: A method and automatic call distribution system 100 for routing incoming telephone calls 206 from external telephonic units 102 to selected ones of a plurality of agents A1001-A1007 wherein the agents A1001-A1007 are grouped into skill groups 110a-110n are provided. Each of the skill groups 110a-110n is comprised of agents having a common agent-skill indicator. An agent-skill indicator being representative of a skill of the agent. Further, the agents in a skill group are arranged by length of time the agent has been available. An incoming telephone call 206 is initially assigned a call-skill indicator representative of a skill deemed useful in satisfying a need of the external caller. The call-skill indicator is then matched to a common agent-skill indicator of one of the skill groups. The telephone call is routed to the available agent in the matched skill group having been available the longest time.

Abstract: A video communications system 100, a video switching system 108 and method are provided for establishing video communications with a video communications device 104 utilizing the agent selection and reporting features of an automatic call distributor (ACD) 102. The ACD 102 receives an initial request from the video communications device 104 and rejects the initial request. A computer system 112 detects the initial request and acquires destination information in the initial request identifying the video communications device 104. The computer system 112 sends a simulated call to the ACD 102 requesting an agent for video communications. The ACD 102 selects an agent and notifies the computer system 112 which agent is selected. The computer system 112 then instructs an agent terminal 110 associated with the selected agent to establish video communications with the video communications device 104. The ACD 102 generates reports relating to the video communications.

Abstract: A non-contact method and apparatus for measuring and monitoring the surface of a fluid using fiber optics and interferometric detection to permit measurement mechanical characteristics' fluid surfaces. The apparatus employs an alternating electric field gradient for generating a capillary wave on the surface of the fluid. A fiber optic coupler and optical fiber directs a portion of a laser beam onto the surface of the fluid, another portion of the laser beam onto the photo sensor, and directs light reflected from the surface of the fluid onto the photo sensor. The output of the photo sensor is processed and coupled to a phase sensitive detector to permit measurement of phase shift between the drive signal creating the capillary wave and the detected signal. This phase shift information is then used to determine mechanical properties of the fluid surface such as surface tension, surface elasticity, and surface inhomogeneity.

Abstract: An integratable amplifier circuit with logarithmic electronic gain control capability. The circuit is suitable for audio applications and permit logarithmic control of volume with an external potentiometer without need to send the audio signal through control lines. In addition, the temperature coefficient of the gain is maintained at a very low level over a wide gain range.

Abstract: An out of lock detector for a sample and hold phase locked loop which provides very accurate resolution and can detect that the loop is converging while in the linear range of the phase detector. The circuit is composed of an AC coupled amplifier which receives signals from the phase locked loop sample and hold phase detector and provides a signal to a comparator network. The comparator network is comprised of two amplifiers whose outputs are in a wired AND configuration. The comparator amplifiers are referenced for the degree of lock required such that a voltage from the input amplifier which exceeds either the upper or lower reference voltage will produce a negative going pulse at the wired AND output circuit indicative of an out of lock condition.

Abstract: An automatic threshold squelch circuit, responsive to noise signals from the receiver demodulator, having automatic means for setting the squelch level. A noise detector is coupled to the demodulator and to a comparator and sample and hold circuit such that a predetermined portion of the detected noise signal level is stored in the sample and hold circuit when no signal is being received. The stored noise level is then compared to the detected noise signal from the noise detector and a mute signal is generated in response to the detected noise level exceeding the stored signal level.

Abstract: Digital method and apparatus for generation of a digital data stream with the bit transitions shaped to reduce splatter, and minimize droop and overshoot in a radio communications system utilizing digital coded squelch. A codeword digital data stream, in digitized form, is shaped so that the bit transitions have the form of a portion of a sine waveform and then is applied to a D/A converter. A simple filter follows the D/A converter to attenuate sampling noise.

Abstract: A wideband, modulation sensitivity compensated, voltage controlled oscillator which automatically and continuously compensates over a wide bandwidth for modulation sensitivity variations resulting from changes in the center frequency of oscillation. The invention includes a compensation network which continuously varies the coupling between the modulation circuit and the oscillator tank circuit in response to changes in the steering control signal applied to a steering network. Continuous modulation sensitivity compensation is thereby provided over a wide bandwidth.

Abstract: An improved sampling filter detector circuit for sampling input signals of different frequencies and providing a detect signal when the input frequency has a desired predetermined value. The circuit is suitable for use as a tone detector for continuous tone control squelch systems. The sampling filter detector substantially eliminates response to low order harmonics of the desired frequency and provides the ability to program the filter detector bandwidth by digital means without altering passive components thereby permitting reverse burst detection.

Abstract: A protection circuit for a transmitter amplifier which provides power leveling and controls transmitter output power as a function of the ratio of reflected power to forward power. The circuit senses forward power level and develops a first voltage which is compared with the reference voltage to provide a control voltage which controls the power developed by the transmitter amplifier. Reflected power is sensed and a second voltage is developed which is compared to a portion of the first voltage and causes a reduction in the reference voltage when the reflected power to forward power ratio exceeds a predetermined level.

Abstract: A communication system for receiving signals from both relatively low power level portable transmitters and relatively high power mobile transmitters wherein the receiving antenna utilizes selectively gain controlled vertically and horizontally polarized elements for enhancing signals from the portable transmitters and from longer range mobile transmitters while, at the same time, degrading signals from near field mobile transmitters.

Abstract: An analog integrated filter circuit includes a capacitance multiplier combined with a DC bias controlled current circuit designed to render the filter circuit insensitive to changes in the parameter values of the components caused by process variations or a temperature change therein. The capacitance multiplier circuit includes grounded or ungrounded capacitance multipliers in different combinations operatively coupled to the DC bias controlled current circuit so that the capacitance multiplier circuit can be used to construct a predictable low pass, bandpass or high pass filter circuit with frequency characteristics that do not vary over temperature.

Abstract: An improved frequency synthesizer utilizes a first order loop and sample-and-hold phase detector with optimized gain to obtain very fast frequency locking characteristics. In addition, synchronization of the programming of the loop divider and of the range shifting the voltage controlled oscillator is also utilized. An adaptive loop filter is provided to allow a first order loop to be used for lock acquisition and still maintain excellent noise performance after lock has been obtained.

Abstract: An active power supply ripple filter with low noise and low power dissipation characteristics, which tracks the voltage of the power source with low voltage drop and high current capability. The circuit consists of a control transistor connected between one terminal of a power source and one terminal of a load, a reference circuit which tracks the supply voltage, a low pass filter which filters the reference voltage and an amplifier for driving the control transistor in response to the filtered reference voltage and a feedback voltage from the load. The circuit minimizes the voltage drop across the control transistor as well as minimizing the capacitance values required for the filter capacitors.

Abstract: A high frequency divider suitable for use in a frequency synthesizer using a dual modulus prescaler and two counters to achieve high speed and low current drain. The input signal is alternately divided by one of the two moduli in the prescaler and then alternately divided by one of the two counters. Each of the two counters is reset while the other is counting thereby reducing circuit complexity and increasing circuit speed.

Abstract: An FET sample and hold switching circuit with low transient feedthru in a sample and hold phase detector. The FET OFF voltage is clamped to a value well below the supply voltage thus permitting reduction of stored charge on the interelectrode capacitances. This combined with FET capacitance compensation provides substantial reduction in feedthru and switching transients.

Abstract: A plurality of horizontally directive antenna sectors are arranged in a configuration to receive signals from remote transmitters over a given angle in the horizontal plane. A scanning system is operative in one of several modes to sequentially couple each sector to a receiver. In its first mode, each sector is sequentially scanned with the peak signal level therefrom being compared to a reference level. If the signal level on any sector exceeds the reference level the scanner activates to its second mode wherein scanning of all sectors continues for a predetermined interval after which the system advances to a selective scanning mode wherein scan is limited to that sector with the largest stored signal level relative to the reference level, and to those sectors adjacent said sector for a predetermined time interval. At the end of this interval, scanning is inhibited and the receiver is coupled to that sector which exhibited the strongest relative signal level during the scanning sequences.

Abstract: An improved frequency synthesizer suitable for use in mobile and portable radio applications using multiple dual modulus prescalers to achieve high frequency operation and low current drain. A first high speed prescaler of limited size is used in conjunction with a second prescaler to avoid the use of one large high speed prescaler to attain high frequency operation. Consequently, the frequency synthesizer can be constructed using only a minimum amount of high speed, high current drain logic thereby reducing costs and power consumption.

Abstract: Sense voltages representative of transmitter power and the temperature of the transmitter output stage are summed and fed to the input of a high gain amplifier. The output of the amplifier provides bias to the transmitter driver stage and, thus, controls the total transmitter developed power. The resulting overall feedback system provides precise transmitter power control and output stage thermal protection.