Abstract: A field emission device wherein two collecting electrodes are provided to selectively collect electrons that are emitted from an emitting electrode as induced by a gate electrode.

Abstract: A radio transceiver is disclosed for use in an SSB communication system having FM data capability. The dual-mode radio transceiver of the present invention includes a receiver capable of demodulating and deriving AFC from either (a) the voice channel having voice messages transmitted via single sideband amplitude modulation with a pilot carrier, or (b) the data channel having high speed data messages transmitted via narrowband frequency modulation in the same channel bandwidth. Furthermore, the dual-mode radio transceiver includes a transmitter capable of transmitting one of either of the above types of modulation on the appropriate channel, as determined by information received from the high speed data messages transmitted on the control channel.

Abstract: A method and apparatus for controlling the sound pressure levels of a substantially capacitive speaker. The controlling element is substantially capacitive and may be either fixed or variable.

Abstract: A bonding verification process which incorporates bonding test patterns and verifies the integrity of bonds by inspecting the bonding test patterns. For a bonding agent of solder, the bonding verification process verifies the integrity of solder connections by inspecting the bonding test patterns. The bonding test patterns can be implemented in a variety of configurations which verify several properties of the soldering process.

Abstract: A communication system that provides TDM and FDM communications between communication units. At least two control slots are provided in each TDM frame window to provide communication control information such as channel assignment information.

Abstract: A single-transistor frequency doubler uses an elliptical filter on the collector of the transistor to improve the bandwidth of the doubler. Bandwidths in excess of thirty five percent having relatively constant output power levels at frequencies over 200 MHz can be realized.

Abstract: A programming station for use in programming and servicing two-way radios. The station allows a user to read stored radio control and radio feature parameters as stored in either a radio or an archive file. The station allows the user to modify at least some of the radio feature parameters, and to access a remote central unit that allows modification of the remaining radio feature parameters. The changed parameters can then be merged as necessary and stored in the radio and/or an archive file.

Abstract: A programming station for aligning two-way radios. The station allows alignment of various radio control functions through use of a menu driven format. A relative value display is provided for many of the alterable values.

Abstract: A clock recovery device suitable for implementation in a DSP functions to correct a signal that includes the clock information for carrier frequency offsets, prior to extraction of the clock signal.

Abstract: An arrangement for a superconducting resonator suitable for use in electronic filters is disclosed, in which a resonator exhibits an increased amount of internal inductance without a lengthening of the resonator. By utilizing a relatively thin dielectric material, a significant amount of magnetic field is made to exist in a layer of the superconductors nearest to the dielectric. This magnetic field induces a non-negligible internal inductance within the layer. The net result of having this extra inductance is that the wave velocity is no longer a constant, independent of dielectric thickness. Thus the resonator can be constructed to be significantly shorter than the conventional wave velocity equation would imply. Hence, the present invention provides a reduction in the length as well as in the cross-sectional area of a resonator, which means that one or more of such resonators may then be advantageously utilized to achieve significantly reduced filter size.

Abstract: A method and apparatus for allowing a radio control console to failsoft to a predetermined channel assignment plan, without disrupting emergency calls then in progress, upon the failure of a CAD host computer link that would ordinarily provide control signals to the console. Channels are deassigned unless they are supporting an emergency call, and then reassigned to a default assignment. If the reassignment would cause a duplicate assignment, the duplicate assignment is first deassigned prior to making the new default assignment.

Abstract: An improved excitation vector generation and search technique (FIG. 1) is described for a code-excited linear prediction (CELP) speech coder (100) using a codebook memory of excitation code vectors. A set of M basis vectors v.sub.m (n) are used along with the excitation signal codewords (i) to generate the codebook of excitation vectors u.sub.i (n) according to a "vector sum" technique (120) of converting stored selector codewords into a plurality of interim data signals, multiplying the set of M basis vectors by the interim data signals, and summing the resultant vectors to produce the set of 2.sup.M codebook vectors. Only M basis vectors need to be stored in memory (114), as opposed to all 2.sup.M code vectors.

Abstract: Disclosed is a method and apparatus for time companding a digital voice signal wherein, single bits are periodically removed from the digital voice signal, which is then compressed thereby forming a contiguous area of removed bits. A synchronization signal is inserted into this area and the combined signal is transmitted. At the receiver, the synchronization signal is extracted and is used to synchronize the receiver. The digital voice signal is then expanded and the removed bits are predicted and replaced.

Abstract: A digital radio receiver is described. The digital receiver of the present invention contemplates a digital radio receiver which operates on a received analog signal which has been converted to a digital form after preselection at the output of the antenna. The digital receiver of the present invention comprises a preselector, a high-speed analog-to-digital (A/D) converter, a digitally implemented intermediate-frequency (IF) selectivity section having an output signal at substantially baseband frequencies, and digital signal processor (DSP) circuit performing demodulation and audio filtering. The radio architecture of the present invention is programmably adaptable to virtually every known modulation scheme and is particularly suitable for implementation on integrated circuits.

Abstract: A vehicular adaptor for a portable communications device, such as a cellular telephone, pager, or two-way radio, is disclosed which includes a connector that aligns itself to a mating connector on the communication device. The connector permits spatial alignment of electrical contacts in the connector with electrical contacts in the communications device. A corrugated spring mounting clamp and a locating nest on the connector permit the alignment of connections.

Abstract: A null initiated priority channel monitoring system provides enhanced nonpriority signal intelligibility and/or enhanced priority channel sensitivity during sample times. The priority channel or channels are monitored during nulls in the received nonpriority signal. The system can have a minimum time period between priority channel monitoring periods to avoid substantially continuous priority channel monitoring. The system can also have a maximum time period between priority channel monitoring or sampling periods to avoid missing any priority channel signal.