Abstract: A mobile radio is disclosed which includes an integrated circuit audio processor which operates under the control of at least one microprocessor. The audio processor provides basic transmit/receive audio filters, tone signaling filters, squelch filters, an RF power level control circuit, a DC voltage measuring circuit, a volume level adjusting circuit, and a transmit level adjusting circuit. In the audio processor, audio bandwidth, tone filter response, squelch filter response and other operating characteristics are adjusted by an incoming data bit stream from the controlling microprocessor. In addition, in response to data received from a microprocessor, the audio processor is controlled, for example, to have its receive audio path closed and its transmit audio path opened to switch from the receive to transmit mode.

Abstract: The operating frequency of a radio transceiver and at least one further variable operating parameter of the radio transceiver are controlled in accordance with pre-stored information. Transmit operating radio frequency information is stored in a memory together with associated optimum modulation deviation level information (e.g., so as to maintain a predetermined modulation level at each operating frequency). Receive operating radio frequency information is similarly stored in the memory along with information indicating whether microprocessor clock oscillator frequency is to be shifted (e.g., so as to avoid spurious interfering harmonics emanating from the clock). When operating in the transmit mode, pre-stored modulation gain level information associated with the selected transmit frequency controls the gain of the modulator circuits to compensate for expected changes in modulator circuit gain with change in transmit radio frequency.

Abstract: A FM mobile radio is disclosed which is capable of future functional expansion due to a unique microprocessor hardware/software control system. The radio includes a control microprocessor which is capable of performing all the basic radio control functions. In addition, options are added via a plug-on board that includes an option microprocessor which interfaces with the control microprocessor over a data bus and with the radio's audio circuits through audio processing circuitry. The software of the system allows control to be passed to the option board. The radio operates in a standard control mode and an option control mode. In the standard mode, in which no option board is present, the control processor performs all basic radio control functions. In the option mode, where the option control microprocessor is present, the main control processor typically receives commands from the option board.

Abstract: The operating frequency of a radio transceiver and at least one further variable operating parameter of the radio transceiver are controlled in accordance with pre-stored information. Transmit operating radio frequency information is stored in a memory together with associated optimum modulation deviation level information (e.g., so as to maintain a predetermined modulation level at each operating frequency). Receive operating radio frequency information is similarly stored in the memory along with information indicating whether microprocessor clock oscillator frequency is to be shifted (e.g., so as to avoid spurious interfering harmonics emanating from the clock). When operating in the transmit mode, pre-stored modulation gain level information associated with the selected transmit frequency controls the gain of the modulator circuits to compensate for expected changes in modulator circuit gain with change in transmit radio frequency.

Abstract: A computer-controlled portable radio communications device has RF and audio circuits controlled by a programmed computer in accordance with a predetermined modus operandi and includes an externally accessible multi-point electrical connector having input/output connections which communicate with the programmed computer. The computer is programmed to monitor the electrical impedance externally connected to at least one contact point of the connector and to alter the modus operandi of the portable radio system in response to such monitoring. In the exemplary embodiment, each of plural different types of accessory devices include a predetermined electrical impedance uniquely corresponding to that particular accessory device. The circuits are arranged so that no damage can be inflicted by accidental external electrical short circuits which the user may accidentally cause.

Abstract: An improved arrangement for powering a two-way portable radio or the like comprises rechargable battery cells and sets of power input and output contacts interconnected to each other and the battery cells in such a way that the output contacts may be electrically connected to the battery cells for powering the radio, or to the input contacts for receiving power directly from a battery charger for dead battery operation while simultaneously recharging the battery cells, all battery pack contacts being electrically isolated from the battery cells in the latter mode of operation.

Abstract: An externally connectable control unit for a portable radio includes an array of contacts matching a similar array of contacts on a portable radio. At lest one control switch is electrically connected with such connector contacts and disposed internally of a switch housing structure. The internal switch is located in association with a recess formed in the housing and a removable plug is friction-fitted within the recess so as to establish a first electrical condition of the control switch--but which is also capable of being manually pulled out of the recess to establish a second electrical condition of the control switch. The meaning to be associated with the switch is determined by a programming device in the control unit which interfaces with the portable radio circuits and is utilized to perform predetermined radio functions. One or more additional switches may also be located on the switch housing (e.g.

Abstract: A vehicular battery charger connects with a battery powered portable radio via plural electrical contacts including a so-called "universal device connector" (UDC). A battery contact interface is also provided. Battery charging current as well as auxiliary radio operating power is made available at the contact interfaces. In addition, the charger is capable of remotely controlling the modus operandi of the portable radio device so as, if desired, to convert the portable radio device to provide vehicular mobile or fixed base radio operations during the battery charging process. If such modified radio operation is desired, the battery charger detects current being drawn from the external radio power supply source (for supplying power to the radio operating circuits independently of the portable radio battery which is then being charged) and automatically reconfigures the portable radio device as needed to effect the vehicular mobile or fixed base operation.

Abstract: A repeating binary word detecting circuit produces a plurality of phase shifted samples of the logic of each binary bit forming the word. The plurality of samples are respectively compared with a stored sequence of bits forming the binary word to be detected. These comparisons are made for every possible beginning sequence of samples or stored bits between the time of two samples. An indication is given if a selected number of comparisons agree. A threshold circuit produces a decode output in response to a selected number of indications based on at least two phase shifted samples.

Abstract: The prior art tone detector shown in U.S. Pat. No. 3,962,645 provides a repetitive sequence of vector signals at a predetermined or selected rate determined by the desired tone frequency to be detected. Each vector in the sequence has a different phase or angular direction. One vector in each sequence is selected at a time corresponding to a selected (usually zero) point in each cycle of received tone frequency. If the sum of a number of selected vectors exceeds a threshold, an indication of the desired tone is provided.In some tone detectors a phase shift in the tone can indicate a selected condition. Such a phase shift is detected by counting the number of vectors which are produced after the phase shift, whose magnitude added to the magnitude of the vectors produced before the phase shift exceeds a threshold, and whose sign differs from the sign of the vectors produced before the phase shift. When the count reaches a predetermined number, a phase shift indication is provided.