Abstract: An antenna system (20) provides low radio frequency interference (RFI) using an unbalanced antenna (21) comprised of three eighths wavelength whip antenna element (22) and associated counterpoise (23). Antenna counterpoise (23) may be formed by an EMI shielding conductor which is isolated at the frequency of operation of antenna system (20) from EMI shielding serving as host interface ground conductor (28) using resonant structure (25). Resonant structure (25) isolates antenna counterpoise (23) from host interface ground conductor (28) thereby improving antenna efficiency, and substantially eliminating RFI effects arising from use of antenna system (20).

Abstract: A technique is for receiving variable length messages in a selective call receiver (68) having a processor (110) coupled to a memory element (86). The selective call receiver (68) is configured to receive a signal transmitted in a standard protocol format comprising an address portion (14) and a message portion (16). First, second, third, and fourth configuration values are stored within the selective call receiver (68) from which determinations are made, respectively, whether the selective call receiver (68) is permitted to process sub-address information (22, 24) included within the message portion, whether said selective call receiver (68) is permitted to receive a particular sub-address included in the message portion, whether said selective call receive (68) is permitted to process a processor command (26) included in the message portion, and whether said selective call receiver (68) is permitted to receive and process a particular processor command included in the message portion.

Abstract: A method for conveying message origination information in a selective call receiver comprises selectively receiving a message (300) intended for the call receiver (140). The call receiver (140) identifies if the message received is flawed (302). In response to determining that the message is flawed, the selective call receiver (140) extracts origin information which has been appended to the message (306). The selective call receiver applies the origin information to a look-up table (308) in order to report more detailed information to the subscriber (310) indicating who the subscriber may contact to obtain the complete message.

Abstract: A communication system in which a multipart analog message (480) is generated by a controller (112) by including an analog part delimiter (440) between successive independent analog parts (420, 431, 432, 433). The multipart analog message (480) is positioned within a synchronous protocol, in which a digital code is included to identify the position of the multipart analog message (480). The synchronous protocol is transmitted by a radio transmitter (202) and received by a selective call receiver (122). The selective call receiver (122) digitally decodes the position of the multipart analog message (480) and begins recovery of the multipart analog message (480) at the position. The selective call receiver (122) recovers the part delimiters (440) and uses them to identify the independent analog parts (420, 431, 432, 433). One of the independent parts, which is a audible response, is selected by the user and used to generate a response.

Abstract: A portable electronic device (100) includes a housing cover (110) having a faceplate location (145), an electronic circuit (115), and a first faceplate (140). The location comprises a generic controls cutout (135) and a generic display cutout (130). The electronic circuit includes a specific set of controls (125) fitting within the generic controls cutout and a specific display (120) fitting within the generic display cutout. The first faceplate (140) is mounted in the faceplate and has a specific controls cutout (155) that is conformal to the set of specific controls (125) and a specific display lens (150) that is conformal to the specific display (120) and is one of a set of faceplates, wherein the first faceplate (140) is incompatible with another faceplate in the set of faceplates.

Abstract: A voltage splitter circuit (100) that generates a one-half supply voltage includes a first switched operational transconductance amplifier (switched OTA) (120), a first transistor switch (110) that is controlled by a first clock signal (108) to periodically switch a first supply voltage (135) to a non-inverting input (118) of the first switched OTA, a second switched OTA (115), a second transistor switch (105) that is controlled by an inverted second clock signal (104) to periodically switch a second supply voltage (130) to a non-inverting input (114) of the second switched OTA, a commutating capacitor (112) coupled between the non-inverting input of the first switched OTA and the non-inverting input of the second switched OTA, a first filter capacitor (145) coupled to an output (121) of the first switched OTA, a second filter capacitor (140) coupled to an output (116) of the second switched OTA, and a third switched OTA (125). The first and second clock signals are non-overlapping.

Abstract: In a system controller (102) a quantity of control channels is determined; a portion (344) of a code word (338) is set to identify the quantity of control channels; the code word (358) is transmitted in a predetermined portion (332) of each of a plurality of radio signals. In a multichannel radio (106) a receiver (610) is set to a first channel which includes one of the plurality of radio signals; the portion (344) of the code word (338) is decoded; one of the set of control channels is identified as a new home control channel, the home control channel is revised to the new home control channel, and the receiver (610) is set to the home control channel as revised. The one of the set of control channels is identified based on the quantity of control channels and a predetermined number in the multichannel radio (106).

Abstract: A display driver circuit (100) includes N scanning drivers (150) for driving a scanning set of display electrodes of a display panel (160) with a set of scanning signals (155), P information drivers (130) for driving an information set of display electrodes of the display panel (160) with a set of information signals (135), and a control section (120) having a first mode and a second mode. In the first mode the control section (120) controls the N scanning drivers (150) to generate N different scanning signals (155). In the second mode the control section controls the N scanning drivers (150) to generate a common scanning signal by S of the scanning drivers (156) and N-S different scanning signals by N-S drivers of the scanning drivers (157), wherein N, P and S are positive integers.

Abstract: A multiply accumulate circuit (600) includes a multiply accumulate reduction circuit (527) that generates P current accumulated operands during an iteration. P operand registers (582) are coupled to the multiply accumulate reduction circuit (527). A corresponding one of the P current accumulated operands is stored in each of the P operand registers (582) in place of one of the P partial accumulated operands in response to the iteration. Each of P feedback paths (593) couples one of P outputs of the P operand registers (582) to a corresponding one of P feedback inputs of the multiply accumulate reduction circuit (527). An adder (561) that is coupled to the P outputs through isolation circuits (570) generates an output (551) in N iterations that is a sum of N products, each being a product of one of a series of N multipliers and one of a series of N multiplicands.

Abstract: An acknowledge back portable selective call radio (10) for use in a selective call signal radio system (100) and method for determining selective call radio location (200-300), wherein the selective call radio (10) comprises a transceiver (14) for receiving selective call signals and transmitting acknowledge back signals, a processor (24) for monitoring and processing received selective call signals to monitor errors in the selective call signal, a global positioning system receiver (12) activated by the processor (24) when the number of errors exceeds a predetermined threshold, wherein the global positioning system receiver (12) receives satellite transmitted signals for triangulating the position of the selective call radio (10), and wherein the geographic location determined by the processor (24) is transmitted in the acknowledge back signal to the selective call signal transceiver station (110) where a transmission strategy is selected in accordance with the location of the selective call radio (10).

Abstract: A method and apparatus determine a response to a control value (316, 320) periodically transmitted by a communication system in at least one code word (306, 332) of a frame (302) of data of a communication protocol. The control value (316, 320) is for controlling a receive operation, such as the sleep interval for increasing battery life of a communication receiver (122) operating in the communication system. The receiver (122) accepts (404, 504) and stores (406, 506) earlier data from an earlier transmission of the frame (302) of data, and receives (408, 508) current data from a current transmission of the frame (302) of data.

Abstract: A two's complement digital to analog converter (300) is for converting a two's complement binary value to an analog output current, and includes a control circuit (310) which generates controlled value bits, a digital to analog current converter (DACC) (320), and an augmenter (330). The DACC (320) generates a DACC analog current which is a portion of the analog output current and which has an absolute value which is related to the binary value of the controlled value bits. The augmenter (330), which is coupled to a most significant bit of the two's complement binary value, generates a portion of the analog output current by modifying the absolute value of the DACC analog current by a least significant bit current increment when the most significant bit indicates a negative value of the two's complement binary value.

Abstract: An electronic circuit (100) for reducing electromagnetic interference includes a plurality of circuit elements (130, 140, 150) to which a set of bussed logic signals (343) generated by a set of first circuits (342) is distributed by a logic clock (120). The electronic circuit (100) further includes a plurality of cascaded busses (355, 135, 335) including a last cascaded bus (335) having a last enablement phase. Each of the plurality of cascaded busses (355, 135, 335) couples a set of amplified logic signals (355, 135, 335) from one of the plurality of circuit elements (358, 359, 336) to another one of the plurality of circuit elements (359, 336, 322). The set of amplified logic signals (355, 135, 335) of each of the plurality of cascaded busses is enabled during an enable period (351, 352, 330) which lasts beyond an end of the last enablement phase.

Abstract: A method is used by a detector (102) for extending the operating frequency range of a phase lock loop (100). The detector (102) detects a phase-frequency difference between a reference signal (109) and a generated signal (108) of the phase lock loop (100). The detector (102) includes a divider (202) for counting transitions of the generated signal (108) and a logic element (204) and counter (212) for detecting when the frequency of the generated signal (108) is such that the divider (202) operates outside its linear frequency range in relation to a predetermined transition of the reference signal (109). The detector (102) further includes a register (206) for recording a phase value of the divider (202) coincident with the predetermined transition, or a constant phase value (304, 306) when the frequency of the generated signal (108) is operating outside of the linear range of the divider (202).

Abstract: A system controller (102) generates and transmits a radio signal having long messages in data frames (370), and short and long messages in control frames (360). A set of selective call radio addresses is included at the beginning of a control frame (360), each selective call radio address including a subvector which indicates the starting position of a short message or a vector packet within the control frame (360). Vector packets indicate starting positions of long messages within the control frame (360), within other control frames (360), and within data frames (370). A selective call radio (106) receives the radio signal and recovers and processes the short and long messages, using the subvectors and vectors to identify the positions of the short and long messages.

Abstract: A distributed signaling system seven (SS7) call handling system (107) includes an SS7 message transport protocol level three (MTPL3) processing module (202), an SS7 message transport protocol lower level (MTPLL) processing module (258), and a local interconnection media (240). The SS7 MTPL3 processing module (202) includes an SS7 MTPL3 network layer (204) and an MTPL3 local network interface (218). The SS7 MTPLL processing module (258) includes an SS7 message transport protocol level one (MTPL1) physical layer (259), an SS7 message transport protocol level two (MTPL2) link layer (256), and an MTPLL local network interface (254). The local interconnection media (240), for example an Ethernet, couples the MTPL3 local network interface (218) to the MTPLL local network interface (254).