Abstract: An RF switch is used in the signal path to an amplifier, for example between a receiving antenna and an amplifier. The switch is used to alternately connect the amplifier between a normal signal source for the amplifier and a fixed load for calibration. The power difference between the two switch states at the output of the amplifier would then yield a calibrated measurement of a signal value, such as rise over thermal (RoT). The amount of time spent in the calibration position is maintained at a minimized level so as to reduce impact on the normal operation of the amplifier. The invention provides an ability to estimate traffic load in a repeater system based on RoT measurements of repeater reverse-link output power by determining a reverse link gain.

Abstract: A process and machine for estimating the location of a wireless terminal is disclosed. The illustrative embodiment of the present invention is based on the observation that the signal strength of a signal from a transmitter is different at some locations, and, therefore, the location of a wireless terminal can be estimated by comparing the signal strength it currently observes against a map or database that correlates locations to signal strengths. In accordance with a first example, if a particular radio station is known to be received well at a first location and poorly at a second location, and a given wireless terminal at an unknown location is receiving the radio station poorly, it is more likely that the wireless terminal is at the second location than it is at the first location.

Abstract: An RF system is capable of transmitting and receiving sensor data using an ultra low power narrowband RF signal. The system handles frequency drift and other problems inherent in such a system through a spectrogram statistical analysis, dynamic programming, and narrowband filtering.

Abstract: A coordinator's data transmission method, a device's data reception method, a coordinator using the coordinator's data transmission method and a device using the device's data reception method are provided. In a Zigbee system including at least one device and a coordinator for coordinating the device, in a case where a frame pending bit in a beacon frame is determined to be a value representing a direct transmission method, a beacon frame containing an address of a device to receive data and a data transmission time is generated and data is transmitted from the coordinator at the data transmission time. Data transmission time and power consumption can be reduced.

Abstract: Local communication system in wireless communication system includes a main wireless terminal negotiating with each of the peripheral wireless terminals during a time period for which a frame will be transmitted, generating a schedule map including negotiated time information and a transmission sequence of each of the peripheral wireless terminals, and transmitting the generated schedule map to all peripheral wireless terminals; and the peripheral wireless terminals storing the schedule map received from the main wireless terminal, and performing communication with the main wireless terminal according to the sequence determined in the schedule map for the negotiated time period.

Abstract: A circuit for producing a wake-up signal to control powering up an electronic system, has a frequency selective radio frequency (RF) amplifier circuit that amplifies signals within a predetermined frequency range and produces an amplified RF output signal. An RF detector detects the presence of amplified RF output at the output of the amplifier circuit and produces a signal W indicative of the instantaneous presence of the RF output signal. A threshold detector circuit determines if the amplified output signal has reached a predetermined threshold and produces an output signal T. A clock generates a clock signal having clock period in response to the threshold detector output signal T. A data decoder logic circuit turns off the clock in the absence of an RF output signal for a prescribed time period and decodes the RF detector output signal W into a stream of output signals.

Abstract: A communication unit for a radio communication system comprises a receiver for receiving data over an air interface. The receiver can operate in a first diversity mode and a second diversity mode. The first diversity mode may specifically correspond to no receive diversity being employed and the second diversity mode may correspond to signals from two or more fully or partially de-correlated antennas being combined. The communication unit comprises a data unit which determines a first data characteristic for a section of data to be received over the air interface. A switching unit is arranged to switch between the first diversity mode and the second diversity mode in response to the first data characteristic. The invention may allow improved performance and e.g. reduced power consumption by allowing an improved adaptation of diversity operation. In particular, an improved trade-off between power consumption and performance may be achieved in many embodiments.

Abstract: An integrated circuit. The integrated circuit is usable in a transceiver module. The integrated circuit includes an input port that is configured to receive a data stream. A clock port on the integrated circuit is configured to receive a reference clock diplexed with another signal or voltage used by the integrated circuit. An eye opening circuit is connected to the input port and clock. The eye opening circuit is configured to retime the data stream received at the input port. An output port is connected to the eye opening circuits The output port is configured to transmit a retimed signal from the eye opening circuit to a device external to the integrated circuit. A bypass circuit is connected to the input port and the output port. The bypass circuit may selectively bypass the eye opening circuit.

Abstract: A radio receiver includes a power control module for selectively powering down and powering up radio receiver elements in between known communication periods according to one aspect of the present invention. According to a second aspect of the invention, the radio receiver operates in a low power mode of operation and periodically “sniffs” to determine whether an access point has messages or communication signals to transmit to it.

Abstract: A system and method that utilizes a dedicated transmission queue to enable expedited transmission of data messages to adaptive “nearest neighbor” nodes within a cluster. Packet descriptors are pre-fetched by the communications adapter hardware during the transmission of the preceding data element and setup for the next transmission is performed in parallel with the transmission of the preceding data element. Data elements of a fixed length that is equal to the cache line size of the communication hardware can optionally be used to provide optimized transfer between computer memory and communications hardware. The data receiving processing can also be optimized to recognize and handle cache line size data elements.

Abstract: A method for determining a time of a beginning of a measurement time interval for carrying out a radio measurement, the method including receiving a message via a radio communication channel and determining the time of the beginning of the measurement time interval based on a time of the transmission of the message.

Abstract: An electronic apparatus with power saving functionality is provided. The electronic apparatus includes a signal processing device configured for performing a predetermined signal processing operation; a wireless communication device coupled to the signal processing circuit for communicating with an external wireless communication device through a wireless connection; and a controller coupled to the signal processing device and the wireless communication device for switching the signal processing device between a first mode and a second mode according to a connection status of the wireless connection. The signal processing device operating in the second mode has less power consumption than the signal processing device operating in the first mode.

Abstract: A bias filtering module with at least two capacitive levels satisfies both a settle time requirement and a filtering requirement using a voltage dependent filter module whose capacitance is a function of a voltage potential on the filtering circuitry output terminal. The final capacitance level is approximately three times larger than the initial capacitance level. MOS capacitors having a voltage dependent charge capacity within the bias filtering module are coupled between a plurality of bias lines and circuit common. In an alternate embodiment, a selectable first group of capacitors are switched into connection within the bias filtering module as a second group of capacitors approximately reach a fully charged state within a specified settle time to provide improved filtering.

Abstract: A direct conversion receiver includes a mixer for converting an RF signal into a baseband signal, a dynamic DC offset compensator for compensating for a dynamic DC offset caused by the effect of second order nonlinear distortion of the mixer on an interfering wave that enters the input terminals of the mixer, and a static DC offset compensator for compensating for a static DC offset caused by self-mixing of a local signal and a leakage component of the local signal that appears at the input terminals of the mixer. The static DC offset compensation starts at a time t1 after a DC offset compensation operation has started. The static DC offset compensation is finished at the next time t2, and then the dynamic DC offset compensation starts. The dynamic DC offset compensation is finished at the next time t3. With this configuration, only a change in DC offset due to the dynamic DC offset is compensated after compensating for the static DC offset component.

Abstract: A receiver has an offset application circuit for applying a known offset to an input signal, and a decision circuit for comparing the offset-applied input signal with a reference voltage. The level of the input signal is determined based on the known offset and on the result output from the decision circuit. With this configuration, a large common mode voltage can be eliminated in a circuit used for signal transmission.

Abstract: There is provided a method for use by a user equipment of a Universal Mobile Telecommunication System (UMTS) that supports HSDPA, and a network node in communication with such a user equipment. In an embodiment the method includes, identifying a transmission gap in a downlink transmission from a base station on a first channel. Next the transmission gap is mapped onto a first channel to define a first suspension period encompassing the subframes of the first channel that overlap the transmission gap. The method further includes expanding the first suspension period to define a further period encompassing the subframes of at least one further channel that overlap the first suspension period, and defining a reception suspension period encompassing the further period, and subframes associated with the subframes falling within the further period.

Abstract: Provided is a mobile station that a user is able to use without inconvenience, and that is able to realize power consumption saving. The mobile station: records a speech-communication history including information identifying a time at which speech communication occurred; decides a cycle changing time and a cycle-after-change based on the speech-communication history, the cycle changing time being a time at which a paging channel monitoring cycle used by a base station in message transmission is to be changed, and the cycle-after-change being a cycle at which the paging channel is to be monitored after the change; notifies the base station of a slot cycle index indicating the decided cycle-after-change when the decided cycle changing time has come; and starts monitoring the paging channel at the decided cycle-after-change when the decided cycle changing time has come.

Abstract: A radio wave receiver for receiving radio waves having a predetermined frequency, the receiver comprises an antenna, an variable capacitor connected to the antenna, a memory, and a controller which determines an optimum capacitance of the variable capacitor with which the radio wave receiver is in a predetermined reception state and writes optimum capacitance data into the memory and, controls the variable capacitor based on the optimum capacitance data.

Abstract: A radio receiver comprises an LNA which amplifies An RF signal, a quadrature demodulator which directly demodulates the amplified RF signal into a B/B signal, using a LO signal, a VGA which amplifies the B/B signal, a DC offset canceller which executes feedback control on the amplified B/B signal, and a gain controller which controls at least the gain of the LNA, the gain controller including a signal intensity detector which detects the intensity of the amplified B/B signal, a gain selector which selects a desired one of preset gains on the basis of the detected intensity, a timing controller which controls timing of switching to the selected desired gain, and a gain control signal generator which changes, in accordance with the controlled timing, the interval at which an LNA gain control signal is generated.

Abstract: A direct conversion receiver includes a local oscillator for generating a sinusoid, a mixer for receiving an incoming signal and for mixing the incoming signal with the sinusoid, an analog-to-digital converter for converting the mixed analog signal into a digital signal, and a digital signal processor for outputting the digital signal so that an I-channel signal and a Q-channel signal are output separately and for transmitting to the local oscillator a phase control signal that determines the phase of a sinusoid to be generated by the local oscillator. The direct conversion receiver may further include a low noise amplifier for amplifying the incoming while preventing noise included in the input signal from being amplified, a baseband amplifier for amplifying the mixed analog signal in a baseband, and a baseband low pass filter for removing low frequency noise from a signal amplified by the baseband amplifier.

Abstract: An electrical circuit detects a “squelch,” or “out-of-band,” state of a differential signal pair having a positive (“p”) signal line and a negative (“n”) signal line. In one embodiment of the invention, a first and a second comparator each have positive inputs driven by the positive and negative signal lines, respectively. The negative inputs of the comparators are driven by the outputs of separate digital-to-analog converters (DACs) which are set to a lower squelch threshold voltage. The outputs of the comparators then drive the inputs of a logical AND gate, the output of which indicates the current squelch state of the differential signal pair.

Abstract: A mobile telephone apparatus is disclosed in which a solar power source is used to supplement battery power. A solar cell array is positioned on the surface of the telephone and supplies electric current to the telephone. A preferred embodiment of the present invention is equipped with speech recognition software that allows the user to issue commands (such as dialling the telephone) verbally to the telephone. In addition, this speech recognition may be used to operate an integrated AM/FM broadcast radio to allow the telephone to double as a radio. In an alternative embodiment, the solar mobile telephone is integrated into a headset to allow for convenient hands-free operation.

Abstract: A tone generator in a transceiver of a communications device may generate an arbitrary signal using two shift registers to generate the time intervals. During each time interval, a different capacitor is switched onto the node to change the voltage potential on that node. The amplitude of the waveform during each time interval is changed to provide the desired tone.

Abstract: A data transmission system for short but frequent data pulses comprises a transmitter (10) and a receiver (12). The transmitter comprises a pseudo-random signal generator (16) which governs the time delay between successive timing points and a local oscillator (15) which controls the time of data transmission, and the receiver comprises a corresponding pseudo-random signal generator (22) and local oscillator (24). Power is applied to the receiver substantially only corresponding in time to the timing of the data bursts. Multiple collisions between adjacent systems operating on the same wavelength are avoided and the receiver is controlled to consume power only around the timing of the data bursts.

Abstract: A content distribution system may distribute content to a plurality of receivers on demand. When it is determined that two different receivers are receiving the same program but one receiver requested the information prior to the other, bandwidth may be conserved by increasing the rate of data flow to one user and decreasing the rate of data flow to another user, in one embodiment, until such time as both users are receiving the same portion of the program at the same time. In such case, the program may be simultaneously distributed to two users on the same channel, conserving bandwidth.

Abstract: A clock radio includes a clock a user interface that is dynamically configurable from a remote computer. Once configured, the user interface allows a user to select radio programs that are accessible by the remote computer. When a user selects a radio program via the interface, a signal indicating the selected radio program is transmitted from the clock radio to the remote computer. The remote computer then accesses the selected radio program and transmits the selected radio program to speaker(s) for broadcast.

Abstract: A remote controlled system employs a computer-based remote control facilitator to facilitate remote control of a controlled device from a non-dedicated remote controller. The computer facilitator is coupled to the remote controller and controlled device via a wireless or wire-based network. The computer facilitator runs an application that corresponds to the controlled device. Neither the remote controller nor the controlled device need have any awareness of the other, or any knowledge as to how to communicate with one another. The computer tells the remote controller what options to present to a user and translates the selection entered by the user into a command that is sent to the controlled device.

Abstract: A variable frequency oscillator comprising: an oscillatory circuit for generating a periodic output dependent on the capacitance between a first node and a second node of the circuit, and having a capacitative element connected between the first node and the second node; the capacitative element comprising: a variable capacitance unit, the capacitance of which is variable for varying the frequency of the output and a plurality of finite capacitances each being selectively connectable in parallel with the variable capacitance unit between the first node and the second node to trim the frequency of the output.

Abstract: An amplifier powered by a selectively engageable voltage source and a method for operating the amplifier. The amplifier includes first and second electrodes for receiving an input signal to be amplified. The first and second electrodes are adapted to be respectively connected to coupling capacitors. The amplifier also includes a differential amplifier having inputs respectively connected to the first and second electrodes, and having an output. The amplifier additionally includes selectively engageable resistances coupled between the voltage source and respective inputs of the differential amplifier and defining, with the coupling capacitors, the high pass characteristics of the circuit. The amplifier further includes second selectively engageable resistances coupled between the voltage source and respective inputs of the differential amplifier.

Abstract: The present invention relates to a method for use in controlling the emission power of a transceiver which is in communication with another transceiver via a communication system, said method including the steps of measuring the amplitude or the power of the signal received by said transceiver and of evaluating a power control command which is then used to command the emission power of said transceiver according to said control command signal. According to the invention, the method includes the steps of evaluating the fast fading duration of the received signal on basis of said amplitude or power measurement and of deducing the power control command from said fast fading duration.

Abstract: A tuneable radio and method for automatically adjusting the seek sensitivity alignment for seek operations. The radio has a radio receiver for receiving broadcast radio wave signals, and a tuner adjustable for selecting from a plurality of radio wave signal channels. A detector detects signal strength of the received radio wave signals, and a seek input allows a user to initiate a seek operation to select a signal channel having a signal strength exceeding a seek sensitivity threshold. A controller calculates an average signal value and adjusts the seek sensitivity threshold based on the average value. The controller adjusts the seek sensitivity when it is determined that the radio has travelled beyond a minimum distance.

Abstract: A scheduling apparatus and method of an intelligent mobile communication terminal are provided. The scheduling apparatus of the mobile communication terminal may include a Real Time Clock (RTC) for providing a real time when an action of a mobile terminal is proceeding; a memory for storing information of a user mode and a CPU for standardizing a time value, a user mode information and an action of the terminal transferred from the RTC to store in the memory. The CPU may further transfer the standardized data stored in the memory to a co-processor through an interrupt and the CPU may control peripheral devices upon receiving an output value from the co-processor. The co-processor may also be provided for receiving data from the CPU through an interrupt communication and calculating an output value according to an MOBP learning algorithm. An LCD may output a message according to the output value under the control of the CPU.

Abstract: A method of processing a pulse response with an adaptive threshold and corresponding receiver. According to the method, an adaptive threshold is calculated that is a function of a maximum reached by the pulse response, noise, and a coefficient adjustable between 0 and 1. The processing only comes into operation for signals that exceed this threshold. Such a method may find application notably to digital radio-communications with spread spectrum.

Abstract: The invention provides a personal data assistant terminal with radio having data transmission and reception functions by a radio wave wherein the applied power supply mode of a CPU can be changed over to a power supply mode required by a peripheral circuit to the CPU. When a power supply mode change-over signal representing a power supply mode which is to be entered subsequently and a power supply mode defining signal for defining the power supply mode represented by the power supply mode change-over signal are inputted from the outside to a power supply control section of a CPU, a CPU core in the CPU changes over the applied power supply mode of the CPU to the power supply mode represented by the power supply mode change-over signal.

Abstract: A receiving apparatus comprises a receiver receiving signals via multiple propagation paths having different propagation delays and converting the signals to digital samples for processing. A channel estimator is operatively coupled to the receiver for correlating periodically selected groups of the digital samples corresponding to known symbols and periodically producing numerical estimates related to amplitudes and phases of the delayed propagation paths. A filter system filters the numerical estimates using filters periodically adapted to center frequencies of variations of the numerical estimates. A data decoder is operatively coupled to the receiver and the filter system for decoding data using the filtered estimates and the digital data.

Abstract: The invention provides a personal data assistant terminal with radio having data transmission and reception functions by a radio wave wherein the applied power supply mode of a CPU can be changed over to a power supply mode required by a peripheral circuit to the CPU. When a power supply mode change-over signal representing a power supply mode which is to be entered subsequently and a power supply mode defining signal for defining the power supply mode represented by the power supply mode change-over signal are inputted from the outside to a power supply control section of a CPU, a CPU core in the CPU changes over the applied power supply mode of the CPU to the power supply mode represented by the power supply mode change-over signal.

Abstract: This invention is to provide a receiving apparatus with diversity, including a first reception unit for receiving a radio signal, a second reception unit for receiving a radio signal, a selection unit for selecting one of the first and second reception unit, a detection unit for detecting that a electric field intensity of the radio signal received by the first or second reception unit selected by the selection unit lowers to a predetermined electric field intensity or less, and a switching unit for causing the selection unit to alternately select the first and second reception unit in a predetermined time when the detection unit detects that the electric field intensity of the radio signal lowers to the predetermined electric field intensity or less.

Abstract: There are a receiving unit for receiving a TDMA signal which is FSK (FM) modulated by a signal containing known information, and a demodulating unit 103 for demodulating received data. The demodulating unit 103 outputs a demodulated signal in a direct connection to a C-coupling. A C-coupling demodulation signal is inputted to a synchronization detecting unit 105, and a directly connected demodulation signal is inputted to an AFCBU 106. After a power supply is turned on, the C-coupling demodulation signal is inputted to the synchronization detecting unit 105. The demodulation signal whose synchronization state is being detected is inputted to the AFC unit 106 in a parallel condition and in a direct connection condition. After the synchronization signal is detected, a frequency offset correction is applied to thereby change a frequency offset of the frequency-converted signal by a carrier wave frequency converting section 10.

Abstract: A system and method for management of an interface for communications systems and devices using a recognizer having a limited time duration recognition window, based on mapping available time to a spatial representation. The system has particular application to management of a speech interface for a speech recognizer with a limited time duration recognition window. When the speech recognizer is on and a recognition window is opened, a timing signal is sent to the device and processed to provide spatial representation of the time remaining, e.g. in the form of an animation on a graphical user interface, or a recognizable pattern of stimulation using a haptic interface. As the recognition window advances and closes, the animation or pattern also changes and closes, e.g. diminishes in size, to provide the user with spatial information indicative of the time left in the recognition window.

Abstract: An apparatus designed to damp external noises, allowing the user to sleep in noisy environments. More particularly, it relates to a pair of hearing-protecting ear covers that insulate the user's ears from external noises, ear covers that incorporate a headphone stereo for transmission of a time, smoke, fire and/or security alarms. The headphone stereo can also transmit music, peaceful sounds, or noise reducing frequencies. The sound producing circuitry is connect in parallel to the alarm system to allow alarm detection even when the user is listening to music or other sounds.

Abstract: A method and apparatus of providing active entertainment for persons waiting for service in which such persons are provided with an electronic pager assembly for notifying when service is available includes an electronically controllable pager assembly having a controllable screen display which is programmed with information likely to be desirable to a person holding the pager. A set of instructions enabling a person to access the information programmed in the pager assembly is printed on the assembly. The pager notification capability functions regardless of whether the information display is or is not active.

Abstract: A intelligent power management apparatus for use with a matched-filter. A multiplexer multiplexes shifted-in-phase chips and shifted-quadrature-phase chips from an in-phase-shift register and a quadrature-phase-shift register, respectively, to generate multiplexed chips. The multiplexed chips include alternating sets of shifted-in-phase chips and shifted-quadrature-phase chips. A controller generates a POWERDOWN signal when the multiplexed chips from a received-spread-spectrum signal are unlikely to have a particular-chip sequence. The controller generates an ACTIVATION signal when the multiplexed chips are likely to have the particular-chip sequence present. An adder tree generates a CORRELATION signal when the multiplexed chips have the particular-chip sequence and match or correlate with the settings of the adder tree.

Abstract: A intelligent power management apparatus for use with a matched-filter. A multiplexer multiplexes shifted-in-phase chips and shifted-quadrature-phase chips from an in-phase-shift register and a quadrature-phase-shift register, respectively, to generate multiplexed chips. The multiplexed chips include alternating sets of shifted-in-phase chips and shifted-quadrature-phase chips. A controller generates a POWERDOWN signal when the multiplexed chips from a received-spread-spectrum signal do not have a particular-chip sequence. The controller generates an ACTIVATION signal when the multiplexed chips have the particular-chip sequence present. An adder tree generates a CORRELATION signal when the multiplexed chips have the particular-chip sequence and match or correlate with the settings of the adder tree. A number of AND gates inhibit the multiplexed chips from passing to the adder tree when the POWERDOWN signal is present, and pass the multiplexed chips to the adder tree when the ACTIVATION signal is present.

Abstract: A system for locating an object. The system includes an electronic device, a wireless transmitter for outputting a transmitted signal, and a receiver wherein one of the receiver or the transmitter is mounted within the electronic device and the other is positioned remote therefrom. The receiver comprises a wake up timer circuit for periodically generating a wake up signal, a wireless signal receiver being activated by the receipt of the wake up signal from the wake up timer circuit for generating a detect signal when the wireless signal receiver circuit receives the transmitted signal from the transmitter; and an audible signal generator circuit for generating an audible signal upon receipt of the detect signal from the wireless signal receiver circuit. The wake up timer circuit and the wireless signal receiver circuit are disabled when the audible signal generator circuit generates the audible signal.

Abstract: A system for locating an object, particularly a remote control, has a transmitter and a receiver, wherein the receiver has circuitry implementing power saving features. The receiver includes circuitry for turning off portions of the circuitry not essential for performing the current task. The receiver additionally only activates the wireless signal receiver portion of the circuitry periodically for short periods of time. The time of activation represents a small fraction of the operational time if the wireless signal receiver portion were to remain activated continuously.

Abstract: A radio transmit-receive unit can perform the communication processing stably without being affected by high frequency noise with the system activation of a computer unit, whereby if a communication processing request from the radio transmit-receive unit occurs, the computer unit sets the system state of a sub-CPU being activated to a rest state, a counter starts clocking the signal receive time of the radio transmit-receive unit when the system state of the sub-CPU is in a rest state, and a latch circuit holds electric field strength information of carrier received by the radio transmit-receive unit upon the termination of clocking by the counter. And the computer unit switches the system state of the sub-CPU being at rest to an active state, based on the end state of clocking by the counter, to restart the activation of the computer unit.

Abstract: A GPS receiver having a normal mode to receive GPS satellite signals and to provide location information, and a low power standby mode. A microprocessor system in the GPS receiver causes the GPS receiver to alternate between the normal mode and the low power standby mode in order to reduce the average power consumption in the GPS receiver. In the normal mode a GPS antenna receives GPS satellite signals, the GPS frequency downconverter converts the frequency of the GPS satellite signals to an intermediate frequency, a digital signal processing system processes the intermediate frequency to provide GPS satellite signal correlation information. The microprocessor system processes the correlation information and provides location information to a user. In the standby mode, the operating power is inhibited in the GPS antenna and the GPS frequency downconverter, the system clock is inhibited in the digital processing system, and the microprocessor clock is inhibited in the microprocessor system.

Abstract: A radio receiver has a radio tuner having a radio frequency input and an audio output, and an audio signal amplifying system having an audio input and an electroacoustical transducing output. A volume controller is coupled to the radio tuner and the audio amplifying system. A microprocessor is coupled to the tuner, volume controller, a visible display and an array of controls.

Abstract: A selective call receiving apparatus with a display for receiving and displaying its own selective call number and message information attached to it, displaying time while waiting for a call to be received and displaying the message information added with a receiving time. The selective call receiving apparatus with a display comprises a comparing unit for comparing the message information with preset individual message information and for producing a coincidence signal when both items of information have coincided, a clock time setting unit which operates based on the coincidence signal from the comparing unit, and a display unit for displaying an output from the clock time setting unit.

Abstract: A radio transceiver having digitally-corrected temperature-compensated crystal oscillators (DTCXOs) including digital frequency temperature compensation circuits that are temporarily suspended from being updated, such that temperature compensation updates that can generate noise during periods of reception and transmission that could interfere with the audio channel and/or signal synchronization will be postponed. Temperature is converted to a digital signal that is then used to address a PROM. The PROM outputs a correction word appropriate for the temperature reading and inputs this to a latch. A timing control loads the latch after data has settled. The latched correction word is connected to a bank of switches and capacitors that trim the frequency of the crystal oscillator. During radio transmission and/or reception, the latch will be suspended from loading any new correction words. The last valid correction word, however, will remain.