Abstract: A radio frequency identification (RFID) communication system and the search method thereof are disclosed, which apply search instructions and reads instructions to communicate between a read and a plurality of transponders. Each transponder generates a random number for comparison with received search instructions. When the random number meets with the number of received search instructions, a response request is sent by a corresponding transponder such that the reader can read the content of the corresponding transponder.

Abstract: The present invention relates to a method of controlling load in a mobile communication system in a system in which mobile stations include means for utilizing discontinuous transmission. In order to utilize the traffic capacity of the system more efficiently than before, at least one mobile station is equipped with regulation means for regulating its parameters related to discontinuous transmission, and a control signal is transmitted via a radio path to the at least one mobile station for regulating its parameters related to discontinuous transmission in such a manner that the mobile station transmits telecommunication signals to the other parts of the system more seldom or more often.

Abstract: In a method for locating a position of a terminal with use of weak signals, a combined weight to be used to separate a path from others through correlation calculation is obtained from a plurality of delay profiles measured in course of time. The obtained weight is used to combine the delay profiles and a path detection is carried out on the combined delay profiles.

Abstract: In an impedance matching circuit for a multi-band radio frequency device, a first radio frequency signal in a first sub-band of a multi-band radio frequency signal is selectively outputted. Further, a second radio frequency signal in a second sub-band of the multi-band radio frequency signal is selectively outputted. Selective outputting is done through partly shared and partly non-shared reactive elements, without the need to switch reactive elements.

Abstract: Apparatus, and an associated method, for facilitating frequency offset estimation between communication stations operable in a communication system. A likelihood polynomial is calculated and provided to a filter. The filter forms a filtered representation of the likelihood polynomial, and the filtered representations are down-sampled by a decimator. A sampled, filtered representation of the likelihood polynomial is thereby obtained. The filtered, sampled representation is applied to a root calculator that calculates the roots of the polynomial, thereafter, to be used to compensate for the frequency offset.

Abstract: The present invention pertains to an apparatus and method for automatically disabling cell phone ringing and/or cell phone beeping. An RF transmitter is used to transmit an RF non-audible mode or control signal. Upon receiving the non-audible mode or control signal, the cell phone and/or beeper automatically disables its audible alarm. Users are notified of incoming calls and/or pages by means of blinking lights or vibration. When the user no longer receives the non-audible mode or control signal or upon the elapse of a fixed, pre-determined amount of time, the cell phone and/or beeper automatically reverts back to its normal mode of operation whereby incoming calls and pages are indicated by cell phone ringing and pager beeping.

Abstract: A method of estimating a downlink channel between a base station and a mobile terminal in a mobile telecommunication system. In the method the base station estimates the uplink channel between the mobile terminal and the base station, deduces, from the variations in the uplink channel, variations in the down link channels, makes an initial estimation of the down link channel at a first instant, and estimates at a second instant the downlink channel from the initial estimation at the first instant and variations in the downlink channel between the first and second instants.

Abstract: A transmission power control method for a CDMA communication system which performs communication between a basestation and a plurality of mobile stations; comprising the steps of: transmitting uplink power from the plurality of the mobile stations to the basestation; measuring and receiving the uplink power transmitted from each of the plurality of mobile stations with different signal-to-interference (SIR) requirement thresholds at the basestation; taking a algorithm to converge the transmitted uplink power from each of the plurality of mobile stations; and calculating the uplink power transmitted from each of the plurality of mobile stations by a power convergence factor. The transmission power control method only needs the local measurements at the basestation and can meet different SIR requirements of mobile stations based on fair principle. Additionally, the transmission power control method of the present invention can not only converge fast, but also keep the transmitted power in a reasonable range.

Abstract: A communication system includes first and second terminals which are able to communicate control messages to each other. One of the terminals can reconfigure itself by a process of service negotiations with the other terminal where the capabilities of the reconfigurable terminal are provided to the other terminal. Each of the terminals has a transceiver, a memory for storing software functions, and a processor for controlling the operation of the terminal in accordance with stored software functions. At least one of the software functions is alterable in response to the receipt of a control message containing the new software function plus interface software required by the processor in building a new function into an actual implementation on the terminal. The communication system may be a cordless and/or cellular telephone system where messages are sent over-the-air, or a corded system where messages are relayed by landline.

Abstract: Method of obtaining a transmission gain function by means of an array of antennae, a signal to be transmitted by the array being weighted by a vector ({overscore (b)}d) of N complex coefficients, referred to as the transmission weighting vector, N being the number of antennae in the array, the array transmitting to a telecommunication terminal over a transmission channel, referred to as the downlink channel, a downlink transmission signal (Sd) and the said terminal transmitting to the said array over a transmission channel, referred to as the uplink channel, an uplink transmission signal (Su), the said downlink channel being disturbed by an isotropic noise (N?) and/or a directional noise, referred to as the downlink interference (Id), the said transmission weighting vector ({overscore (b)}d) being determined by means of a matrix product from a noise power matrix (Dd) which is a function of the power of the said isotropic noise and/or of the power of the said directional noise and a vector ({overscore (Cd)}),

Abstract: In a UMTS system, the AICH is arranged to send, in addition to signals acknowledging that a preamble (164) from a mobile (12) is at an acceptable strength, further signals (171, 176) acknowledging message signals (168, 178) from the mobile. Preferably the further signal (171) is a negative acknowledgement signal, indicating that a message (168) is corrupted. Application of the invention avoids the involvement of layer (2) in message acknowledgement.

Abstract: The present disclosure provides a method and apparatus for communicating a base band signal via a communication channel that connects a transmitter to a receiver comprising the steps of modulating the base band signal into a low frequency deviation modulated signal, transmitting the low frequency deviation modulated signal with a transmitter, receiving the low frequency deviation modulated signal with a receiver, mixing the received signal to an intermediate frequency signal, multiplying the intermediate frequency signal by to a multiplied frequency signal, multiplying a reference signal having a frequency generally equal to the center frequency of the intermediate frequency signal by a multiple that is one greater than or one less than the multiplied frequency signal to create a reference multiplied frequency signal, subtracting the reference multiplied frequency signal from the multiplied frequency signal to generate a wide band frequency signal, and discriminating the wide band frequency signal to obtain t

Abstract: A method for mobile communication by access points in a wireless local area network (WLAN) includes transmitting a first downlink signal on a common frequency channel from a first access point to a first mobile station, at a first downlink power level, which is adjusted responsively to a first uplink power level transmitted from the first mobile station to the first access point. If the first downlink signal received at a second access point is below a predetermined interference threshold, the second access point may transmit a second downlink signal on the common frequency channel to a second mobile station, simultaneously with transmission of the first downlink signal from the first access point to the first mobile station. The capacity of the WLAN may thus be substantially increased.

Abstract: A system is provided wherein a primary radio signal and a redundant radio signal are transmitted from a transmitter subsystem and received by a receiver subsystem. The output of an audio source is coupled to a modulator for modulating a radio frequency signal for coupling to a transmit antenna. A second output of audio source is coupled to a delay circuit, for adding a predetermined time delay thereto. The delayed audio source signal is coupled to a modulator for modulating a second radio frequency signal that is also coupled to the transmit antenna. The receiver subsystem receives both the primary radio signal and the delayed redundant radio signal and couples each to a respective demodulator. At least one demodulator includes a circuit for determining the degradation in the primary radio signal and provides a quality measurement output signal to a blend control circuit.

Abstract: The invention relates to a method of operating a communication network, the network comprising a plurality of stations which are able to transmit data to and receive data from one another. The method comprises monitoring, at each station, the transmission path quality between that station and each other station with which that station can communicate. Data corresponding to the monitored path quality is recorded at each station, thereby permitting a transmission power value based on the relevant path quality data to be selected when transmitting data to another station. Thus, the probability of transmitting data to any selected station at an optimum power level is increased. Each station transmits path quality data in its own transmissions as well as local noise/interference data, so that other stations can obtain path quality data for a particular station even if they are out of range of that particular station. The invention extends to communication apparatus which can be used to implement the method.

Abstract: A system for and method of providing Short Message Service (SMS) message notification to a cellular telephone customer regarding missed incoming calls that are missed while the cellular telephone is powered off. This is accomplished by generating a notification message at a SS7 gateway that includes caller ID/name ID information and/or time of the missed call. The message is preferably generated at the SS7 gateway only upon receipt of an “access denied” response with a reason code of “inactive” that is sent from a home location register in response to a location request sent by the SS7 gateway. Once the generated message is complete it is request sent to a message center where it is stored until it is retrieved by the cellular telephone soon after registration with the cellular network.

Abstract: Apparatus, and an associated method, for estimating frequency offset introduced upon symbols of a sequence communicated by a sending station to a data destination during operation of a communication system. A received sequence is rotated by multiplying the symbols thereof by offset values selected from a set of offset values. Then, for each rotated sequence, an estimation of a data sequence is made. Noise indicia associated with each estimated data sequence is calculated. And, comparisons are made of the noise indicia associated with each of the estimated data sequences. Responsive to the comparisons, selection is made of the frequency offset that has been introduced upon the data sequence.

Abstract: Received signal characteristics of multiple concurrently received channels are determined using an analytical approach for computation in lieu of the measurement based approach of the prior art. A receiving wireless transmit receive unit (WTRU) and method are provided for processing concurrent communication signals from a plurality of transmitting WTRUs that concurrently transmit successive data blocks in a plurality of K forward channels. The receiving WTRU preferably has a receiver configured to receive successive data blocks of K concurrent transmissions transmitted from the transmitting WTRUs on the respective K forward channels. A processor is configured to compute individual channel characteristics for each forward channel k based on the characteristics of data signals received on all K forward channel.

Abstract: A wireless synchronous time system comprising a primary master event device and secondary slave devices. The primary event device receives a global positioning systems “GPS” time signal, processes the GPS time signal, receives a programmed instruction, and broadcasts or transmits the processed time signal and the programmed instruction to the secondary slave devices. The secondary slave devices receive the processed time signal and the programmed instruction, select an identified programmed instruction, display the time, and execute an event associated with the programmed instruction. The primary event device and the secondary devices further include a power interrupt module for retaining the time and the programmed instruction in case of a power loss.

Abstract: A cellular system for handling outgoing calls from a mobile station (1) including, a network element (8) being capable of recognizing voiced commands and names, and has in memory a database of telephone numbers corresponding to an array of names. The mobile station (1) connects to the network element (8) and the mobile station user communicates the desired outgoing call function to the network element (8) by voice. This desired outgoing call function may be communicated while the mobile station (1) is engaged in using supplementary services provided by the network element (8), at any operation point in those services. The network element (8) evaluate the voice communication, retrieves any corresponding information, including telephone numbers, and communicates the necessary information need by the mobile station (1) to carry out the desired function to the mobile station (1).

Abstract: In one aspect of the present invention, a method and apparatus are provided. The method includes detecting a synchronization signal within a plurality of channels. The method includes selecting a subset of the plurality of channels, wherein the subset includes more than one channel. The method further includes determining if the synchronization signal exists on at least one of the subset of channels and initiating communications in response to determining that the synchronization signal exists on at least one of the subset of channels.

Abstract: A retransmission control method is provided. In the method, all base stations perform error judgment for a signal sent from a mobile station 1. Then, first and second base stations send results of error judgment to a third base station which is a communication partner of the mobile station 1. The third base station sends NACK for requesting retransmission to the mobile station 1 only when every result of error judgment of the first and second base stations indicates that there is an error.

Abstract: A method of eliminating irritating noise at the end of communication for a walkie-talkie which has a receiving loop. The method includes providing a first detector, determining whether a radio frequency signal in a predetermined frequency range received by the walkie-talkie belongs to a non-standard squelch signal by using the first detector, and if so, stopping the walkie-talkie from receiving subsequent radio frequency signals.

Abstract: A cordless communication device is provided in which a processor used to code and decode signals for the wireless communication is further used to process messages for an integral answering machine. An existing digital signal processor (DSP) within the cordless phone is used to code and decode signal for wireless communication between the base station and the handset. The coding scheme used for the wireless communication, for example, adaptive differential pulse code modulation (ADPCM), is also used for compressing, storing and retrieving messages used in the answering machine.

Abstract: An antenna calibration system consists mainly of a signal source, an antenna, a first radio frequency mixer, a first local oscillator, an power detecting device, a personal computer, and a servo amplifier. The signal source emits a signal, and the antenna receives the signal. The signal and the first local oscillator, which emits a signal, are emitted into the first radio frequency mixer. Then the first radio frequency mixer emits a signal into the energy detecting device which calculates the signal power, and transmits the power into the personal computer. The personal computer calculates the powers, and then transmits an angle control signal into the servo amplifier. The servo amplifier amplifies the signal, and then drives the antenna pedestal to turn until the antenna is aimed at the signal source. This can calibrate exactly the antenna's azimuth and elevation offset angle.

Abstract: A wireless headset for triggering a mobile phone in a mobile phone system to signal a location of the mobile phone and corresponding methods. A user can access incoming communication of the mobile phone through the wireless headset, and the wireless headset includes a control interface for making the wireless headset transmit a radio control signal to the mobile phone, such that the mobile phone will make predetermined sound or vibration to signal its own location.

Abstract: An RFID backscatter interrogator for transmitting data to an RFID tag, generating a carrier for the tag, and receiving data from the tag modulated onto the carrier, the interrogator including a single grounded-coplanar wave-guide circuit board and at least one surface mount integrated circuit supported by the circuit board.

Abstract: A method and apparatus for ad hoc addressing and group creation for wireless devices is described. A wireless communication device that has a sensor for sensing the contact or proximity of another wireless communication device forms a communication link with the second wireless communication device. The contact or close proximity of the two devices operates to identify the two devices for which a link will be established. This provides easy addressing of the desired device, and security as the user must initiate physically contacting or bring the device in very close proximity to the other device. Once the link is established data can be transferred between the two devices. In the simplest embodiment, the two devices are touched together and personal contact information is automatically exchanged. If a plurality of devices are in close proximity or touched together, an ad hoc network can be formed between all the devices. The network would be established for only as long as needed.

Abstract: A method and apparatus for calculating a representative measurement from multiple data measurements of signals from cellular base stations, thereby facilitating utilization of a cellular network to determine position of a mobile station even in non-line of sight and/or dynamic fading environments. A method for calculating a representative measurement includes determining a window of time, selecting data measurements within the window, and calculating a representative time of arrival responsive thereto, such as averaging all data measurements within the window. A representative RMSE estimate may be calculated. To determine a window of time all data measurements within a predetermined window from an earliest time of arrival may be selected. Alternatively the window may be determined by sliding over the data measurements. The data measurements may be stored in a database in a mobile station, and the database is updated to include each new measurement.

Abstract: An interface transceiver power management method and apparatus including controlled circuit complexity and power supply voltage reduces power consumption when interface conditions will support a transceiver having reduced complexity. The power supply voltage of the reduced complexity logic is then reduced if the lowered complexity will support a lower power supply voltage. The reduced complexity in combination with a reduced power supply voltage decreases power consumption to a greater degree than reducing transceiver complexity alone.

Abstract: A communication system and method for revising an updated target signal to interference ratio (SIR) ensure that the updated target SIR does not fall below a threshold target SIR that is required to ensure a specified minimum quality of service. In one aspect, the present invention provides a method for controlling an updated target signal to interference ratio in a communication system. In this method 180, an updated target signal to interference ratio is received (block 182). A threshold signal to interference ratio is established (block 184) and the updated target signal to interference ratio and the threshold signal to interference ratio are compared (block 186). The updated target signal to interference ratio is then set equal to the threshold signal to interference ratio if the updated target signal to interference ratio is less than the threshold signal to interference ratio (block 188).

Abstract: In a code division multiple access wireless communication system having at least one base transceiver station and at least one mobile station having a mobile station receiver assembly configured to receive a coded signal having an information-bearing signal portion and an associated interfering signal portion from the base transceiver station, a method and apparatus for automatic gain control compensation in the mobile station receiver assembly, is disclosed. The method includes causing a gain adjustment to the coded signal by an AGC circuit in the mobile station receiver assembly to produce a post-AGC signal having a post-AGC interfering signal portion with an associated post-AGC interfering signal power level, and an associated gain error value. The method further includes compensating for the gain adjustment to the coded signal if the number of receiver fingers assigned to demodulate the coded signal is less than or equal to a predetermined number.

Abstract: A system for and method of providing Short Message Service (SMS) message notification to a cellular telephone customer regarding missed incoming calls that are missed while the cellular telephone is unavailable such as when the telephone is powered off. This is accomplished by generating a notification message at a SS7 gateway that includes caller ID/name ID information and/or time of the missed call. The message is preferably generated at the SS7 gateway only upon receipt of an “access denied” response with a reason code of at least one of MS Inactive, Busy, No Page Response or Unavailable that is sent from a home location register in response to a location request sent by the SS7 gateway. Once the generated message is complete it is sent to a message center where it is stored until it is retrieved by the cellular telephone soon after registration with the cellular network.

Abstract: Systems and methods for controlling subscriber unit power level using power measurements made on access request transmissions. Since a subscriber unit access request typically precedes a subscriber unit data transmission by a relatively short period of time, the data transmission power level will then be based on a recent power measurement. The access request may also trigger a sequence of power control steps including the transmission of special upstream power measurement transmissions which can be used as the basis for even more accurate power control. These power control features are particularly useful in fading environments such as found in a wireless system.

Abstract: A method (30) (and equipment adapted to operate according to the method) for enabling or disabling (i.e. triggering) an attribute of communication between a UE device and a NodeB under the control of a RNC using System Information Blocks (SIBs) as a way of configuring communication channels provided by the RNC, the method including: a step (35) in which the NodeB configures itself for communication with the UE device according to a trigger field (40) consisting of typically several bits corresponding to one or more attributes and included in one or more SIBs; and a step (35) in which the NodeB transmits to the UE device the SIB(s) including the trigger field. A multi-bit trigger field can be used to simultaneously control either a number of attributes, or can be interpreted as indicating a value of a single, multi-level attribute (or can be used both ways at the same time).

Abstract: A remote control device for an audio/video system is disclosed. The remote control device is capable of receiving a video signal from a television tuner, the video signal suitable for display on a remote control display, and further capable of displaying the video signal on the remote control display. The remote control device is further capable of receiving an audio signal from the television tuner, and capable of broadcasting the audio signal to a user.

Abstract: A circuit configuration has a radio-frequency section with a receiving mixing stage, and has a signal processing circuit with an A/D converter, a digital filter and a frequency estimator. The frequency estimator continuously determines a first frequency correction control signal, which is representative of a frequency offset between the frequency of an IF received signal and a frequency which is characteristic of a pass band of the filter. The first frequency correction control signal is used for readjustment of the mixing frequency.

Abstract: A method and an arrangement are provided for timing a change of diversity weights in a radio connection between a base station and a terminal. A response timing mode is selected from a number of predefined response timing modes. The terminal is informed about the selected response timing mode. An initiation is received from the terminal and it is responded to the initiation by changing certain diversity weights so that the exact moment of time for effecting the change is determined by the selected response timing mode.

Abstract: An apparatus and method for measuring the quality of a reverse link and the load of a base station (BTS) in a CDMA mobile telecommunication system. The apparatus and method periodically detect the power of a receiving signal from a mobile station to a BTS, constructs a practical statistical distribution curve for a power ratio of signal to interference, compares the practical distribution curve with the theoretical distribution curve pre-constructed based upon the parameter condition of a BTS, and determines the quality of a reverse link based upon the difference between the distribution curves.

Abstract: A radio broadcasting system, transmitter, receiver, method and signal are provided wherein a program signal is combined with a data signal, the data signal not only includes information on an indicated program signal, but also data of a data service and information on the data service, such as, an identification of the data service, alternative frequencies, information on related data services etc. In this way, it is possible to broadcast the data service on a network differing from the network broadcasting the program signal. This is of particular use in the Radio Data System.

Abstract: A transmission circuit for realizing a rate adaptation layer of a digital communication system. The transmission circuit includes a processor and a format conversion circuit. The processor is capable of managing transmission rates of input and output digital signals of the digital communication system. The format conversion circuit includes a plurality of input units and output units; each input unit is for receiving a bit according to the input digital signal, and each output unit is for transmitting a bit to form the output signal. Each input unit and output unit are connected by hardware wires to realize data formatting such as bit-reordering, command insertion.

Abstract: A master slave cellular communication system includes a master cellular communication device and at least one slave wireless communication device. The master cellular communication device may include a power supply, a micro controller with associated memory, a clock, a transceiving block, an antenna, and an input/output interface coupled to each other via a communication bus and disposed on a circuit board. The slave wireless communication device(s) may be incorporated in any type of powered electronic device, and may include a power supply, a micro controller with associated memory, a clock, a transceiving block, an antenna, and an input/output interface coupled to each other via a communication bus and disposed on a circuit board. The slave wireless communication device(s) may also include one or more modules that may be interconnected to the slave wireless communication device(s) through connectors on a housing of the slave wireless communication device(s).

Abstract: A wireless interface device services communications between a wirelessly enabled host and at least one user input device. The wireless interface device includes a wireless interface unit, a processing unit, an input/output unit, and a power management unit. The wireless interface unit wirelessly interfaces with the wirelessly enabled host using a communication interface protocol. The power management unit operably couples to the wireless interface unit, the processing unit, and the input/output unit. The power management unit and the processing unit operate to control the power consumption of the wireless interface unit and the processing unit by powering down the wireless interface device and controlling the power consumption of the processing unit. The input/output unit remains powered to detect user input. When user input is detected, the wireless interface unit and processing unit are fully powered.

Abstract: A system and method for variable rate closed loop power control in a wireless communications system, such as a CDMA spectrum system. A base station receives the reverse link transmission from a wireless terminal unit (WTU) and determines the signal quality of the reverse link, measures the signal-to-interference ratio (SIR) or other signal quality indicators of the received signal to determine any power adjustments required for the uplink transmission power. The base station also processes the uplink transmission signal to determine whether the rate of transmitting power control data to the WTU should be changed from the current rate. If so, the base station either (1) sends a power control rate change command to the WTU via the downlink, and sends subsequent power control commands at the newly determined rate, or (2) sends subsequent power control commands at the newly determined rate without sending a power control rate change command.

Abstract: Selective reverse mobile frame biasing is provided for improved network control between a mobile unit (102) and a base station (132) responsive to power control bits from the base station. Signaling messages (124) received at the base station (132) are monitored to identify signaling messages requiring the mobile unit to send a response containing a critical signaling message. The base station (132) informs the mobile unit (102) to send the response containing the critical signaling message with an increased power bias for the duration of the message. Transmission power of the mobile unit (102) is allowed to decay after the critical signaling message is sent.

Abstract: A wireless communication device comprises a power amplifier configured to amplify a power level of a transmit signal to a required transmit power level and a transmission line coupled with the power amplifier. The transmission line is configured to convey the amplified transmit signal. The wireless communication device also comprises a power control circuit that includes a bi-directional coupler detector coupled with the transmission line. The bi-directional coupler detector is configured to sense a forward power level and a reflected power level in the transmission line. The power control circuit may be configured to adjust the required transmit power level based at least in part on the forward and reflected power levels sensed by the bi-directional coupler detector. The power control circuit may also adjust an impedance of an impedance matching circuit based at least in part on the reflected power level sensed by the bi-directional coupler detector.

Abstract: The present invention provides a method and apparatus for reducing scanning times by eliminating from consideration channels where the measured power is substantially comprised of adjacent channel power. The method and apparatus include measuring the received channel power (302) from neighboring cells, and attempting to acquire or otherwise identifying signals from the channels of the neighboring cells (306) in descending order of a sorted list of received channel power. When a signal from the channel of a neighboring cell is successfully acquired or otherwise identified, an amount of adjacent channel power is determined (310), based upon an expected power profile of the acquired or otherwise identified signal. The determined adjacent channel power is then compared against the power measured for the corresponding channel (312). Where the measured power is substantially comprised of adjacent channel power, the channel is removed from the list of channels to acquire (316).

Abstract: A method and apparatus that determines how much power to allocate to each of a plurality of reverse link power control (RLPC) Channels to be transmitted from a base station, based upon data rate control (DRC) messages transmitted to the base station. Historical information is used to determine the quality of the Forward Link over which the RLPC is to be transmitted. If the history of the DRCs received indicates that the remote station to which the RLPC Channel is to be directed has not transmitted a DRC recently, then the base station allocates power to the RLPC Channels based upon information provided to the base station in DRCs that were received by the base station, but that were directed to other base stations. Accordingly, the base station can allocate power among the RLPC Channels without having received explicit information as to the quality of the Forward Link between the base station and every remote station intended to receive the information on the RLPC Channels.

Abstract: Methods and systems for load sharing signaling messages among signaling links in a network utilizing an international signaling protocol are disclosed. A routing node receives a signaling message formatted according to an international signaling protocol. The routing node generates a signaling link selection parameter for the signaling message. The routing node selects an outbound signaling link based on the generated signaling link selection parameter. The number of bits in the generated SLS value is user-configurable, thus allowing load sharing among arbitrary numbers of signaling links.

Abstract: Wirelessly linking a portable audio device to an external audio system permits the external audio system to generate audible signals that enhance local playback of audio by the portable device. For example, the portable device wirelessly transmits lower frequency components of an audio signal to a subwoofer system for reproduction of bass frequencies extending below the playback capability of the portable device. In this manner, the external audio system provides bass enhancement for the portable audio device. Wireless transmissions between the portable audio device and the external audio system may be, but are not limited to, optical or radio frequency (RF) transmissions. Where RF signaling is used, the wireless link may be based on wireless network links, such as those supported by Bluetooth and 802.11b standards, or based on, for example, dedicated RF interfaces.