Abstract: A method for calibrating a receiver of an isolator product includes adjusting a peaking frequency of a receiver signal path of a first integrated circuit die of the isolator product and a gain of the receiver signal path based on a predetermined peaking frequency, a predetermined gain, a first level of a diagnostic signal during a first interval, and a second level of the diagnostic signal during a second interval. The first interval and the second interval are non-overlapping intervals. The method may include receiving a calibration signal on a differential pair of nodes of the receiver signal path of the first integrated circuit die. The method may include generating a diagnostic signal corresponding to an average amplitude of a received version of the calibration signal.

Abstract: A method for calibrating a receiver of an isolator product includes adjusting a peaking frequency of a receiver signal path of a first integrated circuit die of the isolator product and a gain of the receiver signal path based on a predetermined peaking frequency, a predetermined gain, a first level of a diagnostic signal during a first interval, and a second level of the diagnostic signal during a second interval. The first interval and the second interval are non-overlapping intervals. The method may include receiving a calibration signal on a differential pair of nodes of the receiver signal path of the first integrated circuit die. The method may include generating a diagnostic signal corresponding to an average amplitude of a received version of the calibration signal.

Abstract: Provided is a probe which transmits an ultrasonic wave to a diagnostic site and receives a reception signal which is a reflected wave.

Abstract: Systems and methods for controlling a signal amplifier unit configured with an electronic communication device are disclosed. The signal bar level on the electronic communication device is determined, and the signal amplifier unit is turned on based on the determined signal bar level. The signal level of the signal amplifier unit may be measured, and attenuation may be added based on the measured signal level. The measured signal level may be compared to a target level.

Abstract: An apparatus includes a tunable non-Foster matching network having (i) an amplification stage with an amplifier and (ii) a reference reactance coupled in parallel with the amplifier. The non-Foster matching network is configured to provide a negative reactance based on the reference reactance. The amplification stage also includes at least one adjustable circuit element configured to adjust a gain of the amplification stage and thereby adjust the negative reactance. In some cases, the amplification stage may include a common emitter amplification stage having a transistor, and the at least one adjustable circuit element may include an adjustable capacitor and/or multiple adjustable resistors in an emitter circuit of the transistor. In other cases, the amplification stage may include an operational amplifier and multiple resistors configured to set a gain of the operational amplifier, and the at least one adjustable circuit element may include at least one of the resistors.

Abstract: Provided is a method for processing a signal adaptively to a noisy environment, the method including: determining a class related to enhancement of intelligibility, based on a noise spectrum of a reception side or a near-end device and a received voice spectrum; generating guide information for the enhancement of intelligibility based on the noise spectrum, the voice spectrum, and the determined class; and generating a changed voice spectrum by applying the guide information to the voice spectrum.

Abstract: A receiver circuit is provided. The receiver circuit includes an antenna configured to receive a radio frequency (RF) signal; a filter configured to filter the RF signal received by the antenna; and a passive mixer circuit configured to adjust a center frequency of the filtered RF signal to a predetermined frequency. The passive mixer circuit includes: a transformer which includes a first coil and a second coil that is separate from the first coil; a first passive mixer which is directly connected to a first end of the second coil; and a second passive mixer which is directly connected to a second end of the second coil and is separate from the first passive mixer.

Abstract: One embodiment is directed to a repeater system configured for use with a base station that implements a wireless interface that makes use of control transmissions that are retransmittable (for example, LTE PRACH transmissions). The repeater system implements a simplified mute or squelch function that transitions the repeater circuitry from a muted state to an unmuted state in response to a received power level crossing a first threshold value in connection with a first control transmission. Although that first control transmission will be lost, the repeater circuitry is configured to remain in the unmuted state in order to handle a retransmitted control transmission and to handle any associated subsequent control and user transmissions. The repeater system can be implemented as a single-node repeater and/or a distributed antenna system. Other embodiments are disclosed.

Abstract: A radio includes a first tuner and a second tuner. A processor compares a first perceivable volume level of a station tuned by the first tuner to at least one second perceivable volume level of at least one background station tuned by the second tuner. The processor enables automatic volume knob changes using a pre-calibrated lookup table that associates a volume step of the volume knob with a difference between the first perceivable volume level and the second perceivable volume level.

Abstract: A circuit tuneable between first and second frequencies comprising gain control circuitry operable to control the gain of the circuit between the first and second frequencies, the gain control circuitry comprising a resistor network having: at least two resistor lines arranged in parallel, each resistor line comprising one or more resistors; and for each resistor line, a switch operable to select or deselect the corresponding resistor line; the resistor lines and switches being arranged such that the net resistance of the resistor network is the parallel sum of each of the selected resistor lines; and logic circuitry configured to control said switches so as to minimize the variation in gain of the circuit between the first and second frequencies.

Abstract: There is provided an electronic gain shaper for open loop adaptive optimising of broadband microwave circuits, the gain shaper comprising operating parameter selection means [100] adapted for providing one or more operating parameters; and a lossy tuning element operably coupled to the operating parameter selection means, wherein, in use, the gain shaper is adapted for receiving an operating mode; retrieving an operating parameter from the operating parameter selection means [100] in accordance with the operating mode; and configuring the lossy tuning element in accordance with the operating parameter.

Abstract: In a method and a mobile communications receiver for processing signals from a first cell and a second cell a timing of the signal from the first cell and the second cell is obtained. A timing difference (?) between the timings of signals from the first and the second cell is determined and based on that a timing (?) for a window for discrete Fourier transform, DFT, processing is adjusted. DFT processing of the signals using the timing (?) of the DFT window is then performed.

Abstract: Provided are a receiving apparatus and method for a wireless communication system using multiple antennas. A receiving method for a wireless communication system using multiple paths, the receiving method comprising: receiving signals through a predetermined number of multiple paths; sensing a carrier according to saturation state degrees of the signals, and providing saturation state information; calculating automatic gain components of the received signals by using the received signals and the saturation state information of the received signals; and performing a noise matching process to amplify noises on the predetermined multiple paths according to the automatic gain components during a predetermined period.

Abstract: An encoded information reading (EIR) terminal can comprise a microprocessor electrically coupled to a system/data bus, a memory communicatively coupled to the microprocessor, an EIR device, a multi-band antenna, and a wireless communication interface. The EIR device can be provided by a bar code reading device, an RFID reading device, or a card reading device. The EIR device can be configured to output raw message data containing an encoded message and/or output decoded message data corresponding to an encoded message. The wireless communication interface can comprise a radio frequency (RF) front end electrically coupled to the multi-band antenna. The RF front end can comprise a micro-electromechanical (MEMS) filter array including one or more band-pass filter. Each band-pass filter of the MEMS filter array can be electrically coupled to a bias voltage source or an oscillating signal source.

Abstract: In a method and a mobile communications receiver for processing signals from a first cell and a second cell a timing of the signal from the first cell and the second cell is obtained. A timing difference (?) between the timings of signals from the first and the second cell is determined and based on that a timing (?) for a window for discrete Fourier transform, DFT, processing is adjusted. DFT processing of the signals using the timing (?) of the DFT window is then performed.

Abstract: Systems, apparatuses and methods for providing FM phase diversity capabilities are provide. In some aspects, a vehicle system includes a first FM antenna positioned externally of a vehicle and adapted to receive a first FM signal, a radio unit positioned internally of the vehicle and including a display and at least one user control, a cable electrically coupled to the first FM antenna and the radio unit to communicate the first FM signal to the radio unit, and a second FM antenna positioned internally of the vehicle and adapted to receive a second FM signal that is communicated to the radio unit. In another aspect, a radio unit positioned internally of the vehicle may include a printed wire board and a second FM antenna may be positioned on the printed wire board internally of the vehicle and adapted to receive a second FM signal.

Abstract: Method for managing power and bandwidth resources in operation over a plurality of links from a hub, said power and bandwidth resources being limited, the method comprising: initially assigning power and bandwidth combinations to individual links according to current conditions pertaining to respective links, each combination having a corresponding resource cost; and controllably changing said initially assigned combinations at respective ones of said links to reduce respective resource costs, thereby to controllably balance an overall resource cost of said plurality of links to lie within available overall power and bandwidth resource limitations.

Abstract: A receiver (400; 500) comprising an amplifier (406; 506) having an input (408) and an output (410). The input (408) of the amplifier is configured to receive a signal. The receiver also comprises a feedback path (412; 512) between the output (410) and the input (408) of the amplifier (406; 506), wherein the feedback path (412; 512) includes a filter (402; 502) and a buffer amplifier (414; 514) in series. The input of the buffer amplifier (414; 514) is connected to the output (410; 510) of the amplifier (406; 506). The output of the buffer amplifier (414; 514) is connected to the input of the filter (402; 502). The output of the filter (402; 502) is connected to the input (408; 508) of the amplifier (406; 506). The filter (402; 502) is configured to pass signals having a desired frequency.

Abstract: In one embodiment, the method includes determining if a next interval of a bandwidth is available if an interval of the bandwidth preceding the next interval was determined to be available such that the next interval is larger than the preceding interval.

Abstract: Disclosed is a radio frequency (RF) receiver for receiving a communication channel modulated on one or more carrier frequencies. The receiver may include a gain adjustable RF amplifier, a wideband signal power measurement circuit, and control logic. The control logic may be adapted to use outputs of one or more measurement circuits to classify interfering signals based on measured signal power and spectral proximity to the one or more channel carrier frequencies, and to adjust the gain of the radio frequency amplifier based on the classification.

Abstract: In a digital receiver, a noise attenuation and signal magnitude mapping variable amplifying unit includes a filter and an amplifier, amplifies and band-bass filters an analog signal and attenuating white noise and an interference signal other than a band signal. An ADC performs subsampling on a carrier frequency of a desired signal and performs oversampling on the band of the desired signal by using a sampling frequency to convert the analog signal which has passed through the noise attenuation and signal magnitude mapping variable amplifying unit into a digital signal of a direct conversion frequency band or an intermediate frequency band. The ADC has a dynamic range for processing both the desired signal and an undesired signal adjacent to the desired signal. A digital signal processing unit converts a signal frequency of the digital signal or digital-filters an undesired signal within the digital signal and processes the digital signal by digitally adjusting a gain.

Abstract: A method of operating a single-tuner radio includes tuning into a first frequency. A pause in a first signal associated with the first frequency is detected. Tuning is switched from the first frequency to a second frequency. A signal quality metric for the second frequency is measured. Tuning is switched from the second frequency to the first frequency.

Abstract: A compact automatic gain control module for an RF amplifier includes a microchip Tuner for detection of pilot signals in an incoming RF signal. By selectively tuning into pilot signals in response to command from an on-board microprocessor, the module is frequency agile in the selection of pilot signals, selecting specifically advantageous signals for use as a pilot. Use of a microprocessor also enables specific advantages in receiving firmware upgrades to incorporate algorithms for operation parameter monitoring and adjustment of response in accord with monitored parameters. Such monitoring also enables the recording of on-module events that enable storage of a log to enable maintenance and performance enhancement within the module.

Abstract: A method and apparatus is disclosed that controls voice call quality by networks and maintains the optimal voice call quality in a portable terminal. The voice call quality control method includes: identifying a network, connected to the portable terminal when the portable terminal enters a voice call mode, and a value for applying voice call quality of the network; changing a value for setting voice call quality, performed in the network, by the value for applying voice call quality; and controlling voice call quality of a voice call mode in the network by the altered value for setting voice call quality.

Abstract: In some embodiments, a media device is configured so that it automatically causes a first predetermined channel to be displayed on an output device when a user sends a request signal to the media device to turn the output device off. The media device may be configured so that it causes the output device to shut off after the first predetermined channel has been on for a dwell period of time after the request signal has been received. The dwell period of time may be approximately two seconds. In some embodiments, a media device is configured so that it automatically causes a first predetermined channel to be displayed on an output device when a user sends a request signal to the media device to turn the output device on. In some embodiments, the media device is a television device. In other embodiments, the media device is a radio device.

Abstract: Provided are apparatuses, systems and methods for performing communication using wireless power. According to one general aspect, a communication device using wireless power may include: a controller configured to determine whether a mutual resonance occurs between a target resonator and a source resonator; and a modulator configured to modulate data based on whether the mutual resonance occurs.

Abstract: A system for controlling an RF gain of a receiver that reduces a time taken to maintain an input signal level at an optimum dynamic range is provided. The system includes a tuner that receives a radio frequency (RF) signal and down-converts the RF signal to an intermediate frequency (IF) signal, and a demodulator. The tuner includes a radio frequency programmable gain amplifier (RF_VGA), a filter and an IF programmable gain amplifier (IF_VGA). The demodulator includes an analog to digital converter (ADC), and an Automatic Gain Control (AGC) unit that (i) receives a digital signal and an IF gain of the IF_VGA. The ADC samples a filtered IF signal under oversampling conditions to obtain an oversampled signal that includes an in-band signal and an out-of-band signal. The AGC unit (ii) controls the RF_VGA, the IF_VGA and (iii) measures an RF energy of the RF signal.

Abstract: Provided are apparatus and method for receiving signals in a wireless communication system.

Abstract: Speech signals to be sent between a first node and a second node via a wireless communication system are Adaptive Multi-Rate (AMR) encoded. A need to change the first node's first data transmission rate over a radio interface to a second different data transmission rate is determined. A new AMR source bit rate is then determined for both nodes. Information is sent to the second node, in advance of changing the data transmission rate over the radio interface, requesting the second node to change towards the new AMR source bit rate. After a predetermined time period sufficient for the second node to change from the current AMR source bit rate to the new AMR source bit rate expires or after the second node indicates a change to the new AMR source bit rate, the first node starts transmitting at the second data transmission rate over the radio interface.

Abstract: A circuit tuneable between first and second frequencies comprising gain control circuitry operable to control the gain of the circuit between the first and second frequencies, the gain control circuitry comprising a resistor network having: at least two resistor lines arranged in parallel, each resistor line comprising one or more resistors; and for each resistor line, a switch operable to select or deselect the corresponding resistor line; the resistor lines and switches being arranged such that the net resistance of the resistor network is the parallel sum of each of the selected resistor lines; and logic circuitry configured to control said switches so as to minimise the variation in gain of the circuit between the first and second frequencies.

Abstract: An automatic gain control circuit is provided for an input signal in the form of a dc reference level and a superposed amplitude modulated ac data signal. A feedforward AGC loop has a low pass filter for deriving the level of attenuation from the attenuated dc reference level. A multiplier value (G) is based on the reciprocal of the level of attenuation (?) and this multiplier enables an output signal to be generated comprising a constant multiple (DG) of the input signal.

Abstract: In order to enable a driver to obtain traffic jam information or to listen to a navigation guidance voice from a car navigation system without interrupting the reproduction of music when a passenger enjoys music reproduced by a CD player and the like through cabin loudspeakers, the present invention provides car audio equipment in which a pair of loudspeakers is disposed on both sides of a headrest of a driver's seat. The equipment processes at a decoder thereof a sound signal from a radio tuner, a car navigation device, a mobile phone and the like selected by a selector using a changeover switch, and the sound signal is reproduced through the loudspeakers.

Abstract: An anti-theft system, especially in the form of an access and/or starting system for a vehicle has a vehicle-mounted receiver for receiving a request signal containing the instruction to find out whether objects that are associated with the vehicle, e.g. lost identifiers, are located in specific areas of the vehicle. The anti-theft system further has a vehicle-mounted control and evaluation unit for verifying whether the objects are in the specific areas of the vehicle and outputting information on whether an object that is associated with the vehicle has been found. The anti-theft system finally has a vehicle-mounted transmitter for transmitting a result signal containing the information on whether objects have been found. Such an anti-theft system allows an identifier, for example, which is associated with a user, to start a search from a distance in order to verify whether certain objects are located near or inside the vehicle.

Abstract: A degree of seal of an ear about a speaker port may be estimated by detecting touch contact between the ear and at least one touch sensor in fixed relation to the speaker port. The degree of seal is estimated based on the detected touch contact. Based upon the estimated degree of seal, the acoustic output of the speaker may be adjusted. The adjustment may compensate for perceived changes to the quality of the acoustic output resulting from the degree of seal. The at least one touch sensor may be a plurality of touch sensors spaced around the speaker port. Each sensor may have a truncated wedge shape, with a narrow end closest to the speaker port. Upon receipt of user input indicative of a high degree of ear seal, a sample of the sensor(s) may be taken and stored for using during future estimation of the degree of seal.

Abstract: The invention relates to a communication apparatus having automatic gain control apparatus and automatic gain control method. It comprises a communication apparatus with automatic gain control apparatus, a signal power calculation apparatus to calculate a first power value of the first digital signal. The operation of gain apparatus is based on the first gain value. The channel status decision apparatus decides the first channel status of the first gain value. The first digital signal has an update period of automatic gain control. The demodulator sends out the first channel impulse response to the automatic gain control apparatus. The channel status decision apparatus adjusts the update period of automatic gain control according to the first channel status of the first digital signal.

Abstract: An electric wave receiving apparatus comprises: an antenna; an amplifier; filter circuits that extract signals in different frequency bands from an output of the amplifier; detector circuits that demodulate time codes from outputs of the filter circuits; automatic gain control circuits that generate gain control signals from the detector circuits; a selector that selects one gain control signal indicating a maximum signal level among the gain control signals; and an arithmetic processing section to be able to analyze the time codes of outputs of the plurality of detector circuits, wherein the one gain control signal is supplied to the amplifier to control an amplification factor of the amplifier so that signal levels output from detector circuits do not become excessive, and the arithmetic processing section selects an output to enable the analysis of the time code among the outputs of detector circuits to perform the analysis of the time code.

Abstract: A controlling unit includes: a memory unit that stores information in which the multiple clock frequencies that satisfy conditions for predetermined reception interferences to apart of multiple carrier frequencies included in a band frequency of the broadcast wave are previously set so that not all clock frequencies satisfy the conditions for the reception interferences to the same carrier frequencies, the information indicating a relation between each clock frequency and the carrier frequency that includes the reception interference; a reception frequency setting unit that sets the carrier frequency to be received to the broadcast wave receiving unit; a clock frequency determining unit that refers to the information stored in the memory unit and determines a clock frequency that does not include a reception interference to the carrier frequency that is set by the reception frequency setting unit, the determined clock frequency being out of the multiple clock frequencies; and a clock frequency setting unit th

Abstract: The circuit arrangement comprises a tuner with a control amplifier and a mixer connected downstream, and an automatic gain control. The automatic gain control contains a weighting filter, which is connected to the output of the mixer, upstream of an intermediate frequency filter, and which supplies the control signal for the control amplifier of the tuner via a detector. The weighting filter has, in particular, a passband, which corresponds to the passband of the intermediate frequency filter and at least partly encompasses at least one or two adjacent program channels. As a result of this, the control amplifier is better tuned under difficult reception conditions, since, by means of the weighting filter, adjacent channels, relative to the passband of the intermediate frequency filter, are also concomitantly included in the control signal.

Abstract: A method and apparatus provide multichannel signal limiting to prevent any channel signal within a multichannel signal from exceeding defined limits, while still preserving the gain and/or amplitude relationships among the individual channel signals. A limiter is configured to calculate a limiting factor as the value needed to prevent a limit violation on the worst-case one of the channel signals, and then commonly apply that limiting factor to the gain control of all channel signals. Thus, the limiter may generate an actual gain value for each channel signal as the product of that channel signal's desired gain value and the current value of the limiting factor. Notably, in multichannel audio signal applications, coordinating gain control across the individual audio channels by use of the commonly applied limiting factor prevents undesirable spatial shifting of the soundstage, e.g., shifting of the stereo image.

Abstract: A channel-select decimation filter capable of operating in multiple bandwidth modes includes a first low pass filter stage, a variable gain stage, a subtraction module a second low pass filter stage and a down-sampling module. The first low pass filter stage includes a first programmable delay module for filtering input signals to produce first low pass filtered signals. The variable gain stage applies a programmable gain to the input signals to produce gained input signals. The subtraction module subtracts the first low pass filtered signals from the gain input signals to produce first stage signals. The second low pass filter stage includes a second programmable delay module for filtering the first stage signals to produce channel-selected signals. The first programmable delay module, second programmable delay module and programmable gain are programmed to implement one of the multiple bandwidth modes.

Abstract: Disclosed is a multi-mode radio frequency amplifier. The amplifier includes a plurality of input transistors, a plurality of output branches, and a switching stage interposed between the plurality of input transistors and the plurality of output branches for selectively connecting the plurality of input transistors to the plurality of output branches. Individual ones of operational modes of the multi-mode amplifier correspond to an individual one of the plurality of frequency selective loads. A particular one of the plurality of frequency selective loads is one of operating or non-operating during operation of the multi-mode amplifier. A gain of the multi-mode amplifier is reduced by controlling the plurality of elements to steer a predetermined portion of a total signal current that is output from one of the input transistors, from an associated operating frequency selective load to a non-operating frequency selective load.

Abstract: A system that incorporates teachings of the present disclosure may include, for example, a method involving a step to tune a plurality of tunable reactive elements by measuring a drift in reactance of at least one of the plurality of tunable reactive elements away from a desired reactance. Additional embodiments are disclosed.

Abstract: In a vehicular navigation system, “AT command +CIEV” is received from a cellular phone by a BLUETOOTH communications. The received “+CIEV” is determined to identify a phoning state (or call state) of the cellular phone. A sound corresponding to the identified phoning state is outputted via a speaker in a corresponding sound volume level stored in an external memory device. A sound volume level, which was finally set for a certain phoning state, is not continuously used as an initial sound volume level for a subsequent phoning state different from the certain phoning state. An incoming sound, dialing sound, calling sound, and communicating sound are individually outputted in appropriately set sound volume levels, which enhances usability of the navigation system for users.

Abstract: A disclosed method tunes a signal from a channelized spectrum having a predetermined channel spacing. A signal of interest having a predetermined maximum bandwidth is mixed with a local oscillator signal, which has a frequency that is an integer multiple of the channel spacing or one-half of a channel spacing displaced from an integer multiple of the channel spacing. The local oscillator signal is selected to frequency translate the signal of interest to within a near-baseband passband whose lower edge is spaced from DC by at least about the maximum bandwidth of the signal of interest. Problems associated with 1/f noise, DC offsets, and self-mixing products are avoided or substantially diminished. Other methods and systems are also disclosed.

Abstract: An Automatic Gain Control (AGC) circuit as used in a digital receiver that utilizes a main loop filter that is of a relatively wide bandwidth. A pre-filter, wideband variance is determined from the input digital signal, and a post-filter, narrowband variance is also determined. The wideband and narrowband variances are then compared to determine if the wideband signal power indicates a variance level that is too great to permit normal loop operation. By reapplying this difference in the power levels to the filter output as needed, such as by a scaling operation, the loss in dynamic range is effectively recovered. In a preferred embodiment, an adjustable gain input amplifier feeds an intermediate frequency (IF) signal to an analog-to-digital converter (ADC). The digitized IF signal is then down-converted to a baseband frequency and subjected to digital filtering. A narrowband sample variance (PN) of the digitally filtered (narrowband) data is then determined.

Abstract: An apparatus is capable of distributing an input signal to multiple tuners within a dwelling unit using an architecture that is advantageous in terms of layout and expandability. According to an exemplary embodiment, the apparatus includes an amplifier operative to receive an input signal having a plurality of channels, and to amplify the input signal to generate an amplified signal. A plurality of serially connected couplers is operative to couple the amplified signal to a plurality of tuners.

Abstract: A terminal is provided. The terminal comprises a tuner converting a received high-frequency signal, a VSB (vestigial side band) demodulator demodulating the output signal of the tuner into a VSB signal, a DMB (digital multimedia broadcasting) demodulator demodulating the output signal of the tuner into a DMB signal, a decoder decoding the demodulated VSB signal or the demodulated DMB signal into an image signal, and a controller controlling at least one of the tuner, the VSB demodulator, the DMB demodulator, and the decoder.

Abstract: A system for receiving signals and performing autoranging is disclosed. The system includes an adjustable attenuator at an input. A mixer combines the input signal with a tuning frequency to generate a mixed signal. The mixed signal is filtered to generate a component of the input signal at the tuning frequency. A signal detector detects the signal level of the input signal and the adjustable attenuator is adjusted in response to the signal level.

Abstract: An embodiment of the present invention provides a method of closed loop MIMO calibration in a wireless communication system, comprising detecting that station calibration is obsolete and requires calibration, determining a range of automatic gain control which the station wants to calibrate and determining a list of transmission power for an Access Point (AP) in communication with the station, initiating by the station the calibration by sending the power list and N channel sounding preambles, where N is the number of transmit antennas at the station; and sending back by the AP a channel matrix and L sets of channel sounding preambles with a different transmission power level for each set, where L is the number of entries in the power list.

Abstract: In a portable telephone which transmits and receives data having at least one of a voice signal and an image datum which are radio signals, the controlling device controls an amplifier so that a user can hear, at a first state that an ear is not near to a speaker, the voice from the speaker when the data from a base station includes a discrimination datum which represents the image datum. The controlling device controls the amplifier so that the user can hear, at a second state that the ear is near to the speaker, the voice from the speaker when the data from the base station does not include the discrimination datum which represents the image datum.