Abstract: A multi-matching sensing system applied to a vehicle includes a rotation drum to which first, second and third pop-up modules pulled by electromagnetic attraction according to the supply of current and pushed by a spring restoring force of the spring are fixed to have angle relationship, a rotation device configured to rotate the rotation drum, and a multi-matching body holder having a connector connected to a wire harness in which a power line is formed with a transmission/reception circuit connected to each of the first, second and third pop-up modules and the rotation device.

Abstract: Methods, systems, and computer program products that provide streaming capabilities to audio input and output devices are disclosed. An audio processing device connects an upstream device to a downstream device. The upstream device is plugged into an input port of the audio processing device. The audio processing device intercepts a signal from the upstream device to the downstream device. The audio processing device converts the signal to digital data and streams the digital data to a server. The digital data can include metadata, e.g., an input gain. The audio processing device can adjust the input gain in response to instructions from the server. The audio processing device feeds a pass-through copy of the audio signal to an output port. A user can connect the downstream device in a usual signal chain into the output port of the audio processing device. The streaming does not affect the user's workflow.

Abstract: A wearable device includes a body having fasteners and a frame coupled between two fasteners. The frame includes first and second sections. A first portion of the body includes the first section of the frame and one fastener and a second portion of the body includes the second section of the frame and the other fastener. A speaker and a microphone are connected to the first portion and another speaker and another microphone are connected to the second portion. The body also includes a processor, memory accessible to the processor, and programming in the memory for configuring the processor to selectively activate the speakers and microphones such that a first speaker emits an output sound signal while a first microphone and a second speaker are deactivated and a second microphone captures an input sound signal during the emission of the output sound signal by the first speaker.

Abstract: Disclosed are techniques to improve power consumption of portable audio devices through the use of a plurality of adapters. Each of the plurality of adapters can be used to modify and/or enhance the functionality of the portable audio device. The portable audio device can include respective circuitry that is activated in response to detecting that a specific one of the plurality of adapters is coupled to the portable audio device.

Abstract: A wearable device includes a body having fasteners and a frame coupled between two fasteners. The frame includes first and second sections. A first portion of the body includes the first section of the frame and one fastener and a second portion of the body includes the second section of the frame and the other fastener. A speaker and a microphone are connected to the first portion and another speaker and another microphone are connected to the second portion. The body also includes a processor, memory accessible to the processor, and programming in the memory for configuring the processor to selectively activate the speakers and microphones such that a first speaker emits an output sound signal while a first microphone and a second speaker are deactivated and a second microphone captures an input sound signal during the emission of the output sound signal by the first speaker.

Abstract: The present document describes a method (500) for providing combined audio and video content from a source device (210) to an audio sink device (230) and to a video sink device (220). The method (500) comprises determining (501) latency information regarding the video latency for processing the video content and the audio latency for processing the audio content of the combined audio and video content along the device chain (100) between the source device (210) and the audio and video sink devices (220, 230). Furthermore, the method (5009 comprises delaying (502) the audio content or the video content in dependence of the latency information, and providing (503) the combined audio and video content with the delayed audio content or the delayed video content.

Abstract: Various aspects include audio eyeglasses and methods for controlling audio eyeglasses. In some particular implementations, a method of controlling audio eyeglasses is disclosed. The method can include: detecting a reorient-and-hold gesture on the audio eyeglasses; initiating a timer in response to detecting the reorient-and-hold gesture; and in response to the timer exceeding a threshold period with the reorient-and-hold gesture maintained, powering off the audio eyeglasses.

Abstract: A headphone device includes a speaker housing, a first feedforward microphone, and a second feedforward microphone. The first feedforward microphone is coupled to the speaker housing at a first location, and the second feedforward microphone is coupled to the speaker housing at a second location. The headphone device also includes an active noise cancelling (ANC) circuit configured to generate an anti-noise signal based on at least one of a first signal from the first feedforward microphone and a second signal from the second feedforward microphone. The headphone device also includes a speaker configured to generate an audio output at least partially based on the anti-noise signal.

Abstract: A multi-channel switchmode audio amplifier is configured by a programmed processor such that each channel drives separate loads, is connected in parallel or is configured in a bridge-tied mode as well as combinations thereof. In one embodiment, amplifier channels that are connected in parallel have power amplifiers that are driven with signals from a single modulator. A feedback circuit and error amplifier from one channel controls the modulated signal that is applied to each parallely connected amplifier channel. Current feedback circuits for parallely connected amplifier channels are eliminated by tightly controlling the timing of switching in the power amplifier output stages.

Abstract: A portable electronic device includes several speakers spaced apart from one another on opposite sides of the device. An audio processor attenuates high frequency portions of a first audio signal and a second audio signal to provide a processed first audio signal and a processed second audio signal. An audio router directs the first audio signal to only a first speaker on a first side of the device, and directs the second audio signal to only a second speaker on a second side of the device. The audio signals may be directed according to an orientation of the device.

Abstract: A user interface device for an intelligent automated assistant service uses a plurality of audio data paths that can be selectively switched to operate in a privacy mode. There is provided a first audio data input path between the audio input subsystem and an internal buffer; a first audio data output path between the internal buffer and the first communications subsystem; a second audio data output path between the internal buffer and the second communications subsystem; and a first audio data bypass path between the audio input subsystem and the second communications subsystem. In a first state, the first audio data input path directs audio data to the internal buffer, and to the first and second audio data output paths. In a second state, the first audio data input path is terminated and audio data is directed to the second communications subsystem on the first audio data bypass path.

Abstract: The present disclosure provides a smart headphone. The smart headphone includes a sensor configured to sense external information, a memory configured to store feature information, and a controller operatively connected to the sensor and the memory, respectively, and the controller is configured to compare the external information sensed by the sensor with the feature information stored in the memory, and to control a playback state of audio information in the smart headphone according to the result of the comparison.

Abstract: In some embodiments, a method for providing feedback through wireless earpieces, may have one or more of the following steps: (a) detecting a position of the wireless earpieces in ears of a user utilizing a number of contacts, (b) analyzing how to modify communications with the user based on the position, (c) communicating with the user utilizing the analysis, (d) adjusting an orientation of one or more speakers of the wireless earpieces in response to the position, and (e) adjusting a plurality of sensors in response to the position.

Abstract: Disclosed is an artificial intelligence hub including: a main body having a speaker for outputting sound; a communication module for wirelessly communicating with a surround ding device; a base provided below the main body to support the main body; a cover coupled to a top of the main body, the cover having an upper surface for displaying a screen based on information exchanged via the communication module; and a grille having a vertically elongated cylindrical shape and provided with a plurality of through-holes therein, the main body being provided within the grille, the grille being coupled at an upper end thereof to the cover housing and coupled at a lower end thereof to the base.

Abstract: Systems, devices, and methods are described for providing loudspeaker protection and distortion suppression. An upstream loudspeaker model estimation component receives sensed electrical characteristics of a loudspeaker and generates an impedance model from which an excursion model of the loudspeaker and a gain change parameter may be generated. The impedance components are fitted to features of an estimated impedance, based on the sensed characteristics, to generate the estimated impedance model that is converted to an excursion model of the loudspeaker. A downstream audio signal processing component, based on the excursion model, or parameters thereof, limits a predicted excursion of the loudspeaker utilizing excursion-constraining processing circuitry that includes a non-linear constraint filter. Processed audio signals associated with the limited excursion are subject to distortion suppression prior to releasing the output audio signals for playback on the loudspeaker.

Abstract: A noise reducing device includes: an acoustic-to-electric conversion section for collecting noise and outputting an analog noise signal; an analog-to-digital conversion section for converting the analog noise signal into a digital noise signal; and a digital processing section for generating a digital noise reducing signal on a basis of the digital noise signal and a desired parameter. The device further includes: a retaining section for retaining a plurality of parameters corresponding to a plurality of kinds of noise characteristics; a setting section for setting one of the plurality of parameters as the desired parameter of the digital processing section; a digital-to-analog conversion section for converting the digital noise reducing signal into an analog noise reducing signal; and an electric-to-acoustic conversion section for outputting noise reducing sound on a basis of the analog noise reducing signal.

Abstract: An earmuffs system for noise reduction including an external microphone used in combination with active noise cancellation technology for the reduction of wind or other noises typically experienced while riding a vehicle such as a motorcycle, snow machine or ATV, the earmuffs system including a first earmuff including a first speaker and a first microphone therein; a second earmuff electrically coupled to the first ear muff, the second ear muff including a second speaker and a second microphone therein; noise cancellation circuitry for receiving first sounds from the first microphone and the second microphone and processing the first sounds by in part canceling the first sounds to form a first sound output that is provided from the first speaker and the second speaker; and a third microphone placed external to the first earmuff and to the second earmuff, the third microphone supplying second sounds for the first speaker and the second speaker to output as a second sound output without the second sounds underg

Abstract: Provided is a filter circuit for producing a noise reduction signal for reducing a noise signal collected by a microphone, including: a digital section including an analog/digital conversion section configured to convert the noise signal into a digital noise signal, a digital filter section configured to produce a digital noise reduction signal based on the digital noise signal, and a digital/analog conversion section configured to convert the digital noise reduction signal into an analog noise reduction signal; an analog path connected in parallel to said digital section and configured to output the noise signal as it is or after processed by an analog filter; and a synthesis section configured to synthesize the analog noise reduction signal outputted from said digital/analog conversion section of said digital section and the analog signal outputted from said analog path to produce a noise reduction signal to be used for noise reduction.

Abstract: Synchronized output of audio on a group of devices can comprise sending audio data from an audio distribution master device to one or more slave devices in the group. Scores can be assigned to respective audio playback devices, the scores being indicative of a performance level of the respective audio playback devices acting as a master device. The device with the highest score is designated as a candidate master device and one or more remaining devices are designated as a candidate slave(s). A throughput test is conducted with the highest scoring device acting as the candidate master device. The results of the throughput test are used to determine a master device for a group of devices. Latency of the throughput test can be reduced by using a prescribed time period for completion of the throughput test, and/or by selecting a first group configuration to passes the throughput test.

Abstract: A signal processing system and method is disclosed, applicable to environment providing voltage to Class-H driver. When using the signal processing system, the first is to detect the volume change of inputted voice and use the detection result as a power source to generate an expectation value for the circuit; the input end of the power generation circuit also adds a voltage offset in addition to the expectation value, so that the output voltage from the output end of the power generator provided to the Class-H driver is higher than a fixed value. The signal processing system and method of the present invention can adjust automatically and rapidly the output voltage signal for the power voltage provided to the Class-H driver by using negative feedback controller (such as, negative feedback loop, voltage offset and proportional integral differential (PID)) based on the detected volume change of inputted voice.

Abstract: A method for receiving broadcast radio signals in a vehicle, particularly in a motor vehicle, and a broadcast radio receiver that is set up to perform the method are described. The method involves multiple reception paths of a broadcast radio receiver being available in order to receive and computationally process broadcast radio signals separately from one another. In addition, the method involves multiple reproduction appliances being connectable to one or more respective reception paths in order to reproduce received broadcast radio signals, wherein multiple reception paths can be combined for a reproduction appliance in order to improve the reception quality. Provision is additionally made for the speed of the vehicle to be ascertained and for the number of reception paths that are combined for a reproduction appliance to be prescribed on the basis of the speed of the vehicle.

Abstract: In one aspect, an example method includes (i) making a determination of whether an external speaker is connected to a computing system via an audio communication interface; (ii) based on the determination, selecting an operational mode from among a first operational mode and a second operational mode, wherein (a) when the computing system operates in the first operational mode, the computing system disables output of the received audio content via the internal speaker and enables transmission of the received audio content via the audio communication interface for output by the external speaker, and (b) when the computing system operates in the second operational mode, the computing system disables output of the received audio content via the internal speaker and disables transmission of the received audio content via the audio communication interface for output by the external speaker; and (iii) causing the computing system to operate in the selected operational mode.

Abstract: A device for removing crosstalk includes a jack to form an electrical connection with a plug, and an audio unit to provide a left audio channel and a right audio channel to the plug. The audio unit includes a crosstalk cancellation circuit. The crosstalk cancellation circuit estimates the crosstalk between the left audio channel and the right audio channel to obtain an estimated right-to-left crosstalk and an estimated left-to-right crosstalk, and to remove the crosstalk by subtracting the estimated right-to-left crosstalk and the estimated left-to-right crosstalk from digital signals in the left audio channel and the right audio channel, respectively.

Abstract: In general, the subject matter described in this disclosure can be embodied in methods, systems, and computer-readable devices. An audio processing device plays a source audio signal with an electroacoustic transducer of a user earpiece, and records an aural signal that is sensed by same said electroacoustic transducer. The audio processing device determines values of one or more features of the aural signal that indicate a characteristic of a space in which the user earpiece is located. The audio processing device compares the determined values of the one or more features of the aural signal with pre-defined values of the one or more features. Based on a result of the comparing, the audio processing device determines whether the user earpiece is located at a user's ear.

Abstract: A portable loudspeaker with an enclosure that defines an acoustic cavity in an interior of the enclosure, at least one passive radiator exposed to the acoustic cavity, and an electro-acoustic transducer arranged to radiate sound pressure into the acoustic cavity to acoustically energize the at least one passive radiator. A user-operable switch is located in the interior of the enclosure, and a compliant button that forms part of the enclosure and overlies and is spaced from the switch. A sound-deadening member is positioned in the space between the button and the switch. The sound-deadening member is arranged to inhibit sound pressure in the acoustic cavity from reaching the button.

Abstract: A method and a device for analyzing and processing an abnormal load on a premises broadcasting device are provided. More particularly, a method for analyzing and processing an abnormal load on a loudspeaker including a distribution line connected to an output of an amplifier for the premises broadcasting device is provided. The method includes the steps of: comparing and analyzing a real-time individual load value with an individual load value at the early stage of abnormality analysis for an individual loudspeaker load; and electrically separating only the loudspeaker load, including the distribution line corresponding to a short, from the output of the amplifier for the premises broadcasting device in the comparison and analysis step.

Abstract: A portable electronic device includes at least four speakers spaced apart from one another. An audio processor attenuates a high frequency portion of a left audio signal and a right audio signal to provide a processed left audio signal and a processed right audio signal. An audio router directs the left audio signal to only a first speaker, the right audio signal to only a second speaker, the processed left audio signal to a third speaker, and the processed right audio signal to a fourth speaker. The audio signals may be directed according to the orientation of the device. The cutoff frequency for attenuating the high frequency portion of the audio signals may be responsive to the orientation of the device. In other embodiments, the high frequency portion of the audio signals may be decorrelated to produce signals with high frequency portions for all speakers.

Abstract: Embodiments are directed processing adaptive audio content by determining an audio type as one of channel-based audio and object-based audio for each audio segment of an adaptive audio bitstream, tagging the each audio segment with a metadata definition indicating the audio type of the corresponding audio segment, processing audio segments tagged as channel-based audio in a channel audio renderer component, and processing audio segments tagged as object-based audio in an object audio renderer component that is distinct from the channel audio renderer component. Object-based audio is rendered through an object audio renderer interface that dynamically adjusts processing block sizes of the object audio segments based on timing and alignment of metadata updates and maximum/minimum block size parameters.

Abstract: The present invention is directed to an interactive image device and interactive method thereof for a traditional photo frame or a fameless painting, the device comprises a frame body provided with a fastening position, a display surface for display an image, an effect unit for generate effects, a trigger unit and a circuit module to enable or disable the effect unit in responding the operation of the trigger unit by a user. The user is able to get different interactive effect feedbacks by inserting the trigger unit to the fastening position each time, thus the present invention can easily integrate the displayed image with interactive effects and interact with users by novel operating methods.

Abstract: A system calibrates one or more head-related transfer functions (HRTFs) for a user. An indicator is presented on a head-mounted display, where the indicator prompts the user to turn the user's head to view the indicator and effectively change the user's head orientation. The head orientation corresponds to positions of both ears, thus a position of the indicator prompting to change the user's head orientation is associated with corresponding positions of both ears. Responsive to the indicator being viewed by the user, a sound source at a fixed position transmits a test sound and the test sound is received at microphones coupled to the user's ears. By analyzing the test sound received at the microphones, a unique HRTF associated with a relative position between the sound source and each ear can be obtained.

Abstract: An emergency communication system that is capable of broadcasting a live message to a specific zone of a protected structure, recording the live transmission, and repeating the recorded message to the same protected zone. In certain embodiments configured to protect multiple zones, the system further permits broadcast of a second live message to another zone of the structure, recording the second live broadcast, and repeating the second recorded message in the same zone to which the message was broadcast live. The system includes hardware such as a processing element and speaker assemblies and a computer program for instructing the processing element to carry out the transmission, recording, and re-broadcasting of messages through the speaker assemblies.

Abstract: Provided herein is an audio processing apparatus including: a controller configured to determine an initialization mode for processing video and audio signals provided from an audio provision apparatus of among a plurality of initialization modes, and to perform an initialization process differently according to the result of determination; and an audio processor configured to process the audio signal and output the processed audio signal, when the initialization process is performed.

Abstract: In one aspect, a device includes a processor and storage accessible to the processor. The storage bears instructions executable by the processor to, based on input received from a sensor, control a first audio output per at least a first setting for a left ear of a user. The instructions are also executable by the processor to, based on input received from a sensor, control a second audio output per at least a second setting for a right ear of the user.

Abstract: A hearing apparatus includes a first hearing device and a second hearing device. The first hearing device is configured to block a transmission path of a first digital signal, based on a posture of a user wearing the first hearing device and the second hearing device, the first digital signal being based on a first audio signal. The second hearing device is configured to wirelessly transmit a second digital signal to the first hearing device, based on the posture of the user, the second digital signal being based on a second audio signal.

Abstract: An improved implantable auditory stimulation system includes two or more implanted microphones for transcutaneous detection of acoustic signals. Each of the implanted microphones provides an output signal. The microphone output signals may be combinatively utilized by an implanted processor to generate a signal for driving an implanted auditory stimulation device. The implanted microphones may be located at offset subcutaneous locations and/or may be provided with different design sensitivities, wherein combinative processing of the microphone output signals may yield an improved drive signal. In one embodiment, the microphone signal may be processed for beamforming and/or directionality purposes.

Abstract: A set of headphones have microphones generating left and right feed-forward and feedback signals. A processor filters the feed-forward signals to provide ambient naturalness to the signals and generate binaural ambient signals, filters the feedback signals to generate noise-cancelling signals, and combines the noise-cancelling signals and the binaural ambient signals to generate output signals for an output transducer. A transmitter transmits the binaural ambient signals. Another set of headphones have microphones generating left and right feed-forward and feedback signals and a receiver configured to receive binaural signals.

Abstract: A telephone and an audio control method thereof are provided. The telephone includes a connector, a detecting circuit and an audio control unit. The connector connects an audio transceiver. The detecting circuit couples the connector, and generates a detecting voltage by detecting the audio transceiver through the connector. The audio controlling unit couples the detecting circuit and the connector. The audio control unit includes an analog-to-digital converter, an audio codec and a processing unit. The analog-to-digital converter is configured to covert the detecting voltage into a digital code. The audio codec provides at least two audio configurations. The processing unit identifies the audio transceiver according to the digital code, and controls the audio codec to switch to the audio configuration adapted to the identified audio transceiver to process audio data of the audio transceiver.

Abstract: A convertible headphone system with headphones having a transducer with a front and a rear, and a back cavity that is fluidly coupled to the rear of the transducer, and an external acoustic structure that defines an acoustic volume. The headphones and the external acoustic structure are configured to be coupled together so as to fluidly couple the back cavity of the headphones to the acoustic volume of the external acoustic structure, to form an expanded back cavity volume.

Abstract: An A/V receiving apparatus is disclosed. The A/V receiving apparatus includes a first interface connected to a display apparatus, a second interface connected to an audio signal output apparatus, and a controller configured to, when a video signal and an audio signal are received, transmit an audio signal return request to the display apparatus along with the video signal and the audio signal, when the audio signal is returned from the display apparatus, calculate an output time difference of the video signal and the audio signal based on a return timing of the audio signal, delay the audio signal according to the output time difference and transmit the audio signal to the audio signal output apparatus.

Abstract: A sound accessory device is provided. A receiving unit of the sound accessory device receives a first sound from a first external device. A sound output unit outputs a first sound. A sensing unit senses a second sound for triggering an output control of the first sound from outside. A control unit controls the output of the first sound, if the second sound is received. The sound for triggering the output control of the first sound includes at least any one selected from a specific word, a voiceprint representing a speech of a specific person, a horn of a vehicle, an alarm sound, a notification sound of an external device, a sound of an animal, and a doorbell sound.

Abstract: The present invention relates to a cable (physical) tethering of a two computer related devices that are not specifically designed to communicate with each other, and, more particularly, to a man-portable and ruggedized physical tether device with hardware and software components for physical tethering and effectuation of data exchange (and subsequent processing of the exchanged data) between, e.g., a data visualization/mobile device and a network data collection device/equipment, without the need to retrofit/redesign any aspect of the visualization/mobile device or the a network collection device/equipment to accomplish the data exchange and subsequent processing of the exchanged data.

Abstract: A combo-jack detecting circuit for used in an audio CODEC is provided. The combo-jack detecting circuit comprises a low pass filter, a detecting unit and a switch unit. Without coupling capacitor between an audio apparatus and audio codec, the output direct current voltage of the audio apparatus can be provided by the low pass filter. The switch unit is configured to switch selectively for outputting two voltage signals to the low pass filter sequentially. The low pass filter provides two direct current signals so that the detecting unit determines a jack type of the sounding signal apparatus accordingly. By means of proper design, input buffers in the audio codec can transform a common mode voltage of the audio apparatus into a common mode voltage of the audio codec.

Abstract: A product packaging comprises circuitry and a speaker that are operable to detect when the product packaging is opened and/or removed from the packaging, and in response to detecting the removal and/or opening, play one or more pre-loaded audio messages via the speaker. The pre-loaded audio message includes a welcome message and/or setup instructions, which may be interactive. The circuitry and/or the speaker generates an interactive audio dialog that is utilized to customize setup of the product (e.g., a gaming headset), and may receive corresponding audio responses from a user of the gaming headset, in response to one or more audio prompts for the interactive audio dialog. The circuitry and/or the speaker may select settings for the gaming headset based on the received corresponding audio responses. The circuitry and/or the speaker may configure the gaming headset based on the selected settings and generate an audio summary of the selected settings.

Abstract: A jack for preventing a headphone from inputting double audio sources includes: an audio jack set including a left audio jack and a right audio jack, which are respectively provided on bottoms of a left earpiece and a right earpiece of a headphone and for connecting an audio connector. The left audio jack includes a first common grounding contact, a first conductive terminal and a second conductive terminal. The right audio jack includes a second common grounding contact, a third conductive terminal and a fourth conductive terminal. Two audio jacks are provided for users to select. Simple mechanical switches are additionally provided, which only allow one inputted audio signal to input to a left earpiece and a right earpiece of the headphone for playing audio, and thus are capable of preventing users from inputting two different audio sources to the headphone simultaneously.

Abstract: Described herein are methods and devices that use magnetometer in a hearing aid for measuring a magnetic field. The magnetometer may be a high-sensitivity triaxial magnetometer that detects the magnetic field in three orthogonally oriented directions. Such a magnetometer may be placed in the hearing aid without restriction as to location or orientation. The measured magnetic field may be used for telecoil switching when the presence of a magnetic field produced by a speaker or other source is detected. The measured magnetic field may also be used for magnetic mapping of the environment and motion detection.

Abstract: An audio playback system includes an earphone and an audio device. The earphone includes a first earphone body, a second earphone body, a first sensing unit mounted in the first earphone body, a second sensing unit mounted in the second earphone body, a first plug, and a second plug electronically connected to the first sensing unit and the second sensing unit. The audio device includes a first jack, a second jack configured to receive the second plug, and a control unit. The first sensing unit and the second sensing unit output sensing signals which indicate whether the earphone is used. The control unit receives the sensing signals from the second jack and controls a working state of the audio device.

Abstract: Systems and methods are provided that may implement independent and control-isolated audio processing (ICIAP) to separate and/or control audio streams at multiple levels of sensitivity and/or security. The disclosed systems and methods may be implemented in one example using separate real time digital audio processing and mixing hardware “channels” for each audio stream that are provided within an ICIAP connection system that includes at least one ICIAP audio processing device and a separate control processor, while at the same time incorporating a comprehensive set of interlocks to ensure the separation of audio data streams from one another and from control information, and to ensure authorization in real time for each different audio stream.

Abstract: A method includes detecting insertion of a headphone into an electronic device, comparing a voltage level detected by a detection circuit of the electronic device to a set of threshold voltages to determine a type of the headphone, determining the headphone to be a first type when a first signal travels through the first path to ground, and determining the headphone to be a second type when a second signal travels through the second path to charge the bias capacitor to a reference voltage. The detection circuit includes a first path, a second path, and a bias capacitor.

Abstract: A method and system are provided for determining a magnetic field using a mobile device. The method includes determining location information of the mobile device, obtaining magnetic field data based on the location information, determining orientation information of the mobile device and applying the orientation information to the magnetic field data to compute a magnetic field corresponding to the orientation of the mobile device.

Abstract: An audio processing section generates at least a left-front audio signal, a right-front audio signal, a second left audio signal that is the same as a left-front audio signal, and a second right audio signal that is the same as the right-front audio signal based on a left-front audio signal and a right-front audio signal supplied from an audio selector, and outputs these signals to a main output terminal, and supplies the second left audio signal and the second right audio signal also to a switch section. When a first mode is selected, the switch section selects the audio signal from the audio processing section, and supplies it to a ZONE2 output terminal. On the other hand, when modes other than the first mode are selected, the switch section selects an audio signal from the audio selector, and supplies the selected audio signal to the ZONE2 output terminal.