|| List of recent Audio Signals-related patents
|Audio driver user interface|
A method for an audio driver user interface comprising: capturing at least two audio signals (1 1, 14, 101); determining a trajectory of an audio source from the at least two audio signals (103); and generating a user interface input dependent on the trajectory of the audio source (105).. .
|Wireless device pairing|
A wireless communication network includes a communication source device, such as a bluetooth digital music player and a communication destination device, such as a bluetooth headphone or speaker device. The communication source device is configured to transmit audio signals, such as encoded electrical signals in the audio frequency band, to the communication destination device via a wireless or wired audio communication channel.
|Eardrum supported nanomembrane transducer|
A flexible membrane of piezoelectric material sized to be supported by and to conform to the eardrum. Electrodes on the membrane allow the membrane to function as an audio transducer stimulating the eardrum with an audio signal or detecting audio signals at the eardrum.
|Altering audio signals|
A system of altering an audio signal presented to a user may include an input configured to receive data indicating a status of an environment outside of an audio device, where the audio device is configured to present an audio signal to a user. The system may also include a detection unit configured to detect a condition based on the received data and an audio altering unit configured to direct altering of the audio signal presented to the user based on the detection of the condition..
|Multifunctional led device and multifunctional led wireless conference system|
Multifunctional led devices and multifunctional led wireless conference systems are provided. A multifunctional led device includes led light source assembly, led drive and power supply unit, controller unit, audio power amplifier unit, microphone module, wireless transceiver module, speaker unit, and/or audio codec unit.
|System and method for personalization of an audio equalizer|
The invention is directed to synthesizing a personalized audio equalization filter based on an individual's hearing profile when listening to audio signals using a preferred electronic means of transduction and production of the audio signals through headphones, earphones, or loudspeakers and is presented in two steps. In the first step, the deviation of the listener's hearing profile, when the preferred listening device is donned, is measured and recorded relative to predetermined equal-loudness contours (e.g., iso standard equal-loudness contours).
|Method and circuitry for processing audio signals|
An audio signal processing method and circuitry that processes an input audio signal by filtering the input audio signal with a high pass filter to produce a filtered audio signal, which is input to a compressor. A first intermediate audio signal is produced based on the compressor output signal.
|System and method for automatically switching operational modes in a bluetooth earphone|
Disclosed is a system and method for automatically switching operational modes in a bluetooth earphone. The system includes a first sensor, and a second sensor disposed within left speaker and right speaker of the earphone to detect an earphone in-use situation, and an earphone unused situation, a built-in bluetooth chip electronically configured in the body of the earphone to receive an earphone in-use signal, and an earphone unused signal from the first sensor, and the second sensor, and an electrical switching circuit in communication with the bluetooth chip to enable smooth transition of the earphone between a first operational mode, and a second operational mode, wherein, in the first operational mode, the earphone transmits and receives wireless bluetooth signals to and from an external bluetooth enabled communication device and plays audio signals, and in the second operational mode, the earphone plays no audio signals until the first sensor and the second sensor further detects the earphone in-use situation..
|Orientation free handsfree device|
Methods, apparatuses, and computer program products are provided to indicate or automatically configure headphone channel orientation based on a physical orientation determination. An apparatus is provided that is configured to at least determine an orientation of the headphone device; analyze the determined orientation; and provide an indication of the determined orientation or adjust the output channel configuration of the apparatus for the headphone device.
|Media detection and packet distribution in a multipoint conference|
A method includes receiving a plurality of audio signals. Each of the plurality of audio signals includes audio packets, wherein one or more audio packets from each of the plurality of audio signals is coded with an audiometric, the audiometric including an acoustic measurement from a conference site.
|Method and apparatus for communicating with audio signals having corresponding spatial characteristics|
A method, apparatus computer program product are provided to facilitate the utilization of the spatial position of audio signals in order to improve voice quality. In the context of a method, a main mono signal is determined from one or more audio signals that were received.
|Controlling an electronic conference based on detection of intended versus unintended sound|
A technique manages an electronic conference. The technique involves receiving a set of audio signals from a set of participants of the electronic conference, each audio signal being received from a respective participant.
|Methods, apparatuses, and computer program products for providing broadband audio signals associated with navigation instructions|
Methods, apparatuses, and computer program products are herein provided for providing broadband audio signal navigation instructions. A method may include determining a broadband audio signal associated with at least one navigation instruction.
|Compensation current optimization for cochlear implant systems|
An exemplary system includes a sound processor configured to process one or more audio signals and an implantable cochlear stimulator configured to apply stimulation representative of the one or more audio signals to a patient via a plurality of electrodes. In some embodiments, the sound processor directs the implantable cochlear stimulator to 1) apply a main current to a first electrode included in the plurality of electrodes and associated with a first pitch, 2) concurrently apply, during the application of the main current, a compensation current to a second electrode included in the plurality of electrodes and associated with a second pitch that is lower than the first pitch, and 3) adjust the compensation current to result in a target pitch being presented to the patient, the target pitch being higher than the first pitch..
|Wirelessly charged electronic device with shared inductor circuitry|
An electronic device may contain an input-output device such as a speaker, vibrator, or near field communications antenna. The input-output device may include an inductor.
|Robust estimation of sound source localization|
A method for sound source localization in a digital system having at least two audio capture devices is provided that includes receiving audio signals from the two audio capture devices, computing a signal-to-noise ratio (snr) for each frequency band of a plurality of frequency bands in a processing frame of the audio signals, determining a frequency band weight for each frequency band of the plurality of frequency bands based on the snr computed for the frequency band, computing an estimated time delay of arrival (tdoa) of sound for the processing frame using the frequency band weights, and converting the estimated tdoa to an angle representing sound direction.. .
|Method of retrieving processing properties and audio processing system|
Techniques for storing and retrieving processing properties for processing an audio signal in an audio processing system, such as, an audio mixing console are provided. The processing properties specify audio effects and/or audio mixing applied to the audio signal.
|Systems and methods for gathering research data|
Methods and systems are provided for gathering research data that includes information pertaining to audio signals received on a portable device, such as a cell phone. Frequency domain data is received or produced, a signature is extracted from the frequency domain data and an ancillary code is read from the frequency domain data..
|Wireless sound transmission system and method|
A method for providing sound to at least one user, in which audio signals are captured and transformed into audio data that is transmitted to at least one receiver unit; audio signals are generated from the received audio data and the hearing of the user(s) stimulated thereby; wherein the audio data is transmitted as audio data packets in separate slots of a tdma frame structure, wherein the transmission unit and the receiver unit(s) are synchronized to form a wireless network, wherein each tdma frame structure has at least one listening slot during which the synchronized network members do not transmit data and at least one network members listens, and wherein control data is transmitted from an external control device according to a sequence pattern selected according to the duration and periodicity of the listening slot(s) to be received by the at least one synchronized network member during said listening slot(s).. .
|Eye fixation system and method|
An eye fixation system for attention-attracting fixation of a user's eye includes an audio system configured to play sound based on audio signals to be audible to a user so as to attract the user's attention, and a target display system configured to communicate with the audio system to receive the audio signals and to display an optical target to be viewed by the user. The target display system includes an optical modulator configured to modulate the optical target based on the audio signals.
|Apparatus and method for providing messages in a social network|
A system that incorporates teachings of the present disclosure may include, for example, a server including a controller to receive audio signals and content identification information from a media processor, generate text representing a voice message based on the audio signals, determine an identity of media content based on the content identification information, generate an enhanced message having text and additional content where the additional content is obtained by the controller based on the identity of the media content, and transmit the enhanced message to the media processor for presentation on the display device, where the enhanced message is accessible by one or more communication devices that are associated with a social network and remote from the media processor. Other embodiments are disclosed..
|Motor vehicle noise management|
A device and method that is configured to control the operation of a motor vehicle cabin active sound management (asm) system that uses an asm controller to control operation of one or more sound transducers that transmit audio signals in the cabin so as to alter vehicle powertrain-related sounds in the cabin, wherein the motor vehicle further comprises a mobile telephone system that is configured to receive incoming mobile telephone calls and transmit outgoing mobile telephone calls. The device can include a controller that is configured to receive from the mobile telephone system an indication that a mobile telephone call is incoming or an outgoing call is being initiated.
|Apparatus and method for encoding/decoding signal|
An encoding method and apparatus and a decoding method and apparatus are provided. The decoding method includes skipping extension information included in an input bitstream, extracting a three-dimensional (3d) down-mix signal and spatial information from the input bitstream, removing 3d effects from the 3d down-mix signal by performing a 3d rendering operation on the 3d down-mix signal, and generating a multi-channel signal using a down-mix signal obtained by the removal and the spatial information.
|Data-driven media management within an electronic device|
A method and apparatus for intelligently routing and managing audio signals within an electronic device is disclosed. The routing is responsive to a set of logical and physical policies which are stored in data tables which can be updated as needed..
There is provided a wireless transmission system comprising at least one mobile transmitter for wireless audio transmission having a user interface. The wireless audio transmission system further has a stationary receiver for receiving the wireless audio transmission from the at least one mobile transmitter.
|Wireless speaker with parabolic reflectors|
Described herein is an acoustic device including a speaker device adapted to wirelessly connect to, and relay audio signals from, an audio source. An external acoustic reflector is adapted to receive the speaker device inside or on the external acoustic reflector.
|User voice location estimation for adjusting portable device beamforming settings|
An audio device may use the audio detected at two opposite facing, front and rear omnidirectional microphones to determine the angular directional location of a user's voice while the device in speaker mode or audio command input mode. The angular directional location may be determined to be at front, side and rear locations of the device during the period of time by calculating an energy ratio of audio signals output by the front and rear microphones during the period.
|On-request wireless audio data streaming|
An on-request wireless audio data streaming system is configured for providing on-request wireless audio data streaming to one or more wireless device apps on one or more wireless devices. The system comprises a directory server, audio capture interfaces and a wireless interface.
|Method for processing an audio signal, audio playback system, and processing unit for processing audio signals|
Method of processing an audio signal, audio reproduction system, and processing unit for conditioning audio signals. The audio signal includes at least first and second channels, the first channel being time-delayed by a predetermined delay factor, and a volume level of the first channel being attenuated by a predetermined attenuation factor.
|Remote control toy car with wireless real-time transmission of audio and video signals|
This invention discloses a remote control toy car wirelessly communicable with a client terminal and configured to support wireless real-time transmission of video and audio signals. The toy car comprises a microprocessor, a clock generation circuit, a program memory, a random access memory, a power conversion circuit, a power supply module, a video capturing circuit, an audio circuit and a radio transceiving circuit.
|Wireless dj controller with accelerometers|
A wireless dj controller includes an accelerometer, a control button, and a wireless transceiver. The wireless dj controller detects when the control button has been depressed and accesses an output value from the accelerometer.
|Method and apparatus for wireless digital radio|
A method and apparatus are provided for a first controlled device, such as a wireless local transmitter that accepts a plurality of digital audio signals and corresponding program information signals converted from a controlled source, such as the encoded digital data provided by a digital data signal source, typically a community antenna television (catv) cable or direct broadcast satellite, then modulates said digital audio and corresponding program information signals on different carrier frequencies and transmits the modulated signals to a plurality of second controlled devices, such as remote digital receiver/tuners that demodulate said signals to output music in stereophonic sound and display the corresponding program information by means of an alphanumeric display. The first and second controlled devices contain microprocessor systems for communicating, controlling, storing, processing, and display of digital data within the operation of the respective system.
|Method for reproducing music file of mobile communication terminal and mobile terminal implementing the same|
A mobile communication terminal is provided including an audio processing unit, a speaker, a connecting unit that connects to an external audio output device and indicates whether the external audio output device is connected, and a control unit configured to, while in a silent mode, control the audio processing unit to reproduce a music file and to output audio signals, corresponding to the reproduced music file, through the speaker, the silent mode being a mode wherein a vibration signal is generated upon receiving an incoming call, if the external audio output device is connected to the connecting unit, output the audio signals to the external audio output device, and if the external audio output device is disconnected from the connecting unit while the audio signals are being output to the external audio output device, control the display unit to display a user interface for continuing reproduction of the music file.. .
|Enhanced signaling for mobile communication devices|
A data communication system routes calls from a mobile communication device associated with a calling party to a mobile communication device associated with a called party. If calls are not answered by the called party, a call is routed to a voicemail server.
|Audio output device|
Provided is an audio output device capable of preventing noises and improving the s/n ratio even if no audio signal is inputted in the middle of the input of audio signals, or even if an audio-signal input state and a no-signal state are alternately repeated. In the provided audio output device, a multiplier is provided on the input side of each of the delayers.
|Headphone system for earbud speakers|
The present invention relates to a personal headphone device, system and method configured to combine a headphone and earbud into one acoustical product. The headphone earbud device is configured with an adaptive attachment for controlling the audio signals and/or device providing the audio signals.
|Loudness modification of multichannel audio signals|
Scaling, by a desired amount sm, the overall perceived loudness lm of a multichannel audio signal, wherein perceived loudness is a nonlinear function of signal power p, by scaling the perceived loudness of each individual channel lc by an amount substantially equal to the desired amount of scaling of the overall perceived loudness of all channels sm, subject to accuracy in calculations and the desired accuracy of the overall perceived loudness scaling sm. The perceived loudness of each individual channel may be scaled by changing the gain of each individual channel, wherein gain is a scaling of a channel's power.
|Aerially moved payload having a digital microphone and digital microphone control system|
An aerially moved payload system having a platform, at least one line, reel, and motor combination for moving the platform, at least one digital microphone, image generating device, and multiplexer are attached to the platform, wherein the multiplexer is capable of embedding any audio signals captured by the a least one digital microphone into any images generated by the at least one image generating device for transmission from the platform to a remotely located control center.. .
|System, device, and method for establishing a microphone array using computing devices|
A system, device, and method for generating an audio output includes a master computing device and a plurality of client computing devices. Each client computing device includes a microphone to record audio signals.
|Necklace-style wireless audio headset|
A wireless audio headset configured to be worn as a pendant necklace, with wireless receiver, audio amplifier, controls, display and power source built into the pendant, the pendant suspended about the user's neck by wires that carry audio signals from the pendant to in-ear drivers; the pendant further containing storage compartments for storing the earphones when not in use.. .
|Adaptive noise reduction using level cues|
A system utilizing two pairs of microphones for noise suppression. Primary and secondary microphones may be positioned closely spaced to each other to provide acoustic signals used to achieve noise cancellation/suppression.
|In-vehicle audio device|
In a structure of an in-vehicle audio device, the audio system has an audio signal supplying section, an audio signal processing section, a balance adjustment section and an audio signal output section. A right audio signal processing section and a left audio signal processing section in the audio signal processing section perform a process of filtering audio signals supplied from the audio signal supplying section on the basis of a transfer function.
|Headset with auxiliary input(s) for cell phone and/or other devices|
An active-noise-reduction (anr) headset includes at least one auxiliary connection to an output of at least one device, such as a personal communications, computing, and/or entertainment device. An exemplary headset also includes a primary connection to a two-way radio or public-address system and circuitry for automatically suppressing or muting the volume of an auxiliary input signal relative to that of a primary input signal.
|Determining room dimensions and a relative layout using audio signals and motion detection|
Methods and apparatus are provided for determining room dimensions and layout. A method includes receiving an audio signal from at least one other detection apparatus.
|System, sound processing apparatus and sound processing method for electronic games|
A system, a sound processing method and a sound processing apparatus suitable for enhancing gamer experience for electronic games. The sound processing apparatus can communicate with a terminal suitable for playing an electronic game.
The present invention relates to a glove comprising a transceiver module for operationally connecting to at least a second device, and further comprising at least a speaker and at least a microphone that are operationally connected to the transceiver module to transmit and to receive audio signals, in particular voice signals, exchanged with the second device; the glove further comprises at least one vibrating element operationally connected to the transceiver module, wherein the transceiver module is configured to generate an activation signal upon receiving an operating request from the second device, and wherein the vibrating element performs at least one mechanical vibration in response to the activation signal.. .
|Portable audio device and housing|
A portable audio device has a gate member that is spring activated to allow for attachment to other articles. The spring-activated gate member is integrated within the portable audio device.
|Integrated audio-visual systems|
Integrated audio-visual systems are provided. Such integrated audio-visual systems are capable of reproducing sound frequencies without compromising visual characteristics.
|Ear bud retraction module having optimal microphone placement|
A retractable ear bud module has a housing with an ear bud cable retractable mounted in the housing. The ear bud cable has at least one ear bud and a microphone, and a fixed end attached to a circuit board including a wireless receiver mounted.
|Noise cancelling headphone|
A noise cancelling headphone includes a headphone body, a audio player and a central processing unit. The headphone body includes a headband, a first speaker unit and a second speaker unit.
|System for fitting audio signals for in-use ear|
A system and method are provided for automatic fitting of all audio signals according to the ear in which a user is using to receive audio signals from a host device. The device may comprise an inquirer configured to query a host device for an in-use audio producing transducer; an electronic mechanism configured to identify an ear which a user is using to receive audio signals from a host device, based on the in-use audio producing transducer; and a notifier configured to instruct the host device, based on the identified ear, to output a channel of audio signals to the in-use audio producing transducer.
|Power consumption in motion-capture systems with audio and optical signals|
The technology disclosed provides systems and methods for reducing the overall power consumption of an optical motion-capture system without compromising the quality of motion capture and tracking. In implementations, this is accomplished by operating the motion-detecting cameras and associated image-processing hardware in a low-power mode (e.g., at a low frame rate or in a standby or sleep mode) unless and until touch gestures of an object such as a tap, sequence of taps, or swiping motions are performed with a surface proximate to the cameras.
|Object detection and tracking with audio and optical signals|
The technology disclosed addresses these problems by supplementing optical gesture recognition with the ability to recognize touch gestures. This capability allows the user to execute intuitive gestures involving contact with a surface.
|Electronic device and method for adjusting display screen|
In a method for adjusting a display screen of an electronic device, the method receives analog audio signals of a user, transforms the analog audio signals to digital audio signals, detects a first control command including first rotation directions and first rotation angles of the display screen from the digital audio signals, and rotates the display screen according to the first rotation directions and the first rotation angles. The method further obtains second rotation angles of the display screen detected by a gravity sensor of the electronic device, and stops rotating the display screen when the second rotation angles are equal to the first rotation angles..
|Messaging by writing an image into a spectrogram|
A message is communicated between devices by passing a host signal, such as an audio signal, with the message written into the spectrogram of the host signal. For host audio signals, the message is authored, converted to an image format (if not already in suitable image form) and written into the spectrogram of the audio signal.
|Ear bud retraction mechanism having a break away dust door|
A retractable ear bud module, comprising: a housing having a cover and a door with a hinge for removably attaching the door to the cover; the cover includes a side defining a curved depression for removably holding the hinge; a retraction mechanism including a rotatable spool having an axis, and an ear bud cable mounted in the housing, the retraction mechanism selectively retracts or dispenses the ear bud cable; at least one ear bud attached to the ear bud cable; a wireless receiver for receiving audio signals, the wireless receiver being in electronic communication with the ear bud cable to communicate audio signals to at least one ear bud.. .
|Method for generating a surround audio signal from a mono/stereo audio signal|
Disclosed is a method for generating a surround-channel audio signal (mout) from a mono/stereo audio signal (min, sin), comprising the steps of: a) generating a first multi-channel signal (m1) by surround panning the mono/stereo audio signal (sin); b) generating a second multi-channel signal (m2) by effect processing the mono/stereo input signal (min, sin) so that the rear signals comprise at least reverberation of the mono/stereo audio signals; and c) mixing the corresponding signals of the first multi-channel signal (m1) and the second multi-channel signal (m2), thereby forming the surround-channel audio signal (mout).. .
|System and method for variable decorrelation of audio signals|
Various embodiments relate to a system and method for decorrelating an audio signal with a hybrid filter. The hybrid filter is generated by first generating a decorrelation filter.
|Object-based 3-dimensional audio service system using preset audio scenes|
Provided are an object-based three dimensional (3-d) audio service system using preset audio scenes and a method thereof. The system and the method are suggested for enabling a user to easily and conveniently watch and listen an object based 3-d audio service by eliminating inconvenience that requires a user to control each of object audio signals of sound sources.
|Alarm device for banishment of birds and animals|
This utility model releases an alarm device for banishment of birds and animals, which includes: radio transmission module, voltage stabilizing circuit and inverter circuit. The radio transmission module sends radio signals to radio receiver module which then transmits such radio signals to the pc control circuit; the said pc control circuit sends instruction signals to the audio circuit which then transmits the audio signal to amplification circuit which outputs the amplified audio signals; the said voltage stabilizing circuit provides 5v power supply to the said radio transmission module, radio receiver module, the said pc control circuit and the said audio circuit, while the said inverter circuit provides +/−35v power supply to the said amplification circuit.
|Electronic device to align audio flow|
An electronic device is provided that includes an input device to provide first audio signals, an output device to receive second audio signals, and logic to receive the first audio signals and to provide an audio input flow. The logic to further receive an audio output flow and to provide the second audio signals to the output device based on the audio output flow.
|Recording and retrieval of sound data in a hearing prosthesis|
A hearing prosthesis for delivering stimuli to a hearing-impaired recipient is disclosed, the hearing prosthesis comprising: a sound transducer for converting received sound signals into electric audio signals; a sound processor for converting said electric audio signals into stimuli signals; a stimulator for delivering said stimuli to the recipient; a memory for storing data representative of sound signals; and a controller configured to cause selected sound data to be retrieved from said memory and processed by said sound processor.. .
|System and method for digital signal processing|
The present invention provides methods and systems for digitally processing audio signals in broadcasting and/or transmission applications. In particular, the present invention includes a pre-transmission processing module which is structured and configured to generate a partially processed signal.
|Method, apparatus, and computer program product for categorical spatial analysis-synthesis on spectrum of multichannel audio signals|
A method, apparatus and computer program product are therefore provided according to an example embodiment of the present invention in order to perform categorical analysis and synthesis of a multichannel signal to synthesize binaural signals and extract, separate, and manipulate components within the audio scene of the multichannel signal that were captured through multichannel audio means. In the context of a method, a multichannel signal is received.
|Method and apparatus for the secure storage of audio signals|
In one embodiment, a method, system and apparatus for recording audio is provided so that the recording can be authenticated. The system may be implemented as a central server that is accessed via one or more lines for audio communication, or as a stand-alone unit.
|Modem with expansion module|
A modem with an expansion module includes a modulation/demodulation module and the expansion module. The modulation/demodulation module is provided to execute modulation and demodulation operations to network signals.
|Expansion apparatus with network module|
An expansion apparatus with a network module mainly has a circuit board, and a signal output port, a central processing unit, a memory unit, and a network module which are electrically connected on the circuit board. The memory unit stores an operating system, and the operating system is executed by the central processing unit after the expansion apparatus is started up.
|System and method for surgical telementoring and training with virtualized telestration and haptic holograms, including metadata tagging, encapsulation and saving multi-modal streaming medical imagery together with multi-dimensional [4-d] virtual mesh and multi-sensory annotation in standard file formats used for digital imaging and communications in medicine (dicom)|
The invention relates generally to a medical apparatus and method of using the same for receiving and transmitting streaming medical imagery and audio signals in real time, and allowing remote operators to annotate and telestrate with same. The invention acquires streaming medical imagery and audio signals through a telestreamer input device, allowing users to electronically collaborate, generally by telestrating, annotating, and sketching image overlays on streaming medical imagery.
|Self-learning hearing assistance system and method of operating the same|
A method of operating a system for providing hearing assistance involves capturing audio signals by a manually controlled transmission unit having a user interface and default values setting transmission unit operating parameter storage, and transmitting audio signals from the transmission unit to a receiver unit, the audio signals being processed in the receiver unit and/or in the transmission unit; stimulating the user's hearing according to the audio signals from the receiver unit; logging user preference data by recording data concerning the manual operation of the user interface of the transmission unit and by recording data concerning the respective use situation of the transmission unit; evaluating, in the transmission unit, the logged user preference data to extract user preferences concerning use of the transmission unit; and adjusting, in the transmission unit, the stored default values of the at least one operating parameter setting according to said extracted user preferences.. .
|Direction of arrival estimation using watermarked audio signals and microphone arrays|
An apparatus for providing direction information based on a reproduced audio signal with an embedded watermark includes a signal processor, which is adapted to process at least two received watermarked audio signals recorded by at least two audio receivers at different spatial positions. The signal processor is adapted to process the received watermarked audio signals to obtain a receiver-specific information for each received watermarked audio signal.
|Secured audio channel for voice communication|
A security device for hindering data theft and data leaks via audio channel of a computer system is based on passing the audio signals through a coding vocoder that receives input audio signal from a computer and compressing the signal to a low bit-rate digital data indicative of human speech; and a decoding vocoder that decompress the digital data back to a secure audio signal. The data transfer of the protected audio channel is intentionally limited not to exceed the bit-rate needed to carry vocoder-compressed human speech which is well below the capabilities of unprotected audio channel.