Abstract: Methods and apparatus are disclosed for dynamically selecting the number of audio channels to mix per listener in an audio processor, such as a server-based three-dimensional audio mixer, as a function of any reasonable measurement of the load on the audio processor.

Abstract: The present invention relates to an apparatus and method for redeeming otherwise closed and concealed information contained in audio signals. An active circuit balances the ratio between in-phase and out-of-phase signals through the application of sum and difference signals and adjusts the ratio of gain in stereophonic signals as well as in monophonic and multichannel signal applications. This includes both the primary reference signal, and a plurality of redundant duplicate signals, substantially identical in all respects to the primary reference signal except in relation to magnitude and phase, for the purpose of unfolding, or opening the audio signal content. A pair of output signal levels approximates the golden ratio where the golden ratio is one plus the square root of five divided by two which gives an irrational number 1.618.

Abstract: A volume control system comprises: an amplifying apparatus; and a controller connectable to the amplifying apparatus. The amplifying apparatus includes; a first receiving section for receiving a volume value from the controller, a first input section into which an instruction for changing the volume value is input by a user's operation, a first transmitting section for transmitting the volume value input into the first input section to the controller, and a volume control section for, when the first receiving section receives the volume value or the changed volume value is input into the first input section, controlling a volume value of the amplifying apparatus based on the volume value.

Abstract: An audio mixing device and method are provided. The audio mixing device includes an analog to digital converter (ADC), a converting module, a mixing module, and a down-sample filter. The ADC is adapted to receive an analog signal, and convert the analog signal into a first digital signal. The converting module receives the second digital signal, and adjusts a data rate of the second digital signal according to a data rate of the first digital signal to generate a third digital signal. The mixing module mixes the first digital signal and the third digital signal to output a mixed signal. The down-sample filters down-samples the mixed to output a down-sampled signal.

Abstract: Under the control of a controller, a DSP supplies audio signals received from a switch circuit to a main zone DAC, subjects the audio signals received from the aforementioned switch circuit (i.e., audio signals for main zone use) to down-mixing processing so that the number of channels matches the number of output terminals assigned to each zone, and respectively supplies the audio signals subjected to down-mixing processing to the respective switch circuits of each zone. Each of the aforementioned switch circuits supplies the audio signals received from the subzone DAC to the respective volume adjustor of each zone.

Abstract: A system, processor implemented method, and non-transitory computer readable medium for playing a synthetic stereo on a mono headset with motion sensing. The method comprises a processor receiving movement data from an accelerometer detecting movement of the mono headset. In response to receiving movement data, the processor mixing an output audio signal comprising a left channel signal and a right channel signal and providing the output audio signal comprising a combination of the left channel signal and right channel signal based at least in part on detected movement of the mono headset. The output audio signal having either a substantially equal or unequal combination of the left channel signal and right channel signal based at least in part on detected movement of the mono headset.

Abstract: The DJ controller 10 has a load operation member 82 that loads audio signals to each channel, a synchronization button 84 that realizes a beat synchronization function, and a channel fader 85 that reproduces the loaded audio signals by the fader start function corresponding to each channel.

Abstract: A technique is disclosed to implement crossfading of audio tracks. In one embodiment, the function describing the fade out of the ending audio track and/or the slope describing the fade in of the beginning audio track may be altered to increase the perceptible overlap of the two tracks. In another embodiment, the duration of the fade out and/or of the fade in may be altered to increase the perceptible overlap of the two tracks. In other embodiments, one or both of the function and/or duration of the fade out and/or fade in effect may be altered to improve the perceptibility of the overlap or the audio tracks.

Abstract: An apparatus is provided for remotely monitoring a plurality of amplifiers on a display device. The amplifiers are provided to process audio signals and directly or indirectly connected to a network. In the apparatus, a collecting section collects a group code from each of the amplifiers through the network. The group code is allocated to each amplifier according to a grouping system for grouping the plurality of the amplifiers. A display control section displays a tree diagram of the amplifiers according to the collected group codes on the display device as a graphical representation of the grouping system.

Abstract: A digital audio device has a plurality of input ports that are provided with a plurality of digital audio signals. A plurality of extraction parts extract a clock signal from the digital audio signal, when the clock signal is superimposed in the digital audio signal provided to corresponding input ports. A first selection part selects the extracted clock signal as a word clock when the clock signal is extracted by any one of the plurality of the extraction parts. A frequency storage part stores a frequency of the clock signal selected by the first selection part. An internal clock generator outputs a clock signal having a frequency as specified. A second selection part selects the clock signal output from the internal clock generator as a word clock when no clock signal is extracted by the plurality of the extraction parts, the frequency of the clock signal output from the internal clock generator being set to the frequency stored in the frequency storage part.

Abstract: A device for audio mixing includes a cascade input port and a first cascade input component that includes a first cascade input level detector component that detects an audio level of an upstream sum audio signal. The first cascade input port also includes an attenuator component that attenuates the first upstream mix audio signal by a gain corresponding to difference between the upstream sum audio signal value and a detected audio level of an input sum audio signal. The device also includes a summer component where the signals summed include at least the first upstream sum audio signal. The device also includes an input sum level detector component that detects the audio level of the input sum audio signal. The device also includes a mixer component that is configured to provide a mix output signal by summing, where the signals summed include at least the first attenuated upstream mix signal.

Abstract: Various embodiments relate to a mixing console comprising an audio processing module and a light processing module. The mixing console further comprises a plurality of audio interfaces and a lighting interface. Furthermore, a plurality of actuation elements is comprised. The plurality of audio interfaces is respectively configured for inputting or outputting of audio signals. The audio processing module is configured to control audio signal properties by processing of the plurality of audio signals. The lighting interface is configured to output a lighting control signal. The light processing module is configured to generate the lighting control signal to control lighting properties with the lighting control signal. Each of the plurality of actuation elements is selectively coupled to the audio processing module and/or the light processing module for controlling at least one of the audio signal properties and the lighting properties.

Abstract: In embodiments of the present invention improved capabilities are described for digitally transmitting audio that is converted from analog audio received from analog media pickup devices in a live performance venue by a stage box to a base unit over off-the-shelf twisted pair cable while sending pre-amplification control signals and power over the cable to the stage box. Audio for the performance venue is remotely managed from a virtual audio engineering mixing board that wirelessly communicates audio control commands to the stage box from a handheld computing device.

Abstract: An audio mixing system comprises a plurality of input ports and output ports, and a plurality of input channels and output channels for controlling characteristic of input sound signals. Two or more input ports included in the plurality of input ports or two or more output ports included in the plurality of output ports are registered as a plurality of patch ports. By an instruction to collectively patch a port group, the input ports or the output ports registered as the plurality of patch ports are patched to input channels or output channels respectively by an input or an output patch.

Abstract: An earpiece (100) and acoustic management module (300) for in-ear canal echo suppression control suitable is provided. The earpiece can include an Ambient Sound Microphone (111) to capture ambient sound, an Ear Canal Receiver (125) to deliver audio content to an ear canal, an Ear Canal Microphone (123) configured to capture internal sound, and a processor (121) to generate a voice activity level (622) and suppress an echo of spoken voice in the electronic internal signal, and mix an electronic ambient signal with an electronic internal signal in a ratio dependent on the voice activity level and a background noise level to produce a mixed signal (323) that is delivered to the ear canal (131).

Abstract: Control node includes: current memories provided in corresponding relation to a plurality of equipments to store, for each of the equipments, a first current data set for remote-controlling an operational condition of the equipment and a second current data set for remote-controlling a logical connection between the equipment and another equipment; and library memories provided in corresponding relation to the equipments to store, for each of the equipments, a plurality of first data sets each for remote-controlling the operational condition of the equipment and a plurality of second data sets each for remote-controlling the logical connection between the equipment and another equipment.

Abstract: On a digital mixer, each channel is given a channel definition defining whether the channel is to be used individually or to be used as a group along with a certain channel. When a channel strip to which a user desires to assign and a channel which the user desires to assign are selected, it is determined whether the selected channel is a channel to be used individually or to be used as a group. When it is determined that the selected channel is to be used as a group, channels belonging to the group are assigned to the selected channel strip so that the user can concurrently control respective channels' values of a parameter by use of an operating element provided on the selected channel strip.

Abstract: An audio system for enhancing localization of sound perceived by a listener in a listening position includes two loudspeakers and a signal processing unit. The loudspeakers are arranged distant from each other and from the listening position. The sound is transmitted from each of the loudspeakers to the listening position according to a respective transfer function. The transfer functions have different phase responses over frequency. The signal processing unit is connected upstream of the loudspeakers and receives two electrical input signals to be radiated as respective sound signals by the two loudspeakers. The signal processing unit includes a phase shifter unit that phase-shifts at least one of the electrical input signals such that a difference in phase responses is constant over a substantial portion of the human audible frequency in a frequency band.

Abstract: An image display apparatus includes: an image information input section; an image display section for displaying an image corresponding to the image information; a first sound input section adapted to input a first sound signal; a first sound amplification section adapted to amplify the first sound signal to generate a first amplified sound signal; a second sound input section adapted to input a second sound signal; a second sound amplification section adapted to amplify the second sound signal to generate a second amplified sound signal; a sound mixing section adapted to mix the first amplified sound signal and the second amplified sound signal with each other; an audio output section adapted to output an audio corresponding to a sound signal input from the sound mixing section; and an operation mode setting section adapted to set an operation mode, wherein the sound mixing section mixes the first amplified sound signal and the second amplified sound signal based on the operation mode set by the operation mo

Abstract: A sound mixing apparatus includes mixing processing units 11 to 1k provided according to sampling frequencies and speaker detector 400 that selects at least one speaker sound signal out of plural sound signals inputted to mixing processing units 11 to 1k. Each of mixing processing units 11 to 1k adds up speaker sound signals having the same sampling frequency selected by speaker detector 400 to generate a first added-up sound signal, converts the sampling frequency of the first added-up sound signal into a sampling frequency processable by the other mixing processing units, and further adds up the first added-up sound signal and the first added-up sound signal converted into a sampling frequency processable by the processing unit and supplied from the other mixing processing units.

Abstract: A mixer for a touchscreen device is disclosed. The mixer includes a body. A dock on the body is configured and arranged to receive a touchscreen device therein. The mixer also includes a number of audio inputs and a main audio output. An integrated data interface is configured and arranged to connect to the touchscreen device. An audio codec processor configured and arranged to receive audio through the audio inputs and selectively route mixed audio to the main audio output and through the integrated data interface to the touchscreen device.

Abstract: An audio signal processing system for recording a sound inputted into a channel of a mixer which receives a plurality of audio signals, processes the audio signals in a plurality of channels and outputs the processed signals, and reproducing the recorded audio signal for adjusting parameters of the mixer is provided. The audio signal processing system records, when record is instructed a channel is selected, an audio signal inputted to the selected channel with relation information indicating the selected channel, and reproduces, when reproduction is instructed and a channel is selected, an audio signal which has been stored with relation information indicating the selected channel.

Abstract: A digital to analog conversion apparatus includes a plurality of gain/phase adjusters configured to receive a digital signal and to output a plurality of adjusted digital input signals, a plurality of digital to analog converters coupled to respective ones of the plurality of gain/phase adjusters and configured to receive the adjusted digital input signals and to generate respective analog signals representative of the adjusted digital input signals, a plurality of phase shift elements coupled to respective ones of the plurality of digital to analog converters and configured to shift the phases of the analog signals generated by the digital to analog converters, and a combiner coupled to the outputs of the plurality of digital to analog converters and configured to combine the respective phase-shifted analog signals to form an analog output signal.

Abstract: Signal of a channel selected in accordance with a cue instruction is supplied to a cue bus. Cue signal processing section provided in the cue bus can perform one or more signal processing operations, selected from among a predetermined plurality of different signal processing operations, such as “Delay”, “Insert” and “Equalizer”. For each of a plurality of channel types, a set of setting information is stored which contains information for setting ON or OFF of individual ones of the plurality of different signal processing operations. The set of setting information corresponding to the type of the channel selected via the cue instruction is referenced, and one or more signal processing operations is determined in such a manner that each signal processing operation set in an ON state in the setting file in correspondence with the type of the selected channel is performed on the signal supplied to the cue bus.

Abstract: A digital mixer is configured to store, in response to a store operation by a user, values of parameters for one input channel stored in a current memory together with the bus type of each mixing bus at the time of the store into a library as one preset, and to recall, when recalling the values of the parameters in the stored one preset into the current memory in response to a recall operation by the user, the values of the parameters in the preset after converted into parameters corresponding to the bus type at the time of the recall regarding a part of the buses whose bus type stored does not coincide with the bus type at the time of the recall.

Abstract: A headset includes a wearable body, first and second earphones extending from the wearable body, controls for controlling an external communication/multimedia device wirelessly, a microphone for picking up vocal data from a user of the headset system and a signal processing unit. The signal processing unit includes circuitry for processing the vocal data into a distinctly audible vocal feedback signal, circuitry for enhancing the vocal feedback signal thereby producing an enhanced vocal feedback signal and circuitry for mixing the enhanced vocal feedback signal with audio signals originating from the external communication/multimedia device, thereby producing a mixed output signal and then sending the mixed output signal to the user via the earphones. The external communication/multimedia device comprises a vocal command application and the headset further comprises a vocal command control for sending vocal commands to the external communication/multimedia device and to the vocal command application.

Abstract: A personal electronic device (PED) is provided with a system for delivering activity based suggestive (ABS) messages (e.g., a motivational message, etc.) to a user based upon the current or anticipated activity of the user. In some embodiments, the user can define user preferences, which determine when and how ABS messages are initiated. In some embodiments, the message selection is based upon a detected activity, location, or speed of the user. In some embodiments, the message selection is based upon a detection of a local environmental event.

Abstract: A processing apparatus communicatively connected with a mixer apparatus and having an audio recording function is capable of recording in real time audio signals of one or more channels output from the mixer apparatus. When a snapshot change is to be made for collectively changing a state of a set of signal-processing setting data, the mixer apparatus transmits, to the processing apparatus, a command for setting a given parameter. Upon receipt of the command, the processing sets and records the given parameter, instructed by the received command, into a project that is recording in real time the audio signals of one or more channels.

Abstract: An audio mixer (20) include a chassis (22) adapted to receive a docking tray assembly (24), which in turn is adapted to receive a computing device (26). The computing device functions to operate and control the audio mixer (20), and to this end includes a touch screen display (28). The docking tray assembly (24) includes formed tray (110) and, optionally, an adapter configured as a formed insert (112) that nests with the tray (110) to dock a computing device of a configuration different from the computing device docked directly with the tray (110).

Abstract: A sound mixing apparatus includes mixing processing units 11 to 1k provided according to sampling frequencies. Each of mixing processing units 11 to 1k adds up input sound signals of the same sampling frequency to generate a first added-up sound signal, converts the sampling frequency of the first added-up sound signal into a sampling frequency processable by the other mixing processing units, and supplies sound signals that are converted to the sampling frequency, to the other mixing processing units, adds up, to generate a second added-up sound signal, the first added-up sound signal generated by itself and the first added-up sound signals that are converted to a sampling frequency processable by itself and that are supplied from the other mixing processing units.

Abstract: The present invention relates to a method to create and reproduce a panoramic sound image. Initially, there is a plurality of images associated with sound sequences, these images are for example taken using a camera, this camera having recorded the ambient sound at the time of taking the photograph. The ambient sound is then filtered to keep only the stationary component. Then, the images are concatenated to form a unique image called “panoramic”, each sound sequence being associated with a part of the panoramic image containing the image associated with this sequence. Finally, the commands are introduced to display the parts of the panoramic image. The command also enables to reproduce continually the stationary component of at least a sound content associated with at least a displayed part of the panoramic image. According to an improvement, the sound sequence is reproduced continually until the introduction of a new command.

Abstract: An apparatus for processing a signal and method thereof are disclosed. The present invention includes receiving a downmix signal generated from a plural-channel signal, mix information and phase shift information on the plural-channel signal, upmixing the downmix signal into the plural-channel signal by applying the mix information to the downmix signal, and generating an original plural-channel signal by shifting a phase of at least one channel of the plural-channel signal based on the phase shift information. According to the present invention compensate a reconstructed original plural-channel signal using compensation information (phase shift information), thereby compensating a phase or a gain lost in the plural-channel signal reconstructed by upmixing using mix information.

Abstract: An apparatus for inputting commands required for controlling a mix signal and method thereof are disclosed. The present invention includes an input unit, a control unit converting an input signal received via the input unit to a per-source menu display command, the control unit controlling a per-source menu display image to be outputted based on a source information corresponding to a mix signal in accordance with the per-source menu display command, and a display for outputting the per-source menu display. Accordingly, a volume level is adjusted per a source signal included in such a mix signal as a video signal, an audio signal, and the like or an ambience (relative position) is adjusted. And, a user is always able to confirm information on a source signal (or object signal) associated with a mix signal (or synthetic object signal).

Abstract: A method for mixing of audio signals that allows maintaining of a consistent perceived sound level for the mixed signal by holding the sound level of the dominant signal in the mix constant by adjusting the sound level of the non-dominant signal(s) in relation to the dominant signal. It further includes receiving of a mixing balance input, which denotes the adjustable balance between the main and associated signals. It further includes identification of the dominant signal from the mixing balance input and mixing metadata, from which an appropriate scale factor for the non-dominant signal may also be determined directly from the scaling information, without the need for any analysis or measurement of the audio signals to be mixed. It further includes scaling the non-dominant signal in relation to the dominant signal and combining the scaled non-dominant signal with the dominant signal into a mixed signal.

Abstract: The invention relates to a cover (2) for a portable electronic mixer amplifier (1), said cover (2) comprising at least: a cover shell (4) having a front side (4.1) and a rear side for being mounted on a lower device part (3) of the mixer amplifier (1), closure devices (8) for locking the cover (2) to the lower device part (3), wherein the closure devices (8) can be adjusted between an open and a locked position. According to the invention, the cover (2) comprises a carrying device (6) which allows a user to carry the device, and closure recesses (10) are designed in the cover shell (4) in which the closure devices (8) are accommodated. The closure recesses, in particular actuatable closure parts (20), are preferably aligned in the locked position with the front side (4.1) of the cover shell and protrude when in the open position.

Abstract: Systems and methods augment a target media with a plurality of source media. The target media and source media are processed to form time frequency distributions (TFDs). Target features are extracted from the associated TFD and source features are extracted from each of the associated source TFDs. The target features are segmented into temporal portions that are compared with each of the plurality of source features to determine one or more matched source features having nearest matches to the target feature segments. Portions of the source media associated with the matched source features are mixed with the target media to form an augmented target media, wherein the mixing is based upon a probabilistic mixing algorithm that uses a distance between the matched target feature and source features to define an amplitude of each portion of the source media.

Abstract: Methods and systems for assigning functionality to a plurality of physical input controls of an audio mixing system involve: providing an interface for enabling an operator to select one of a plurality of audio channels and one of a plurality of mixing functional areas, wherein each of the plurality of mixing functional areas includes a plurality of audio mixing functions associated with the functional area; receiving an indication of a selection of one of the plurality of channels by an operator using the interface; receiving an indication of a selection of one of the plurality of audio mixing functional areas by an operator using the interface; and for each of the plurality of physical controls: assigning the physical control to control, for the selected channel, one of the plurality of audio mixing functions associated with the selected audio mixing functional area; and displaying a visual indication of the assigned function.

Abstract: User is allowed to designate a desired mode defining the respective numbers of channels and mixing buses, and processing for mixing input signals of the number of channels corresponding to the designated mode is performed repetitively to generate signals for the individual buses. The time of arrival of the last step in the mixing processing for the number of channels, corresponding to the designated mode, is detected to output an accumulation result obtained at the last step, and new accumulation is started with a digital audio signal inputted at a step following the last step. Digital audio signals processed by a first signal processing circuit are stored into a memory and transmitted to a second signal processing circuit via a cascade-connection. The second signal processing circuit adds the audio signal, processed for each of the steps, to audio signals input via the cascade-connection and writes added signal into the memory.

Abstract: A system and method for reducing or entirely canceling background or ambient noise from a voice transmission from a communications device. A communications device, such as a mobile telephone, is configured with an ambient noise compensation signal generator that is connected between a microphone and a mixer. The original output of the microphone and a compensation signal generated by the ambient noise compensation signal generator are mixed together prior to being passed to a transmitter. In one embodiment a buffer is provided between the microphone and the mixer to help synchronize the timing of the signals to be mixed. In another embodiment a second microphone is employed to detect ambient noise.

Abstract: A sound processing system for a vehicle includes a sound processor that is configured to mix at least one real audio input signal to form at least one virtual output signal. At least one audio signal that is available to drive at least one loudspeaker may be formed using the combination of the virtual output signal and the real audio input signal. The virtual output signal may be post processed to form a predetermined frequency range of the audio signal prior to being combined with the real audio input signal. The audio signal may be created by mixing the real audio input signal with the post processed virtual output signal. Alternatively, the audio signal may be formed by mixing the real audio input signal to form a real audio output signal, and then summing the real audio output signal with the post processed virtual output signal. Mixing may be performed with a crossbar mixer included in the sound processor.

Abstract: User is allowed to designate a desired mode defining the respective numbers of channels and mixing buses, and processing for mixing input signals of the number of channels corresponding to the designated mode is performed repetitively to generate signals for the individual buses. The time of arrival of the last step in the mixing processing for the number of channels, corresponding to the designated mode, is detected to output an accumulation result obtained at the last step, and new accumulation is started with a digital audio signal inputted at a step following the last step. Digital audio signals processed by a first signal processing circuit are stored into a memory and transmitted to a second signal processing circuit via a cascade-connection. The second signal processing circuit adds the audio signal, processed for each of the steps, to audio signals input via the cascade-connection and writes added signal into the memory.

Abstract: An audio information processing apparatus for processing input audio information is adapted to input an audio signal composed of front area audio information that should be input to a front speaker and rear area audio information that should be input to a plurality of speakers. A mixer is adapted to mix the rear area audio information in accordance with an instruction from an instruction circuit.

Abstract: A sub-console 1200 has a lower channel strip group 40 on a front panel 1202, and an upper channel strip group 42 on a rear panel 1206. Left and right displays 52 and 54 are provided between the upper and lower channel strip groups 42 and 40. Either one of the parameter of the upper and lower channel strip groups 42 and 40 is displayed on the left and right displays 52 and 54. With this structure, the width of the sub-console 1200 can be reduced, and the positional correspondence relationship between the respective channel strip groups and the left and right displays 52 and 54 can be maintained. Accordingly, a high operability can be realized.

Abstract: An apparatus for utilizing spatial information for audio signal enhancement in a multiple distributed network may include a processor. The processor may be configured to receive representations of a plurality of audio signals including at least one audio signal received at a first device and at least a second audio signal received at a second device. The first and second devices may be part of a common acoustic space network and may be arbitrarily positioned with respect to each other. The processor may be further configured to combine the first and second audio signals to form a composite audio signal, and provide for communication of the composite audio signal along with spatial information relating to a sound source of at least one of the plurality of audio signals to another device.

Abstract: A gaming system includes a chair having an electrical connector and a gaming machine having an electrical connector, wherein the chair electrical connector is removably couplable to the gaming machine electrical connector.

Abstract: Mixer and one or more external devices, related to audio signal processing, are interconnected via a communication network, such as a LAN. For a particular one of the external devices for which communication with the mixer via the communication network is to be established, a network address unique to the particular external device and a communication protocol to be used for data communication with the particular external device are designated by entry operation by a user. Logical connection is established such that data communication is performed, in accordance with the designated communication protocol, between the mixer and the particular external device corresponding to the designated network address. Thus, data communication is performed, via the communication network, between the mixer and the particular external device for which the logical connection has been established.

Abstract: A user-friendly system for real time performance and user modification of one or more previously recorded musical compositions facilitates user involvement in the creative process of a new composition that reflects the user's personal style and musical tastes. Such a system may be implemented in a small portable electronic device such as a handheld smartphone that includes a stored library of musical material including original and alternative versions of each of several different components of a common original musical composition, and a graphic user interface that allows the user to select at different times while that original composition is being performed, which versions of which components are to be incorporated to thereby create in real time a new performance that includes elements of the original performance, preferably enhanced at various times with user selected digital sound effects including stuttering and filtering.

Abstract: User is allowed to designate a desired mode defining the respective numbers of channels and mixing buses, and processing for mixing input signals of the number of channels corresponding to the designated mode is performed repetitively to generate signals for the individual buses. The time of arrival of the last step in the mixing processing for the number of channels, corresponding to the designated mode, is detected to output an accumulation result obtained at the last step, and new accumulation is started with a digital audio signal inputted at a step following the last step. Digital audio signals processed by a first signal processing circuit are stored into a memory and transmitted to a second signal processing circuit via a cascade-connection. The second signal processing circuit adds the audio signal, processed for each of the steps, to audio signals input via the cascade-connection and writes added signal into the memory.

Abstract: For headphone subsystems that employ common ground switches for speaker outputs (for example), there can be a significant issue with cross-talk and ground noise. Here, configurations for an amplifier and switch network are provided, which generally cancel noise from the “ground switch,” so as to provide an improvement over conventional configurations with little overhead. Additionally, the cross-talk for these configurations are not generally dependent on the “ground switch” or speaker impedance.

Abstract: An audio system including an inverter, a first amplifier, a first mixer, a main speaker, and a first audio output port is provided. The inverter receives a first audio signal and inverts the first audio signal into an inverted audio signal. The first amplifier receives the inverted audio signal from the inverter and multiplies the inverted audio signal by a first gain to generate a first compensating audio signal. The first mixer receives a second audio signal and mixes the first compensating audio signal with the second audio signal to generate a first low-interference audio signal. The main speaker receives and plays the first audio signal. The first audio output port receives the first low-interference audio signal from the first mixer and transmits the first low-interference audio signal to a first external speaker. An electronic device and a car audio system capable of generating the low-interference audio signal are provided.