An audio mixer includes a user interface, panners, a first adder, a localization device, a second adder, and an output circuit. The user interface supplies a first parameter and a second parameter for each channel based on a user operation. The first parameter indicates a position in a right-left direction. The second parameter specifies internalization or externalization. The panners respectively correspond to channels and, based on the first parameter, pan a sound signal corresponding to the each channel to generate first stereo signals. The first adder generates a second stereo signal by mixing first stereo signals respectively corresponding to externalization channels. The localization device generates two third stereo signals. The second adder generates a fourth stereo signal by mixing the two third stereo signals and first stereo signals respectively corresponding to internalization channels. The output circuit outputs the fourth stereo signal.

The present disclosure provides a system for the synthesis of external sound of a vehicle, the system comprising a hazard analysis unit configured to detect a collision hazard between the vehicle and at least one further road user, in particular an outside traffic participant; at least one electroacoustic transducer; and a sound processing unit configured to generate an audio signal representing an, in particular vehicle dependent, synthetic noise signal and to control the at least one electroacoustic transducer to output a synthetic external sound based on the audio signal, wherein the sound processing unit is configured to modify the audio signal to enhance the perceptibility of the synthetic external sound by the further road user upon detection of the collision hazard.

Embodiments of the present disclosure disclose a method for recording sound of a video-recorded object and a mobile terminal, so as to reduce background noise in recorded sound of a video-recorded object, and improve quality of the recorded sound. The method in the embodiments of the present disclosure includes: obtaining, by a mobile terminal by means of facial recognition, position information of the video-recorded object; and performing processing on recorded sound signals, so as to enhance signal intensity of a sound signal at a position of the video-recorded object, and attenuate signal intensity of a sound signal at another position, to obtain sound at the position of the video-recorded object.

A clock generator receives first and second clock signals, and input representing a desired frequency ratio. A comparison is made between frequencies of an output clock signal and the first clock signal, and a first error signal represents the difference between the desired frequency ratio and this comparison result. The first error signal is filtered. A comparison is made between frequencies of the output clock signal and the second clock signal, and a second error signal represents the difference between the filtered first error signal and this comparison result. The second error signal is filtered. A numerically controlled oscillator receives the filtered second error signal and generates an output clock signal. As a result, the output clock signal has the jitter characteristics of the first input clock signal over a useful range of jitter frequencies and the frequency accuracy of the second input clock signal.

Automatic equalization for consistent headphone may take place in a playback mode of operation in which ANC is turned off and there is no direct feedback from an internal microphone (to the input of a speaker). An automatic user content equalization process is active during that mode of operation which adapts a filter AEQ to restore a flat or other desired frequency response at the output of the speaker despite variation in headphone fit. An estimate of a transfer function of a path S is determined, wherein the path S is from i) the input of the speaker of the headphone to the internal microphone signal. The filter AEQ is adapted based on the estimate of the transfer function of the path S while it filters user content audio that drives the input of the speaker of the headphone. Other embodiments are also described and claimed.

Apparatus and methods for processing an audio signal. The apparatus may include a digital signal processor (“DSP”) configured to receive an audio signal from a vehicular audio signal line. The audio signal may include a flat component and a compensatory component. The flat component may correspond to the audio signal in a state before combination with the compensatory component. The compensatory component may include an OEM EQ component. The apparatus may include a microprocessor in electronic communication with the DSP. The microprocessor may be configured to retrieve from the memory a restorative signal component. The microprocessor may be configured to instruct the DSP to apply the restorative signal component to the audio signal to reduce the audio signal to the flat component.

A computer, including a processor and a memory, the memory including instructions to be executed by the processor to determine a first root-mean-square signal level of an audio data stream with a first delay, apply a bass shelf filter to the audio data stream based on the first root-mean-square signal level and an audio volume level, determine a second root-mean-square signal level of an audio data stream with a second delay and apply a treble shelf filter to the audio data stream based on the second root-mean-square signal level and the audio volume level. The instructions include further instructions to output the audio data stream to an audio amplifier and one or more speakers.

A method for controlling a mobile terminal, the method including generating a first sound based on first information related to audio output; generating second information related to the audio output based on the first information and features of the first sound; and adjusting a volume or a frequency of a second sound based on the second information and outputting the second sound with adjusted volume or adjusted frequency, in which the first sound comprises a first sub-sound output through a speaker, a second sub-sound output from a case of the mobile terminal that is vibrated by the first sub-sound, and a third sub-sound output by a resting surface that comes in contact with the case of the mobile terminal and is vibrated by vibration of the case of the mobile terminal.

A method for changing an image file based on a toning coefficient includes receiving an image file including an image having a plurality of pixels. Toning characteristic function is determined for each pixel of the received image. Distribution of the plurality of pixels of the received image is analyzed using the toning characteristic function. The toning coefficient of the received image is determined based on the analyzed distribution of the plurality of pixels. A degree of toning of the received image file is changed using a user specified criteria based on the determined toning coefficient.

A system that comprises an instrument microphone comprising a clip and a wireless transmitter is disclosed. The clip is constructed to couple the instrument microphone to a brass or woodwind instrument. The system comprises a headgear apparatus microphone comprising a wireless transmitter. The headgear apparatus microphone is constructed to coupled to a head of a vocalist. The system comprises a Bluetooth speaker.