In a gain control device, a gain control voltage adjust circuit includes a time-constant circuit and outputs an adjusted gain control voltage depending on an adjustment signal and a control voltage generated by a differential amplifier upon input of the adjustment signal. An adjustment signal generation circuit outputs the adjustment signal during an adjustment signal output period. This period is a specified period before a first burst signal is output from a signal output unit and where a burst signal is not output from the signal output unit. The adjustment signal is to make the adjusted gain control voltage closer to a target voltage. The target voltage is a gain control voltage output from the gain control voltage adjust circuit and corresponding to a steady part of a second burst signal. The second burst signal is a burst signal output before the first burst signal.

In a gain control device, a gain control voltage adjust circuit includes a time-constant circuit and outputs an adjusted gain control voltage depending on an adjustment signal and a control voltage generated by a differential amplifier upon input of the adjustment signal. An adjustment signal generation circuit outputs the adjustment signal during an adjustment signal output period. This period is a specified period before a first burst signal is output from a signal output unit and where a burst signal is not output from the signal output unit. The adjustment signal is to make the adjusted gain control voltage closer to a target voltage. The target voltage is a gain control voltage output from the gain control voltage adjust circuit and corresponding to a steady part of a second burst signal. The second burst signal is a burst signal output before the first burst signal.

Methods and systems are provided for volume interactions for connected playback devices. In an example implementation, a first playback device applies a state variable update associated with a group of playback devices comprising the first playback device and one or more second playback devices. The state variable update indicates a limited volume range associated with the first playback device. The first playback device renders audio content in synchrony with the one or more second playback devices. Rendering the audio content involves a subwoofer speaker of the first playback device rendering a bass frequency component of the audio content. The first playback device receives input data indicating a group volume adjustment for the group of playback devices and adjusting a playback volume of the first playback device based on the group volume adjustment and the limited volume range.

Methods and systems are provided for volume interactions for connected playback devices. In an example implementation, a first playback device applies a state variable update associated with a group of playback devices comprising the first playback device and one or more second playback devices. The state variable update indicates a limited volume range associated with the first playback device. The first playback device renders audio content in synchrony with the one or more second playback devices. Rendering the audio content involves a subwoofer speaker of the first playback device rendering a bass frequency component of the audio content. The first playback device receives input data indicating a group volume adjustment for the group of playback devices and adjusting a playback volume of the first playback device based on the group volume adjustment and the limited volume range.

Disclosed is a method of processing an audio recording for facilitating production of competitively loud mastered audio recording with reduced distortion. The method includes receiving an audio file comprising the audio. Further, the method includes providing a first attenuation to the audio recording to produce a first attenuated audio recording and routing the first attenuated audio recording onto an input of a first bus. Further, the method includes providing a second attenuation to the first attenuated audio recording available to generate a second attenuated audio recording and routing the second attenuated audio recording onto an input of a second bus. Further, the method includes providing a third attenuation to the second attenuated audio recording to generate a third attenuated audio recording. Yet further, the method includes processing the third attenuated audio recording to generate a track output. Moreover, the method includes transmitting the track output to the electronic device.

Disclosed is a wire control earphone, comprising a USB plug, an earphone wire, left and right ear receivers and a volume adjuster. The USB plug has a power-supply pin, a grounding pin and two signal pins. The earphone wire has a power-supply wire, two receiver wires and a ground wire which are correspondingly connected with the pins of the USB plug. The right ear receiver is connected between the right ear receiver wire and the ground wire. The volume adjuster is powered via the power-supply wire and comprises an adjustment triggering unit for outputting a volume adjustment signal, a processing unit for determining a voltage adjustment value according to the volume adjustment signal and outputting a digital voltage adjustment value, and a digital-to-analog conversion unit for converting the digital voltage adjustment value into an analog voltage adjustment value and applying the analog voltage adjustment value to the two receiver wires.

An amplification circuit includes a filter circuit, an amplifier, a capacitor, a bypass line, and a switch circuit that includes a first FET and a second FET connected in series between one end and the other end of the bypass line, a first resistance element connected in series to a gate of the first FET, and a second resistance element connected in series to a gate of the second FET. A first control signal is supplied to the gate of the first FET. A second control signal is supplied to the gate of the second FET. A product of a gate length and a gate width of the first FET and a resistance value of the first resistance element is smaller than a product of a gate length and a gate width of the second FET and a resistance value of the second resistance element.

An exemplary audio enhancement system substantially eliminates latency by returning audio input signals in amplified form directly in the analog domain to the source, thereby reducing signal degradation and removing redundancy from digital and analog audio transmission and processing architectures.

An electronic device is provided. The electronic device includes a display, communication circuitry, and a processor operatively connected to the display and the communication circuitry, wherein the processor is configured to transmit audio data to an external device through the communication circuitry, receive a user input for adjustment of a volume level of an audio output through the external device, in response to the user input, check whether a first volume level being set in the electronic device is within a specified range, select one of the first volume level of the electronic device or a second volume level of the external device to be adjusted corresponding to the user input based on whether the first volume level being set in the electronic device is within the specified range, display a volume panel UI comprising the selected one of the first volume level or the second volume level and a graphic object indicating the one of the electronic device or the external device, when adjusting the selected one of the first volume level or the second volume level, and change the graphic object indicating the selected one of the electronic device or the external device to a graphic object indicating other of the electronic device or the external device and switch the selected one of the first volume level or the second volume level to other of the first volume level or the second volume level to be adjusted corresponding to the user input, when adjusting the other of the first volume level or the second volume level while displaying the volume panel UI.

Variable gain amplifiers (VGA) with output phase invariance are provided herein. In certain embodiments, a VGA is operable in a selected gain setting chosen from multiple gain settings that provide different amounts of amplification to a radio frequency (RF) input signal. The VGA includes a gain transistor that has a substantially constant bias current across the gain settings, such that the VGA's output phase, input impedance matching, and/or input return loss are substantially constant. The gain setting of the VGA is selected by controlling relative biasing of a pair of cascode transistors each connected to the gain transistor by a corresponding degeneration resistor. The degeneration resistors provide compensation that reduces or eliminates a difference in output phase of the VGA across gain settings, for instance, by introducing a zero in a transfer function of the VGA that cancels a pole arising from the cascode transistors.