An electronic device is provided. The electronic device includes an integrated circuit (IC); a sonic vibrator arranged on one side of the IC; a speaker; and a processor configured to: control the speaker based on a sound signal, and filter a low-frequency band signal that is less than or equal to a threshold frequency from the sound signal and provide the low-frequency band signal to the sonic vibrator.

An electronic device is provided. The electronic device includes an integrated circuit (IC); a sonic vibrator arranged on one side of the IC; a speaker; and a processor configured to: control the speaker based on a sound signal, and filter a low-frequency band signal that is less than or equal to a threshold frequency from the sound signal and provide the low-frequency band signal to the sonic vibrator.

A volume adjustment device includes a microphone, a speaker, and a signal processing unit. The at least one signal processing unit includes at least one processor and at least one memory. The signal processing unit is configured to output a measurement sound from the speaker. The signal processing unit is also configured to measure a first impulse response with the microphone. The signal processing unit is also configured to adjust a volume of the measurement sound output from the speaker based on a direct sound component of the first impulse response and an indirect sound component of the first impulse response.

A volume adjustment device includes a microphone, a speaker, and a signal processing unit. The at least one signal processing unit includes at least one processor and at least one memory. The signal processing unit is configured to output a measurement sound from the speaker. The signal processing unit is also configured to measure a first impulse response with the microphone. The signal processing unit is also configured to adjust a volume of the measurement sound output from the speaker based on a direct sound component of the first impulse response and an indirect sound component of the first impulse response.

Various acoustic manipulation and microphone gain adjustment techniques are enabled. For instance, a method comprises receiving, by a voice-enabled device comprising a processor and from a microphone, an input comprising environmental audio, determining, by the voice-enabled device, a level of the environmental audio, determining, by the voice-enabled device, a gain-adjust value based on the environmental audio, and adjusting, by the voice-enabled device, a gain of the microphone by the gain-adjust value.

Various acoustic manipulation and microphone gain adjustment techniques are enabled. For instance, a method comprises receiving, by a voice-enabled device comprising a processor and from a microphone, an input comprising environmental audio, determining, by the voice-enabled device, a level of the environmental audio, determining, by the voice-enabled device, a gain-adjust value based on the environmental audio, and adjusting, by the voice-enabled device, a gain of the microphone by the gain-adjust value.

A power detector has a signal input terminal, N limiting amplifiers, N rectifiers and a signal output terminal. N is an integer greater than 1. The signal input terminal receives an input signal, and the signal output terminal outputs a detection signal. The N limiting amplifiers generate N amplified signals according to N attenuated signals having different attenuation. Each limiting amplifier receives one of the N attenuated signals and outputs one of the N amplified signals. Each rectifier receives a corresponding amplified signal and outputs a rectified signal. The detection signal is associated with the sum of N rectified signals outputted from the N rectifiers, and all transistors of the power detector are bipolar junction transistors.

A logarithmic amplifier includes a logarithmic current preamplifier circuit and logarithmic amplifier circuit. The logarithmic current preamplifier circuit includes an inverting input terminal, an output terminal, and a first diode. The first diode is coupled between the inverting input terminal of the logarithmic current preamplifier circuit and the output terminal of the logarithmic current preamplifier circuit. The logarithmic amplifier circuit includes an inverting input terminal, an output terminal, and a second diode. The inverting input terminal of the logarithmic amplifier circuit is coupled to the output terminal of the logarithmic current preamplifier circuit. The second diode is coupled between the inverting input terminal of the logarithmic amplifier circuit and the output terminal of the logarithmic amplifier circuit.

A logarithmic amplifier includes a logarithmic current preamplifier circuit and logarithmic amplifier circuit. The logarithmic current preamplifier circuit includes an inverting input terminal, an output terminal, and a first diode. The first diode is coupled between the inverting input terminal of the logarithmic current preamplifier circuit and the output terminal of the logarithmic current preamplifier circuit. The logarithmic amplifier circuit includes an inverting input terminal, an output terminal, and a second diode. The inverting input terminal of the logarithmic amplifier circuit is coupled to the output terminal of the logarithmic current preamplifier circuit. The second diode is coupled between the inverting input terminal of the logarithmic amplifier circuit and the output terminal of the logarithmic amplifier circuit.

An amplifying device includes a first amplifier, a voltage-limiting circuit, a second amplifier, a first controller, and a second controller. The first amplifier is configured to amplify an input signal. The voltage-limiting circuit is configured to limit a voltage of an output signal from the first amplifier to within a limit range. The second amplifier is configured to amplify an output signal from the voltage-limiting circuit. The first controller is configured to control the limit range in accordance with a current supplied to a load from the second amplifier. The second controller is configured to decrease an amplification factor of the first amplifier in a state in which the voltage-limiting circuit limits the voltage of the output signal from the first amplifier.