Abstract: A circuit and a method for controlling an audio adapter are provided. The audio adapter includes a button and a microphone, and the microphone is adapted for generating a recorded data. The control circuit includes a button detection circuit, a first-in, first-out (FIFO) data buffer, a USB endpoint buffer, a mute circuit and a USB endpoint control circuit. The button detection circuit is used for detecting whether the button is triggered. The FIFO data buffer is used for storing the recorded data. The USB endpoint buffer is used for storing the recorded data. The mute circuit is used for controlling whether the recorded data is transmitted to the USB endpoint buffer according to whether the button is triggered. The USB endpoint control circuit is used for controlling whether the audio adapter outputs the recorded data according to whether the button is triggered.

Abstract: An external audio device includes a USB (Universal Serial Bus) plug, an audio socket, a USB communication circuit, an audio socket detection circuit, a first power circuit, a second power circuit, and a control circuit. The USB communication circuit establishes a connection with a computer device coupled to the USB plug according to the communication protocol of USB. The audio socket detection circuit detects a plug-in state of the audio socket. The first power circuit generates a second power to the USB communication circuit according to a first power received from the USB plug. The second power circuit generates a third power to the audio socket detection circuit according to the first power. The control circuit enables or disables the first power circuit according to the plug-in state of the audio socket.

Abstract: A circuit and a method for controlling an audio adapter are provided. The audio adapter includes a button and a microphone, and the microphone is adapted for generating a recorded data. The control circuit includes a button detection circuit, a first-in, first-out (FIFO) data buffer, a USB endpoint buffer, a mute circuit and a USB endpoint control circuit. The button detection circuit is used for detecting whether the button is triggered. The FIFO data buffer is used for storing the recorded data. The USB endpoint buffer is used for storing the recorded data. The mute circuit is used for controlling whether the recorded data is transmitted to the USB endpoint buffer according to whether the button is triggered. The USB endpoint control circuit is used for controlling whether the audio adapter outputs the recorded data according to whether the button is triggered.

Abstract: A temperature adaptive audio amplifier device includes a digital analog convertor, a gain controller, an amplifier, a temperature sensor and a decision circuit. The digital analog convertor transforms a digital audio signal into an analog convertor. The gain controller includes a gain value and is configured to perform gain processing on the analog audio signal and generate a gained analog audio signal. The amplifier is configured to amplify the gained analog audio signal and generates an amplified analog audio signal. The temperature sensor generates a temperature detect signal according to a junction temperature of the amplifier. The decision circuit receives the temperature detect signal and generates an adaptive gain adjustment signal to the gain controller. The adaptive gain adjustment signal is used to adjust the junction temperature of the amplifier to be within an upper temperature threshold and a lower temperature threshold.

Abstract: A temperature adaptive audio amplifier device includes a digital analog convertor, a gain controller, an amplifier, a temperature sensor and a decision circuit. The digital analog convertor transforms a digital audio signal into an analog convertor. The gain controller includes a gain value and is configured to perform gain processing on the analog audio signal and generate a gained analog audio signal. The amplifier is configured to amplify the gained analog audio signal and generates an amplified analog audio signal. The temperature sensor generates a temperature detect signal according to a junction temperature of the amplifier. The decision circuit receives the temperature detect signal and generates an adaptive gain adjustment signal to the gain controller. The adaptive gain adjustment signal is used to adjust the junction temperature of the amplifier to be within an upper temperature threshold and a lower temperature threshold.

Abstract: A control method and a control system for an audio device are disclosed. The control method and control system are applied to a USB audio adapter that includes an analog audio interface and is connected to a host. The control method includes steps of: detecting whether the analog audio interface is connected to a target device or detecting a function of the target device, and generating a detection result accordingly; controlling the USB audio adapter to operate in a disconnected mode; and controlling the USB audio adapter to continue operating in the disconnected mode according to the detection result, or controlling, according to the detection result, the USB audio adapter to operate in a connected mode and transmit audio data to the host and/or receive audio data from the host.

Abstract: A control method and a control system for an audio device are disclosed. The control method and control system are applied to a USB audio adapter that includes an analog audio interface and is connected to a host. The control method includes steps of: detecting whether the analog audio interface is connected to a target device or detecting a function of the target device, and generating a detection result accordingly; controlling the USB audio adapter to operate in a disconnected mode; and controlling the USB audio adapter to continue operating in the disconnected mode according to the detection result, or controlling, according to the detection result, the USB audio adapter to operate in a connected mode and transmit audio data to the host and/or receive audio data from the host.

Abstract: The signal generating apparatus includes a signal modulating unit, a selection signal generating unit, and a phase adjusting unit. The signal modulating unit is utilized for processing a modulation upon an input signal to generate a modulated signal. The selection signal generating unit is utilized for generating at least a first selection signal. The phase adjusting unit is coupled to the signal modulating unit and the selection signal generating unit, and is utilized for receiving the modulated signal and adjusting a pulse width of the modulated signal to generate an output signal according to the first selection signal.

Abstract: The present invention provides an audio data transmission method for transmitting encrypted audio data, an audio processing system and computer system thereof. The audio data transmission method includes providing an audio data, performing an encryption process upon the audio data according to an encryption standard and a format of the audio data, transmitting the encrypted audio data to an audio device according to a link standard, and utilizing the audio device to perform a decryption process upon the encrypted audio data.

Abstract: The signal generating apparatus includes a signal modulating unit, a selection signal generating unit, and a phase adjusting unit. The signal modulating unit is utilized for processing a modulation upon an input signal to generate a modulated signal. The selection signal generating unit is utilized for generating at least a first selection signal. The phase adjusting unit is coupled to the signal modulating unit and the selection signal generating unit, and is utilized for receiving the modulated signal and adjusting a pulse width of the modulated signal to generate an output signal according to the first selection signal.

Abstract: A controller of a power amplifier includes an oversampler for oversampling an incoming digital signal to generate an oversampled signal, a controlling module for generating a first control signal and a second control signal according to the oversampled signal, a PWM circuit for generating a first PWM signal according to the first control signal, and a pulse width adjuster for adjusting a pulse width of the first PWM signal according to the second control signal to generate a second PWM signal for controlling a power stage of the power amplifier.

Abstract: The present invention provides an audio data transmission method for transmitting encrypted audio data, an audio processing system and computer system thereof. The audio data transmission method includes providing an audio data, performing an encryption process upon the audio data according to an encryption standard, transmitting the encrypted audio data to an audio device according to a link standard, and utilizing the audio device to perform a decryption process upon the encrypted audio data.

Abstract: A controller of a power amplifier includes an oversampler for oversampling an incoming digital signal to generate an oversampled signal, a controlling module for generating a first control signal and a second control signal according to the oversampled signal, a PWM circuit for generating a first PWM signal according to the first control signal, and a pulse width adjuster for adjusting a pulse width of the first PWM signal according to the second control signal to generate a second PWM signal for controlling a power stage of the power amplifier.