Abstract: According to the present disclosure, a measuring method of liquid mixture purity includes steps as follows. A storage tank is provided, wherein the storage tank is configured for storing a liquid mixture including formic acid and water. A calculating unit is provided, wherein a plurality of formic acid purity values are saved in the calculating unit. A pressure-decreasing and heating step is performed by reducing a pressure of the storage tank and heating the storage tank. A measuring step is performed by measuring in the inner space of the storage tank to obtain a pressure value, and measuring the liquid mixture simultaneously to obtain a temperature value. A calculating step is performed by inputting the pressure value and the temperature value into the calculating unit, wherein the calculating unit outputs one of the formic acid purity values corresponding thereto.

Abstract: A leveling equalizer includes a graphic equalizer circuit, a first multiplication circuit, a second multiplication circuit, an addition circuit, and a gain control circuit. The graphic equalizer circuit processes a first input signal and output a first output signal and a second output signal. The first multiplication circuit multiplies the first output signal and one of an adjustable gain value and a fixed gain value to generate a first adjusted output signal. The second multiplication circuit multiplies the second output signal and another of the adjustable gain value and the fixed gain value to generate a second adjusted output signal. The addition circuit combines the first adjusted output signal and the second adjusted output signal to generate an equalizer output signal. The gain control circuit dynamically adjusts the adjustable gain value according to the equalizer output signal.

Abstract: A loudspeaker controller for estimating a fundamental resonance frequency of a loudspeaker includes: an amplifier circuit, arranged to generate a driving signal of the loudspeaker according to an audio input signal; a sensing circuit, arranged to sense characteristics of the driving signal to generate a measurement signal; a plurality of band pass filter circuits, arranged to filter the measurement signal to generate a plurality of filter outputs, respectively, wherein the plurality of band pass filter circuits have different passbands; and an estimation circuit, arranged to estimate the fundamental resonance frequency according to the plurality of filter outputs.

Abstract: A loudspeaker controller for estimating a fundamental resonance frequency of a loudspeaker includes: an amplifier circuit, arranged to generate a driving signal of the loudspeaker according to an audio input signal; a sensing circuit, arranged to sense characteristics of the driving signal to generate a measurement signal; a plurality of band pass filter circuits, arranged to filter the measurement signal to generate a plurality of filter outputs, respectively, wherein the plurality of band pass filter circuits have different passbands; and an estimation circuit, arranged to estimate the fundamental resonance frequency according to the plurality of filter outputs.

Abstract: A leveling equalizer includes a graphic equalizer circuit, a first multiplication circuit, a second multiplication circuit, an addition circuit, and a gain control circuit. The graphic equalizer circuit processes a first input signal and output a first output signal and a second output signal. The first multiplication circuit multiplies the first output signal and one of an adjustable gain value and a fixed gain value to generate a first adjusted output signal. The second multiplication circuit multiplies the second output signal and another of the adjustable gain value and the fixed gain value to generate a second adjusted output signal. The addition circuit combines the first adjusted output signal and the second adjusted output signal to generate an equalizer output signal. The gain control circuit dynamically adjusts the adjustable gain value according to the equalizer output signal.

Abstract: A parametric equalizer includes a first parametric equalizer circuit, a second parametric equalizer circuit, a first multiplication circuit, a second multiplication circuit, an addition circuit, and a weighting control circuit. The first parametric equalizer circuit processes an input signal to output a first output signal. The second parametric equalizer circuit processes the input signal to output a second output signal. The first multiplication circuit multiplies the first output signal and a first weighting value to generate a first adjusted output signal. The second multiplication circuit multiplies the second output signal and a second weighting value to generate a second adjusted output signal. The addition circuit combines the first adjusted output signal and the second adjusted output signal to generate an equalizer output signal. The weighting control circuit dynamically adjusts the first weighting value and the second weighting value according to the equalizer output signal.

Abstract: The present disclosure illustrates a hydrogen water generator, a micro/nano hydrogen bubble water generator and a micro/nano hydrogen bubble water production method. The hydrogen water generator of the present disclosure receives water and hydrogen gas, and five sections are formed inside the main body of the hydrogen water generator, so as to mix the hydrogen gas and the water to produce hydrogen water, without using a compressor to pressure the hydrogen gas. The water flows to a pressuring section via a liquid input section, and is pressured by a pressuring section and the pressured water further flows to a draining and mixing section to be mixed with the hydrogen gas. The water mixed with hydrogen gas flows to a decompressing section to be decompressed, and then passes a hydrogen water output section to output hydrogen water with micro/nano hydrogen bubbles.

Abstract: A voice control device includes a receiving circuit, a voice processing circuit, a memory controller and a main processing circuit. The receiving circuit sequentially receives first voice data and second voice data, and stores the same in a first memory. The voice processing circuit reads the first voice data from the first memory, and generates a control signal when the first voice data includes a predetermined command. The memory controller reads the second voice data from the first memory according to the control signal, and stores the second voice data in a second memory. The main processing circuit reads the second voice data from the second memory according to the control signal so as to perform voice recognition.

Abstract: A television signal processing circuit includes an audio/video (AV) signal generating circuit, an intermediate frequency (IF) mixer, a first filter, a radio-frequency (RF) mixer, a second filter and a digital-to-analog converter (DAC). The AV signal generator generates a digital AV signal. The IF mixer converts the digital AV signal to an IF AV signal. The first filter filters the IF AV signal to generate a filtered IF AV signal. The RF mixer converts the filtered IF AV signal to an RF AV signal. The second filter filters the RF AV signal to generate a filtered RF AV signal. The DAC converts the filtered RF AV signal to an analog AV signal and transmits the analog AV signal to an antenna.

Abstract: A television signal processing circuit includes an audio/video (AV) signal generating circuit, an intermediate frequency (IF) mixer, a first filter, a radio-frequency (RF) mixer, a second filter and a digital-to-analog converter (DAC). The AV signal generator generates a digital AV signal. The IF mixer converts the digital AV signal to an IF AV signal. The first filter filters the IF AV signal to generate a filtered IF AV signal. The RF mixer converts the filtered IF AV signal to an RF AV signal. The second filter filters the RF AV signal to generate a filtered RF AV signal. The DAC converts the filtered RF AV signal to an analog AV signal and transmits the analog AV signal to an antenna.

Abstract: An audio processing apparatus including an audio phase detecting device and an adjusting device is provided. After detecting a phase relationship between a first channel signal and a second channel signal, the audio phase detecting device generates a phase control signal. The adjusting device is coupled to the audio phase detecting device and used for selectively adjusting the first channel signal according to the phase control signal.

Abstract: A hydrogen carbon cleaning method for a vehicle is provided, which includes the following steps. First, a reformer is provided. Then, high purity hydrogen is provided by the reformer. Next, a hydrogen carbon cleaning process is performed on a vehicle with the high purity hydrogen.

Abstract: A dynamic element matching method and system thereof is provided. The method includes grouping a plurality of switches into a plurality of groups; allocating a plurality of to-be-turned-on switches of the switches for an input signal to the groups; and maintaining a switch activity of each of the groups at a predetermined value. Accordingly, mismatch noise and harmonic noise are effectively reduced.

Abstract: A speech enhancement device and a method for the same are included. The device includes a down-converter, a speech enhancement processor, and an up-converter. The method includes steps of down-converting audio signals to generate down-converted audio signals; performing speech enhancement on the down-converted audio signals to generate speech-enhanced audio signals; and up-converting the speech enhancement audio signals to generate up-converted audio signals.

Abstract: An audio processing apparatus including an audio phase detecting device and an adjusting device is provided. After detecting a phase relationship between a first channel signal and a second channel signal, the audio phase detecting device generates a phase control signal. The adjusting device is coupled to the audio phase detecting device and used for selectively adjusting the first channel signal according to the phase control signal.

Abstract: A dynamic element matching method and system thereof is provided. The method includes grouping a plurality of switches into a plurality of groups; allocating a plurality of to-be-turned-on switches of the switches for an input signal to the groups; and maintaining a switch activity of each of the groups at a predetermined value. Accordingly, mismatch noise and harmonic noise are effectively reduced.

Abstract: A volume control apparatus and method is provided. The volume control apparatus includes an automatic gain controller and an equal loudness controller. The method includes steps of receiving an original sound signal by the automatic gain controller, adjusting the original sound signal by the automatic gain controller according to a target volume to output an auto-gain sound signal that gradually converges to the target volume, and rendering a loudness curve according to the target volume for compensating the auto-gain sound signal to output a compensated sound signal.

Abstract: A speech enhancement device and a method for the same are included. The device includes a down-converter, a speech enhancement processor, and an up-converter. The method includes steps of down-converting audio signals to generate down-converted audio signals; performing speech enhancement on the down-converted audio signals to generate speech-enhanced audio signals; and up-converting the speech enhancement audio signals to generate up-converted audio signals.

Abstract: An asynchronous sample rate converter interpolates and filters a digital audio input signal to produce a filtered, up-sampled first signal. A FIFO memory receives the first signal and stores samples thereof at locations determined by a write address and presents stored samples from locations determined by a read address. The presented samples are passed through an interpolation and resampling circuit to produce a continuous-time signal which is re-sampled to produce a signal that is up-sampled relative to a desired output. That signal then is filtered and down-sampled to produce the output signal. Sample rate estimating circuitry computes a difference signal representative of a time at which a data sample of the audio input signal is received and a time at which a corresponding audio output sample is required, and address generation circuitry generates the read and write addresses.

Abstract: An asynchronous sample rate converter interpolates and filters a digital audio input signal to produce a filtered, up-sampled first signal. A FIFO memory receives the first signal and stores samples thereof at locations determined by a write address and presents stored samples from locations determined by a read address. The presented samples are passed through an interpolation and resampling circuit to produce a continuous-time signal which is re-sampled to produce a signal that is up-sampled relative to a desired output. That signal then is filtered and down-sampled to produce the output signal. Sample rate estimating circuitry computes a difference signal representative of a time at which a data sample of the audio input signal is received and a time at which a corresponding audio output sample is required, and address generation circuitry generates the read and write addresses.