Abstract: The disclosure provides an audio signal processing circuit and an audio signal processing method, adapted for processing the input signal of a speaker configured with a rated power. The audio signal processing circuit includes, but not limited to, an audio signal generator and a power adjuster. The audio signal generator provides an audio signal including a high-frequency signal and a middle and low-frequency signal. The power adjuster is electronically coupled to the audio signal generator, and adjusts the power of the high-frequency signal according to an enhanced power larger than the rated power without adjusting the power of the middle and low-frequency signal. The output signal of the power adjuster can be inputted into the speaker. Accordingly, the transmission range for the high-frequency signal can be improved.

Abstract: A correction system and a correction method of signal measurement are provided. In the method, a transmitted signal and a received signal are divided into a plurality of transmitted signal groups and a plurality of received signal groups according to a time length, respectively. The received signal is related to a signal received after the transmitted signal is transmitted, and the transmitted signal is a periodic signal. A plurality of to-be-evaluated groups are selected from the received signal groups according to a correlation between the transmitted signal groups and the received signal groups. The correlation corresponds to a delay between the transmitted signal and the received signal. The signal energy of the received signal is determined according to the signal energy of the to-be-evaluated groups. Accordingly, the accuracy of signal measurement can be improved.

Abstract: An adjusting system and an adjusting method for equalization processing are provided. Frequency band energies of sound receiving signals are obtained. The frequency band energies correspond to different frequency bands, respectively. Target gains corresponding to frequency bands are determined according to the frequency band energies. Frequency responses of filtering processing with respect to a plurality of center frequencies are obtained. Equalization gains corresponding to the frequency bands and having the least gain error are determined. The gain error is related to a difference between the amplitude obtained after the equalization gains are reflected on the frequency responses corresponding to the filtering processing and the target gains. The equalization gains are inputted into the filtering processing according to the corresponding frequency bands. Accordingly, the impact of the filtering processing can be reduced.

Abstract: A correction system and a correction method of signal measurement are provided. In the method, a transmitted signal and a received signal are divided into a plurality of transmitted signal groups and a plurality of received signal groups according to a time length, respectively. The received signal is related to a signal received after the transmitted signal is transmitted, and the transmitted signal is a periodic signal. A plurality of to-be-evaluated groups are selected from the received signal groups according to a correlation between the transmitted signal groups and the received signal groups. The correlation corresponds to a delay between the transmitted signal and the received signal. The signal energy of the received signal is determined according to the signal energy of the to-be-evaluated groups. Accordingly, the accuracy of signal measurement can be improved.

Abstract: A sound effect controlling method and a sound outputting device with dynamic gain adjustment are disclosed. The sound effect controlling method includes the following steps. An original left sound signal and an original right sound signal are transformed to a virtual center sound signal, a virtual left sound signal, a virtual left surrounding sound signal, a virtual right surrounding sound signal and a virtual right sound signal according to a center gain, a left gain, a left surrounding gain, a right surrounding gain and a right gain, which are calculated according to a rotation angle and a dual sound relationship. An updated left sound signal and an updated right sound signal are obtained according to the virtual center sound signal, the virtual left sound signal, the virtual left surrounding sound signal, the virtual right surrounding sound signal and the virtual right sound signal.

Abstract: A speaker adjustment method for adjusting a plurality of speakers is provided. The speaker adjustment method includes the following steps: respectively obtaining a plurality of frequency responses of the plurality of speakers by using one microphone; obtaining distance information between the microphone and the plurality of speakers; and adjusting outputs of the plurality of speakers according to the plurality of frequency responses and the distance information. In addition, an electronic device using the speaker adjustment method is also provided.

Abstract: A Finite Impulse Response (FIR) filter is configured to minimize delay and maximize passband power by adjusting the filter coefficients applied to the sampled values. The FIR filter obtains an input signal and samples the input signal to generate a set of sampled input values. The FIR filter generates a set of filter coefficients, with each filter coefficient based on a corresponding sampled input value in the set of sample input values. The FIR filter selects a subset of sampled input values that have been most recently sampled from the input signal, and selects a subset of filter coefficients corresponding to sampled input values that are not the most recently sampled. The subset of sampled input values is combined with the subset of filter coefficients to generate an output value for the FIR filter.

Abstract: A speaker adjustment method for adjusting a plurality of speakers is provided. The speaker adjustment method includes the following steps: respectively obtaining a plurality of frequency responses of the plurality of speakers by using one microphone; obtaining distance information between the microphone and the plurality of speakers; and adjusting outputs of the plurality of speakers according to the plurality of frequency responses and the distance information. In addition, an electronic device using the speaker adjustment method is also provided.

Abstract: An electronic device including a sound receiver and a processor is provided. The sound receiver receives a sound signal provided by a sound generator. When the processor determines that an obstacle is blocked between the electronic device and the fixed device, the processor estimates a virtual position of the electronic device at a current time according to previous movement information and a previous position of the electronic device. The virtual position has a shortest path between a boundary position of the obstacle and the sound generator. The processor obtains a first relative distance between the electronic device and the boundary position according to the sound signal received by the sound receiver and the boundary position. The processor calculates a relative velocity and a relative acceleration of the electronic device relative to the fixed device at the current time according to the sound signal and the first relative distance.

Abstract: A speaker adjustment method applicable to an electronic device including two microphones and two speakers is provided. The speaker adjustment method includes the following steps: obtaining two first frequency responses corresponding the two speakers by using one microphone, and obtaining two second frequency responses corresponding the two speakers by using another microphone; calculating a sensitivity difference between the two microphones according to the two first frequency responses and the two second frequency responses, where a distance ratio of distances from the two microphones to one speaker equals to a distance ratio of distances from the two microphones to another speaker; and adjusting outputs of the two speakers according to the sensitivity difference, at least one of the first frequency responses and at least one of the second frequency responses. In addition, an electronic device using the speaker adjustment method is also provided.

Abstract: A sound effect controlling method and a sound outputting device with orthogonal base correction are provided. The sound effect controlling method includes the following steps. Firstly, 6 or 8 initial sound signals are generated according to an original left sound signal and an original right sound signal. Next, a first gain is calculated according to a rotation angle and a first axial angle, and a second gain is calculated according to the rotation angle and a second axial angle, wherein the first axial angle and the second axial angle are orthogonal. Lastly, a modified left sound signal and a modified right sound signal are obtained according to the first gain and the second gain.

Abstract: A method and a system for correcting energy distributions of audio signal are proposed. The method is applicable to a head-mounted device having a motion sensor, a left speaker, and a right speaker and includes the following steps. A rotation angle of the head-mounted device is detected by the motion sensor. Dual-channel audio signals corresponding to the left and right speakers are obtained. The dual-channel audio signals are converted to multi-channel audio signals with the number of channels greater than or equal to 5. Four acoustic source positions of the left and right speakers are defined to convert the multi-channel audio signals to four-channel audio signals of the left and right speakers. Energy distributions of the four-channel audio signals of the left and right speakers are corrected according to the rotation angle and the four acoustic source positions to respectively generate a left output signal and a right output signal.

Abstract: A sound effect controlling method and a sound outputting device with orthogonal base correction are provided. The sound effect controlling method includes the following steps. Firstly, 6 or 8 initial sound signals are generated according to an original left sound signal and an original right sound signal. Next, a first gain is calculated according to a rotation angle and a first axial angle, and a second gain is calculated according to the rotation angle and a second axial angle, wherein the first axial angle and the second axial angle are orthogonal. Lastly, a modified left sound signal and a modified right sound signal are obtained according to the first gain and the second gain.

Abstract: A sound effect controlling method and a sound outputting device with dynamic gain adjustment are disclosed. The sound effect controlling method includes the following steps. An original left sound signal and an original right sound signal are transformed to a virtual center sound signal, a virtual left sound signal, a virtual left surrounding sound signal, a virtual right surrounding sound signal and a virtual right sound signal according to a center gain, a left gain, a left surrounding gain, a right surrounding gain and a right gain, which are calculated according to a rotation angle and a dual sound relationship. An updated left sound signal and an updated right sound signal are obtained according to the virtual center sound signal, the virtual left sound signal, the virtual left surrounding sound signal, the virtual right surrounding sound signal and the virtual right sound signal.

Abstract: A sound outputting device, a processing device and a sound controlling method thereof are provided. The sound controlling method includes the following steps. An original left sound signal and an original right sound signal are received. The original left sound signal and the original right sound signal are transformed to be a virtual left sound signal and a virtual right sound signal of a virtual sound source. A rotation degree of a user is detected. The virtual left sound signal and the virtual right sound signal are transformed to be an updated left sound signal and an updated right sound signal.

Abstract: An electronic device including a sound receiver and a processor is provided. The sound receiver receives a sound signal provided by a sound generator. When the processor determines that an obstacle is blocked between the electronic device and the fixed device, the processor estimates a virtual position of the electronic device at a current time according to previous movement information and a previous position of the electronic device. The virtual position has a shortest path between a boundary position of the obstacle and the sound generator. The processor obtains a first relative distance between the electronic device and the boundary position according to the sound signal received by the sound receiver and the boundary position. The processor calculates a relative velocity and a relative acceleration of the electronic device relative to the fixed device at the current time according to the sound signal and the first relative distance.

Abstract: A voice signal processing apparatus and a voice signal processing method are provided. Adjust a consonant signal judgment condition of a target voice frame according to whether an original voice sampling signal corresponding to a previous voice frame adjacent to the target voice frame is a consonant signal, so as to improve comfort of listening to the sound and recognition of a voice signal.

Abstract: A method for dynamically adjusting recovery time in wide dynamic range compression (WDRC) for use in a hearing aid is provided. The method includes the steps of: receiving an input signal via the hearing aid; applying a band-pass filter on the input acoustic signal to calculate a high-energy ratio; calculating an over-zero rate ratio corresponding to the input acoustic signal; calculating a consonant occurring probability according to the high-frequency energy ratio and the over-zero rate ratio; applying a consonant determination mechanism on the input acoustic signal, and adjusting the consonant occurring probability according to the results of the consonant determination mechanism; calculating a recovery time factor corresponding to the input acoustic signal according to the adjusted consonant occurring probability; and performing a WDRC process on the input acoustic signal according to the recovery time factor to generate an output acoustic signal.

Abstract: A distance detection device and a distance detection method thereof are provided. A second time at which a packet amplitude peak of a preset sound signal is received by a sound receiver is estimated according to a time difference between the preset sound signal and a low pass filter signal thereof. A distance between a speaker and the sound receiver is calculated according to the second time.

Abstract: A voice signal processing apparatus and a voice signal processing method are provided. A filtering loudness gain of a filter signal of each frequency band is adjusted according to a wide dynamic range compression curve without an upper output loudness limit. The filtering loudness gain of each frequency band is reduced by lowering a gain decrease adjustment value, so as to reduce a loudness of a loudness adjusted filter signal, and thus a loudness of an output voice signal is lower than a first threshold value.