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 method for regulating a sound source of a designated object and an audio processing device using same are provided. The method includes the following steps. An original two-channel signal is obtained. An included angle of the designated object with respect to an ear of a user is detected. A first beam and a second beam are respectively formed in a clockwise direction and a counterclockwise direction according to the included angle to obtain a bidirectional sound signal. A sound rotation process is performed, so that the ear is directed toward sound source of the designated object, and a rotated two-channel sound signal is obtained. A unidirectional sound signal towards the sound source is obtained. A sound signal characteristic of the designated object is obtained according to the bidirectional sound signal and the unidirectional sound signal and then is regulated to synthesize a regulated two-channel signal.

Abstract: A two-channel balance method and an electronic device using the same are provided. The two-channel balance method includes the following steps. A gain-frequency information of a two-channel signal is adjusted. A sampling delay information of the two-channel signal is calculated according to a distance information among a sound receiving unit, a left speaker unit and a right speaker unit. A forward test audio file or a surround test audio file is generated according to the sampling delay information. A phase offset information is estimated according to at least the forward test audio file or the surround test audio file. A phase offset direction information is determined. A phase information of the two-channel signal is adjusted according to the phase offset information and the phase offset direction information.

Abstract: A method for eliminating a specific object voice and an ear-wearing audio device using the same are provided. The ear-wearing audio device includes a plurality of voice receiving units, a voice direction tracking unit, a direction enhancement unit, a window cutting unit, a voiceprint recognition unit, a voice cancellation unit and two speakers. The voice receiving units are arranged in an array to obtain a sound signal. The voice direction tracking unit is configured to track a plurality of sound sources to obtain a plurality of sound source directions. The voiceprint recognition unit determines whether the sound signal contains a specific object voice in each of the sound source directions. If the sound signal contains the specific object voice in one of the sound source directions, the voice cancellation adjusts a field pattern using a beamforming technique to eliminate the specific object voice.

Abstract: A specific sound source automatic adjusting method and an electronic device using the same are provided. The electronic device includes a first audio recognition unit, a first multi-sound source determination unit, a directivity analysis unit, a directional separation unit, a second audio recognition unit, a second multi-sound source determination unit and an audio adjustment unit. If the number of sound sources of the original sound signal is larger than or equal to 2, the directivity analysis unit performs a directionality analysis procedure on the original sound signal. The directional separation unit separates out at least one specific directional sub-signal from the original sound signal according to the result of directional analysis procedure. If the number of sound sources of the specific directional sub-signal is equal to 1, the audio adjustment unit performs a sound source adjustment procedure.

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: A method for regulating a sound source of a designated object and an audio processing device using same are provided. The method includes the following steps. An original two-channel signal is obtained. An included angle of the designated object with respect to an ear of a user is detected. A first beam and a second beam are respectively formed in a clockwise direction and a counterclockwise direction according to the included angle to obtain a bidirectional sound signal. A sound rotation process is performed, so that the ear is directed toward sound source of the designated object, and a rotated two-channel sound signal is obtained. A unidirectional sound signal towards the sound source is obtained. A sound signal characteristic of the designated object is obtained according to the bidirectional sound signal and the unidirectional sound signal and then is regulated to synthesize a regulated two-channel signal.

Abstract: A method for eliminating a specific object voice and an ear-wearing audio device using the same are provided. The ear-wearing audio device includes a plurality of voice receiving units, a voice direction tracking unit, a direction enhancement unit, a window cutting unit, a voiceprint recognition unit, a voice cancellation unit and two speakers. The voice receiving units are arranged in an array to obtain a sound signal. The voice direction tracking unit is configured to track a plurality of sound sources to obtain a plurality of sound source directions. The voiceprint recognition unit determines whether the sound signal contains a specific object voice in each of the sound source directions. If the sound signal contains the specific object voice in one of the sound source directions, the voice cancellation adjusts a field pattern using a beamforming technique to eliminate the specific object voice.

Abstract: A specific sound source automatic adjusting method and an electronic device using the same are provided. The electronic device includes a first audio recognition unit, a first multi-sound source determination unit, a directivity analysis unit, a directional separation unit, a second audio recognition unit, a second multi-sound source determination unit and an audio adjustment unit. If the number of sound sources of the original sound signal is larger than or equal to 2, the directivity analysis unit performs a directionality analysis procedure on the original sound signal. The directional separation unit separates out at least one specific directional sub-signal from the original sound signal according to the result of directional analysis procedure. If the number of sound sources of the specific directional sub-signal is equal to 1, the audio adjustment unit performs a sound source adjustment procedure.

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: 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: 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 head-mounted display apparatus and an acoustic device disposed in the head-mounted display apparatus are provided. The acoustic device includes a speaker, a resonance box, and a waveguide. The resonance box is connected to the speaker. The waveguide is connected to the resonance box. The volume of the waveguide is greater than twice the volume of the speaker, and the length of the waveguide is greater than 5 times the thickness of the speaker.

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.