Abstract: An apparatus and method of excursion protection of a loudspeaker. The method includes attenuating selected bands in a transform domain, controlled by a feedback signal resulting from an excursion transfer function that has been modified according to the real-time operational characteristics of the loudspeaker. In this manner, the system reduces the amount of wideband attenuation needed to address the predicted excursion, resulting in a better listening experience.

Abstract: An apparatus and method of excursion protection of a loudspeaker. The method includes attenuating selected bands in a transform domain, controlled by a feedback signal resulting from an excursion transfer function that has been modified according to the real-time operational characteristics of the loudspeaker. In this manner, the system reduces the amount of wideband attenuation needed to address the predicted excursion, resulting in a better listening experience.

Abstract: An audio reproduction method and apparatus, in which an audio volume is automatically controlled based on audio energy and human auditory characteristics. The audio reproduction method includes splitting a reproduction audio signal into audio signals corresponding to a plurality of frequency bands, extracting audio energy for each of the frequency bands, and comparing the audio energy for each of the frequency bands with a predetermined threshold and controlling the volume of the audio signal corresponding to each of the frequency bands.

Abstract: An audio reproduction method and apparatus, in which an audio volume is automatically controlled based on audio energy and human auditory characteristics. The audio reproduction method includes splitting a reproduction audio signal into audio signals corresponding to a plurality of frequency bands, extracting audio energy for each of the frequency bands, and comparing the audio energy for each of the frequency bands with a predetermined threshold and controlling the volume of the audio signal corresponding to each of the frequency bands.

Abstract: A method of measuring and improving acoustic properties, and a recording medium and a music reproduction apparatus that are suitable for the method. The method includes reproducing and outputting an analysis signal stored in codec file types, recording the output analysis signal in the codec file types, obtaining an impulse response by performing convolution on the recorded signal and an inverse signal of the analysis signal, and correcting frequency properties based on the impulse response. By storing a signal that is supposed to be generated by a signal generation device in codec file types, it is possible to implement the signal in a music reproduction apparatus without a need for the signal generation device. By correcting frequency property, the music reproduction apparatus can improve the performance of an output acoustic signal close to that of an original sound.

Abstract: A method of measuring and improving acoustic properties, and a recording medium and a music reproduction apparatus that are suitable for the method. The method includes reproducing and outputting an analysis signal stored in codec file types, recording the output analysis signal in the codec file types, obtaining an impulse response by performing convolution on the recorded signal and an inverse signal of the analysis signal, and correcting frequency properties based on the impulse response. By storing a signal that is supposed to be generated by a signal generation device in codec file types, it is possible to implement the signal in a music reproduction apparatus without a need for the signal generation device. By correcting frequency property, the music reproduction apparatus can improve the performance of an output acoustic signal close to that of an original sound.

Abstract: A method and apparatus to post process an audio signal. The method includes selecting one of a plurality of audio signal processing modes classified based on at least one of timbre, sound intensity, and rhythm of the audio signal, and modifying at least one of the timbre, the sound intensity, and the rhythm of the audio signal based on the selected audio signal processing mode.

Abstract: A method and an apparatus to adjust a phase of a subwoofer channel signal in order to compensate for a phase difference generated at a crossover point between a subwoofer response and a main speaker response. The method includes: measuring a first response characteristic of a signal output from the subwoofer, a second response characteristic of a signal output from the main speaker, and a third response characteristic of a test signal simultaneously output from the subwoofer and the main speaker, detecting a phase difference between the subwoofer and the main speaker according to a difference value between the first, second, and third response characteristics at a crossover frequency, calculating a delay value of the subwoofer according to the detected phase difference, and compensating for the detected phase difference at the crossover point between the subwoofer and the main speaker using the calculated delay value of the subwoofer.

Abstract: A method and apparatus to evaluate sound quality by measuring physical characteristics of an audio system according to one or more measuring modes. The method includes selecting one of an anechoic mode or a room mode as a measuring mode, measuring physical sound characteristics generated by the audio system according to the selected measuring mode, extracting a plurality of sound quality factors including one or more corresponding evaluation items according to the measured physical sound characteristics, mapping the plurality of extracted sound quality factors using scores set according to predetermined values for the evaluation items obtained from a group of sound quality evaluators, and scoring the corresponding evaluation items of the mapped plurality of sound quality factors by adding predetermined weighting factors to the corresponding evaluation items of the mapped sound quality factors, and displaying the scored corresponding evaluation items on a screen with the measuring mode.

Abstract: A method and apparatus to compensate for imperfections in a sound field includes determining a frequency-response characteristic of a test signal, extracting a difference spectrum by filtering the frequency-response characteristic on different octave band scales, detecting frequency parameters of peak and dip components that deviate from a critical value in the difference spectrum, and calculating filter coefficients from the frequency parameters to filter an input audio signal.