32 results about "Loudness compensation" patented technology

Audio signal processing relating to the measurement and control of the perceived sound loudness and / or the perceived spectral balance of an audio signal is useful, for example, in one or more of: loudness-compensating volume control, automatic gain control, dynamic range control (including, for example, limiters, compressors, expanders, etc.), dynamic equalization, and compensating for background noise interference in an audio playback environment. In various embodiments, modification parameters are derived for modifying the audio signal in order to reduce the difference between its specific loudness and a target specific loudness.

A speech correction apparatus includes a speaker for generating guidance speech; a microphone set at a hearing position; an acoustic-characteristic setting unit for separating ambient noise from the guidance speech at the hearing position; an operating unit; a speech correcting filter for correcting the sound pressure level of the guidance speech generated by the speaker based on the average power of the guidance speech and the average power of the ambient noise which are separated; a loudness-compensating-gain calculating unit; and a speech-head correcting unit for correcting the average power of the guidance speech corresponding to the speech head at the border between a silent state and a speech state of the guidance speech.

The invention provides a volume-based personalized loudness compensation method and an earphone equalization system. The invention provides a method including: by playing a burst sound reference signal and a burst sound test signal at each selected volume, adjusting the gain of each burst sound test signal to make its loudness equal to that of the burst sound reference signal, obtaining a loudnessgain curve at each volume, and correcting and interpolating the loudness gain curve by using a universal iso-loudness curve to form a gain continuous amplitude response curve; and generating the earphone equalization curve by amplitude response curve to compensate the loudness of the audio signal. By using the method and the earphone equalization system provided by the invention, the earphone loudness equalization curve under different volume can be obtained, and the equalization curve is obtained by adjusting the loudness gain of the signal by the user, so as to compensate for the problem ofinsensitive frequency band hearing feeling generated by playback audio under different sound pressure levels, and provide better earphone auditory experience for the user.

The invention discloses a channel-adaptive digital hearing aid wide dynamic range compression method. First, an asymmetric filter bank decomposition and synthesis algorithm is selected by simulating the hearing characteristics of the human ear, and then the filter is designed according to the patient's audiogram and a psychoacoustic model. The number of channels and parameters of the filter group can be used to obtain a personalized filter bank that meets the hearing loss of the patient; finally, the digital hearing aid using the above method performs wide dynamic range compression on the input sound signal sub-channels; the specific steps of compression include: automatically compressing the input signal The adaptive channel filter bank is decomposed to obtain the signal of the adaptive channel; the loudness compensation is performed on each channel signal after decomposition; the filter bank synthesis is performed on the compensated channel signal to obtain a full-band signal; the integrated full-band signal is The signal is converted to an audio signal output. While meeting the performance requirements, the computational complexity of the system is reduced, and the patient's speech intelligibility is improved.