摘要:
Systems and methods for isolating audio content and biometric authentication include receiving, with an audio receiver, an audio signal spanning a plurality of frequency bands, identifying a speech signal carried by a voice frequency band selected from the plurality of frequency bands, enhancing the speech signal relative to other audio content within the audio signal, and extracting a voice profile key that uniquely identifies the speech signal.
摘要:
Systems and methods described herein modify audio content on an electronic device. Embodiments can be configured to detect a mode of the electronic device to determine whether the device is in a telephone mode; receive a speech signal from a speech source while the device is in the telephone mode; and process the speech signal to improve the perceived quality of the speech at a recipient when the electronic device is in a telephone mode; wherein processing the speech signal to improve the perceived quality of the speech comprises, decreasing the signal level of audio content outside of a determined frequency band relative to the signal level of the audio content within the determined frequency band; and wherein the determined frequency band is a frequency band associated a vocal range of the anticipated speech content.
摘要:
A low-frequency eliminating unit outputs a signal derived from attenuating the extreme bass range in an input audio signal, so as to reduce bass distortion. A high-frequency retrieving unit retrieves, from the signal output from the low-frequency eliminating unit, signal components at frequencies higher than the marginal frequency. A front low-pass filter and a back low-pass filter retrieve, from the signal output from the low-frequency eliminating unit, components other than the signal retrieved by the high-frequency retrieving unit. An amplifying unit amplifies a signal output from the low-frequency retrieving unit. A synthesizing unit synthesizes a signal output from the high-frequency retrieving unit and a signal output from the amplifying unit.
摘要:
Sound picked up by a microphone of a first sound field is reproduced by a speaker of a second sound field, and a sound picked up by a microphone of the second sound field is reproduced by the speaker of the first sound field. Sound pressure detection section detects a sound pressure of a sound present in the second (or first) sound field picked up by the microphone of the second (or first) sound field, other than a sound reproduced by the speaker of the first (or second) sound field. Other sound pressure detection section detects a sound pressure with which the sound picked up by the microphone of the second (or first) sound field and reproduced by the speaker of the first (or second) sound field is picked up by the microphone of the first (or second) sound field. Sound-pressure-difference detection section adjusts a gain of an automatic gain adjustment section in such a manner that the two detected sound pressures assume a predetermined relationship. Thus, any sound picked up in one of the first and second sound fields can be reproduced in the other sound field with an enhanced sense of unity and connection between the two sound fields.
摘要:
The object of this invention is to obtain the optimum music level by separately and independently performing the sound correction for the high-frequency range and low-frequency range according to the noise level. The invention comprises: a memory unit in which high-frequency-correction-level information, corresponding to the vehicle speed and music level, and low-frequency-correction-level information, corresponding to the low-frequency noise/music level ratio, are stored; a high-frequency-correction-level-information-acquisition unit that obtains high-frequency-correction-level information based on the vehicle speed and music level; and a low-frequency-correction-level-information-acquisition unit that obtains low-frequency-correction-level information based on the low-frequency noise/music level ratio; and it corrects the sound by a sound-quality-adjustment unit based on the high-frequency-correction-level information and low-frequency-correction-level information.
摘要:
An AM receiver includes an audio filter that is configured to selectively narrow the audio bandwidth of the demodulated signal when a signal with a low signal-to-noise ratio is received. By suitably bandpass-filtering the signal, for example, to 200–5000 Hertz, the intelligibility of the demodulated audio signal is not substantially reduced, whereas this bandpass-filtering substantially suppresses the audio noise that is typically found to be most annoying when listening to an full-bandwidth audio signal with a low signal-to-noise ratio. Optionally, the audio filter also provides gain to the bandpass-filtered signal.
摘要:
An audio apparatus is constructed for use in negative drive of a loudspeaker having an internal impedance to perform a desired amplitude-frequency characteristic. In the audio apparatus, an amplifier device drives the loudspeaker with a driving voltage. A feedback device performs a positive feedback of a signal corresponding to the driving voltage of the loudspeaker to the amplifier device with a variable feedback gain, thereby causing the amplifier device to generate a negative impedance effective to negate the internal impedance of the loudspeaker. An adjustment device decreases the variable feedback gain of the feedback device as a level of the driving voltage of the loudspeaker increases, thereby adjusting the amplitude-frequency characteristic of the amplifier device.
摘要:
The object of this invention is to obtain the optimum music level by separately and independently performing the sound correction for the high-frequency range and low-frequency range according to the noise level. The invention comprises: a memory unit in which high-frequency-correction-level information, corresponding to the vehicle speed and music level, and low-frequency-correction-level information, corresponding to the low-frequency noise/music level ratio, are stored; a high-frequency-correction-level-information-acquisition unit that obtains high-frequency-correction-level information based on the vehicle speed and music level; and a low-frequency-correction-level-information-acquisition unit that obtains low-frequency-correction-level information based on the low-frequency noise/music level ratio; and it corrects the sound by a sound-quality-adjustment unit based on the high-frequency-correction-level information and low-frequency-correction-level information.
摘要:
A method of acoustically correct boosting of the bass level of a playback system for audio signals by adjusting at least one filter parameter of at least one bass-boosting filter unit which is provided for the playback system and is assigned in particular to at least one digital equalizer that is provided with the playback system so that excessive boosting of bass level is prevented is described. This involves adjusting at least one filter parameter of the bass-boosting filter unit so that the boost in the bass level is reduced with an increase in the cut-off frequency and/or with an increase in the mid-frequency of the bass-boosting filter unit such that the isophones in the remaining reproducible bass frequency range are not exceeded.
摘要:
An audio device, for example a wireless communications handset, including a sound transducer (410) coupled to a compensated audio signal output of an audio compensator (450), a mismatch detection circuit (430) having a first input coupled to the compensated audio signal output of the audio compensator (450), the mismatch detection circuit (430) having a second input coupled to the sound transducer (410), the mismatch detecting circuit having an output corresponding to a mismatch between a reference electrical impedance of the sound transducer and an actual electrical impedance of the sound transducer, a compensation estimator (440) having an input coupled to the output of the mismatch detection circuit, the compensation estimator having an audio compensation output coupled to a compensation input of the audio compensator.