Noise

About: Noise is a research topic. Over the lifetime, 5111 publications have been published within this topic receiving 69407 citations. The topic is also known as: Мопсы танцуют под радио бандитов из сталкера 10 часов.

Voice-activated switch

Abstract: Human speech is detected in an audio signal by first providing a single autocorrelated signal indicative of the audio signal multiplied by a time-delayed portion of the audio signal, the delay being an amount of time indicative of a period corresponding to a first formant frequency. Portions of the autocorrelated signal are compared with a scaled noise value. Human speech is detected by examining whether a plurality of portions of the autocorrelated signal exceed the scaled noise value.

Method for generating bit stream and method for recording information

Abstract: PROBLEM TO BE SOLVED: To provide a method and device for interleaving bit stream by which multimedia data including digital picture data, audio data, and sub-video data are seamless-reproduced by smoothly switching videos and voices to each other without disturbing videos, allowing noise to be contained in voices, and discontinuing voices at angle switching sections during multi-angle reproduction from an optical disk on which multi-media data are recorded. SOLUTION: A multi-angle system stream is constituted of a plurality of system streams composed of picture data and audio data created at different viewing points. In the multi-angle system stream from which a system stream corresponding to an angle can be reproduced at every predetermined unit by freely switching the system stream to another during reproduction, the display time of picture data contained in the system stream corresponding to an angle and the display time of audio data are made equal to each other for every angle at every prescribed unit at which the angle can be switched.

Automatic volume control circuit

Abstract: An electronic circuit for automatically adjusting the volume of an audio program in accordance with changes in the magnitude of ambient noise is disclosed A voltage signal is generated which is proportional to the magnitude of the ambient noise The voltage signal is applied to the cathode of a diode The anode of the diode is connected through a capacitor to ground potential The anode of the diode is also connected to a variable resistance device, which controls the volume of the audio program in accordance with the voltage across the capacitor When the magnitude of the ambient noise increases, the capacitor is slowly charged by the leakage current passing through the reversed biased diode As a result, the volume of the audio program is slowly increased When the magnitude of such noise decreases, the capacitor is rapidly discharged through the forward biased diode Thus, the volume of the audio program is rapidly decreased

Beneficial acoustic speech cues for cochlear implant users with residual acoustic hearing

Abstract: This study investigated which acoustic cues within the speech signal are responsible for bimodal speech perception benefit. Seven cochlear implant (CI) users with usable residual hearing at low frequencies in the non-implanted ear participated. Sentence tests were performed in near-quiet (some noise on the CI side to reduce scores from ceiling) and in a modulated noise background, with the implant alone and with the addition, in the hearing ear, of one of four types of acoustic signals derived from the same sentences: (1) a complex tone modulated by the fundamental frequency (F0) and amplitude envelope contours; (2) a pure tone modulated by the F0 and amplitude contours; (3) a noise-vocoded signal; (4) unprocessed speech. The modulated tones provided F0 information without spectral shape information, whilst the vocoded signal presented spectral shape information without F0 information. For the group as a whole, only the unprocessed speech condition provided significant benefit over implant-alone scores, in both near-quiet and noise. This suggests that, on average, F0 or spectral cues in isolation provided limited benefit for these subjects in the tested listening conditions, and that the significant benefit observed in the full-signal condition was derived from implantees' use of a combination of these cues.

Removal of audio noise

Abstract: A system for removing noise from an audio signal is described. For example, noise caused by content playing in the background during a voice command or phone call may be removed from the audio signal representing the voice command or phone call. By removing noise, the signal to noise ratio of the audio signal may be improved.