Patent application number | Description | Published |
20090055173 | SUB BAND VAD - The present invention relates to a voice detector being responsive to an input signal being divided into sub-signals representing a frequency sub-band, comprising: means to calculate, for each sub-band, an SNR value snr[n] based on a corresponding sub-signal for each sub-band and a background signal for each sub-band. The voice detector further comprises: means to calculate a power SNR value for each sub-band, wherein at least one of said power SNR values is calculated based on a non-linear function, means to form a single value snr_sum based on the calculated power SNR values, and means to compare said single value snr_sum and a given threshold value vad_thr to make a voice activity decision vad_prim presented on an output port. The invention also relates to a voice activity detector, a node and a method for selectively suppressing sub-bands in a voice detector. | 02-26-2009 |
20100106490 | Method and Speech Encoder with Length Adjustment of DTX Hangover Period - The present invention relates to a speech encoder comprising: a voice activity detector (VAD) configured to receive speech frames and to generate a speech decision (VAD_flag), a speech/SID encoder configured to receive said speech frames and to generate a signal identifying speech frames based on the encoder decision (SP), which in turn is based on the speech decision (VAD_flag) and a DTX-hangover period, and a SID-synchronizer configured to transmit a signal (TxType) comprising speech frames, SID frames and No_data frames. The speech encoder further comprises: a signal analyzer configured to analyze energy values of speech frames within the DTX-hangover period, and a DTX-handler configured to adjust the length of the DTX-hangover period in response to the analysis performed by the signal analyzer. The invention also relates to a method for estimating the characteristic of a DTX-hangover period in a speech encoder. | 04-29-2010 |
20100211385 | IMPROVED VOICE ACTIVITY DETECTOR - The present invention relates to a voice activity detector (VAD) comprising at least a first primary voice detector. The voice activity detector is configured to output a speech decision “vad_flag” indicative of the presence of speech in an input signal based on at least a primary speech decision “vad_prim_A” produced by said first primary voice detector. The voice activity detector further comprises a short term activity detector and the voice activity detector is further configured to produce a music decision “vad_music” indicative of the presence of music in the input signal based on a short term primary activity signal αvad_act_prim_A″ produced by said short term activity detector based on the primary speech decision “vad_prim_A” produced by the first voice detector. The short term primary activity signal “vad_act_prim_A” is proportional to the presence of music in the input signal. The invention also relates to a node, e.g. a terminal, in a communication system comprising such a VAD. | 08-19-2010 |
20110224994 | Energy Conservative Multi-Channel Audio Coding - The invention relates to the technical field of audio encoding and/or decoding technologies, and thus concerns an overall encoding procedure and associated decoding procedure. The encoding procedure involves at least two signal encoding processes (S | 09-15-2011 |
20110264449 | Detector and Method for Voice Activity Detection - The embodiments of the present invention relates to a voice activity detector and a method thereof. The voice activity detector is configured to detect voice activity in a received input signal comprising an input section configured to receive a signal from a primary voice detector of said VAD indicative of a primary VAD decision and at least one signal from at least one external VAD indicative of a voice activity decision from the at least one external VAD, a processor configured to combine the voice activity decisions indicated in the received signals to generate a modified primary VAD decision, and an output section configured to send the modified primary VAD decision to a hangover addition unit of said VAD. | 10-27-2011 |
20120209604 | Method And Background Estimator For Voice Activity Detection - The present invention relates to a method and a background estimator in voice activity detector for updating a background noise estimate for an input signal. The input signal for a current frame is received and it is determined whether the current frame of the input signal comprises non-noise. Further, an additional determination is performed whether the current frame of the non-noise input comprises noise by analyzing characteristics at least related to correlation and energy level of the input signal, and background noise estimate is updated if it is determined that the current frame comprises noise. | 08-16-2012 |
20120215536 | Methods and Voice Activity Detectors for Speech Encoders - Voice activity detectors are related methods are provided. Methods include receiving a frame of the input signal; determining a first SNR of the received frame; comparing the determined first SNR with an adaptive threshold; and detecting whether the received frame comprises voice based on the comparison. The adaptive threshold is at least based on total noise energy of a noise level, an estimate of a second SNR and on energy variation between different frames. | 08-23-2012 |