초록 ▼

A source width estimation system may estimate an auditory source width of a sound. The system detects a first frequency modulated noise signal and a second frequency modulated noise signal. The detected noise signals may be processed to obtain an average value of a lateral width of a binaural activi

A source width estimation system may estimate an auditory source width of a sound. The system detects a first frequency modulated noise signal and a second frequency modulated noise signal. The detected noise signals may be processed to obtain an average value of a lateral width of a binaural activity over time and a plurality of sub-bands. The auditory source width of the noise signals may be determined from the average value of the lateral width of the binaural activity.

대표청구항 ▼

1. A method, comprising: detecting a first frequency modulated noise signal and a second frequency modulated noise signal;filtering the detected noise signals to obtain sub-band signals for a plurality of sub-bands; determining a binaural activity over time and a lateral width for each of the plural

1. A method, comprising: detecting a first frequency modulated noise signal and a second frequency modulated noise signal;filtering the detected noise signals to obtain sub-band signals for a plurality of sub-bands; determining a binaural activity over time and a lateral width for each of the plurality of sub-bands; determining an average value of the lateral width of the binaural activity over time and the plurality of sub-bands;determining an auditory source width of the noise signals based on the average value of the lateral width of the binaural activity; andcutting the binaural activity at one or more edges by applying a cutting function with an adaptive threshold, and where the act of determining the auditory source width comprises determining the auditory source width of the noise signals based on the edge-cut binaural activity. 2. The method of claim 1, where the act of filtering comprises filtering the detected noise signals by a non-uniform auditory bandpass filter bank to obtain the sub-band signals. 3. The method of claim 1, where the act of filtering comprises: filtering the detected noise signals by a head-related transfer function; andprocessing output of the head-related transfer function with a non-uniform auditory bandpass filter bank to obtain the sub-band signals. 4. The method of claim 1, where the act of filtering comprises: processing the detected signals in a way that corresponds to physiologic filtering of a human outer ear to obtain first filtered signals;processing the first filtered signals in a way that corresponds to physiologic filtering of a human middle car to obtain second filtered signals; andprocessing the second filtered signals with a non-uniform auditory bandpass filter bank to obtain the sub-band signals. 5. The method of claim 1, where the act of determining the binaural activity over time and the lateral width comprises: determining interaural time differences and interaural level differences of the sub-band signals; andcombining the interaural time differences and the interaural level, differences to obtain the binaural activity over time and the lateral width for each of the plurality of sub-bands. 6. The method of claim 5, further comprising half-wave rectifying and low-pass filtering the sub-band signals to obtain half-wave rectified sub-band signals; where the act of determining the interaural time differences and the interaural level differences comprises determining the interaural time differences and the interaural level differences of the half-wave rectified sub-band signals. 7. The method of claim 1, where the act of detecting the first and second noise signals comprises binaurally detecting the first and second noise signals through a plurality of sound detection devices installed in artificial ears of a dummy head. 8. The method of claim 1, where the first and second noise signals represent broadband noises including sinusoidally varying interaural time differences. 9. The method of claim 8, where the first and second noise signals are generated according to: l⁡(t)=∑i=1N⁢A⁢⁢sin⁡(2⁢π⁢⁢fi⁢tFs+θi+π⁢⁢fi⁢Δ⁢⁢t⁢⁢sin⁡(2⁢πFM⁢tFs))r⁡(t)=∑i=1N⁢A⁢⁢sin⁢⁢(2⁢π⁢⁢fi⁢tFs+θi-π⁢⁢fi⁢Δ⁢⁢t⁢⁢sin⁡(2⁢π⁢⁢FM⁢tFs)), respectively, where A represents an amplitude, where fi represents carrier frequencies, where FM represents a modulation frequency, where Fs represents a sampling rate, where Δt represents a predetermined maximum interaural time difference, where θi represents arbitrarily chosen phases, and where t represents a discrete time index. 10. The method of claim 1, further comprising estimating the auditory source width by a lateral extent of the binaural activity in single frequency-bands weighted over all auditory frequency bands by applying a weighting curve. 11. The method of claim 1, where the first noise signal is output from a first loudspeaker of a first pair of loudspeakers and a first loudspeaker of a second pair of loudspeakers, where the second noise signal is output from a second loudspeaker of the first pair of loudspeakers and a second loudspeaker of the second pair of loudspeakers, further comprising: determining a first averaged auditory source width for the first pair of loudspeakers;determining a second averaged auditory source width for the second pair of loudspeakers; andweighting the first and second averaged auditory source widths based on the position of the pairs of loudspeakers in a room of a loudspeakers-room system to obtain a single weighted overall auditory source width. 12. The method of claim 1, further comprising setting a determined value of the binaural activity that lies below a predetermined value to zero. 13. The method of claim 1, further comprising adjusting a sound system based on the auditory source width of the detected noise signals. 14. A method for estimating an auditory source width in a loudspeakers-room system, comprising: generating a first frequency modulated noise signal and a second frequency modulated noise signal;transmitting the first noise signal from a first loudspeaker;transmitting the second noise signal from a second loudspeaker;detecting binaurally the first noise signal and the second noise signal to obtain detected signals;filtering the detected signals in a way that corresponds to physiologic filtering of a human outer ear to obtain first filtered signals;filtering the first filtered signals in a way that corresponds to physiologic filtering of a human middle ear to obtain second filtered signals;filtering the second filtered signals by a non-uniform auditory bandpass filter bank to obtain sub-band signals for a predetermined number of sub-bands;half-wave rectifying and low-pass filtering the sub-band signals to obtain half-wave rectified sub-band signals;determining interaural time differences and interaural level differences of the half-wave rectified sub-band signals;combining the interaural time differences and the interaural level differences to obtain a binaural activity over time and a lateral width for each of the predetermined number of sub-bands;determining an average value of the lateral width of the binaural activity over time and the predetermined number of sub-bands; anddetermining the auditory source width of the noise signals based on cutting the binaural activity at one or more edges by applying a cutting function with an adaptive threshold, and where the act of determining the auditory source width comprises determining the auditory source width of the noise signals based on the edge-cut binaural activity. 15. A system, comprising: a binaural recording device configured to detect a first frequency modulated noise signal and a second frequency modulated noise signal;a non-uniform auditory bandpass filter bank configured to filter the noise signals to obtain sub-band signals for a predetermined number of sub-bands;means for determining a binaural activity over time and a lateral width for each of the predetermined number of sub-bands;means for determining an average value of the lateral width of the binaural activity over time and the predetermined number of sub-bands; andmeans for determining an auditory source width of the noise signals based on cutting the binaural activity at one or more edges by applying a cutting function with an adaptive threshold, and where the act of determining the auditory source width comprises determining the auditory source width of the noise signals based on the edge-cut binaural activity. 16. The system of claim 15, where the binaural recording device comprises a dummy head with a pair of ear-shaped molds each configured to accommodate a sound detection device. 17. The system of claim 15, further comprising means for determining interaural time differences and interaural level differences of the sub-band signals; and where the means for determining the binaural activity over time and the lateral width comprises means for combining the interaural time differences and the interaural level differences to obtain the binaural activity over time and the lateral width for each of the predetermined number, of sub-bands.