TH32292B - Resonator for non-linear circuits - Google Patents

Abstract

DC60 (04/02/41) Systems and methods for reducing echo which uses two or more microphones to create a beam of echo directly into the incoming speech signal. is the output of the speaker The microphone output is properly filtered. and then combined linearly to eliminate reflections where, although the incoming speech signal will be distorted non-linearly as well as the microphone may be positioned accordingly. Select or point to have a linear elimination of ambient noise. Systems and methods for reducing echo which uses two or more microphones to create a beam of echo directly into the incoming speech signal. is the output of the speaker The microphone output is properly filtered. and then combined linearly to eliminate reflections where, although the incoming speech signal will be distorted non-linearly. Also, the microphone may be positioned accordingly. Select or point to have a linear elimination of ambient noise.

Claims (1)

1. a sound circuit that consists of Microphone and speaker. The microphone will intercept speech signals from the speaker at the near end. and the speaker will receive Speech signal from the far end and determine the corresponding reflected signal that can intercepted by the said microphone. By the method of eliminating the echo, it consists of an episode of: - Arrangement of another microphone. at least in the audio circuit to trap such reflected signals. and another microphone At the very least, it is used to intercept speech signals from such near-ends - evaluating a number of sound transfer functions in a number of modulation filters, each with a number of coefficients. and one adjustment filter at least as such The speech signal from the far end is used as a comparison signal. to adjust its coefficient; - Filtering the output of the said microphone. one or more filters using one or more such adjustment filter coefficients; and - a combination of filtered and/or unfiltered microphone outputs in order to Remove the echo while retaining the speech signal of the near end. of a microphone At least in a fixed filter where its coefficients are stripped from one or more such modifier filters. One microphone output filtering It is at least in the scaling filter whose coefficient is adjusted using the speech signal from the far end. 4. A method as described in Claim 1, where the procedure of filtering consists of filtering the output of a microphone. at least in the filter adjust the other value as a calibration signal. There will be a first and second microphone. and the signal is reflected from the speaker to The first and second microphones There will be the transfer function of the sound H1 and H2 respectively and where the method consists of the steps of: - evaluating H1 in the first tuning filter. using speech signals such a distant end is a calibration signal to adjust the coefficient of the fine-tuning filter at one of these; - H2 rating in the second adjustment filter by using the speech signal of the end such a distant side as a calibration signal to adjust the coefficient of the second adjustment filter, such; - Filtering the output of one of the aforementioned microphones in one fixed filter by using the coefficient of the second adjustment filter as mentioned; - Filtering the output of the aforementioned second microphone. in the second constant filter by using the coefficient of the filter adjusted to one such value; - removal of the output of the aforementioned second fixed filter out of the filter output. 6. The method as stated in Claim Article 5, which further consists of the procedure. of the aforementioned first and second microphone positioning relative to the end user near the aforementioned and the aforementioned speakers in such a way that the microphones that one of them will pick up The higher the level of the speech signal at the near end thereof higher than the said second microphone and the first said microphone will receive a higher level of such reflected signal. higher than the said first microphone. of the aforementioned first and second microphone positioning that are equidistant from the speaker In order to reduce the ambient sound received equally by the first microphone and the second such 8. The method as specified in Claim 1, where the audio circuit It includes the first and second microphones. and the signal reflected from the speaker to the aforementioned first and second microphones. with the transfer function of the sound H1 and H2 respectively and where the method consists of the episodes of: - H1 evaluation in one tuning filter. by using the speech signal of the end such a distant side as a calibration signal to adjust the coefficient of the filter, adjust the value of one such; - filtering the output of the aforementioned second microphone in a constant filter, which evaluates H1/ H2 using the coefficients of the aforementioned first and second tuning filters; and - to remove the output of the aforementioned fixed filter from the microphone output. 9. The method as specified in Claim Article 8, which is hereby attached to the part of Positioning the first and second microphones thereof Relates to the user at the near end thereof and the speaker therein in such a way that the microphone at one of such will pick up the level. At the height of such a near-end speech signal, the higher the aforementioned second microphone. and the second microphone The echo signal is received at a higher level than the microphone. 1 0. Methods as stated in Claim Article 8, which are hereby attached to the section of Positioning the first and second microphones thereof are equally distant from the speaker in order to reduce the ambient sound received evenly by the first microphone and The second aforesaid 1 1. The method as specified in Claim 1 that the aforementioned audio circuit will include to the first and second microphones and the signal is reflected from the speaker to the microphone. the first and the second There will be a transfer function of the sounds H1 and H2 respectively and where the method consists of sections of: - 1/H1 evaluation in the first tuning filter. by using a speech signal from the end such a distant side as a calibration signal to adjust the coefficient of the filter, adjust the value of one such; - 1/H2 rating in the second adjustment filter by using a speech signal from the end such a distant side as a calibration signal to adjust the coefficient of the second adjustment filter, such; - filtering the output of one such microphone in one such tuning filter; - filtering the output of the aforementioned second microphone in the said second tuning filter; and - to remove the output of the aforementioned second filter from the output of The first such adjustment filter 1 2. Method as specified in Claim Article 11, which is hereinafter referred to as of the aforementioned first and second microphone positioning relative to the speaker at the end such near end and such speakers in such a way that the first microphone receives speech from that near end higher than that second microphone and that second microphone receives such echo at a higher level. microphone 1 aforesaid 1. 3. Methods as stated in Claim Article 11, which is hereby attached to the section of Position the aforementioned first and second microphones equally distant from the speaker in order to remove ambient noise that is picked up equally by the first and second microphones. The second aforesaid 1 4. The method as specified in Claim 1, where the aforementioned audio circuit will have first and second microphone The signal is reflected from the speaker to the microphone. the first and the second There will be a transfer function of the sounds H1 and H2 respectively, and where the method consists of the parts of : - H1 evaluation in the first tuning filter that uses the said distant speech signal as a calibration signal. adjust the filter coefficient, adjust one such value; - 1/H2 estimation in the second fine-tuning filter using the end's speech signal. such a distant side as a calibration signal to adjust the coefficient of the second adjustment filter, such; - Filtering the output of the aforementioned second microphone. in the second adjustment filter as mentioned; - filtering the output of the aforementioned second modifier filter in a fixed filter using the coefficient of the said first modifier filter; and - removing the output of the aforementioned fixed filter. out of the microphone output. 1 aforesaid 1. 5. Methods as stated in Claim Article 14, which are hereby attached to the section of The aforementioned first and second microphone positioning is relative to the speaker at the near end. such and such speakers in such a way that the microphones at one such will receive a speech signal of the near end at a higher level than the said second microphone and the said second microphone The speech signal will be received at a higher level than the said first microphone. Positioning the first and second microphones thereof are equally distanced from such loudspeakers in order to reduce the ambient sound received equally by the first and second microphones. There will be first and second microphone and the signal is reflected from the speaker to the first speaker and the second such There will be a transfer function of the sounds H1 and H2 respectively, and where the method consists of the episodes of; - H1 rating in one adjustment filter by using the speech signal of the end such a distant side as a calibration signal to adjust the coefficient of the filter, adjust the value of one such; - Assessment of H1/ H2 in the second adjustment filter using the filter output. adjust one such value as a calibration signal to adjust the coefficient of the adjustment filter. the second such; - Filtering the output of the aforementioned second microphone. in the second adjustment filter as mentioned; and - removing the output of the aforementioned fixed filter. out of the output of 1 aforementioned microphone 1. 8. Methods as set out in Claim 17, which is hereby attached to the part of The first and second microphones are positioned in relation to such users and such speakers in such a way that the first and second microphones will receive a speech signal from the end near the aforementioned at a higher level than the aforementioned second microphone and the second microphone The echo signal will be received at a level higher than the said first microphone. The positioning of the first and second microphones is equally distant from the speaker to remove the received surround sound equally by the first microphone. and the second thereof. 2 0. The method as specified in Claim 1, where the audio circuit It includes the first, second, and third microphones and the echo from said speaker. to the aforementioned first, second, and third microphones. There is a transfer function of the sounds H1, H2 and H5 respectively, and where the method consists of the sections of : - evaluating H1 in one tuning filter. by using a speech signal from the end such a distant side as a calibration signal to adjust the coefficient of the filter, adjust the value of one such; - H2 rating in the second adjustment filter by using a speech signal from the end such a distant side as a calibration signal to adjust the coefficient of the second adjustment filter, such; - H5 rating in the third adjustment filter by using a speech signal from the end such a distant side as a calibration signal to adjust the coefficient of the third adjustment filter, such; - Filtering the output of one of the aforementioned microphones In the first pair of filters fixed using the second and third adjustment filter coefficients as mentioned, respectively; - Filtering the output of the aforementioned second microphone. In the second pair of fixed filters by using the coefficients of the aforementioned first and third adjusted filters, respectively; - Filtering the output of the aforementioned third microphone. In the third pair of fixed filters using the coefficients of the aforementioned first and second adjusted filters, respectively; - multiplying the output of the aforementioned fixed pair of filters by the constant (c) in the first multiplier, where o 1. The method stipulated in Claim 20, where the value of (c) is adjusted for Such first and second - Subtraction of the output of such third pair of fixed filters from the output of the multiplier. in the second multiplier; and - multiplying the output of the aforementioned second pair of filters fixed by constant (1-c)>