EP1649719A1 - Device and method for operating voice-assisted systems in motor vehicles - Google Patents
Device and method for operating voice-assisted systems in motor vehiclesInfo
- Publication number
- EP1649719A1 EP1649719A1 EP04740501A EP04740501A EP1649719A1 EP 1649719 A1 EP1649719 A1 EP 1649719A1 EP 04740501 A EP04740501 A EP 04740501A EP 04740501 A EP04740501 A EP 04740501A EP 1649719 A1 EP1649719 A1 EP 1649719A1
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- European Patent Office
- Prior art keywords
- signal
- microphone
- power
- generated
- frequency
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000004891 communication Methods 0.000 claims abstract description 10
- 230000001419 dependent effect Effects 0.000 claims abstract description 6
- 230000000903 blocking effect Effects 0.000 claims description 24
- 101100495769 Caenorhabditis elegans che-1 gene Proteins 0.000 claims 1
- 230000006870 function Effects 0.000 description 11
- 238000012937 correction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 2
- 230000001755 vocal effect Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000013528 artificial neural network Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
- H04R3/02—Circuits for transducers, loudspeakers or microphones for preventing acoustic reaction, i.e. acoustic oscillatory feedback
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/13—Acoustic transducers and sound field adaptation in vehicles
Definitions
- the invention relates to a method and a device for operating voice-assisted systems, such as communication and / or speech / intercom devices in motor vehicles, in which speech signals are recorded via a microphone arrangement and transmitted to at least one loudspeaker.
- Methods of this type are used in motor vehicles for voice-assisted intercom operation or to support voice-input-controlled electronic or electrical assemblies.
- the basic problem here is that a corresponding background noise is present in the motor vehicle, depending on the operating state. This covers the voice commands.
- Intercom and intercom systems in motor vehicles are predominantly advantageous in large vehicles, minibuses and the like. However, they can also be used in normal passenger cars.
- voice-controlled input units for electrical components in the vehicle suppressing the background noise or filtering out the voice command is of particular importance.
- EP 0078014 B1 discloses a speech recognition device for a motor vehicle in which the amplifier system of the speech recognition device reports or feeds via sensors whether the engine is in operation and / or the vehicle is moving. Then there is a level control with which an attempt is made to filter the voice command out of the background noise.
- a filtering is known from WO 97/34290 in which periodic interference signals are filtered out by determining their period and interfering by means of a generator, so that the speech signal remains.
- DE 39 25 589 A1 discloses the use of a multiple microphone arrangement, one of the microphones being arranged in the engine compartment and another in the passenger compartment when used in a motor vehicle. The two signals are then subtracted.
- the disadvantage here is that only the engine noise or the actual operating noise of the vehicle itself is subtracted from the overall signal in the passenger compartment. Specific background noises are not taken into account here.
- the invention is therefore based on the object of developing a method and a device of the generic type in such a way that the verbal communication of the occupants of a vehicle is improved.
- This object is achieved in that for operating a voice-assisted system, such as a communication and / or speech / intercom device in a motor vehicle, with at least one microphone and at least one loudspeaker for reproducing a signal generated by the microphone and with one between the microphone and the loudspeaker arranged bandpass filter determines a frequency-dependent power of the signal and the bandpass filter is set as a function of at least one local maximum of the power of the signal over the frequency.
- a voice-assisted system such as a communication and / or speech / intercom device in a motor vehicle
- a local maximum of the power of the signal over the frequency can of course also include the global maximum of the power of the signal over the frequency.
- the local maximum of the power of the signal is determined as a function of a derivative, in particular the first derivative, of the power of the signal according to the frequency.
- an edge signal is formed by means of the first derivative of the power of the signal according to the frequency, which edge assumes a first binary value if the first derivative of the power of the signal according to the frequency is greater than or equal to zero and which assumes a second binary value , if the first derivative of the power of the signal is less than zero according to the frequency, the local maximum of the power of the signal being determined as a function of the first derivative of the edge signal.
- the presence of a local maximum of the power of the signal is only assumed if the first derivative of the edge signal is less than zero.
- the above-mentioned object is also achieved in that for operating a voice-assisted system, such as a communication and / or speaking / intercom device in a motor vehicle, with at least one microphone and at least one loudspeaker for reproducing a signal generated by the microphone and with one between the microphone and the loudspeaker arranged bandpass filter determines a frequency-dependent power of the signal and the bandpass filter is set as a function of a derivative of the power of the signal according to the frequency.
- a voice-assisted system such as a communication and / or speaking / intercom device in a motor vehicle
- the bandpass filter is set as a function of at least two local maxima of the power of the signal over the frequency.
- the bandpass filter is set as a function of the first derivative of the power of the signal according to the frequency.
- an edge signal is formed by the first derivation of the power of the signal according to the frequency takes the first binary value if the first derivative of the power of the signal after the frequency is greater than or equal to zero, and that takes a second binary value if the first derivative of the power of the signal after the frequency is less than zero, the bandpass filter depending of the edge signal or the first derivative of the edge signal is set.
- all local maxima are determined in a frequency range.
- the global maximum is determined in the frequency range.
- the bandpass filter is set such that it blocks the portion of the signal generated by the microphone at a blocking frequency only when the ratio - at least the power of the signal generated by the microphone at the frequency at which the power of the signal generated by the microphone is at a maximum - the mean value of the power of the signal generated by the microphone at other frequencies of the signal generated by the microphone is greater than a feedback power limit (RatioThreshold, OutGrdRatio- Threshold).
- the bandpass filter is set such that it blocks the portion of the signal generated by the microphone at a blocking frequency only when the ratio - at least the power of the signal generated by the microphone at the frequency at which the power of the signal generated by the microphone is at a maximum - the mean value of the power of the signal generated by the microphone at other frequencies of the signal generated by the microphone is longer than a time-ratio limit (BinRatioTimeThreshold) greater than a feedback power limit (RatioThreshold, OutGrd RatioThreshold).
- the bandpass filter is set such that it blocks the portion of the signal generated by the microphone at a blocking frequency only if the ratio - the power of the signal generated by the microphone at the frequency at which the Power of the signal generated by the microphone is maximum, plus / or the power of the signal generated by the microphone at one of the more frequencies of the signal generated by the microphone that is the frequency at which the power of the signal generated by the microphone is maximum, are adjacent to - the mean value of the power of the signal generated by means of the microphone at other frequencies of the signal generated by means of the microphone is greater than a feedback power limit (RatioThreshold, OutGrdRatio- Threshold).
- the bandpass filter is set such that it blocks the portion of the signal generated by the microphone at a blocking frequency only if the ratio - the power of the signal generated by the microphone at the frequency at which the Power of the signal generated by the microphone is maximum, plus / or the power of the signal generated by the microphone at one of the more frequencies of the signal generated by the microphone that is the frequency at which the power of the signal generated by the microphone is maximum, are adjacent to - the mean value of the power of the signal generated by the microphone at other frequencies of the signal generated by the microphone is longer than a time-ratio limit (BinRatioTimeThreshold) greater than a feedback power limit (RatioThreshold, OutGrdRatioThreshold).
- the bandpass filter is set such that it blocks the portion of the signal generated by the microphone at a blocking frequency only if the ratio - the power of the signal generated by the microphone at the frequency at which the Power of the signal generated by the microphone is maximum, plus / or the power of the signal generated by the microphone at the frequency of the signal generated by the microphone, - which is immediately adjacent to the frequency at which the power of the signal generated by the microphone is maximum, and - at which the power is greater is greater than at a frequency which is also directly adjacent to the frequency at which the power of the signal generated by the microphone is at a maximum to the mean value of the power of the signal generated by the microphone at other frequencies of the signal generated by the microphone is a feedback performance limit (RatioThreshold, OutGrdRatio- Threshold).
- the bandpass filter is set such that it blocks the portion of the signal generated by the microphone at a blocking frequency only if the ratio - the power of the signal generated by the microphone at the frequency at which the Power of the signal generated by the microphone is maximum, plus / or the power of the signal generated by the microphone at the frequency of the signal generated by the microphone, - the frequency at which the power of the signal generated by the microphone is maximum, immediately is adjacent, and - at which the power is greater than at a frequency which is also directly adjacent to the frequency at which the power of the signal generated by the microphone is maximally adjacent - to the mean value of the power of the signal generated by the microphone at other frequencies of the signal generated by the microphone longer than a time V gain limit (BinRatioTimeThreshold) is greater than a feedback power limit (RatioThreshold, OutGrdRatioThreshold).
- the bandpass filter is set such that it blocks the portion of the signal generated by the microphone at a blocking frequency only if the ratio the power of the signal generated by the microphone at the frequency at which the power of the signal generated by the microphone is maximum, plus the power of the signal generated by the microphone at the frequency of the signal generated by the microphone, at which the power of the signal generated by the microphone is maximum, is immediately adjacent, and - at which the power is greater than at a frequency which is also directly adjacent to the frequency at which the power of the signal generated by the microphone is maximum is to - the average of the power of the signal generated by the microphone of all, at least significant, further (examined) frequencies of the signal generated by the microphone is greater than a feedback power limit (RatioThreshold, OutGrdRatio- Threshold).
- the bandpass filter is set such that it blocks the portion of the signal generated by the microphone at a blocking frequency only if the ratio - the power of the signal generated by the microphone at the frequency at which the Power of the signal generated by the microphone is maximum, plus the power of the signal generated by the microphone at the frequency of the signal generated by the microphone, - which is directly adjacent to the frequency at which the power of the signal generated by the microphone is maximum , and - at which the power is greater than at a frequency which is also directly adjacent to the frequency at which the power of the signal generated by the microphone is at a maximum, - the mean value of the power of the signal generated by the microphone of all, at least essential, further (examined) frequencies of the ore using the microphone signal is longer than a time-ratio limit (BinRatioTimeThreshold) is greater than a feedback power limit (RatioThreshold, OutGrdRatioThreshold).
- the feedback power is longer than a time-ratio limit (BinRatio
- the feedback power limit (RatioThreshold, OutGrdRatioThreshold) is between 20 and 50.
- the bandpass filter is set such that it blocks the portion of the signal generated by the microphone at a blocking frequency only if the ratio - the power of the signal generated by the microphone at the frequency at which the The power of the signal generated by the microphone is at a maximum - the mean value of the power of the signal generated by the microphone at other frequencies at which the power of the signal generated by the microphone has a local maximum is greater than an additional power limit (RichContentThreshold ).
- the bandpass filter is set such that it blocks the portion of the signal generated by the microphone at a blocking frequency only if the ratio - the power of the signal generated by the microphone at the frequency at which the The power of the signal generated by the microphone is at a maximum - the average of the power of the signal generated by the microphone at all other (examined) frequencies at which the power of the signal generated by the microphone has a local maximum is greater than an addition - Performance limit (RichContentThreshold).
- the maximum should alternatively or additionally also include the power that the signal has a closely adjacent frequency of the aforementioned frequency and (still) has a power similar to that of the respective maximum.
- the additional power limit (RichContentThreshold) is between 20 and 50, in a particularly advantageous embodiment of the invention between 30 and 40.
- the bandpass filter is set as a function of its output signal.
- the bandpass filter is a notch filter or a filter bank with at least one notch filter.
- the filter bank can e.g. Include 10 notch filters.
- FIG. 5 shows an exemplary embodiment of a flowchart implemented in a decision logic
- Fig. 8 is a power-frequency diagram
- Fig. 9 is a power-frequency diagram.
- Reference numerals 2 and 3 denote the front seats and reference numerals 4, 5 and 6 the rear seats of the motor vehicle.
- Reference numerals 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 and 20 denote loudspeakers.
- Reference numerals 21, 22, 23 and 24 denote microphones.
- the loudspeakers 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 and 20 partly belong to a music system and partly to a communication or speaking / intercom system. They can also be used by both systems.
- the loudspeakers 9, 17, 18, 19, 20 give a signal generated by the microphone 21, the loudspeakers 7, 17, 18, 19, 20 give a signal generated by the microphone 22, the loudspeakers 7, 9, 19, 20 a signal generated by the microphone 23 and the speakers 7, 9, 17, 18 a signal generated by the microphone 24.
- the communication is better, the stronger a signal between one of the microphones 21, 22, 23, 24 and one of the loudspeakers 7, 9, 17, 18, 19, 20 is amplified.
- a microphone 30, which can be one of the microphones 21, 22, 23, 24, and a loudspeaker 31, which is one of the loudspeakers 7, 9, 17, 18, 19, 20, is shown in FIG. 2 .
- a bandpass filter 32 is provided. This filters a signal S generated by the microphone 30 and delivers a filtered signal S ' in which certain frequency ranges are filtered out, for which a decision logic 33 has recognized the risk of feedback.
- the decision logic 33 determines filter parameters f c and Q by means of which the bandpass filter 32 is set.
- Amplifiers can be provided to amplify the signal S and / or the signal S '. However, the amplifier function can also be taken over by the bandpass filter.
- the bandpass filter 32 is advantageously designed as a filter bank, as shown in FIG. 4.
- the filter bank advantageously comprises up to 10 notch filters.
- a step 40 the frequency f of the Signal S analyzed and, as exemplified in Fig. 6, the power P of the signal S on, for example, 192 different test frequencies f n, f n + 1, f n + 2l f n + 3, f n + 4, f n +5 , f n + 6 ,. fn + s determined, for example, 40Hz apart.
- Step 40 is followed by a query 41 as to whether for an examination frequency f n , f n + 1 , f n + 2 , fn + 3. f ⁇ +4 > f n +5 > f n +8 there is a risk of feedback. Details of this query are given with respect to FIG. 7. Unless f n , fn + ⁇ , f n +2 for no examination frequency. f n +3, f n +4, fn + 5, f n + 8 there is a risk of feedback, query 41 is followed by step 40.
- query 41 is followed by query 42 as to whether signal S generated by microphone 30 has already been reduced by the bandpass filter by signal components around this examination frequency.
- the query 42 is followed by a query 43 as to whether a bandpass filter is available. If a bandpass filter is available, query 43 is followed by step 47, in which a bandpass filter is selected and the filter parameters, ie the center frequency f c and the quality Q of the bandpass filter, are generated.
- the center frequency f c is an example of the blocking frequency in the sense of the claims. The blocking frequency in the sense of However, the frequency range around the center frequency f c , which the bandpass filter actually filters out of the signal S generated by the microphone 30, can also be particularly demanding.
- the center frequency f c can, for example, be set equal to the examination frequency for which feedback has been determined. In an alternative embodiment of the invention, however, the center frequency f c can also be the examination frequency added with a correction frequency.
- This correction frequency is formed, for example, as a function of the power of the signal generated by means of the microphone at the examination frequency at which the power of the signal generated by means of the microphone is at a maximum, and the power of the signal generated by means of the microphone at at least one examination frequency lying next to this examination frequency.
- test frequencies fi, f 2 , .... f 192 are assumed, fi is 40Hz.
- fdist is 40Hz for all examination frequencies. The following also applies to the power of the signal generated by the microphone at the examination frequencies fi, f 2 , .... f ⁇ 92 :
- the examination frequency at which the power of the signal generated by the microphone is maximum is thus 3840 Hz and the blocking frequency is 3832 Hz.
- fkorr 40Hz * (2-4) / (16+
- ) -4.44Hz
- the maximum signal is 3840Hz and the blocking frequency is 3835.56Hz.
- the quality Q is set to a predetermined value of e.g. 1 / 40Hz set.
- query 43 is followed by a step 48 in which the power of signal S is reduced by a reduction factor which is advantageously between 2 dB and 5 dB, in particular essentially 3dB becomes.
- query 42 reveals that signal S generated by microphone 30 is already reduced by the bandpass filter by signal components around the examination frequency
- query 42 is followed by query 44.
- Query 44 queries whether further expansion is required of the frequency range in which the bandpass filter blocks, that is, by further reducing its quality Q, a predetermined minimum quality would be undershot.
- step 45 which corresponds to step 48, the power of the signal S is reduced by a reduction factor, which advantageously between 2dB and 5dB, in particular essentially 3dB, is reduced.
- step 46 the quality Q is reduced, i.e. the bandpass filter expanded.
- Steps 45, 46, 47 and 48 are followed by a step 49, in which a time between 0.1s and 3s is waited for.
- a query 61 is initially provided as to whether the power of the output signal S 'of the bandpass filter 32 exceeds an output limit value. If the power of the output signal S 'of the bandpass filter 32 exceeds the output limit value, query 61 is followed by query 62, for example whether the ratio PowerRatio3 the power MaxBinPwrPlusNeighbor of the signal S generated by means of the microphone 30 at the examination frequency at which the power of the signal S generated by means of the microphone 30 is at a maximum, plus the power of the signal S generated by means of the microphone 30 at the examination frequency of the means of the microphone 30 generated signal S, - which is directly adjacent to the examination frequency at which the power of the signal S generated by the microphone 30 is at a maximum, and - at which the power is greater than at an examination frequency, that of the examination frequency at which the power of the signal S generated by the microphone 30 is maximum, is also directly adjacent to the mean value MeanBinPwrRemainder of the power
- the query 62 it is advantageously queried - as provided in this exemplary embodiment - whether the ratio PowerRatio3 - the power MaxBinPwrPlusNeighbor of the signal S generated by the microphone 30 at the frequency at which the power of the signal S generated by the microphone 30 is maximum, plus the power of the signal S generated by the microphone 30 at the examination frequency of the signal S generated by the microphone 30, - which is directly adjacent to the examination frequency at which the power of the signal S generated by the microphone 30 is maximum, and - at which is greater than at an examination frequency which is also directly adjacent to the examination frequency at which the power of the signal S generated by the microphone 30 is at a maximum -
- the mean MeanBinPwrRemainder of the power of the signal S generated by means of the microphone 30 of all further examination frequencies of the signal S generated by means of the microphone 30 is longer than a time-ratio limit value OutBinRatioTimeThreshold
- the performance limit OutGrdRatioThreshold is between 30 and 40.
- query 62 is only answered positively if the global maximum is longer than a time limit OutGrdMaxBinTimeThreshold at an examination frequency.
- the local maxima are first determined.
- the first derivative of the power of the signal S according to the frequency f is first determined (for the examination frequencies).
- An edge signal is then formed from the first derivative of the power of the signal S according to the frequency f, which takes a first binary value if the first derivative of the power of the signal S according to the frequency f is greater than or equal to zero and which takes a second binary value, if the first derivative of the power of the signal S after the frequency f is less than zero.
- the first derivative of the edge signal is then determined.
- the presence of a local maximum of the power of the signal S over the frequency f is only assumed if the first derivative of the edge signal is less than a limit value.
- idx_vec FinfInfletions (x, flec_thresh)
- dtdx diff (x);
- dtdx dtdx> 0;
- dt2dx diff (dtdx);
- idx_vec find (dt2dx ⁇ flec_thres_ ⁇ );
- idx_vec idx__vec + 1;
- Table 1 shows an embodiment of a program programmed in the Matlab TM language, which the indices idx_vec of the examination frequencies determined, where there are local maxima according to the aforementioned criteria.
- X denotes a vector with the performance at the individual examination frequencies and flecjhresh a value between 0 and -1.
- the local maximum with the greatest performance is considered the global maximum.
- query 62 is answered in the affirmative, query 62 is followed by query 63, otherwise step 64.
- Query 63 queries whether signal S has a strong harmonic component. To this end, an exemplary advantageous embodiment asks whether the ratio - the power of the signal S generated by the microphone 30 at the examination frequency at which the power of the signal S generated by the microphone 30 is at a maximum - to the average value of the power of the signal Microphones 30 generated signal S at all other examination frequencies at which the power of signal S generated by microphone 30 has a local maximum is less than or equal to an additional power limit value RichContentThreshold.
- Query 63 shows that the ratio - the power of the signal S generated by the microphone 30 at the examination frequency at which the power of the signal S generated by the microphone 30 is at a maximum - to the mean value of the power of the signal S generated by the microphone 30 If signal S is at all other examination frequencies, at which the power of signal S generated by microphone 30 has a local maximum, is less than or equal to an additional power limit value RichContentThreshold, query 63 is followed by step 64. Otherwise, feedback is assumed.
- step 64 the process is stopped for a predetermined holding time, for example 3 seconds. After the holding time has elapsed, feedback is denied. If query 61 shows that the power of the output signal S 'of the bandpass filter 32 does not exceed the output limit value, query 61 is followed by a query 65 which essentially corresponds to query 62. However, a different feedback power limit value RatioThreshold and not OutGrdRatioThreshold is used , However, the feedback power limit RatioThreshold is also advantageously between 30 and 40.
- query 65 is followed by query 66 corresponding to query 63. Otherwise, the presence of feedback is denied.
- Query 66 reveals that the ratio - the power of the signal S generated by means of the microphone 30 at the examination frequency at which the power of the signal S generated by means of the microphone 30 is at a maximum - to the mean value of the power of the signal generated by means of the microphone 30 Signal S at all other examination frequencies, at which the power of the signal S generated by the microphone 30 has a local maximum, is less than or equal to an additional power limit value RichContentThreshold, then the presence of a feedback is denied. Otherwise feedback is assumed.
- the feedback detection according to the invention is not limited to the embodiment described above.
- the feedback detection can e.g. are designed such that only query 65 is provided.
- the feedback detection can also be designed in such a way that the embodiment according to FIG. 7 with its binary decision logic is replaced by an unsharp decision logic, that is to say fuzzy logic or neural networks.
- the query 63 according to FIG. 7 is explained below using two signals 80 and 90 shown in FIGS. 8 and 9 in a power-frequency diagram.
- the power P of the signals 80 and 90 is plotted in dB above the index idx_vec of the examination frequencies.
- the query 61 for both signals 80 and 90 shows that the power of the output signal S 'of the bandpass filter 32 exceeds the output limit value and that therefore the Query 61 follows query 62. It is also assumed that query 62 is answered in the affirmative.
- the + signs in FIG. 8 and FIG. 9 designate all examination frequencies which have been recognized as local / global maxima by means of the program according to Table 1.
- reference numeral 81 denotes the global maximum of the signal 80.
- reference numeral 91 denotes the global maximum of the signal 90.
- the examination frequencies are 40 Hz apart.
- the additional performance limit RichContentThreshold is 37.
- the ratio - the power of the signal 80 at the examination frequency, at which the power of the signal 80 is maximum, to - the mean value of the power of the signal 80 at all other examination frequencies, at which the power of the signal 80 has a local maximum, is in about 16 and is thus significantly smaller than 37.
- the query 63 would thus be answered in the affirmative and thus the presence of feedback would be denied.
- the ratio - the power of the signal 90 at the examination frequency, at which the power of the signal 90 is maximum, to - the mean value of the power of the signal 90 at all other examination frequencies, at which the power of the signal 90 has a local maximum, is in about 73 and is therefore significantly larger than 37.
- the query 63 would therefore be answered in the negative and therefore feedback.
- BinRatioTimeThreshold Time-ratio limit f Frequency fn> fn + 1> fn + 2> fn + 3 ⁇ fn + 4j fn + 5.
- fn + 6 ⁇ fn + 7> fn + 8 ⁇ U, f ⁇ 7, f 98, fi22, i92 frequency points f c center frequency fdist is the distance between the examination frequency at which the power of the signal generated by the microphone is at a maximum and an examination frequency having the greatest power immediately next to the examination frequency at which the power of the by means of the Microphone generated signal is fkorr correction frequency MaxBinPwrPlusNeighbor Power of the signal generated by the microphone at the frequency at which the power of the signal generated by the microphone is maximum, plus the power of the signal generated by the microphone at the frequency of the signal generated by the microphone, that of the frequency at the power of the signal generated by the microphone is maximum, is immediately adjacent, and at which the power is greater than at a frequency that is also
- Pneighleft Power of the signal generated by the microphone at the examination frequency immediately below the examination frequency at which the power of the signal generated by the microphone is maximum Pneighright Power of the signal generated by the microphone at the examination frequency immediately above the examination frequency at which the power of the signal generated by the microphone is maximum
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- General Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
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Abstract
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US10/623,286 US7912228B2 (en) | 2003-07-18 | 2003-07-18 | Device and method for operating voice-supported systems in motor vehicles |
PCT/EP2004/007129 WO2005018277A1 (en) | 2003-07-18 | 2004-06-30 | Device and method for operating voice-assisted systems in motor vehicles |
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EP1649719B1 EP1649719B1 (en) | 2013-05-15 |
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EP (1) | EP1649719B1 (en) |
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CN107585110A (en) * | 2016-10-21 | 2018-01-16 | 南宁可美汽车用品有限公司 | It is a kind of to be controlled using former car side to control the method and system that vehicle radio station switchs |
US11921238B2 (en) * | 2018-05-18 | 2024-03-05 | The Charles Stark Draper Laboratory, Inc. | Convolved augmented range LIDAR nominal area |
CN109413728B (en) * | 2018-12-29 | 2022-01-04 | 维沃移动通信有限公司 | Terminal equipment and signal processing method |
US10418019B1 (en) * | 2019-03-22 | 2019-09-17 | GM Global Technology Operations LLC | Method and system to mask occupant sounds in a ride sharing environment |
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- 2004-06-30 JP JP2006519796A patent/JP4723491B2/en not_active Expired - Lifetime
- 2004-06-30 CN CN2004800207410A patent/CN1826835B/en not_active Expired - Lifetime
- 2004-06-30 EP EP04740501.4A patent/EP1649719B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
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See references of WO2005018277A1 * |
Also Published As
Publication number | Publication date |
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US20050013451A1 (en) | 2005-01-20 |
JP4723491B2 (en) | 2011-07-13 |
US7912228B2 (en) | 2011-03-22 |
CN1826835B (en) | 2012-05-30 |
JP2007527145A (en) | 2007-09-20 |
EP1649719B1 (en) | 2013-05-15 |
CN1826835A (en) | 2006-08-30 |
WO2005018277A1 (en) | 2005-02-24 |
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