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1. 发明授权

KR810000730B1 ELECTROMECHANICAL TRANSDUCERS USING A POLYMER PIEZO-ELECTRIC FILM 失效
公开(公告)号：KR810000730B1
公开(公告)日：1981-06-25
申请号：KR770000507
申请日：1977-03-02
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： NAONO HIROYUKI , ATOJI NOBUHISA , YAMANOTO HIROSHI , IBARAKI SATORU
IPC分类号： H04R17/02
摘要： The electromechaniclal transducers comprise a pair of first and second high-polymer piezoelectric film(5) each having electrically conductive, oppositely polarized surfaces and a single axis of elongation parallel to the surfaces, a cylindrically curved frame(4), a plate(10) having the same curvature to the frame, and a hole(11) formed on the plate. This transducers have the good features of high sensitivity, uniformity of frequency characteristics, and reduction of noise caused by mechanical vibration.

2. 发明专利

DE69404369D1 未知
公开(公告)号：DE69404369D1
公开(公告)日：1997-08-28
申请号：DE69404369
申请日：1994-04-13
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KANAMORI TAKEO , TAGAWA JUNICHI , IBARAKI SATORU , FURUKAWA HIROKI , ONO KIMINORI
IPC分类号： H04R3/00 , H04S1/00
摘要： A stereo ultradirectional microphone apparatus for detecting a sound to produce stereo sound signals, comprises: first and second ultradirectional microphones arranged side by side with a given distance in parallel for converting a sound into first and second sound signals respectively, first and second delays for delaying an output of the first and second microphones by a delay time tau respectively, and first and second subtractors for subtracting for subtraction between the first sound signal and an output of the second delay and subtracting for subtraction between the second sound signal and an output of the first delay. The delay time tau corresponds to a difference between the timings of a sound from a sound source in a direction making a clockwise angel theta from the front where a dead angel should be made. The subtraction provides the dead angle. Similarly, a dead angle on the side is also made to obtain a stereo characteristic. The directivity in the frequency characteristic of microphone is equalized to cancel the sensitivity in the dead angle. A stereo apparatus for forming the dead angles with two set of two filters having respective transfer characteristics determined by measurement and an adder is also disclosed.

3. 发明专利

DE2714709A1 未知
公开(公告)号：DE2714709A1
公开(公告)日：1977-10-06
申请号：DE2714709
申请日：1977-04-01
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： ATOJI NOBUHISA , NAONO HIROYUKI , IBARAKI SATORU , YAMAMOTO HIROSHI , MATSUMOTO MICHIO , SUZUMARA MASAKI
IPC分类号： H04R7/16 , H04R17/00 , H04R31/00

4. 发明专利

DE69429947T2 未知
公开(公告)号：DE69429947T2
公开(公告)日：2002-11-28
申请号：DE69429947
申请日：1994-05-27
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： FURUKAWA HIROKI , TAGAWA JUNICHI , KANAMORI TAKEO , IBARAKI SATORU
IPC分类号： H04B3/23 , H04M9/08 , H04M3/56
摘要： In an echo canceller, a first adaptive filter (1) estimates an impulse response of an echo path between reception and transmission side by an NLMS algorithm to synthesize a pseudo echo, while a second adaptive filter (3) determines whether there is an echo path change or a double talk. A voice detector (8) detects a short time power of the received input signal (x) to determine whether far-end speech is present or absent, wherein said voice detector controls said second adaptive filter (3) to execute adaptation of said second adaptive filter for renewal of an impulse response of an echo path when far-end speech is present and otherwise to suspend the adaptation of said second adaptive filter when far-end speech is absent, while a double talk detector (9) controls the first adaptive filter to execute or suspend adaptation of the first adaptive filter according to the determination results of the voice detector.

5. 发明专利

DE69404369T2 未知
公开(公告)号：DE69404369T2
公开(公告)日：1997-11-13
申请号：DE69404369
申请日：1994-04-13
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KANAMORI TAKEO , TAGAWA JUNICHI , IBARAKI SATORU , FURUKAWA HIROKI , ONO KIMINORI
IPC分类号： H04R3/00 , H04S1/00
摘要： A stereo ultradirectional microphone apparatus for detecting a sound to produce stereo sound signals, comprises: first and second ultradirectional microphones arranged side by side with a given distance in parallel for converting a sound into first and second sound signals respectively, first and second delays for delaying an output of the first and second microphones by a delay time tau respectively, and first and second subtractors for subtracting for subtraction between the first sound signal and an output of the second delay and subtracting for subtraction between the second sound signal and an output of the first delay. The delay time tau corresponds to a difference between the timings of a sound from a sound source in a direction making a clockwise angel theta from the front where a dead angel should be made. The subtraction provides the dead angle. Similarly, a dead angle on the side is also made to obtain a stereo characteristic. The directivity in the frequency characteristic of microphone is equalized to cancel the sensitivity in the dead angle. A stereo apparatus for forming the dead angles with two set of two filters having respective transfer characteristics determined by measurement and an adder is also disclosed.

6. 发明专利

DE69429947D1 未知
公开(公告)号：DE69429947D1
公开(公告)日：2002-04-04
申请号：DE69429947
申请日：1994-05-27
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： FURUKAWA HIROKI , TAGAWA JUNICHI , KANAMORI TAKEO , IBARAKI SATORU
IPC分类号： H04B3/23 , H04M9/08 , H04M3/56
摘要： In an echo canceller, a first adaptive filter (1) estimates an impulse response of an echo path between reception and transmission side by an NLMS algorithm to synthesize a pseudo echo, while a second adaptive filter (3) determines whether there is an echo path change or a double talk. A voice detector (8) detects a short time power of the received input signal (x) to determine whether far-end speech is present or absent, wherein said voice detector controls said second adaptive filter (3) to execute adaptation of said second adaptive filter for renewal of an impulse response of an echo path when far-end speech is present and otherwise to suspend the adaptation of said second adaptive filter when far-end speech is absent, while a double talk detector (9) controls the first adaptive filter to execute or suspend adaptation of the first adaptive filter according to the determination results of the voice detector.

7. 发明专利

CA1103796A MICROPHONE CAPABLE OF CANCELLING MECHANICAL GENERATED NOISE 未知
公开(公告)号：CA1103796A
公开(公告)日：1981-06-23
申请号：CA275684
申请日：1977-04-06
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： ATOJI NOBUHISA , NAONO HIROYUKI , YAMAMOTO HIROSHI , IBARAKI SATORU
IPC分类号： H04R17/02 , H04R7/16 , H04R17/00 , H04R31/00
摘要： A microphone comprises a pair of electroacoustic transducing membranes mounted in a housing opposition to each other. The membranes are electrically series connected to each other to generate an output which is substantially twice the voltage developed individually from each membrane when said membranes are caused to flex in opposite directions and substantially zero when said membranes are caused to flex in the same direction.

8. 发明专利

JP2002232988A MULTI-CHANNEL SOUND COLLECTION SYSTEM 失效
公开(公告)号：JP2002232988A
公开(公告)日：2002-08-16
申请号：JP2001021142
申请日：2001-01-30
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： KANAMORI TAKEO , TERAI KENICHI , IBARAKI SATORU
IPC分类号： H04R5/027 , H04R3/00
摘要： PROBLEM TO BE SOLVED: To provide a multi-channel sound collection system adopting the 3-2 system for 5 channel stereophonic signals with a small size and less vibration and wind noise, at a low cost that is mounted on a video camera. SOLUTION: The multi-channel sound collection system is provided with a 1st omnidirectional microphone 1, a 2nd omnidirectional microphone 2, a 3rd omnidirectional microphone 3, a 1st synthesis means 4 that synthesizes omnidirectional microphones directed to a front left side, a 2nd synthesis means 5 that synthesizes omnidirectional microphones directed to a front right side, a 3rd synthesis means 6 that synthesizes omnidirectional microphones directed to a rear right side, a 4th synthesis means 7 that synthesizes omnidirectional microphones directed to a rear left side, and a 5th synthesis means 8 that synthesizes omnidirectional microphones directed in front. Thus, only the 3 omnidirectional microphones can realize the multi-channel sound collection system adopting the 3-2 system for 5 channel stereophonic signals.

9. 发明专利

JP2001156568A SOUND QUALITY ADJUSTMENT DEVICE 失效
公开(公告)号：JP2001156568A
公开(公告)日：2001-06-08
申请号：JP34174899
申请日：1999-12-01
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： TAGAMI AKIRA , MISAKI MASAYUKI , TAGAWA JUNICHI , IBARAKI SATORU
IPC分类号： H04R3/00 , G10K15/00 , G10K15/04 , H03G3/32 , H03G5/16
摘要： PROBLEM TO BE SOLVED: To provide a sound quality adjustment device that can realize the comparable load of the sound volume and the quality even in the presence of ambient noise as those in the absence of ambient noise. SOLUTION: A sine wave and noise reproduced from a sine wave generating means 6 and a band noise generating means 7 are heard as trial and a signal level adjustment means 10 measures a minimum audible level of the sine wave when noise is in existence. A relational expression between a sound pressure level and loudness of an object signal in the presence of the noise is set to a loudness characteristic setting means 11 based on a measured minimum audible level. Then, a noise level detection means detects a level of an environmental noise picked up by a microphone 2 and a loudness correction means 5 applies signal processing to a received audio signal so as to provide the same loudness as that in the absence of noise depending on the level.

10. 发明专利

JPH10341123A ACOUSTIC REPRODUCTION DEVICE 失效
公开(公告)号：JPH10341123A
公开(公告)日：1998-12-22
申请号：JP14962797
申请日：1997-06-06
申请人： MATSUSHITA ELECTRIC IND CO LTD
发明人： TANAKA SHUNSUKE , MISAKI MASAYUKI , TAGAMI AKIRA , IBARAKI SATORU
IPC分类号： G10K15/00 , H03G5/16
摘要： PROBLEM TO BE SOLVED: To allow a device to reproduce a sound preferred by a listener even when surrounding noise is subject to change by compensating a listening fault caused by masking of surrounding noise at reproduction of an acoustic signal. SOLUTION: A sound signal is given to a sound processing means 18 and an input output characteristic calculation means 13. An environment sound picked up by a microphone 11 is given to an environment sound measurement means 12, where a masking band is analyzed by using a band split filter. In the case of reproducing the sound signal by a listener, a specific loudness characteristic is extracted from an audible sense database 14, and a preference tone adjustment means 15 adjusts the loudness characteristic. The input output characteristic calculation means 13 calculates an input output characteristic of each frequency band to be processed to control an output characteristic of a reproduced sound.

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