| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 61 | JPS5915563B2 - | JP16165079 | 1979-12-14 | JPS5915563B2 | 1984-04-10 | MINAGAWA SHOICHI; SAKAI TAKAMASA; OKAMOTO TAKESHI |
| 62 | JPS5915562B2 - | JP16033679 | 1979-12-12 | JPS5915562B2 | 1984-04-10 | MINAGAWA SHOICHI; OKAMOTO TAKESHI; SAKAI TAKAMASA |
| 63 | Receiver | JP9064981 | 1981-06-11 | JPS57204643A | 1982-12-15 | MORI SEIJI |
| PURPOSE: To obtain an FM signal receiver with high sensitivity and high fidelity, by eliminating the receiving fault such as a mutual modulating fault, etc. which is caused by a high frequency amplifier or a frequency converter. CONSTITUTION: The signal fed through an antenna 41 is applied to a transducer (a) of a surface acoustic wave amplifier 45-1 through a pre-band pass filter 42, a circulator 43 and a matching citcuit 44. The signal applied to the transducer (a) is converted into a sound wave and then converted again into an electric signal by a transducer (b). The differential freqeuncy between the pump frequency and the signal frequencies is trnasmitted to the transducer (a). The differential frequency passes through the circulator 43, a frequency converter 46, an IF filter 48 and an IF amplifier 49 and discharged through a speaker 53 via a phase comparator 50, an LPF51 and a low frequency amplifier 52 along with the signal passed through a frequency converter 46', an IF filter 48' and an IF amplifier 49'. A part of the output of the LPF51 is applied to a VCO45-4, and the pump frequency is kept double the signal frequency. COPYRIGHT: (C)1982,JPO&Japio | ||||||
| 64 | JPS5742233B2 - | JP10727177 | 1977-09-08 | JPS5742233B2 | 1982-09-07 | |
| 65 | Frequency selection unit | JP11701078 | 1978-09-22 | JPS5544245A | 1980-03-28 | OSHISHIBA TSUNEO; MINAGAWA SHIYOUICHI; OKAMOTO TAKESHI |
| PURPOSE: To prevent the change in the size of output caused by the phase relation between the pumping frequency and the input signal, by using unidirectional transducer as the surface acoustic wave transducer. CONSTITUTION: The phase unit 14 is connected between the input terminals 1' and 1" of the input transducer 1 to give suitable phase difference between the both terminals, and the transducer 1 produces sound only to left direction. Further, the phase unit 15 is connected between the input terminals 2' and 2" of the output transducer 2 to give suitable phase difference between the both terminals, and the transducer 2 detects sound only to right direction. Thus, while sound advances the pump electrode 3, the sound in frequency f i advancing right is produced with parametric mutual operation. When this propagates the pump electrode 4, the sound in frequency f s advancing left direction again with the parametric mutual operation is produced. COPYRIGHT: (C)1980,JPO&Japio | ||||||
| 66 | Elastic surface wave transducer | JP10727277 | 1977-09-08 | JPS5448492A | 1979-04-17 | OSHISHIBA TSUNEO; MINAGAWA SHIYOUICHI |
| 67 | JPS4952993A - | JP7273473 | 1973-06-27 | JPS4952993A | 1974-05-23 | |
| 68 | JPS4827512B1 - | JP11169270 | 1970-12-14 | JPS4827512B1 | 1973-08-23 | |
| 69 | JPS4838652A - | JP9006872 | 1972-09-09 | JPS4838652A | 1973-06-07 | |
| 70 | AUDIO AMPLIFIER | US13628431 | 2012-09-27 | US20130083947A1 | 2013-04-04 | Sven Moertel; Claus Renftle; Hermann Vogt |
| An audio amplifier may comprise a signal limiting circuit and a power amplifier. The signal limiting circuit may be configured to limit an audio signal received at an input and to provide it as a limited audio signal at an output. The power amplifier may have a supply connection which may be coupled to a power supply unit in order to supply power to the power amplifier. The power amplifier may be configured to amplify a signal, which may be based on the limited audio signal, and to provide it as a level-limited audio signal at an output which may be coupled to a load, so that the load may be operated at limited power. The signal limiting circuit may be configured to produce an audio signal which may be limited depending on the load. | ||||||
| 71 | Amplifier for converting charge signal | US10801390 | 2004-03-15 | US20040183398A1 | 2004-09-23 | Hajime Kashiwase; Hiromichi Watanabe; Hiroshi Yokoyama |
| A positive charge of a sensor element is charged in a signal converting circuit, is converted into a positive voltage, and is outputted. When the polarity of the charge of the sensor element is inverted to the negative and an output of the signal converting circuit is decreased, the leaked charges are superimposed and become the negative. An automatic correction circuit detects the negative output and discharges the charges so as to set the input to null0null. Thus, the offset of the signal level due to the charge leakage is automatically corrected. | ||||||
| 72 | Modifiable buffer circuit for miniature microphone applications and method of adjusting thereof | US10797507 | 2004-03-10 | US20040179703A1 | 2004-09-16 | Steven E. Boor |
| A method and system for adjusting the frequency response characteristics of a modifiable buffer circuit (100) is disclosed. The modifiable buffer circuit (100) being generally enclosed within a housing (316). Electrical signal connections for modifying the operating state of the modifiable buffer circuit (100) are accessible outside the housing (316). The modifiable buffer circuit (100) further includes a plurality of signal inputs (234) and outputs (230), the plurality of signal inputs (234) are accessible from outside the housing. A predetermined relationship exists between the plurality of signal inputs (234) and the plurality of outputs (230). A resistor network (224) is operably connected to the plurality of outputs (230) wherein a portion of the resistor network (224) is operably disconnected from a filter network (218) in response to the plurality of signal inputs (234). | ||||||
| 73 | Transducer assembly with modifiable buffer circuit and method for adjusting thereof | US10797804 | 2004-03-10 | US20040179702A1 | 2004-09-16 | Steven E. Boor |
| A method and system for adjusting the frequency response characteristics of a transducer assembly (312) is disclosed. The transducer assembly (312) includes a modifiable buffer circuit (100) being generally enclosed within a housing (314). Electrical signal connections for modifying the operating state of the modifiable buffer circuit (100) are accessible outside the housing (314). The modifiable buffer circuit (100) further includes a plurality of signal inputs (234) and outputs (230), the plurality of signal inputs (234) are accessible from outside the housing. A predetermined relationship exists between the plurality of signal inputs (234) and the plurality of outputs (230). A resistor network (224) is operably connected to the plurality of outputs (230) wherein a portion of the resistor network (224) is operably disconnected from a filter network (218) in response to the plurality of signal inputs (234). | ||||||
| 74 | Surface acoustic wave element and electronic circuit using the same | US09499467 | 2000-02-07 | US06198197B1 | 2001-03-06 | Kazuhiko Yamanouchi; Naohiro Kuze; Yoshihiko Shibata; Yasuhito Kanno |
| A surface acoustic wave functional element is provided that includes a piezoelectric substrate or a multilayer piezoelectric substrate having a large electromechanical coupling coefficient. Semiconductor layers are formed on the piezoelectric substrate. The semiconductor layers include an active layer and a buffer layer. The buffer layer is formed of a structure that has a lattice constant that is the same as or similar to that of the active layer. In addition, input and output electrodes are formed on both sides of the semiconductor layers. The surface acoustic wave functional element attains a large amplification gain at low voltage, and can be used as part of a transmitting/receiving circuit in a high frequency portion of a mobile communication device. | ||||||
| 75 | Receiver having a surface elastic wave high frequency amplifier with a frequency-controlled pump oscillator | US385361 | 1982-06-07 | US4426732A | 1984-01-17 | Masaharu Mori |
| Receiver comprising at least two output means taking out electric signals corresponding to sound waves propagating in different directions in a surface elastic wave amplifier disposed in the high frequency amplifier stage, wherein phase difference or frequency difference between outputs of said output means is detected and frequency of pumping electric power applied to said surface elastic wave amplifier is controlled in response to output thus detected. | ||||||
| 76 | Elastic surface wave device | US153238 | 1980-05-27 | US4334167A | 1982-06-08 | Shoichi Minagawa; Takeshi Okamoto |
| An elastic surface wave device having an input electrode, a pump electrode and an output electrode provided on a body of the device. The output electrode is juxtaposed with the input electrode on the body of the device on the same side with reference to the pump electrode and a multistrip coupler is provided between the pump electrode and the input and output electrodes so as to output, through the output electrode, a backward wave signal from the pump electrode. | ||||||
| 77 | Frequency selector apparatus | US74626 | 1979-09-12 | US4254388A | 1981-03-03 | Nobuo Mikoshiba; Shoichi Minagawa; Takeshi Okamoto |
| A frequency selector apparatus wherein unidirectional input and output surface-acoustic-wave transducers are provided in an acoustic wave propagation path formed on a piezoelectric device and reflecting electrodes, to which a.c. signals are applied respectively, are disposed in the acoustic wave propagation path on opposite sides of the transducers and adjacent thereto. | ||||||
| 78 | Acoustic surface wave signal processors | US46812674 | 1974-05-08 | US3898592A | 1975-08-05 | SOLIE LELAND P |
| An acoustic surface wave signal processor system finds application in acoustic surface wave multiplexer - demultiplexer apparatus and in acoustic surface wave filters affording selectable frequency and selectable band widths. The signal processor employs a plurality of phase controlling, multiple strip conductor, surface wave couplers placed on a piezoelectric substrate for directing the various frequency bands to spacedapart tracks on the substrate surface. The signals having thus been separated, the function of demultiplexing is performed; multiplexing may be accomplished by directing the signals through a similar surface wave system, but in the opposite sense. Arrangements for the control of amplifiers in the respective separated channels are used to convert the multiplexer demultiplexer system into a band pass filter having selectable frequency and band width characteristics.
|
||||||
| 79 | Apparatus for processing electromagnetic wave energy | US44031774 | 1974-02-07 | US3895324A | 1975-07-15 | MORGENTHALER FREDERIC R |
| A device for processing electromagnetic wave energy by converting the wave energy to spin waves and/or elastic waves, the present disclosure being particularly directed to the concept of providing a device made up of a single-crystal material which contains non-uniform material parameters to give graded values of material saturation 4 pi Ms. The material discussed in greatest detail is YIG and the non-uniform material parameters are furnished by doping the YIG with gallium. The graded material parameters in combination with an external magnetic bias field H result in an internal magnetic bias field H. The electromagnetic energy as it enters the material is acted upon in a manner that is influenced greatly by the contour of H. The contour of H in the present disclosure, in turn, is predetermined to present gradations in H which will allow the conversion mentioned and which allow predetermination of the wavenumber k of the magnons and/or phonons thereby formed. Furthermore, the place or space within the crystal at which conversion occurs can be somewhat determined by the profile of H thereby provided.
|
||||||
| 80 | Process and apparatus for the production of propagating electric alternating fields | US36371573 | 1973-05-24 | US3821667A | 1974-06-28 | THOMANN H |
| Propagating electric alternating fields are produced in a piezoelectric body in which an acoustic wave is coupled in by means of a transducer, the piezoelectric body having a permanently aligned surface polarization which is periodic in one region of its surface. The polarization is provided by the application of appropriate potentials to polarization electrodes in the form of interdigital electrodes which are temporarily applied to the body and subsequently removed, for example by etching. An acoustic wave having a wave length in the order of magnitude of the period of polarization of the surface polarization is coupled in and electric field components with differing phase velocities are produced in the region of the surface polarization in the space above the surface of the piezoelectric body, the phase velocity of one field component being considerably less than the phase velocity of the other field component. In one embodiment a piezoelectric ceramic body has an electromechanical transducer which serves for output coupling of acoustic waves and a semiconductor body is provided above the surface of the piezoelectric ceramic body in the region of the periodic permanent surface polarization for purpose of amplification. In another embodiment, two piezoelectric ceramic bodies having equal, permanently aligned, periodic surface polarization and each having an electromechanical transducer, are arranged in an overlapping close proximity relationship as an adjustable time delay device.
|
||||||
QQ群二维码
意见反馈
意见反馈