Abstract: A ribbon microphone circuit includes a ribbon microphone unit; a step-up transformer; buffer amplifier circuits connected to a secondary winding of the step-up transformer; an external power supply circuit as a power source for driving the buffer amplifier circuits; and a switch circuit including photo-relays having lights that are turned on while the external power source is being supplied and having contacts operating depending on states of the respective lights, wherein signals output from the ribbon microphone unit are sent through the buffer amplifier circuits while the external power source is being supplied, and sent without passing through the buffer amplifier circuits while the external power source is being not supplied.

Abstract: A capacitive transducer includes a substrate having a first surface and a second surface. The first surface of the substrate defines a first plane. The substrate has a cavity with an interior peripheral edge. The cavity extends between the first surface and the second surface. A body is provided that has an exterior peripheral edge. The body is parallel to the first plane and at least partially blocking the cavity. The body is connected to the substrate by resilient hinges such that, upon the application of a force, the body moves perpendicular to the first plane. A first set of comb fingers is mounted to the substrate. The first set of comb fingers is connected to a first electrical connection. A second set of comb fingers is mounted to the body and extends past the exterior peripheral edge of the body. The second set of comb fingers is connected to a second electrical connection that is isolated from the first connection.

Abstract: A microphone system has a base coupled with first and second microphone apparatuses. The first microphone apparatus is capable of producing a first output signal having a noise component, while the second microphone apparatus is capable of producing a second output signal. The system also has combining logic operatively coupled with the first microphone apparatus and the second microphone apparatus. The combining logic uses the second output signal to remove at least a portion of the noise component from the first output signal.

Abstract: A ribbon for a ribbon microphone having a magnet forming a magnetic gap, the ribbon which is arranged in the magnetic gap and is vibrated by a sound wave, an electrode for outputting an electric signal which is generated when the ribbon vibrates in the magnetic gap, and a frame for holding the magnet and the electrode; the ribbon has patterns of a large waveform which are formed so as to progress in a longitudinal direction of the ribbon and are formed so that ridge lines face a direction which perpendicularly crosses the longitudinal direction of the ribbon, and small patterns which are smaller than the patterns of the waveform and are formed along the longitudinal direction of the ribbon.

Abstract: A contact type electret condenser pickup to deliver high anti noise, top talking quality, and comprehensive range of applications includes a casing provided with an accommodation chamber to contain an O-ring, a vibration part, an insulation packing, a back plate retaining ring containing a back plate, a conductive connection ring, and a circuit board horizontally placed in sequence; vibration of a sound of a user is transmitted to the vibration part; then an inertia vibration of the metal sheet changes capacitance between the vibration part and the back plate; the changed vibration is converted through the circuit board set into voltage of alternating signals for output variable according to changes of vibration.

Abstract: An acoustic sensor includes a semiconductor substrate with a back chamber, a conductive diaphragm arranged on an upper side of the semiconductor substrate, an insulating fixed film fixed on an upper surface of the semiconductor substrate covering the conductive diaphragm with a gap, a conductive fixed electrode film arranged on the insulating fixed film facing the diaphragm, an extraction wiring extracted from the conductive fixed electrode film, and an electrode pad to which the extraction wiring is connected. The acoustic sensor converts an acoustic vibration to change electrostatic capacitance between the conductive diaphragm and the conductive fixed electrode film. A plurality of acoustic perforations are opened in a back plate including the insulating fixed film and the conductive fixed electrode film. An opening rate of the plurality of acoustic perforations is smaller in the extraction wiring and a region in the vicinity thereof than in other regions.

Abstract: A ribbon microphone unit includes a pair of magnets generating a magnetic field, a ribbon diaphragm disposed in the magnetic field generated by the magnets, and a circuit substrate provided with signal paths that conduct electrical signals generated by vibration of the ribbon diaphragm to output terminals. The signal paths are symmetrical about the longitudinal central axis of the ribbon diaphragm.

Abstract: The MEMS sensor according to the present invention includes a diaphragm. In the diaphragm, an angle formed by two straight lines connecting supporting portions and the center of a main portion with one another respectively is set to satisfy the relation of the following formula (1): (A2/A1)/(B2/B1)?1??(1) A2: maximum vibrational amplitude of the diaphragm in a case of working a physical quantity of a prescribed value on the diaphragm A1: maximum vibrational amplitude of the diaphragm in a case of working the physical quantity on the diaphragm in an omitting structure obtained by omitting one of the supporting portions from the diaphragm B2: maximum stress caused in the diaphragm in the case of working the physical quantity on the diaphragm B1: maximum stress caused in the diaphragm in the case of working the physical quantity on the diaphragm in the omitting structure.

Abstract: An acoustoelectric transformation chip for a ribbon microphone includes a diaphragm that has a vibrating region and two fixing regions disposed on two opposite sides of the vibrating region, and a voice coil film formed on the diaphragm. The voice coil film includes two rectangular voice coils, each of which has a plurality of first and second connection segments parallel to a direction of a magnetic field. A plurality of first and second transverse segments are perpendicular to the first and second connection segments and are connected between the first and second connection segments. The second transverse segments of each voice coil are disposed on one of the fixing regions. The first transverse segments of the two voice coils are disposed in the vibrating region.

Abstract: An electroacoustic transducer system for converting sound waves propagating from a musical instrument drum to an electric signal is generally provided. The system includes a housing, an electroacoustic transducer, and a cover. The housing includes a concave inner surface and a convex outer surface. In addition, the housing defines a housing cavity with a mouth. The electroacoustic transducer is disposed in the housing cavity and faces outwardly from the concave inner surface and towards the mouth to receive sound waves propagating from the drum. The electroacoustic transducer receives and converts the sounds waves in the housing cavity to the electric signal. The cover has a generally planar outer surface and extends over the mouth to at least partially enclose the electroacoustic transducer.

Abstract: A ribbon microphone includes two magnets spaced in parallel and generating a magnetic field therebetween, two ribbon diaphragms arranged in parallel at a predetermined distance in the magnetic field, and a step-up transformer raising the voltages of electric signals generated in response to vibrations of the ribbon diaphragms in the magnetic field and outputs the raised electric signals. The step-up transformer includes two primary windings and two secondary windings corresponding to the two ribbon diaphragms, one of the two ribbon diaphragms and one of the two primary windings of the step-up transformer are connected in parallel whereas the others are connected in parallel, and the two secondary windings of the step-up transformer are connected in series so as to have opposite polarities. The ribbon microphone exhibits enhanced shielding effect without shielding a step-up transformer and does not generate noise caused by electromagnetic induction.

Abstract: According to an embodiment of the disclosure, an acoustics transducer is provided, which includes a support substrate having an upper surface and a lower surface, the upper surface including a first portion and a second portion surrounding the first portion, a recess extending from the upper surface towards the lower surface, the recess is between the first portion and the second portion of the upper surface, a vibratable membrane disposed directly on the recess, the vibratable membrane including a fixed portion fixed on the support substrate and a suspended portion, and a back plate disposed on the support substrate and opposite to the vibratable membrane. The suspended portion has an edge extending substantially along with an edge of an opening of the recess. The suspended portion is separated from the first portion and the second portion of the upper surface by an inner interval and an outer interval, respectively.

Abstract: A composite membrane acoustic transducer structure comprising a magnet assembly is arranged adjacent the composite membrane material. The magnet assembly is arranged to produce a flux field. A first layer of thin, elongate composite membrane material is held under tension. A second conductive layer is attached to the first layer of composite membrane material wherein the first and second layers of membrane material are arranged adjacent, generally parallel and offset from the magnet assembly. The assembly is arranged to produce the flux field through at least part of the first layer and the second layer.

Abstract: A ribbonned microphone assembly, for adjustable sound receiving capabilities, including a transducer having a surrounding flux frame for positioning at least two magnets adjacent a suspended ribbon between the magnets. An array of receiving apertures is arranged in the flux frame. At least one curved return ring positioned in the receiving apertures to create a return path for magnetic flux in the transducer.

Abstract: A ribbon microphone unit includes a permanent magnet that forms a magnetic field and a ribbon diaphragm that is disposed in the magnetic field and vibrates upon receiving a sound wave. An elastic layer made of synthetic resin is formed at least at a portion of the ribbon diaphragm, the portion vibrating upon receiving the sound wave. Preferably, the ribbon diaphragm is formed into triangular waves with the portion vibrating upon receiving sound waves being alternately folded along lines in a width direction across the entire length. The elastic layer may be formed on one or both surfaces of the ribbon diaphragm and may be provided only at both side ends of the ribbon diaphragm.

Abstract: A microphone includes a housing; a back volume within the housing; a diaphragm within the housing; a backplate attached to the housing; and a diaphragm ring connected to the diaphragm. The diaphragm ring has a body defined by an outer perimeter and at least a first inner perimeter and a second inner perimeter adjacent the first inner perimeter. The first inner perimeter is adjacent to a top surface of the diaphragm ring. The second inner perimeter is adjacent to the bottom surface of the diaphragm ring. The second inner perimeter is smaller than the first inner perimeter.

Abstract: The present invention provides electroactive polymer transducers that produce out-of-plane deflections. The transducers form a set of surface features based on deflection of an electroactive polymer. The set of surface features may include elevated polymer surface features and/or depressed electrode surface features. Actuation of an active area may produce the polymer deflection that creates one or more surface features. A passive layer may operably connect to a polymer. The passive layer may comprise a thicker and softer material to amplify polymer thickness changes and increase surface feature visibility.

Abstract: A capacitive microphone and method of fabricating the same are provided. One or more holes can be formed in a first printed circuit board (PCB). A diaphragm can be surface micro-machined onto an interior surface of the first PCB at a region having the one or more holes. Interface electronics can also be interconnected to the interior surface of the PCB. One or more spacer PCBs can be attached to a second PCB to the first PCB, such that appropriate interconnections between interconnect vias are made. The second PCB and first PCB with spacers in between can be attached so as to create a cavity in which the diaphragm and interface electronics are located.

Abstract: Cells can include variable volumes defined between a flexible structure, such as a polymer layer, and a support surface, with the flexible structure and support surface being attached in a first region that surrounds a second region in which they are unattached. Various adhesion structures can attach the flexible structure and the support surface. When unstretched, the flexible structure can lie in a flat position on the support surface. In response to a stretching force away from the support surface, the flexible structure can move out of the flat position, providing the variable volume. Electrodes, such as on the flexible structure, on the support surface, and over the flexible structure, can have charge levels that couple with each other and with the variable volume. A support structure can include a device layer with signal circuitry that provides a signal path between an electrode and external circuitry. One or more ducts can provide fluid communication with each cell's variable volume.

Abstract: An acoustoelectric transformation chip for a ribbon microphone includes a diaphragm that has a vibrating region and two fixing regions disposed on two opposite sides of the vibrating region, and a voice coil film formed on the diaphragm. The voice coil film includes two rectangular voice coils, each of which has a plurality of first and second connection segments parallel to a direction of a magnetic field. A plurality of first and second transverse segments are perpendicular to the first and second connection segments and are connected between the first and second connection segments. The second transverse segments of each voice coil are disposed on one of the fixing regions. The first transverse segments of the two voice coils are disposed in the vibrating region.

Abstract: A ribbon for a ribbon microphone having a magnet forming a magnetic gap, the ribbon which is arranged in the magnetic gap and is vibrated by a sound wave, an electrode for outputting an electric signal which is generated when the ribbon vibrates in the magnetic gap, and a frame for holding the magnet and the electrode; the ribbon has patterns of a large waveform which are formed so as to progress in a longitudinal direction of the ribbon and are formed so that ridge lines face a direction which perpendicularly crosses the longitudinal direction of the ribbon, and small patterns which are smaller than the patterns of the waveform and are formed along the longitudinal direction of the ribbon.

Abstract: The present invention provides electroactive polymer transducers that produce out-of-plane deflections. The transducers form a set of surface features based on deflection of an electroactive polymer. The set of surface features may include elevated polymer surface features and/or depressed electrode surface features. Actuation of an active area may produce the polymer deflection that creates one or more surface features. A passive layer may operably connect to a polymer. The passive layer may comprise a thicker and softer material to amplify polymer thickness changes and increase surface feature visibility.

Abstract: A ribbon microphone unit includes: an electrode lead portion for conducting an electric signal which a ribbon diaphragm generates cooperating with a magnet; a tightening member for securing the ribbon diaphragm; and a screw for crimping the tightening member, wherein the tightening member is crimped via the ribbon diaphragm and the electrode lead portion by the screw, and wherein the ribbon diaphragm includes a portion sandwiched by the tightening member, and the portion is formed in an irregular shape in the thickness direction.

Abstract: To obtain a ribbon microphone unit, which makes the tension of a diaphragm adjustable by configuring a ribbon diaphragm assembly that is detachable to a magnetic-circuit assembly including a magnet, and which further allows a user side to carry out the maintenance by replacing the ribbon diaphragm assembly; a ribbon microphone unit comprises: a magnetic-circuit assembly including a magnet; and a ribbon diaphragm, wherein the ribbon diaphragm, together with a substrate having a circuit pattern formed on both ends thereof, a metal fitting for crimping an end portion of the ribbon diaphragm to the circuit pattern, and a screw for crimping the metal fitting toward the substrate, constitute a diaphragm assembly, and wherein the diaphragm assembly is secured to the magnetic-circuit assembly.

Abstract: A ribbon microphone includes a diaphragm made of an aluminum foil. To provide a corrosion resistance and a favorable electrical connection in the junction between the aluminum foil and backplates for a long time, a gold deposited film is formed on opposite surfaces of the diaphragm. Preferably, a gold deposited film is also formed on the inner surfaces of electrode plates attached to each end of the diaphragm.

Abstract: A micromachined microphone or speaker embedded within, or positioned on top of, a substrate suitable for carrying microelectronic chips and components. The acoustic element converts sound energy into electrical energy which is then amplified by electronic components positioned on the surface of the substrate. Alternatively, the acoustic element may be driven by electronics to produce sound. The substrate can be used in standard microelectronic packaging applications.

Abstract: A composite membrane acoustic transducer structure comprising a magnet assembly is arranged adjacent the composite membrane material. The magnet assembly is arranged to produce a flux field. A first layer of thin, elongate composite membrane material is held under tension. A second conductive layer is attached to the first layer of composite membrane material wherein the first and second layers of membrane material are arranged adjacent, generally parallel and offset from the magnet assembly. The assembly is arranged to produce the flux field through at least part of the first layer and the second layer.

Abstract: An inductor-based integrated MEMS microphone and a method of making the microphone is provided. The microphone structure includes a vibrating inductor that is suspended over another stationary inductor such that the magnetic field induced from one inductor induces an electrical potential across the other. The stationary inductor is embedded in a dielectric material that is etched out over the stationary inductor to provide the cavity over which the vibrating inductor is suspended.

Abstract: A flat acoustic conversion device includes two magnets disposed so that their magnetic poles face upward arid are adjacent to or in contact with one another, and the magnetic pole faces of different polarities arc disposed alternately; a vibrating member disposed on the top surface of the yoke; coil pairs wound in helical form and disposed at front and reverse surfaces of the vibrating membrane; such that magnetic flux traveling in a direction substantially parallel to a surface of the vibrating membrane becomes a maximum, and interlinks with the coil pairs. When current is supplied to the coils, a direction of force which the current receives from a magnetic field is substantially orthogonal to the surface of the vibrating membrane, and force in a direction along the surface of the vibrating membrane becomes extremely low. Thus, noise components can be reduced such that sound quality can be improved.

Abstract: A micromachined capacitive acoustic transducer including an electrode formed by a perforated plate and another electrode formed by a shallowly corrugated membrane anchored at one or more positions on the substrate which also supports the said perforated plate is described. Also disclosed includes: a fixed perforated plate; a movable shallowly corrugated membrane having holes to form acoustic filter to a certain frequency or a range of frequencies spaced from the perforated plate that is anchored in one or more location but loose at other locations; a support structure in the perforated plate maintaining the minimum separation between the membrane and the perforated plate near the perimeter.

Abstract: An electro-dynamic loudspeaker is typically provided with a diaphragm mounted to a frame in tension. The diaphragm is provided with a plurality of electrical traces that are disposed within a magnetic field of a plurality of magnets that are mounted to the frame. Electric current applied to the circuit causes electric current to pass through the wiring that interacts with the magnetic field of the magnets to thereby cause vibration of the diaphragm that causes the sound generated by the electro-dynamic loudspeaker. Electrical connector arrangements and methods are provided for connecting the electric circuit of the diaphragm to a power amplifier.

Abstract: A planar electro-acoustic transducer has an adjustable back cap option that provides a dipole/monopole radiation that has different roll-off characteristics. The planar electro-acoustic transducer includes a diaphragm and a plurality of front and rear magnetic bars. Each magnetic bar has a side facing the diaphragm and disposed adjacent thereto. The thickness of each rear magnetic bar is larger than the thickness of each front magnetic bar. The thickness of each front magnetic bar is less than a quarter-wavelength of a cavity resonance at 10 kilohertz. The planar electro-acoustic transducer also includes a non-magnetic acoustically transparent metallic mesh that is disposed coplanarly with the sides of the front and rear magnetic bars that face the diaphragm.

Abstract: A planar-magnetic electro-acoustic transducer including a support structure and a magnetic structure carried by the support structure, the magnetic structure comprising a multiplicity of high-energy magnets configured so as to have shared loop field maxima and local loop field maxima, and a diaphragm carried by the support structure, comprising a plurality of conductors carried by and coupled to the diaphragm, said conductors being disposed in relation to local loop maxima and configured to exploit the energy of local loop maxima, as well as the energy of shared loop maxima in driving the diaphragm to produce an acoustic output; and the magnetic structure can be configured so that it includes magnet rows, and the transverse cross-sectional width of the magnets does not exceed their transverse cross-sectional height, and the distance between adjacent elongated magnet rows is greater than one half the width of either of the magnets of the adjacent magnet rows.

Abstract: A new type of diaphragm transducer comprising magnets to provide magnetic field strength in a planar region and a planar diaphragm located in the said planar region. The diaphragm has a plurality of conductors on its planar surface for inducing electromagnetic forces acting on theses conductors in said planar region when current flows through said conductors. The magnets are arranged in magnetic interaction with a magnetically conducting material, preferably soft iron, to conduct magnetic field from said magnets to said planar region.

Abstract: A loudspeaker module in the form of a ribbon element, where the module can be equipped with a membrane, 50 millimeters in width or narrower, and with any length from 50 millimeters to 2500 millimeters. The magnet system is equipped with so called booster-magnets in order to reduce loss of magnetic flow in the soft iron pole pieces and in order to equalize and in order to even the magnetic flow at the magnet ends. The signal-feed is designed in the form of passive current-feeding, whereby the inductance's negative impact of the frequency response up to the 1/f point is eliminated. Above the 1/f point, the ribbon membrane is compensation fed from a separate circuit consisting of R and C, whose values have been chosen in such a way that the resulting frequency response is flat over the whole operating area.

Abstract: An acoustical speaker and planar magnetic transducer therefore wherein the transducer is provided with at least array of spaced magnets which are oriented having their pole faces at an angle with respect to a plane defining a surface of a sound producing diaphragm on which extends an electrical trace circuit.

Abstract: An electrostatic speaker system is provided wherein a multitude of speakers are provided in the system, each speaker having a thin electrically conductive film membrane sandwiched between a pair of stator plates. The film membrane is directly coupled to a high voltage AC audio signal emanating from a power amplifier for reproducing an audio signal. The high voltage AC audio signal is not applied to the stator plates but instead indirectly coupled to the pair of stators by a plurality of condensers (in a voltage multiplier circuit) of a electrical circuit contained within each speaker of the system. By applying the high voltage AC audio signal to the film membrane, approximately one-quarter of the voltage typically used to drive an electrostatic speaker is required.

Abstract: This invention is a loudspeaker that consists of some vibratory membranes and magnets. Every vibratory membrane is a part of a soft conductive tape and is put in a magnetic field. When the membranes conduct audio current, they vibrate air directly with their surfaces, and produce sound waves. This loudspeaker can be made into various shapes. It has overcome the defect of sound distortion caused by the diaphragm deformations in regular loudspeakers. Its distortion is lower, its transient response is excellent, and its voice quality and acoustic effects are admirable.

Abstract: A condenser microphone has a conductive diaphragm 3 having an earth electrode layer 31 formed of a conductive light metal; a conductor fixed electrode 5 arranged opposite to the conductive diaphragm 3 through an air layer; an organic dielectric layer 32 formed of the organic compound provided on the boundary surface 32C side between the air layer and the conductive diaphragm 3; and a permanent electric charge layer 32A composed of ions or electrons formed in the inner portion side receding from the air layer 8side, from a middle position in the thickness direction of the organic dielectric layer 32 in the inside of the organic dielectric layer 32.

Abstract: A flexible ribbon speaker is disclosed. A flexible conductive membrane is placed within an appropriately shaped magnetic field formed by a flexible magnet assembly in such a way that current passing through the membrane interacts with the magnetic field, causing the membrane to vibrate and produce sound. The design of the membrane and of the magnet assembly, along with additional structural elements allows the speaker to be bent. Due to its flexibility, the ribbon speaker of the invention can be located in places that were hitherto inconvenient.

Abstract: A ribbon microphone having magnets positioned adjacent north and south pole pieces. The magnets are of uniform thickness along their lengths, and do not taper. The pole pieces are substantially the same width as the magnets. An offset ribbon is disposed in an air gap between the pole pieces. The offset ribbon is not centered in the air gap, but rather is offset from a center line which bisects the magnets and pole pieces. The offset ribbon is located closer to the front of the microphone than the back of the microphone. The flux area is uniform and corresponds to the area of the air gap between the pole pieces.

Abstract: An electrostatic speaker device, comprising a first foam stator having an interior surface, and a second foam stator having an interior surface positioned adjacent to the interior surface of the first stator. The interior surfaces of the first and second foam stators include electrically conductive cellular structure sufficiently small in cell size to develop a substantially continuous electrostatic charge dispersion across the respective first and second interior surfaces. At least one diaphragm is disposed between the first and second foam stators and includes an electrically conductive layer responsive to electrostatic forces developed by the respective first and second stators.

Abstract: A method and a pulse pressure sensor for sensing an arterial pulse pressure waveform. In one embodiment, the pulse pressure sensor includes a housing, a diaphragm, a piezoelectric device, and a self-contained amplifier. The skin-contact diaphragm is attached across a recess or opening in the housing. The piezoelectric device has a first portion mounted in a fixed relationship to the housing and a second portion displacementally coupled to the diaphragm. The solid-state amplifier has a signal input coupled to the piezoelectric device, wherein the piezoelectric device and amplifier together have a frequency response at least including a range from below approximately 0.1 hertz to above approximately 250 hertz. In one such embodiment, the housing and the skin-contact diaphragm of the sensor are stainless steel. In one such embodiment, the diaphragm has a skin-contact surface with a skin-contact dimension of between approximately 0.4 inch and 0.6 inch.

Abstract: This invention describes an acoustic transducer, either speaker or microphone, that uses an aerogel diaphragm or an aerogel acoustic interface made of magnetic aerogel or conductive aerogel or both. In the case of a speaker, the aerogel diaphragm is directly driven either by electromagnetic or electrostatic means to reproduce high fidelity sound. In the case of a microphone, the aerogel diaphragm is modulated by acoustic energy, and in turn, the aerogel diaphragm electromagnetically or electrostatically modulates a field detection element resulting in a high fidelity electrical audio signal output.

Abstract: An electret condenser microphone includes a cup-shaped metallic case having an apertured end wall, a tubular metal ring received in the metallic case, a vibratory diaphragm having on its one surface a deposited metal film and bonded to an end face of the tubular metal ring in confronting relation to the end wall with an air gap defined therebetween, and a condenser composed of a movable electrode and a fixed counter electrode, the fixed counter electrode comprising at least a part of the end wall of the metallic case while the movable electrode comprises the vibratory diaphragm. Partly because the end wall of the metallic case serves as the fixed electrode, and partly because the vibratory diaphragm is bonded to the end face of the metal ring, the number of the components of the microphone is relatively small.

Abstract: A whole-surface driven speaker includes first and second support plates having sound-passing perforations and groups of magnets mounted on the plates. The plates are substantially parallel to each other. A diaphragm is disposed in between the plates. A plurality of conductor strips are mounted on the surface of the diaphragm. The strips are connected to receive pulse-code modulated signals. The strips respectively correspond to a plurality of binary bits of the signals of different bit significance. Each strip has a predetermined width and a predetermined number of windings and carries a predetermined current magnitude such that electromechanical forces on the diaphragm caused by the bit signals flowing through the strips are proportional to the respective bit significance of the strips.

Abstract: A metallic glass ribbon of the formulaFe.sub.w B.sub.x Si.sub.y C.sub.zwherein0.78.ltoreq.w.ltoreq.0.83,0.13.ltoreq.x.ltoreq.0.17,0.03.ltoreq.y.ltoreq.0.07,0.005.ltoreq.z.ltoreq.0.03,andw+x+y+z=1,is annealed to remove mechanical strains and exposed to a magnetic field in the plane of the ribbon and transverse to the long axis of the ribbon. The resulting metalic glass ribbons have very large magnetic coupling coefficients (k.sub.33 >0.9). The treated ribbons are useful in magnetostrictive transducers and in passive listening devices such as hydrophones or pressure sensors.