Abstract: A pair of spectacles has a frame and two lenses. The frame has a skeleton and a bridge formed between the skeleton and dividing the skeleton into two symmetrical members. Two first lugs are transversely formed in a distal end of the skull and adjacent to the bridge, and two second lugs are uprightly formed in a free end of the skull and opposed to the bridge. Two lenses are respectively mounted on the members and respectively have a first channel and a second channel defined in a periphery of the lenses. Two first tabs and two second tabs are respectively mounted on the lenses and the frame in turn, whereby the lenses are securely provided on the frame with easy assembly.

Abstract: Eyeglasses have a lens member, a frame member and two temples. The lens member includes opposite front and rear lens surfaces, two through holes at left and right ends of the lens member, and an insert hole disposed between the through holes. The frame member includes a middle frame portion abutting against the front lens surface of the lens member, two retaining frame portions formed respectively on left and right ends of the middle frame portion and extending respectively through the through holes in the lens member, and an insert bar extending rearwardly from the middle frame portion and inserted into the insert hole in the lens member. The retaining frame portions abut against the rear lens surface of the lens member. The temples extend respectively and rearwardly from the retaining frame portions of the frame member.

Abstract: Eyewear having an interchangeable single lens, that can be replaced quickly and easily, is provided. The eyewear is particularly suitable for use as safety eyeglasses. The eyewear includes a unitary frame structure having an inner and outer surface. The frame includes a brow bar portion extending laterally across the brow of the wearer, a nose bridge portion depending downwardly from the brow bar, first and second outer temple portions at the outer ends of the brow bar, and lower lens frame portions. The structural frame portions are preferably molded from a relatively rigid plastic material. To provide for attachment of the lens to the frame, the first and second outer temple portions each include a molded elastomeric inset including a post-receiving aperture for receiving a complementary mounting post formed on the lens. Additionally, the nose bridge portion or the center of the brow bar may also include a locking mechanism for holding the lens in position in the central area.

Abstract: An eyewear device includes a frame having two elongate extensions rotatably attached to the frame and movable between a deployed position and a stored position. The frame has two lens receiving portions with multiple lens units insertable in the lens receiving portion some through the front surface and some through the rear surface. The lens units have different eye glass lenses held therein. The elongate extensions include at least one head grip that is movable between two positions in which the head grip extends away from the stem, extensions, ears or temples different distances. A retainer is provided to hold the eyewear to the head; and a leash is provided to secure the eyewear to the clothing. The lens receiving portions have ridges that are configured to interact with grooves in the lens units to hold them in the frame. including a peripheral encasing. The lens units may have a nose piece with a nose pad configured to be removable and to adjust the distance of the nose pad from a support surface.

Abstract: Novel eyewear are disclosed which comprise a lens and a sealing frame. The lens is adapted to cover at least one of a user's eyes. The frame has an adhesive side and is disposed adjacent the perimeter of the lens. A first portion of the adhesive side is disposed at the perimeter of the lens forming a seal between the frame and the lens. A second portion of the adhesive side extends laterally beyond the perimeter of said lens to provide adhesive attachment of the eyewear to the face of the user.

Abstract: Safety eyewear (10) having interchangeable lens(es) (28,30) is provided. To provide for interchange of the lenses (28,30) in the frame (12), upper and lower frame members (32,34) are molded from a harder, more rigid plastic while lateral temple portions (20,22), and a central nose bridge portion (18) are molded from a softer, more elastic material. The entire frame structure (12) is preferably molded as a unitary piece to form a unitary frame having rigid upper and lower frame portions (32,34) joined by flexible intermediate portions (18,20,22). In this regard, the upper and lower frame portions (32,34) can be flexed or stretched relative to each other to temporarily separate the frame portions (32,34) and open up the lens openings (24,26).

Abstract: A pair of self-assembly glasses includes a frame, a fixing member and a lens suit. The frame includes a body and a pair of arms pivotably connected to opposite sides of the body. The body is made through integral molding. A number of positioning holes are defined in the body. The fixing member is made through integral forming. The fixing member includes a pair of fixing portions with a plurality of positioning holes defined therein respectively. A number of positioning holes are defined in the lens suite corresponding to the positioning holes of the body. Thus, it is ready to assemble or disassemble the self-assembly glasses through the positioning holes of the lens suite, the fixing member and the frame.

Abstract: The present invention relates to a pair of eyeglasses comprising a pair of temples; a frame comprising two forward peripheral grooves either including two spaced first tabs at a nosepad portion of the frame, and a second tab at an endpiece portion of the frame; and a pair of lenses either comprising two spaced first apertures at its inner side and a second aperture at its outer side. The first apertures are adapted to lockingly engage with the first tabs and the second apertures are adapted to lockingly engage with the second tabs respectively in response to snapping the lenses onto the grooves. The assembly or disassembly of the lenses is fast and easy.

Abstract: Eyewear is provided with an exchangeable lens retaining member which is removably attached to a lens to form a lens unit. The lens unit is detachably secured to the main frame of the eyewear such that the lens unit extends downwardly from the main frame. At least a section of the lens retaining member provides a spacing between a bottom of the main frame and the lens, where vent passages are defined.

Abstract: The present invention provides eye protection systems. The eye protection systems include a lens capable of being mounted in and being interchangeable between a plurality of different lens-mounting platforms. These platforms may include spectacles or goggles with release mechanisms, which permit the lens to be removed while providing full ballistic protection when installed in the platform. The lens of the present invention protects against a plurality of threats including spectrums of light, such as sun light, ultraviolet light, or laser light, wind, dust, projectiles, etc. The lens may include a laminate structure, which protects sensitive technologies from exposure to environmental conditions, such as chemicals, weather, etc.

Abstract: The present invention provides a method and structural arrangement for permanently attaching lenses to a pair of eye glasses which include a frame structure made of substantially rigid plastic material. The attachment of the lenses to the frame structures of eye glasses is achieved during the formation of the frame structures. A variety of engaging structures between the lenses and a frame body can be formed together with the formation of frame structure in a plastic formation molding procedure.

Abstract: A pair of improved eyeglasses is disclosed. The eyeglasses comprises a first frame including a left opening and a right opening, a detachable second frame including two lenses aligned with the openings, a projected rim, a groove surrounded by the rim with the first frame being fitted therein by snapping, and two pairs of an upper tab and a lower tab forward the groove by a predetermined distance for fastening the first frame at the groove, and two temples pivotably coupled to ends of the first frame.

Abstract: The protective eyewear assembly described comprises a frame having right and left portions defining respective right and left apertures and a central bridging portion, and a protective lens piece adapted to be mounted to the lens piece between the upper and lower edges of the frame. The lower edge of the frame has a retaining wall for retaining the lens therein while the upper edges of the frame and the lens piece have cooperating portions to secure the lens to the frame. The frame may be made of flexible plastic material to enable a snap-in engagement and a snap-out disengagement of the lens to and from the frame.

Abstract: Spectacles, frames and methods for providing the same are disclosed. The frames have a shape adapted for engagement of wrap-around lenses having significant changes in base curvature in the field of vision of the wearer.

Abstract: An eyeglasses includes a lens part, and a frame having a front; the lens part has rearwards extending wings at two ends, and an engaging hole on a middle; each wing has a slot having rear and front sections; the front has a post fitting with the engaging hole, and insertion portions fitting with the slot rear sections on inward sides of two folded ends; stopping portions are formed on the insertion portions, and are shaped such as to be passable through the slot front sections; the stopping portions are longer than the slot rear sections such that the lens can be firmly coupled to the front by means of displacing the lens part rewards relative to the front to insert the post in the engaging hole and fit the insertion portions in respective slot rear sections after the stopping portions have been passed through respective slot front sections.

Abstract: In the past with a person who wore eyeglasses and had to be on oxygen at the same time, usually that person would have to wear the arms from the eyeglasses and the airtube that carries the oxygen to their nose on their ears simultaneously. What I'm proposing is, combine eyeglass frames and the tube that carries the oxygen together. How that would be done is, making the eyeglass frames hollow, starting from the arms of the glasses, around the eye pieces, down below to the nipples that would connect to the nose piece, and finally in the nostrils. With this combination a person could wear glasses and breath with the oxygen at the same time with more ease. That makes for less adjustment, and it's much less frustrating than the old way.

Abstract: A pair of eyeglasses includes two frames each having a cutout defined in an outer periphery of the frame, two temples each pivotally connected to a corresponding one of the two frames and by a boss sandwiched between each of the temple and the corresponding frame, a bridge securely bridging the two frames together by an extension sandwiched between the bridge and a corresponding one of the two frames, two lenses each connected to a corresponding one of the two frames and having two notches oppositely defined in a side of the lens to respectively correspond to the extension and the boss and an indentation defined adjacent to one of the two notches to align with the cutout of the frame, and a positioning arm pivotally connected to the two frames to selectively combine the frames and the lenses.

Abstract: A single eyeglasses lens and a metal frame includes a single eyeglasses lens having a center hole for a center projection of a metal frame to fit firmly therein, and two grooves formed in two opposite sides to engage with two projections formed in two ends of an intermediate portion of the metal frame to assemble with the single eyeglasses lens stably and elastically without using no screws. The metal frame is made of a light and flexible metal, having two ends connected to two temples able to be expanded outward and bent inward.

Abstract: This invention refers to a way of producing frames for glasses of different types but all with the characteristic of lacking in weldings and in the hinge that normally joints the frontal with the bars since such a purpose has been absolved by the elasticity of the material. During the same production process also the exhibitor for the point of sale will be realized, thereby reducing costs, times and wastes. Besides, with a couple of spectacle or sun lenses, even if expensive, it will be possible to preserve them, while the frame will be replaced by a different one compatible with the couple of lenses. Frontal, bars and nose pads, that is all the structure of the glasses, are made at the same time from one metallic plate. Through different techniques such as the laser cut, the electric erosion and above all the photo-chemical etching technique, the metallic plate is worked and subsequently is folded up in the suitable way to achieve the definitive shape.

Abstract: This invention refers to a way of producing frames for glasses of different types but all with the characteristic of lacking in weldings and in the hinge that normally joints the frontal with the bars since such a purpose has been absolved by the elasticity of the material. During the same production process also the exhibitor for the point of sale will be realized, thereby reducing costs, times and wastes. Besides, with a couple of spectacle or sun lenses, even if expensive, it will be possible to preserve them, while the frame will be replaced by a different one compatible with the couple of lenses. Frontal, bars and nose pads, that is all the structure of the glasses, are made at the same time from one metallic plate. Through different techniques such as the laser cut, the electric erosion and above all the photo-chemical etching technique, the metallic plate is worked and subsequently is folded up in the suitable way to achieve the definitive shape.

Abstract: The invention relates to spectacles with a wire frame where the frame has a mounting structure for the lenses and two sidepieces connected to the mounting structure by a hinge portion. According to the invention, the mounting structure of the two lenses has loops made in it, each loop being elastically deformable in such a way that it can elastically and temporarily vary the amplitude of the area enclosed by the mounting perimeter of the frame relative to the corresponding edge of the lens so as to facilitate the fitting of the lenses in the frame rims.

Abstract: Spectacle frames having one or more components such as a bridge, nose rests and ear pieces of martensitic NiTi, NiTi nobium, NiTi iron alloy made by means of plastic deformation starting from a 20% work hardening raised by hammering up to 50% so that the final section of the material so treated maintains, within a range of temperatures from −50° C. to +70° C., sufficient elasticity and flexibility for adapting the frames to the different facial forms of users.

Abstract: The present invention relates to an eyeglasses assembly comprising: a frame, two temples and a lens unit. The frame comprises: a transverse rod, a first groove, a second groove, an extension plate, a supporting plate and an arcuate plate. The transverse rod has a middle portion and two ends for connecting to the temples. The middle portion has a flange extending downward. The extension plate is connected to the middle portion and extends downward. The supporting plate is connected to the extension plate. The arcuate plate is connected to the supporting plate and extends downward from the supporting plate. The first groove is formed between the flange and the extension plate. The second groove is formed between the extension plate and the arcuate plate. The lens unit comprises two lenses and a connecting portion for connecting the two lenses. The connecting portion has an arcuate under edge and an upper edge.

Abstract: A glasses' front frame having a V-shaped groove 5 which receives a locking ledge stripe 1c, having a V-shaped cross section, around a circumference of a lens. There are formed a first frictional biting-into protrusion stripe 6a and a second frictional biting-into protrusion stripe 6b, respectively, on a first inclined bottom surface 5a and a second inclined bottom surface 5b defining the V-shaped groove 5. The first and second frictional biting-into protrusion stripes 6a, 6b extend in a direction in which the glasses' front frame extends, locate near upper edges of the first inclined bottom surface 5a and the second inclined bottom surface 5b defining the V-shaped groove 5, and contact a part of a first inclination bottom surface 1a of the locking ledge 1c of the lens 1 and a part of a second inclination bottom surface 1b thereof.

Abstract: The central piece of a full-rim eyeglass frame includes a left full rim (2) for receiving a left lens, a right full rim (4) for receiving a right lens, a bridge (6) joining the two full rims, and two endpieces (8, 10). The two full rims, the bridge and the two endpieces are integrally formed as a single piece, from a plastic. The two full rims (2, 4) are flexible, and are constituted by a closed, elastic band. The central piece of the full-rim frame is assembled into a central piece of a pair of eyeglasses with two lenses, whose outer circumferential lines have somewhat larger dimensions than the inner contour lines of the two full rims, so that the full rims of the central piece of the eyeglasses are stretched around the lenses, and their shape conforms to the shape of the lenses.

Abstract: A pair of glasses includes a frame including two eyewires. A lens is removably received in each eyewire. A rod is pivotally mounted to a periphery of each eyewire and includes an end that is movable between a first position for retaining an associated lens in an associated eyewire and a second position allowing removal of the associated lens. In an alternative embodiment of the invention, a rod is pivotally mounted between the eyewires and includes two ends. Each end of the rod being movable between a first position for retaining an associated lens in an associated eyewire and a second position allowing removal of the associated lens. At least one protrusion is provided to prevent excessive pivotal movement of the rod.

Abstract: The present invention provides a system, apparatus, and method for preventing Computer Vision Syndrome (CVS) that addresses the various causes of CVS. To help maintain a proper preocular tear film the present invention provides a device to generate a blink reminder signal and a blink indicator, such as a light, a speaker, or a portion of a display monitor, to communicate the blink reminder signal to the computer user. The device may incorporate feedback devices such as a blink monitor, a temperature monitor, a humidity monitor, an elapsed time monitor, or a clock. The present invention also provides an eye enclosure that defines an enclosed area about the computer user's eye that is at least partially enclosed. The invention incorporates components aimed at optimizing the environment within the enclosed area. For example, air moisteners communicating with the enclosed area maintain a relatively high humidity within the enclosed area and reduce the evaporation of fluid from the eyes.

Abstract: A unitary structure for an eye covering comprises an outer hard portion chemically bonded to an inner soft portion made by a two-shot process in a single mold.

Abstract: A quick release glasses lens comprises a main frame and lens. The main frame comprises a front rod in arc shape having two legs secured to its two ends, respectively. The center part of the front rod is formed with a clip having recess at its edge, and a trough inside of the recess. The rod further comprises a pair of protuberances at respective sides, each protuberance has a stopper at the front end, the lens have a thickness which is to be fitted into the width of the recess, a hole corresponding to the protuberance, and a protuberance which is to be inserted into the trough of the recess for positioning the lens at place.

Abstract: A system for attaching optical frames and lenses is described which provides positive, reversible attachment without rims, cords, or screws. The mating is performed with a mechanical closure onto a receiving portion of the lens which has been formed as the mating piece for the closure device. Lenses may be changed and adjusted in a straightforward manner and the resulting device presents a clean, fashionable appearance without the need for structural rims, cords, or screws.

Abstract: Eyewear having easily removable lenses is provided with a frame that defines a first lens receiving recess on one side of a lens opening and a second lens receiving recess on a second side of the lens opening. Each lens has a first tab portion which corresponds with the first recess and a second tab portion which corresponds to the second recess and is mounted by placing the first tab portion in the first recess and the second tab portion in the second recess. Engagement between the respective tab portions and recesses maintains the lenses in the mounted position. To more securely lock each lens in position, a pivot member having a locking tab can be pivoted into a locking position in which the locking tab engages the lens.

Abstract: The central piece of a full-rim eyeglass frame includes a left full rim (2) for receiving a left lens, a right full rim (4) for receiving a right lens, a bridge (6) joining the two full rims, and two endpieces (8, 10). The two full rims, the bridge and the two endpieces are integrally formed as a single piece, from a plastic. The two full rims (2, 4) are flexible, and are constituted by a closed, elastic band. The central piece of the full-rim frame is assembled into a central piece of a pair of eyeglasses with two lenses, whose outer circumferential lines have somewhat larger dimensions than the inner contour lines of the two full rims, so that the full rims of the central piece of the eyeglasses are stretched around the lenses, and their shape conforms to the shape of the lenses.

Abstract: The present invention relates to eyewear that provides replaceable and/or interchangeable lens for eyewear. The lens and frame set is adapted for the easy replacement and/or interchange of the removable lenses from a front side of the frame. In one embodiment, the lens is further secured into the frame from the front side by a resiliently compressible barrier that must be overcome in order for the lens to be received into and out of the frame. In another embodiment, the lenses are securable into the frame by friction from the front side, the friction arising between a resiliently compressible lens gasket that is attached to the periphery of the lens and an interior surface of the cross section of the bezel of eyepiece of the frame.

Abstract: Lens retention in an eyewear having a front frame having continuous rim type right and left eye openings each having a substantially L-shaped cross-section formed of any desired material. A lens having a beveled edge is placed in a respective eye opening with the apex of the bevel abutting the inner surface of the side wall of the eye opening which thereby forms an adhesive trough at the rear surface of the lens. A bead of UV-curable adhesive is applied within the trough which thereby firmly secures the lens within the eye opening.

Abstract: A pair of eyeglasses includes an elongated lens unit, a pair of connectors, and a pair of elongated bows. The lens unit has opposite end portions, each of which has an upright lateral edge formed with a positioning notch and is further formed with a positioning hole spaced apart from the upright lateral edge. Each of the connectors has a base portion, and longer and shorter clamping plates which extend from a front end of the base portion and which cooperatively form a receiving groove therebetween for receiving a respective end portion of the lens unit such that the longer clamping plate abuts against a front side face of the lens unit and such that the shorter clamping plate abuts against a rear side face of the lens unit. The receiving groove is provided with a retaining protrusion therein to engage the positioning notch in the respective end portion.

Abstract: A protective eyeglass assembly for use during sport activities comprises a pair of separate lens frames individually cooperating with a lens holder to secure a pair of lenses therebetween. A detachable nose bridge interconnects the pair of separate lens frames with the lens holder so as to form a unitary eyeglass assembly, easily dismountable for lens replacement due to lens damage or lens prescription.

Abstract: Adhesive eyeglasses comprising a frame and a one piece convex shaped lens affixed to the frame such that the lens is spaced away from the face of the wearer. The eyeglasses further comprise a replaceable adhesive strip detachably attached to the frame. The adhesive eyeglasses are secured to the face of the wearer by gently pressing the adhesive strip against the wearer's face. When desired, the adhesive eyeglasses are readily removable from the face of the wearer. Prior to subsequent use, the used adhesive strip can be removed from the frame and replaced with a unused adhesive strip.

Abstract: A pair of glasses including two outer butts, two inner butts, a bridge and two movable rim assemblies. Each outer butt has two stopper plates each being formed with a longitudinal channel in which the movable rim assembly is inserted. Each inner butt also has a longitudinal channel in which the movable rim assembly is inserted. By means of the longitudinal channels of the stopper plates of the outer butts and the longitudinal channels of the inner butts, the upper or lower rims of the movable rim assemblies can be fixed with the lenses. Therefore, the glasses can be changed between full rim pattern, upper half rim pattern, lower half rim pattern and rimless pattern.

Abstract: A mono-lens eyeglasses includes a frame, a mono-lens and two temples. The frame has a center opening respectively in two ends, and a long groove in a lower edge for an upper edge of the mono-lens to fit in. The mono-lens has a notch formed respectively in two ends for a front end of each temple to engage in or disengage from by swinging the temple. Then the mono-lens may by removed from the frame and replaced with a new one by swinging the temple with the front end disengaged from the notch of the mono-lens without need of any tools.

Abstract: An eyewear apparatus and method for attaching various eyewear frame components together to form a single front frame unit where the components are formed from different material such as metals and plastics. Right and left eye members define right and left eye openings wherein a pair of lenses are inserted. A bridge component has a central portion with four arms radially extending from the central portion. Lugs are provided at the end of at least two, but preferably all four arms of the bridge component which align with lugs provided on the eye members which extend toward the respective eye opening thereof. Securing members are passed consecutively through each lens and aligned pair of lugs on the eye members and bridge component. A pair of tabbed projections are also provided on the eye members which extend into opposite ends of a channel extending laterally through the central portion of the bridge component, thereby establishing a total of six attachment points between the bridge, eye members and lenses.

Abstract: An eyeglass protector for protecting the eyeglasses worn by a wearer which includes one-piece flexible band member made of a durable plastic having a center section and two temple sections. The lower surface of the band member rests on the upper surface of the eyeglass frame. A bendable, transparent plastic visor shield for covering both lenses of a pair of eyeglasses is detachably connected to the center section of the band member by a plurality of connecting pin members and a plurality of pin covers. The band member also includes a pair of bracing elements for retaining the band member in a curved configuration.

Abstract: Clip-on auxiliary glasses are custom fit to a user's regular eyeglasses by selecting heat-softenable rim blanks having circumferences corresponding to the circumferences of auxiliary lenses, softening them and securing the auxiliary lenses in them. A pair of spaced clips is secured in the periphery of each rim, and a spring bridge strap is cut to length and secured to each rim to produce a unit which matches the configuration of the eyeglasses with which the auxiliary glasses are to be used.

Abstract: An eyewear frame is provided having an integral frame piece with a front portion and two temple portions positioned on opposite ends of the front portion wherein the integral frame piece is a continuous metallic wire having super-elastic properties.

Abstract: The spherical flexible sheet lens is releasably secured to and within the channel of an eyewear frame. The lens defines two distinct lens elements and a bridge part spacedly integrally interconnecting the first and second lens elements. The bridge part includes a nose opening for free passage of the wearer's nose. A transverse lip forms the top of said lens to be inserted within the channel and secured to the frame. Each lens element: is of generally spherical shape; is thickest in its center portion and gradually thinner towards its edgewise portion to control the optical distortion brought about by a curved plastic lens; is adapted to register with a corresponding one of the two eyes of a wearer; defines an interior surface in facing register with the wearer's face and an exterior surface; includes an inturned web interconnecting the top and inner sides of each lens element to the lip and bridge part, respectively, the lens element being outwardly offset relative to said lip and bridge part.

Abstract: Spectacles comprising a reslient frame and lenses with cutouts along their periphery. The frame has two frame sections. Each frame section has two frame parts defining an upper frame part and a lower frame part. The upper frame part and the lower frame part are hinged together so that they can pivot relative to each other. At least one of the frame parts in each frame section has an opening to receive a lens. The lens is inserted in a space defined by the associated upper frame part and an additional frame section which extends parallel to the associated upper frame part. The additional frame section has two short bent ends received within a respective lens cutout. These short ends are joined to the associated upper frame part. Each frame part can be displaced relative to its corresponding other frame part to widen the opening defined by the both frame parts for receiving a lens.

Abstract: Spectacle frames and earstems made of composite material comprising a plurality of resin saturated wood laminates compressed into a densified form. The frames and earstems are machined from a single block of the densified wood using a CNC machine. The earstems are attached to the frames with spring hinges. The contours of the frames and earstems reveal varying laminate layers to create an attractive wood grain or color pattern.

Abstract: Eyeglasses with lenses replaceable comprising a lens frame and a plurality of pairs of lenses to be selectably used and fitted in two lens holes of the lens frame by a user with easiness without need of any tools, each lens hole and each lens having the same shape, each lens hole having a circumferential wedge-shaped ridge to engage exactly with a circumferential wedge-shaped groove of each lens, each lens hole and each lens having a wedge-shape position portion and a nearly-round fitting portion to correspond with each other so that each lens may fit in each lens hole with firm stability.

Abstract: A spectacle frame is fabricated by bending a piece of wire. The bends include eyelets or loops which are sized to accept therethrough the threaded shanks of plastic screws, but to stop the screw heads. The screws are passed through the eyelets and threaded into mating threaded holes in plastic lenses to attach the lenses onto the wire.

Abstract: The present invention relates to an eyeglass frame having a tightening portion disposed in the middle of an NT alloy loop wire 6, and the outer peripheries of a pair of right and left rims, which are disposed inwardly of the loop wire, tightened and secured in position by the tightening portion. With this arrangement, an eyeglass frame having increased strength can be obtained and a wide variety of parts can be prepared to meet the various demands of users.

Abstract: The AM signal from a microphone is converted into an inaudible, FM signal which is combined with the AM signal to form a composite signal. The composite signal is amplified and converted into sound waves by a speaker. Any sound returning to the microphone from the speaker has an FM component and the FM component is demodulated to reconstruct the original AM sound. The reconstructed AM signal is subtracted from the signal from the microphone, thereby removing the echo and cancelling feedback.