Abstract: A pair of eyeglasses includes a pair of temples, a pair of hinges each having an end pivotally connected with a respective one of the temples and another end formed with a first recess, a rim composed of an upper portion and a lower portion and having two opposite sides provided with two projections each configured to be fitted into the recess, a bridge having two ends each formed with a second recess configured to receive a respective one of the projections, and a pair of nose pads connected with the projections, whereby the eyeglasses can be easily assembled and disassembled thereby decrease the manufacturing cost and facilitating maintenance and replacement of component parts.

Abstract: An eyeglass frame that allows the lenses to be changed including a front and temples, the front including two rims, a nose engagement seat between the rims, two side retaining seats disposed at both sides of the front respectively, and a slide block for coupling to the nose engagement seat. The nose engagement seat has an outwardly projecting block on its outer surface. The slide block is formed with a grove shaped to match the projecting block such that it may slid over the projecting block to be coupled thereto and cover parts of the rims. The side retain seats are formed with curved grooves for the lenses. The projecting block of the nose engagement seat and the groove of the slide block are interchangeable. Besides, the nose engagement seat may be replaced by a securing seat having retaining grooves at both lateral sides thereof, and two side slide blocks are provided near both ends of the front respectively.

Abstract: Sound is processed for therein enhancing wanted sound with respect to unwanted sound. The sound is distributed over a plurality of parallel pass bands. In each channel, possibly with excepting the lowest frequency channels, the envelope of the respective signals in that frequency band is detected. Next, the envelope, or in the lowest frequency channels, the signal itself is preferentially filtered for enhancing signals at the fundamental frequency of the wanted sound. Subsequently, as far as applicable, the signal filtered is modulated with the envelope found for the channel in question and all channel outputs are summed.

Abstract: A pair of spectacles having a lightweight frame structure especially designed with unusual pantoscopic tilt in combination with rocking-pad nasal support affording minimal facial contact and cable temple ends adapted to intimately engage and extend about a large portion of the ear for sureness of continued proper fit of the spectacles upon the face during pursuance of the sport of tennis.