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Method for setting volume and/or balance controls during a hearing test

A method of testing the hearing of a user utilizing a computer system that includes a computer and a speaker. The computer can output an electrical signal to the speaker and the speaker is operable to convert the electrical signal into a stimulus. The computer system has volume controls that control the amplitude and balance between channels of the electrical signal. The method includes: downloading a computer program from a server to the computer; executing the computer program on the computer, the execution of the computer program setting a volume control; generating a stimulus; and receiving an input from the user that indicates that the user heard the stimulus.

Tracking error balance adjustment circuit and a current control circuit used for an optical disk playback apparatus, and an optical disk playback apparatus including the same

A tracking error balance adjustment circuit, and a current control circuit used for a variable gain RF amplifier automatically controlled to output a signal having a predetermined amplitude. The tracking error balance adjustment circuit comprises two separate gain adjusting circuits, each having variable attenuation circuit having first gm amplifier of variable gm type, a second gm amplifier of variable gm type connected to the variable attenuation circuit, and an output circuit connected to the second gm amplifier, comprising an operational amplifier circuit having feedback resistor, wherein the first and second gm amplifiers are differentially controlled commonly by a control current. The a current control circuit is arranged in a variable gain RF amplifier connected to a head amplifier circuit amplifying an output signal from optical pickup, controlling a current output of the variable gain RF amplifier so that it changes in accordance with different functions in the range where the control voltage input is lower than the reference potential and the range where the control voltage input is higher than the reference potential, with the result that the gain control sensitivity can be set almost equal between the two ranges.

Balance weight for a wheel of a two-wheel vehicle

A balance weight for a wheel of a two-wheel vehicle includes a weight body made from metal other than lead and a clip made from spring steel. The weight body includes a U-shaped transverse cross-section and a groove for mounting the clip therein. The weight body further includes a groove bottom wall and a pair of groove side walls connected to opposite width ends of the groove bottom wall. The clip includes a bottom portion and a pair of arms connected to opposite width ends of the bottom portion of the clip. The clip is mounted to the groove bottom wall of the weight body with the bottom portion of the clip contacting closely to the groove bottom wall of the weight body. The clip and the weight body are coupled to each other by a mechanical coupling. The coupling may be replaced by a local welding.

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Adjustable Bed
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