The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 07, 1989
Filed:
Oct. 26, 1987
Victor Company of Japan Ltd., Yokohama, JP;
Abstract
A first digital sound data of N-bits delivered from the input terminal is controlled by a mute control signal indicating either on-mute state signifying the state where mute operation is conducted or off-mute state signifying the state where no mute operation is conducted. This circuit includes a level control circuit, a register, a bit shift circuit, and a data selector. The level control circuit outputs a second digital sound data corresponding to the soundless state at the time of on-mute. It outputs data of which level gradually rises from the level of the soundless state to the level indicated by the first digital sound data at the beginning of off-mute and outputs the first digital duration at times subsequent thereto. Thus, for a duration at the beginning of off-mute, sound volume gradually rises. The register and the bit shift circuit gradually attenuate the first digital sound data to the level of the soundless state. Thus, for a duration at the beginning of on-mute, sound volume gradually lowers. The data selector selects the lowering operation by the time the above-mentioned rising operation is conducted, thus permitting a normal mute operation.