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US 6,473,497 B1Granted
Digital telephone set
AssigneeNEC Infrontia Corporation
InventorMakoto Kondo
Life of this patent
Estimating the term…
Abstract
An aural information is expanded correspondingly to a compression system and a compression rate when a receiving signal from a digital telephone circuit is the aural information and a control signal received from the digital telephone circuit indicates that the aural information is compressed. When the control information indicates a stereo system including a right voice system and a left voice system, right and left voices are separated and output. Thus, a stereo communication is realized with an improved tone quality with using a digital telephone set.
Claims8
A digital telephone set comprising;
- a digital signal transmitter/receiver for receiving a digital signal with respect to a digital telephone circuit;
- a protocol control portion for transmitting receiving various control signals through said digital signal transmitter/receiver and said digital telephone circuit and converting an information contained in the digital signal into a series of information by determining the kind of information in the directivity of the digital signal correspondingly to a protocol of the digital signal;
- a receiving system recognizing portion for recognizing a communication system which sends the digital signal when said protocol control portion performs said converting and said digital signal includes aural information;
- a receiving aural signal processing means for processing the aural information according to the communication system recognized by said receiving system recognizing portion;
- and
- acoustic output means for converting the aural information processed by said receiving aural signal processing means into an analog aural information and supplying the analog aural information as an acoustic signal, wherein
- said receiving aural signal processing means includes a compressed aural information expanding portion for expanding the aural information correspondingly to a compression system and a compression rate according to said recognized communication system obtained by said receiving system recognizing portion that the aural information is compressed and a stereo separation portion for separating the aural information to a right and left aural information, and
- said acoustic output means includes means for outputting a stereo aural information according to said right and left aural information.
5 more elements
A digital telephone set comprising:
- acoustic input means for converting an aural information into digital aural information with directivity corresponding to respective right and left channels;
- a communication system set up portion for preliminarily setting up a compression system and a stereo system as the communication system for transmitting the aural in formation output from said acoustic input means to a digital telephone circuit;
- a transmitting aural signal processor for processing the digital aural information from said acoustic input means correspondingly to the compression system and the stereo system;
- a communication system notifying portion for incorporating a communication system information indicative of a compression rate and a stereo feature of the digital aural information output from said transmitting aural signal processor in a protocol control information;
- a protocol control portion for converting the digital aural information processed by said transmitting aural signal processor such that the digital aural information becomes compatible with a protocol of said digital telephone circuit and for transmitting/receiving various control information including the protocol control information;
- and
- a digital signal transmitter/receiver for transmitting the digital aural informa converted by said protocol control portion to said digital telephone circuit and transmitting/receiving various control information between said protocol control portion and said digital telephone circuit.
4 more elements
Dependencies are inferred from the claim text.