US 6,714,912 B2 · Digital cordless phone system for improving distance of speech communication using error concealment and method thereof

Abstract

A digital cordless phone system and a communication method for improving the distance of speech communication using error concealment are provided. The digital cordless phone system has a base unit and a remote unit, and each of the base and remote units has a first codec, a data processing unit, a controller, a modem and a switch. The first codec encodes voice data in a first encoding mode, and decodes the data encoded in the first encoding mode in a first decoding mode. The data processing unit having a second codec encodes the voice data in a second encoding mode, adds an error-detection code to encoded data to indicate existence of an error in the encoded data, removes the error-detection code from encoded data received from one of the base unit and the remote unit in the second encoding mode, performs error concealment with respect to the encoded data from which the error-detection code is removed, and provides error concealed data to the second codec to decode the error concealed data in a second decoding mode. The controller generates a selection signal for changing an encoding mode of the digital cordless phone system in response to a signal representing strength of a signal received from the base unit or the remote unit. The modem modulates data output from the first codec or the data processing unit, and demodulates data remotely received from the base unit or the remote unit. The switch connects the first codec or the data processing unit to the modem in response to the selection signal.

Claims18

Dependent claims

A digital cordless phone system having a base unit and a remote unit, wherein each of the base unit and the remote unit comprising:

a first codec for encoding voice data in a first encoding mode and decoding data encoded in the first encoding mode in a first decoding mode;
a data processing unit having a second codec for encoding the voice data in a second encoding mode, the data processing unit for adding an error-detection code to encoded data to indicate existence of an error in the encoded data, removing the error-detection code from encoded data received from one of the base unit and the remote unit, performing error concealment with respect to the encoded data from which the error-detection code is removed, and providing error concealed data to the second codec to decode the error concealed data in a second decoding mode;
a controller for generating a selection signal for changing an encoding mode of the digital cordless phone system in response to a signal representing strength of a signal received from the base unit or the remote unit;
a modem for modulating data output from the first codec or the data processing unit, and demodulating data remotely received from the base unit or the remote unit;
and
a switch for connecting the first codec or the data processing unit to the modem in response to the selection signal.

3 more elements

A voice communication method between a base unit and a remote unit in a digital cordless phone system, the method comprising the steps of:

(a) determining whether a current speech communication distance between the base unit and the remote unit is beyond a preset distance of speech communication;
(b) if it is determined that the current speech communication distance is within the preset distance of speech communication, encoding voice data in a first encoding mode and decoding receiving data in a first decoding mode corresponding to the first encoding mode to restore the voice data;
and
(c) if it is determined in step (a) that the current speech communication distance is beyond the preset distance of speech communication, encoding the voice data in a second encoding mode, adding an error-detection code to encoded data, removing the error-detection code from receiving data, and decoding the receiving data from which the error-detection code is removed in a second decoding mode corresponding to the second encoding mode to restore the voice data.

1 more element

A program storage device readable by a machine, tangibly embodying a program of instructions executable by the machine to perform method steps for managing a plurality of data points in a multi-dimensional space, the method comprising the steps of:

performing communication in a first codes mode between a base unit and a remote unit of a digital cordless phone system;
detecting if a current communication distance between the base and remote units is beyond a preset communication distance;
generating a first information to change a coding-decoding mode of the digital cordless phone system from the first codec mode to a second codec mode, when the current communication distance is beyond the preset communication distance;
and
performing the communication in the second codec mode between the base and remote units upon receiving the first information.

2 more elements

Dependencies are inferred from the claim text.

Digital cordless phone system for improving distance of speech communication using error concealment and method thereof

Life of this patent

Digital cordless phone system for improving distance of speech communication using error concealment and method thereof

Life of this patent

Abstract

Claims18