Digital communication device

Claim 2

A modulation device for outputting digital data representing a modulated signal to a digital transmission path, said modulation device comprising: first conversion means for performing a modulation process by converting input signals into first digital signals representing the modulated signal and outputting said first digital signals at first intervals, said first intervals being predetermined for performing the modulation process; and second conversion means for converting said first digital signals, input at said first intervals, into second digital signals representing the modulated signal at second intervals which are different from said first intervals and which correspond to a sampling frequency of the digital transmission path, and outputting said second digital signals at said second intervals to the digital transmission path.

Claim 3

A modulation device according to claim 1, wherein said first conversion means sequentially converts said input signals input at the first intervals into said first digital signals.

Claim 4

A modulation device according to claim 1, wherein said second conversion means converts said first digital signals input at said first intervals into said second digital signals at said second intervals by interpolation.

Claim 5

A modulation device according to claim 1, wherein said second intervals are equal to intervals between sampling clocks of said digital transmission path.

Claim 6

A modulation device according to claim 1, wherein said first intervals are shorter than said second intervals.

Claim 7

A demodulation device for demodulating data representing a modulated signal received from a digital transmission path and decoded by a decoding circuit, said demodulation device comprising: conversion means for converting the data representing the modulated signal input at first intervals from the digital transmission path into converted data representing the modulated signal at second intervals different from said first intervals, said first intervals corresponding to a sampling frequency of the digital transmission path; and processing means for performing demodulation based on said converted data at said second intervals.

Claim 8

A demodulation device for demodulating data representing a modulated signal received from a digital transmission path and decoded by a decoding circuit, said demodulation device comprising: conversion means for converting the data representing the modulated signal input at first intervals from the digital transmission path into converted data representing the modulated signal at second intervals different from said first intervals, said first intervals corresponding to a sampling frequency of the digital transmission path; and processing means for performing demodulation based on said converted data at said second intervals.

Claim 9

A demodulation device according to claim 6, wherein said first intervals are equal to intervals between sampling clocks of said decoding circuit.

Claim 10

A demodulation device according to claim 6, wherein said conversion means converts said decoded data input at said first intervals into said converted data at said second intervals by interpolation.

Claim 11

A demodulation device according to claim 6, wherein said second intervals are shorter than said first intervals.

Claim 12

A digital communication device connected to a digital network for performing modem and voice code processing, comprising: a transmitting section comprising: modulation means for outputting first signals representing a first modulated signal using a modulation process; first conversion means for converting the first digital signals inputted at a first frequency, which is predetermined for the modulation process used by the modulation means, to second digital signals representing the modulated signal sampled at a sampling frequency of the digital network; coding means for coding the second digital signals converted by said first conversion means; and means for outputting the coded second digital signals to the digital network; and a receiving section comprising: means for receiving, from the digital network, coded third digital signals representing a second modulated signal; decoding means for decoding the coded third digital signals; second conversion means for converting the third digital signals representing the second modulated signal decoded by said decoding means at the sampling frequency of the digital network into fourth digital signals representing the second modulated signal at the first frequency; and demodulation means for demodulating the fourth digital signals converted by said second conversion means.

Claim 13

A digital communication device connected to a digital network for performing modem and voice code processing, comprising: a transmitting section comprising: modulation means for outputting first signals representing a first modulated signal using a modulation process; first conversion means for converting the first digital signals inputted at a first frequency, which is predetermined for the modulation process used by the modulation means, to second digital signals representing the modulated signal sampled at a sampling frequency of the digital network; coding means for coding the second digital signals converted by said first conversion means; and means for outputting the coded second digital signals to the digital network; and a receiving section comprising: means for receiving, from the digital network, coded third digital signals representing a second modulated signal; decoding means for decoding the coded third digital signals; second conversion means for converting the third digital signals representing the second modulated signal decoded by said decoding means at the sampling frequency of the digital network into fourth digital signals representing the second modulated signal at the first frequency; and demodulation means for demodulating the fourth digital signals converted by said second conversion means.

Claim 14

A digital communication device according to claim 10, wherein said first conversion means outputs the first digital signals, which have been input from said modulation means in each of a first sampling clock, in each of a second sampling clock.

Claim 15

A digital communication device according to claim 10, wherein said second conversion means outputs the fourth digital signals, which have been input from said decoding means in each of a second sampling clock, in each of a first sampling clock.

Claim 16

A modulation device according to claim 1, wherein the second intervals are intervals sampling at a sampling clock of 8.0 KHz.

Claim 17

A modulation device according to claim 13, wherein the first intervals are intervals sampling at a sampling clock of 9.6 KHz.

Claim 18

A demodulation according to claim 6, wherein the first intervals are intervals sampling at a sampling clock of 8.0 KHz.

Claim 19

A demodulation according to claim 15, wherein the second intervals are intervals sampling at a sampling clock of 9.6 KHz.

Claim 20

A communication apparatus for communicating digital data representing a modulated signal via a digital transmission path, said apparatus comprising: procedure means for performing a communication control procedure; first conversion means for converting a communication control procedure signal into first digital signals and outputting said first digital signals at first intervals, said first digital signals representing a modulated signal modulated by a modulation process in accordance with the communication control procedure signal, and said first intervals being predetermined for the modulation process; and second conversion means for converting said first digital signals, input at said first intervals, into second digital signals representing the modulated signal at second intervals which are different from said first intervals and which correspond to a sampling frequency of the digital transmission path, and outputting said second digital signals at said second intervals to the digital transmission path.

Claim 21

A communication apparatus for communicating digital data representing a modulated signal via a digital transmission path, said apparatus comprising: procedure means for performing a communication control procedure; first conversion means for converting a communication control procedure signal into first digital signals and outputting said first digital signals at first intervals, said first digital signals representing a modulated signal modulated by a modulation process in accordance with the communication control procedure signal, and said first intervals being predetermined for the modulation process; and second conversion means for converting said first digital signals, input at said first intervals, into second digital signals representing the modulated signal at second intervals which are different from said first intervals and which correspond to a sampling frequency of the digital transmission path, and outputting said second digital signals at said second intervals to the digital transmission path.

Claim 22

An apparatus according to claim 17, wherein said first conversion means sequentially converts said communication control procedure signal input at the first intervals into said first digital signals.

Claim 23

An apparatus according to claim 17, wherein said second conversion means converts said first digital signals input at said first intervals into said second digital signals at said second intervals by interpolation.

Claim 24

An apparatus according to claim 17, wherein said second intervals are equal to intervals between sampling clocks of said digital transmission path.

Claim 25

An apparatus according to claim 17, wherein said first intervals are shorter than said second intervals.

Claim 28

A method according to claim 22, wherein the first digital signals are reproduced sequentially at the first intervals at the producing step.

Claim 29

A method according to claim 22, wherein the first digital signals are interpolated at the second intervals at the converting step.

Claim 30

A method according to claim 22, wherein the second intervals are intervals sampling at a sampling clock of 8.0 KHz.

Claim 31

A method according to claim 25, wherein the first intervals are intervals sampling at a sampling clock of 9.6 KHz.

Claim 32

A method according to claim 26, wherein five of the second digital signals are converted from six of the first digital signals.

Claim 33

A demodulating method for demodulating reception signals from a digital transmission path, said method comprising the steps of: inputting digital reception signals from the digital transmission path at first intervals which correspond to a sampling frequency of the digital transmission path; converting the digital reception signals into converted digital signals which have values of an envelope represented by the digital reception signals sampled at second intervals different from the first intervals; and demodulating the converted digital signals.

Claim 34

A demodulating method for demodulating reception signals from a digital transmission path, said method comprising the steps of: inputting digital reception signals from the digital transmission path at first intervals which correspond to a sampling frequency of the digital transmission path; converting the digital reception signals into converted digital signals which have values of an envelope represented by the digital reception signals sampled at second intervals different from the first intervals; and demodulating the converted digital signals.

Claim 35

A demodulating method according to claim 28, wherein symbol data is obtained at the demodulating step.

Claim 36

A demodulating method according to claim 28, wherein the digital reception signals are interpolated at the second intervals at the converting step.

Claim 37

A demodulating method according to claim 28, wherein the first intervals are intervals sampling at a sampling clock of 8.0 KHz.

Claim 38

A demodulating method according to claim 28, wherein the second intervals are intervals sampling at a sampling clock of 9.6 KHz.

Claim 39

A demodulating method according to claim 28, wherein six of the converted digital signals are converted from five of the digital reception signals at the converting step.

Claim 40

A demodulating method for demodulating reception signals from a digital transmission path, said method comprising the steps of: inputting, from the digital transmission path, digital reception signals representing a modulated signal at first intervals which correspond to a sampling frequency of the digital transmission path; interpolating the digital reception signals at second intervals different from the first intervals such that the interpolated digital reception signals represent the modulated signal; and demodulating the interpolated digital reception signals.

Claim 41

A demodulating method for demodulating reception signals from a digital transmission path, said method comprising the steps of: inputting, from the digital transmission path, digital reception signals representing a modulated signal at first intervals which correspond to a sampling frequency of the digital transmission path; interpolating the digital reception signals at second intervals different from the first intervals such that the interpolated digital reception signals represent the modulated signal; and demodulating the interpolated digital reception signals.

Claim 42

A demodulating method according to claim 34, wherein symbol data is obtained at the demodulating step.

Claim 43

A demodulating method according to claim 34, wherein the first intervals are intervals sampling at a sampling clock of 8.0 KHz.

Claim 44

A demodulating method according to claim 36, wherein the second intervals are intervals sampling at a sampling clock of 9.6 KHz.

Claim 45

A demodulating method according to claim 34, wherein five of the digital reception signals are interpolated into six.