Communication apparatus capable of performing facsimile communication, control method therefor, and storage medium storing control program therefor

Patent metadata

Field	Value
Publication number	US-9542143-B2
Application number	US-201514662754-A
Country	US
Kind code	B2
Filing date	Mar 19, 2015
Priority date	Mar 28, 2014
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

A communication apparatus capable of storing a facsimile signal with high quality. A modem processing unit performs facsimile communication. A modulated digital signal storing unit stores a digital signal that is modulated by the modem processing unit in order to transmit to an opposite-side apparatus in the facsimile communication into a storage unit without converting into an analog signal. A demodulated digital signal storing unit stores a digital signal that is obtained by demodulating a signal received from the opposite-side apparatus in the facsimile communication by the modem processing unit into the storage unit.

First claim

What is claimed is:

1. A communication apparatus comprising:
a modem processing unit configured to perform facsimile communication;
a modulated digital signal storing unit configured to store into a storage unit a first pulse code modulated (PCM) digital signal that is modulated by said modem processing unit, for transmission to an opposite-side apparatus in the facsimile communication without converting the first PCM digital signal to a first analog signal;
a network interface control unit configured to transmit the stored first PCM digital signal to the opposite-side apparatus without converting the first PCM digital signal to the first analog signal; and
a demodulated digital signal storing unit configured to store into the storage unit a second digital signal that is obtained by demodulating a received second PCM digital signal received from the opposite-side apparatus in the facsimile communication by said modem processing unit,
wherein the second PCM digital signal is received from the opposite-side apparatus without conversion from a second analog signal.

2. The communication apparatus according to claim 1 , wherein the facsimile communication is performed through a PSTN,
wherein the first PCM digital signal stored by said modulated digital signal storing unit is a signal that is D/A-converted and is transmitted to the PSTN, and
wherein the second digital signal stored by said demodulated digital signal storing unit is obtained by A/D-converting the received signal,
wherein the received signal is the second analog signal received from the PSTN.

3. The communication apparatus according to claim 1 , wherein the facsimile communication with VoIP deemed voice is performed through a network,
wherein the first PCM digital signal stored by said modulated digital signal storing unit is a VoIP deemed voice signal that is transmitted to the network, and
wherein the second digital signal stored by said demodulated digital signal storing unit is a VoIP deemed voice signal received from the network.

4. The communication apparatus according to claim 1 , wherein a format of the first PCM digital signal stored by said modulated digital signal storing unit and the second digital signal stored by said demodulated digital signal storing unit is one of linear PCM, G.711 A-Law, and G.711 μ-Law.

5. A control method for a communication apparatus having a modem processing unit that performs facsimile communication, the control method comprising:
a modulated digital signal storing step of storing into a storage unit a first pulse code modulated (PCM) digital signal that is modulated by said modem processing unit, for transmission to an opposite-side apparatus in the facsimile communication without converting the first PCM digital signal to a first analog signal;
a network interface control step of transmitting the stored first PCM digital signal to the opposite-side apparatus without converting the first PCM digital signal to the first analog signal; and
a demodulated digital signal storing step of storing into the storage unit a digital signal that is obtained by demodulating a received second PCM digital signal received from the opposite-side apparatus in the facsimile communication by the modem processing unit,
wherein the second PCM digital signal is received from the opposite-side apparatus without conversion from a second analog signal.

6. A non-transitory computer-readable storage medium storing a control program causing a computer to execute a control method for a communication apparatus having a modem processing unit that performs facsimile communication, the control method comprising:
a modulated digital signal storing step of storing into a storage unit a first pulse code modulated (PCM) digital signal that is modulated by said modem processing unit, for transmission to an opposite-side apparatus in the facsimile communication without converting the first PCM digital signal to a first analog signal;
a network interface control step of transmitting the stored first PCM digital signal to the opposite-side apparatus without converting the first PCM digital signal to the first analog signal; and
a demodulated digital signal storing step of storing into the storage unit a digital signal that is obtained by demodulating a received second PCM digital signal received from the opposite-side apparatus in the facsimile communication by the modem processing unit,
wherein the second PCM digital signal is received from the opposite-side apparatus without conversion from a second analog signal.

Assignees

• Canon Kk

Inventors

• Ohara Eiji

Classifications

• G06F3/1286 Primary

  via local network · CPC title

• G06F3/1236

  Connection management · CPC title

• H04N1/32 Primary

  Circuits or arrangements for control or supervision between transmitter and receiver {or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device (H04N1/38, H04N1/387 take precedence)} · CPC title

• H04N1/33338

  adapting to particular facsimile group, e.g. G3 · CPC title

• H04N1/333

  Mode signalling or mode changing; Handshaking therefor · CPC title