JPH05219334A - Facsimile equipment - Google Patents

Abstract

PURPOSE:To save the communication cost and the communication time by reducing pre-procedure processing. CONSTITUTION:After a call is established, a CED signal is sent from a called station, and a caller station receiving the CED signal sends a QTN signal (a non-standard NSF signal). When receiving this signal the called station sends out an SNSF signal (a non-standard NSF signal). A picture information parameter is sent at a high speed from the caller station and then the picture information is sent succeedingly. The QTN signal signifies the reduction of a pre- protocol processing and its frequency represents a transmission speed of the picture information. Thus, a TSI signal (including transmission speed of picture information) and a DCS signal or the like sent by the usual communication procedure are saved. Moreover, an SNSF signal is a signal omitting items of the standard NSF signal. Thus, all or part of each control signal having been implemented in the usual pre-protocol processing are omitted to reduce considerably the time required for the pre-protocol processing.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facsimile apparatus capable of shortening the time of pre-procedure processing performed before transmitting / receiving image information.

[0002]

BACKGROUND OF THE INVENTION As a facsimile machine, a G3 machine is widely used at present. This G3 machine uses the analog telephone line network to transmit an A4 size manuscript in one minute by CCITT.
(International Telegraph and Telephone Advisory Committee).

In such a G3 group facsimile apparatus, image information is transmitted and received by a communication procedure as shown in FIG. That is, after the transmission side of image information dials to establish a call, the called station (reception side) sends out a CED signal (called station identification signal), followed by an NSF signal (non-standard signal) and a CSI signal (received side). A call station identification signal) and a DIS signal (digital identification signal) are transmitted.

In response to this, the TSI signal (transmitting station identification signal), DCS signal (digital command signal), T
A CF signal (training check signal) is transmitted, and then a CFR signal (reception preparation confirmation signal) is transmitted from the called station. Through the above-described pre-procedure processing, the capabilities of the calling station and the called station are mutually confirmed, and then the calling station transmits image information.

[0005]

SUMMARY OF THE INVENTION In the above-mentioned facsimile machine, it is necessary to ensure that the other party can receive the control signal without fail.
The control signal is sent at a transmission rate of about 00 bps,
It usually takes about 12 seconds for the pre-procedure processing. Therefore, when the image information is transmitted to a distant party, not only the communication cost becomes high, but also the facsimile device is occupied for a long time, so that it cannot be received from others during that time, and the efficiency of use is deteriorated. there were.

Therefore, the present invention proposes a facsimile apparatus which solves the above-mentioned problems and can reduce the time required for the pre-procedure processing.

[0007]

In order to solve the above-mentioned problems, in the first invention, a CED signal is transmitted in a pre-procedure process for receiving image information after establishment of a called station. It is characterized in that when a non-standard tone signal is received from the other side, the transmission of the CED signal is stopped and the mode is shifted to a predetermined shortening procedure mode.

In the second aspect of the invention, when the CED signal is received in the pre-procedure processing for transmitting the image information after the establishment of the calling station, a non-standard tone signal is transmitted and a predetermined signal is transmitted. Notifying the called station that it will shift to the shortened procedure mode, and also notifying the called station side of the transmission rate of the image information set corresponding to this frequency by setting the tone signal frequency to a predetermined frequency. It is characterized by doing so.

In the second aspect of the invention, after transmitting the non-standard tone signal, the non-standard NSF signal is transmitted, and
It is also possible to transmit image information after transmitting image information parameters such as resolution, encoding method, and document width at high speed.

[0010]

In FIG. 2, after the call is established, the called station sends the CE.
The D signal is transmitted, and in response to this, the QTN signal (non-standard tone signal) is transmitted from the calling station. Upon receiving this, the called station sends out an SNSF signal (non-standard NSF signal). Thereafter, the calling station sends the image information parameter at a high speed, and then the image information is sent.

The QTN signal means that the pre-procedure processing is shortened, and four kinds of frequencies are set here as shown in FIG. 3B, and each frequency represents a transmission rate of image information. .. This makes it possible to omit the TSI signal and the DCS signal (including the transmission rate of image information, etc.) transmitted in the normal communication procedure.

Further, as shown in FIG. 4A, the SNSF signal is a shortened version of the standard NSF signal (FIG. 4B) in which non-standard essential capabilities are omitted.
Of the items omitted here, the image information parameters are separately transmitted at high speed. This reduces processing time.

By omitting all or a part of each control signal which is used in the normal pre-procedure processing in the calling station and the called station, the time required for the pre-procedure processing can be greatly shortened. Become.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a facsimile apparatus according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows the structure of a facsimile apparatus according to the present invention. In the figure, 11 is a C for managing transmission / reception control.
PU, 12 are ROMs in which various control programs such as transmission / reception programs are stored, and 13 is RAM in which image information to be transmitted is stored.

The image information read by the image reading unit 14 is stored in the RAM 13 via the interface 15 or is directly supplied to the modem and the network control circuit (NCU) 16 functioning as a transmitting / receiving means. In addition, the image information input from the communication line is
The data is stored in the RAM 13 via 16 or is directly supplied to the recording unit 18 functioning as a printer via the interface 17 to record its contents.

The telephone number of the transmission destination is displayed by being supplied to the display unit 20 via the interface 19. The operation unit 21 is provided with a plurality of keys (not shown), and when these keys are operated, the contents thereof are taken into the CPU 11 via the interface 22.

This facsimile apparatus has a tone receiver 23 capable of detecting dual tone and single tone.
Is equipped with. The tone receiver 23 can recognize the frequency of the received tone. The contents recognized here are sent to the CPU 11.

Next, the communication procedure of this facsimile will be described with reference to FIG. In this facsimile apparatus, when a call is established, the called station first sends a CED signal. In response to this, a quick tone signal (hereinafter referred to as a QTN signal) preset by the calling station and the called station is transmitted. This QTN signal indicates that the standard pre-procedure processing is performed in a shortened manner, and the frequency thereof represents the transmission rate of image information.

That is, the frequency of the QTN signal is shown in FIG.
As shown in (a), A in the push button dial signal
The signals are set in the same manner as the four types up to the D signal, and each frequency indicates a specific transmission rate as shown in FIG. For example, when the frequency of the QTN signal is the same as that of the A signal, the image information is transmitted at 14.4 Kbps, and when the frequency is the same as that of the B signal, the image information is transmitted at 9.6 Kbps.

When the called station receives the QTN signal, it stops sending the CED signal and then omits a part of the standard NSF signal to shorten the non-standard NSF signal (hereinafter referred to as SN
(SF signal). This SNSF signal is shown in FIG.
As shown in (a), the non-standard essential capability item in the standard NSF signal is partially omitted.

That is, the frame of the standard NSF signal is
Address field A, control field C, facsimile control field F, country information, manufacturer code M, parameter I as shown in FIG.
DPI, length of non-standard essential ability LI, non-standard essential ability,
It is composed of a check code CRC and a flag sequence FLG. And this NSF signal is 28 (= 6 +) in total.
18 + 4) bytes, and the transmission rate is 300bp
Since it is s, the transmission time T1 is T1 = (28 bytes × 8
(Bit) / 300 bps = 0.75 s.

The SNSF signal is obtained by omitting predetermined items from the non-standard essential capabilities of the NSF signal, and has 15 bytes as shown in FIG. Since this SNSF signal is transmitted at 300 bps, its transmission time T2
Is T2 = (15 bytes × 8 bits) / 300 bps =
It is 0.4 s, which is about half that of the conventional one. This S
The NSF signal is retransmitted, for example, three times until the later-described image information parameter sent from the calling station is received. This makes the communication procedure resistant to noise.

The called station sends an SNSF signal and
The frequency of the received QTN signal is detected to predict the transmission rate of image information, and the modem and NCU 16 are set up accordingly. When the calling station receives the SNSF signal, it sends the image information parameter, that is, the horizontal resolution, the encoding method, the document length, etc. omitted in the above-mentioned non-standard essential capability at the same high speed as the transmission speed of the image information, Then, the image information is transmitted.

By performing the pre-procedure processing in such a communication procedure, the processing time is about 1.8 as shown in FIG.
It can be shortened to 5s. That is, CED signal and QTN
1s for signal transmission / reception, 0.3 for preamble P transmission / reception
s, 0.4 s for transmitting and receiving the SNSF signal, and 0.15 (0.075 × 2) s for each signal interval, which is 1.85 s in total.

Further, in this communication procedure, when the QTN signal is not reliably recognized by the called station due to noise on the communication line, the standard NSF signal, C
SI signal, DIS signal, and TCF signal are transmitted. Then, when the calling station receives the NSF signal, it shifts to a normal communication procedure and the calling station sends out the TSI signal and the DCS signal. In response to this, the CFR signal is transmitted from the called station, and then the image information is transmitted from the calling station. Thus, even when the called station does not confirm that the communication station is in a bad state and that the shortening procedure is performed, the pre-procedure processing is performed at a normal speed, whereby image information is transmitted and received.

[0027]

As described above, according to the present invention, the non-standard tone signal transmitted from the calling station and the non-standard NSF signal obtained by shortening the NSF signal transmitted from the called station are transmitted and received. The pre-procedure process can be greatly shortened.

Therefore, according to the present invention, the communication cost can be reduced, and the efficiency of use of the facsimile device can be improved.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a facsimile apparatus according to the present invention.

FIG. 2 is an explanatory diagram illustrating an example of a communication procedure.

FIG. 3 is an explanatory diagram illustrating a QTN signal.

FIG. 4 is an explanatory diagram illustrating an SNSF signal and an NSF signal.

FIG. 5 is an explanatory diagram illustrating a standard communication procedure.

[Explanation of symbols]

 11 CPU 12 ROM 13 RAM 14 Image reading unit 16 Modem and NCU 18 Recording unit 20 Display unit 21 Operation unit 23 Tone receiver

Claims (3)

[Claims] 1. The CED signal when a non-standard tone signal is received from the other party during transmission of the CED signal in the pre-procedure processing for receiving the image information after the establishment of the called station. A facsimile machine characterized in that the sending of the data is stopped and a predetermined shortened procedure mode is entered. 2. In a pre-procedure process for transmitting image information after establishment of a calling station, a non-standard tone signal is transmitted when a CED signal is received, and a predetermined shortened procedure mode is entered. To the called station side, and by setting the frequency of the tone signal to a predetermined frequency, the transmission speed of the image information set corresponding to this frequency is transmitted to the called station side. A facsimile machine characterized by the above. 3. After transmitting the non-standard tone signal, a non-standard NSF signal is transmitted, and at the same time, image information parameters such as resolution, encoding method, document width, etc. are transmitted at a high speed, and then the image information is transmitted. The facsimile apparatus according to claim 2, wherein the facsimile apparatus is configured to do so.