Facsimile and static presentation processing – Facsimile – Facsimile measuring – testing – or calibrating
Reexamination Certificate
1999-06-22
2002-05-07
Williams, Kimberly A. (Department: 2622)
Facsimile and static presentation processing
Facsimile
Facsimile measuring, testing, or calibrating
C358S425000, C358S434000, C379S100170
Reexamination Certificate
active
06384938
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a facsimile module self-diagnostic system which is suitable for digital circuit multiplication equipment (hereinafter often referred to as DCME) and can self-diagnose the demodulation circuit and the re-modulation circuit configuring a facsimile module built in the DCME.
The conventional self-diagnostic test for DCME is particularly performed to ensure the operation of the transmission-side adaptive differential pulse code modulation (hereinafter often referred to as ADPCM) encoding circuit and the reception-side ADPCM demodulation circuit, used for a compressed transmission process of voice signals and data signals.
Regarding such self-diagnostic testing, the section 10.1 “Channel check procedure” of ITU-T Recommendation G.763 “DIGITAL CIRCUIT MULTIPLICATION EQUIPMENT USING 32 KBIT/S ADPCM AND DIGITAL SPEECH INTERPORATION” specifies the method of ensuring the operation of a transmission-side adaptive differential pulse code modulation encoding circuit and a reception-side ADPCM demodulation circuit, used for a compressed transmission process of voice signals and data signals.
FIGS. 6 and 7
illustrate the procedure disclosed in the above-mentioned prior art document.
FIG. 6
shows the configuration of the transmission-side self-diagnostic system in DCME. In the transmission circuit, a signal discrimination circuit
31
discriminates whether an input signal from the TRUNK input terminal is a data signal or a facsimile signal (hereinafter referred to a FAX signal). In response to the discriminated voice/data discrimination signal, a voice/data signal assignment control circuit
34
controls a delay circuit
32
, a test tone signal generation circuit
35
, a voice/data signal ADPCM encoding circuit
36
, a voice/data signal connection circuit
37
, and a voice/data assignment signal generation circuit
38
in an assignment mode. The delay circuit
32
delays an input signal by a period of time for discrimination and then outputs the delayed voice/data signal to the voice/data signal ADPCM encoding circuit
36
. The test tone signal generation circuit
35
generates a test tone signal at regular intervals and outputs it to the voice/data signal ADPCM encoding circuit
36
.
In the voice/data signal ADPCM encoding circuit
36
, a corresponding ADPCM encoding circuit is assigned according to ADPCM code control information from the voice/data signal assignment control circuit
34
. The corresponding ADPCM encoding circuit subjects a voice signal, a data signal or a test tone signal to an ADPCM encoding process and then outputs the encoded signal to the voice/data signal connection circuit
37
. The voice/data signal connection circuit
37
rearranges ADPCM encoded voice/data signal for multiplication and outputs the rearranged signal as a voice/data transmission signal to the multiplex circuit
43
. The voice/data assignment signal generation circuit
29
generates an assignment signal for informing the opposite side of voice/data assignment information and outputs it as the voice/data assignment signal to the multiplex circuit
43
.
In response to a discriminated FAX discrimination signal, the FAX signal assignment control circuit
39
controls the delay circuit
33
, the FAX signal demodulation circuit
40
, the FAX signal connection circuit
41
, and the FAX assignment signal generation circuit
42
in assignment mode. The delay circuit
33
delays an input signal by a period of time for discrimination and then outputs the delayed FAX signal to the FAX signal demodulation circuit
40
. In the corresponding FAX signal demodulation circuit
40
, a corresponding demodulation circuit is assigned according to demodulation control information from the FAX signal assignment control circuit
39
. The corresponding modulation circuit demodulates the FAX signal or the test FAX signal and then outputs the demodulated signal to the FAX signal connection circuit
41
. The FAX signal connection circuit
41
rearranges the demodulated FAX signal for demodulation and then outputs the rearranged signal as a FAX transmission signal to the multiplex circuit
43
. The FAX assignment signal generation circuit
42
generates as a FAX assignment signal an assignment signal for informing the opposite side of FAX assignment information, to the multiplex circuit
43
. The multiplex circuit
43
multiplexes a voice/data transmission signal, a voice/data assignment signal, a FAX transmission signal, and a FAX assignment signal and then outputs the multiplex signal as a BEARER signal to the opposite side.
FIG. 7
illustrates the configuration of a reception-side self-diagnostic system in the digital circuit. multiplication equipment. In the reception-side self-diagnostic system, the separation circuit
44
separates a voice/data transmission signal, a voice/data assignment signal, a FAX transmission signal and a FAX assignment signal from the input multiplex signal being a BEARER signal. The voice/data assignment signal reception circuit
46
analyses a separated voice/data assignment signal and then outputs a voice/data assignment analysis signal to the voice/data signal assignment control circuit
47
.
The voice/data signal assignment control circuit
47
distributively controls the voice/data signal connection circuit
45
, the voice/data signal ADPCM demodulation circuit
48
and the test tone signal judgment circuit
49
. The voice/data signal connection circuit
4
rearranges separated voice/data signals for an ADPCM demodulation process and then outputs the rearranged signal to the voice/data signal ADPCM demodulation circuit
48
. The voice/data signal ADPCM demodulation circuit
48
subjects a corresponding signal to the ADPCM demodulation process based on the ADPCM demodulation control information from the voice/data signal distribution control circuit
47
. Then, the voice/data signal ADPCM demodulation circuit
48
outputs a demodulated voice signal and a demodulated data signal to the signal connection circuit
54
and outputs a demodulated test tone signal to the test tone signal Judgment circuit
49
. The test tone signal demodulation judgment circuit
49
judges whether the ADPCM-demodulated test tone signal satisfies the recommendation and then outputs the judgement result.
The FAX assignment signal reception circuit
51
analyzes the separated FAX assignment signal and then outputs a FAX assignment analysis signal to the FAX signal separation control circuit
52
. The FAX signal separation control circuit
52
distributively controls the FAX signal distribution control circuit
50
and the FAX signal re-modulation circuit
53
. The FAX signal distribution control circuit
50
rearranges the separated FAX transmission signals for re-modulation by the re-modulator and then outputs the rearranged signal to the FAX signal re-modulation control circuit
52
. The FAX signal re-modulation circuit
53
re-modulated a Corresponding signal based on the re-modulation control information from the FAX signal re-modulation circuit
52
and outputs the re-modulates the FAX signal to the signal connection circuit
54
. The signal connection circuit
54
respectively connects a demodulated voice signal, a demodulated data signal, and a re-modulated FAX signal to respective TRUNK signal output terminals and outputs them as the TRUNK output signals.
As described above, the conventional self-diagnostic system does not have the configuration of ensuring the operation of the transmission-side demodulation circuit and the operation of the reception-side re-modulation circuit in the facsimile module used for a FAX signal compressed transmission process. Hence, the problem is that the self-diagnostic system cannot recognize a failure occurring in the transmission-side demodulation circuit and the reception-side re-modulation circuit in the facsimile module.
SUMMARY OF THE INVENTION
The present invention is made to solve the above-mentioned problems.
The objective of the invention is to provide a facsimile module self-diagnostic system that can ensure the
Scully Scott Murphy & Presser
Williams Kimberly A.
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