JP2006101247A - Type determination processing method and device of communication signal - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the generation of erroneous detection and improve reliability of facsimile and data communication in consideration of a failure in communication in a conventional case, in which three kinds of signals, such as a tonal signal, a digital demodulation signal and a voice signal, are treated, transmitted and received in a demodulation unit as an element at facsimile or data communication, each optimum process for each kind of signals is required in the demodulation unit, and the detection performance of each signal and erroneous detection removing performance depend on the performance of the demodulation unit as one element, thus the signal is sometimes detected erroneously as another signal depending on its contents. <P>SOLUTION: In each procedure during communication, the detection is carried out by switching to a sound dedicated digital signal processing unit 19 suitable for the type of the used signal through a switching unit 15. Then, the demodulation unit 12 does not erroneously operate by voice uttered by an audio response device or an operator. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a communication signal type determination processing method and apparatus in a facsimile or data communication composite apparatus in which voice may be mixed. Specifically, a novel communication signal type determination processing method that prevents malfunctions and improves communication reliability by accurately detecting and optimally processing various signals used in a facsimile apparatus or a data communication apparatus. And provide equipment.

  A facsimile machine, a data communication device, and a telephone may be installed and used as separate single-function devices, but are often used as multifunction devices. A facsimile apparatus uses a tonal signal, a data communication apparatus uses a digital modulation signal, and a telephone uses an audio signal. Therefore, it is necessary to accurately determine which of the three types of signals (the tonal signal, the digital modulation signal, and the audio signal) the current signal from the partner apparatus is. While using a voice signal on a telephone, there is voice guidance from the other device. For example, in response to the message “If you want A, press dial 1 and if you want B, press dial 2”, in response, press dial 1 In this communication, voice and dial sound are mixed.

    FIG. 7 is a circuit configuration diagram showing an example of a conventional device. The telephone (communication) line 1 is connected to the line control unit 11. The line control unit 11 is connected to the modem unit 12 by signals 3 and 5. A digital signal 9 is connected to the modem unit 12. Signal 3 is a digital modulation signal sent from the telephone line 1 side via the line control unit 11, and signal 5 is a digital modulation signal sent to the telephone line 1 side via the line control unit 11. The digital signal 9 is, for example, facsimile image data or an audio signal. The modem unit 12 demodulates the digital modulation signal received by the signal 3 to output a digital signal 9, digitally modulates the digital signal 9, and sends it as a signal 5.

  8, 9 and 10 show an example of the flow of operation when communication is performed using two conventional devices shown in FIG. The conventional apparatuses P and Q have started operation, are connected via the telephone line 1, and are about to start transmission of a facsimile (FAX) from the conventional apparatus P to the conventional apparatus Q (S51, FIG. 8). When dialing from the conventional apparatus P (S52), it is connected to the conventional apparatus Q via the telephone line 1, and the conventional apparatus Q confirms the incoming call in the line control unit 11 (S53Y). Therefore, the conventional device Q sends, for example, a response voice “Since it is being called, please wait for a while” to the conventional device P (S54), and the conventional device P receives this (S55). Subsequently, the conventional device Q generates a ringing tone (ringing tone) and simultaneously transmits a ringing tone notifying the conventional device P that the calling is in progress (S56). The conventional device P receives this ringing tone, and the conventional device Q side knows that it is calling (S57).

  In the conventional apparatus Q, when the handset is taken (off-hooked) (S58Y, FIG. 9), a telephone call is started (S59). If the handset is not picked up (still on hook) (S58N), it waits for reception of a CNG signal from the conventional device P (S60). The CNG signal is a signal for informing the facsimile receiver (in this case, the conventional apparatus Q) from the facsimile sender (in this case, the conventional apparatus P) that "the facsimile transmission is ready". is there. Therefore, when the conventional apparatus Q receives the CNG signal from the conventional apparatus P, it can be understood that the conventional apparatus P is trying to transmit a facsimile (not a voice signal). If the conventional apparatus Q does not receive the CNG signal for a predetermined period, it returns to step S56 (S60N).

When a CNG signal is received from the conventional apparatus P (S60Y), the conventional apparatus Q sends a CED that is a tonal signal or a DIS signal that is a digital modulation signal to the conventional apparatus P (S61). Conventional apparatus P is left not receive this CED or DIS signal (S62N), until a predetermined period of time T ₁ is elapsed (S63N), waits for detection of the CED (or DIS) signal (S64N), the CNG signal The data is sent to the conventional apparatus Q and the process returns to step S62 (S65). When a predetermined time period T ₁ is had elapsed in the step S63 to disconnect the (S63Y), the telephone (communication) line (S66). If CED is detected in step S64, the process returns to step S62 (S64Y).

  Here, the CNG signal and the CED signal will be described. The CNG signal is a calling tone and indicates that the calling terminal is a non-voice terminal. 1100Hz, 0.5 second continuous, 3 second interval audio signal (tornal signal). The CED signal is a kind of tonal signal and is a called station identification signal (2100 Hz, 2.6-second voice signal). After a non-called station responds to an incoming call, it transmits a CED signal and then transmits a signal to be transmitted. to go into. It is sent from the side that received the CNG signal (in this case, the conventional apparatus Q) to the side that transmitted the CNG signal (in this case, the conventional apparatus P). The sender of the CNG signal and the CED signal indicates that the terminal has a modem, not a voice terminal. The tone signal of the CNG signal and the CED signal may be detected and used to switch between a voice terminal and a modem terminal such as a facsimile (FAX).

 If the conventional device P receives the CED or DIS signal in step S62Y (S62Y), if the signal received from the conventional device Q is not a DIS signal or DTC signal (S67N, FIG. 10), telephone (communication) The line is disconnected (S68). If it is confirmed that the signal received from the conventional apparatus Q is a DIS signal or a DTC signal (S67Y), the conventional apparatus P is ready to receive a facsimile, so the conventional apparatus P transmits a facsimile (FAX). Then, the operation ends (S69). The conventional apparatus Q ends the operation when the facsimile (FAX) reception is completed (S70).

  Here, the DTC signal will be described. The DTC signal is a digital command response to the standard function identified by the DIS signal, and is a digital transmission command transmitted from the calling terminal desiring to become a receiver to the called terminal having the transmission function. . In facsimile (FAX) transmission / reception, the transmission side must transmit in accordance with the reception side's capabilities (communication speed, document size, resolution, etc.), so the reception side transmits a DIS signal to the transmission side after an incoming call. To inform their abilities. On the other hand, when the incoming side is switched to the transmitting side (so-called porlink function) and used, the receiving side changes the direction of transmission and reception by transmitting a DTC signal instead of the DIS signal, and the facsimile side. (FAX) The receiving capability is notified to the transmission side.

  Since the operations from the steps S55 to S67 in the operation of the conventional device P and the operations from the steps S58 to S61 in the operation of the conventional device Q process tonal signals, digital modulation signals or audio signals, Unless these three types of signals are accurately determined and signals other than the target signal are excluded, the desired operation does not proceed. An example is shown below.

  For example, if the conventional device P misidentifies the ringing tone from the conventional device Q as a CED signal in step S57 (FIG. 8), the conventional device P determines that it has received the CED signal in step S62Y (FIG. 9). In step S65, the CNG signal is not transmitted, and the DIS signal from the conventional apparatus Q is awaited (S67, FIG. 10). However, since the conventional apparatus Q does not receive the CNG signal from the conventional apparatus P, the line is disconnected (S66, FIG. 9) at the time-out (S63, FIG. 9), and the facsimile communication is not established.

  The determination of the type of communication signal depends on the modulation / demodulation unit 12 which is one element. Since the modulation / demodulation unit 12, which is one element, is designed with emphasis on digital modulation / demodulation signals, detection conditions for tonal signals and audio signals are simplified. For example, the detection condition of the CED signal included in the tonal signal is a frequency of 2100 Hz ± 35 Hz and a detection time of 10 ms. When a signal with a frequency of 2100 Hz ± 35 Hz is present in a voice signal for a short time of 10 ms, the voice signal is erroneously determined as a CED signal used in facsimile communication, and malfunctions cause facsimile communication. Will not be able to.

  Thus, if there is a voice signal that satisfies this detection condition, the voice signal will be mistaken for a CED signal. Therefore, if there is a portion that satisfies the tonal signal detection condition even in a part of the audio signal being received, the audio signal is erroneously detected as a tonal signal, and thus malfunction occurs. On the other hand, digital signal processing elements (DSP) designed exclusively for audio are available on the market, but they have excellent tonal signal and audio signal detection capabilities, but do not have a digital modulation / demodulation function. It could not be used as part 12. This DSP element has a long tonal signal detection time of 360 ms, and monitors the change in power during that period to discriminate between the audio signal and the tonal signal. ing.

  Patent Document 1 discloses a method for encoding and decoding a facsimile apparatus. There, an encoding and decoding method is provided that performs mutual conversion of various data in resolution conversion using an integration run length as an intermediate code, and does not use dedicated encoding / decoding hardware.

  Patent Document 2 discloses a facsimile apparatus that can always reliably detect an EOL signal and terminate communication when receiving an image. There, a parameter P is obtained according to the transmission speed, image quality mode, and transmission image size, the transmission time for two lines is multiplied by the parameter P, and a predetermined time for shifting from reception of an image signal to communication disconnection due to non-detection of an EOL signal. If the EOL signal cannot be detected for this predetermined time, the communication is terminated and the process ends.

In Patent Document 3, in a direct transmission facsimile apparatus that transmits while reading a document, in the case of a document with a small code amount, an underflow occurs in a block transfer of image data to a communication unit, thereby preventing a communication error. Means for doing so are disclosed. In this case, dummy data is inserted so that the code amount of one line of read data is equal to or greater than a reference value.
Japanese Patent Laid-Open No. 5-037794 Japanese Patent Laid-Open No. 10-233908 JP 2000-261673 A

  Unless three types of signals, a tonal signal, a digital modulation signal, and an audio signal are accurately determined and signals other than the target signal are excluded, a desired operation does not proceed. This determination depends on the modulation / demodulation unit 12 as one element, and there is a problem that must be solved that it is difficult to accurately determine the type of communication signal. Since the modulation / demodulation unit 12, which is one element, is designed with emphasis on digital modulation signals, detection conditions for tonal signals and audio signals are simplified. Compared to a digital signal processing element (DSP) designed exclusively for audio, the detection capability of tonal signals and audio signals was inferior. However, although the DSP has an excellent detection capability of tonal signals and audio signals, it does not have a digital modulation / demodulation function and cannot be used as a modulation / demodulation unit.

  The decision of the type of communication signal during the period in which tonal signals and audio signals may be mixed is left to the digital signal processing unit dedicated to audio, and the signal processing after the type of communication signal is determined is executed by the modem unit. . In order to realize this function, a switching unit is connected between a line control unit connected to a telephone (communication) line and a modulation / demodulation unit that modulates / demodulates a signal to be modulated and a digital signal to be demodulated. An audio-only digital signal processor was provided. In a period when there is a possibility that tonal signals and audio signals may be mixed in the communication signals, the switching unit connects the line control unit and the audio dedicated digital signal processing unit, and the audio dedicated digital signal processing unit determines the type of the communication signal. Let it run. After a period during which tonal signals and audio signals may be mixed, the switching unit connects between the line control unit and the modulation / demodulation unit, and performs modulation / demodulation operations similar to those of the prior art.

  In a period when there is a possibility that tonal signals and audio signals are mixed in the communication signal, the audio dedicated digital signal processing unit is in charge of signal processing, and after a period in which tonal signals and audio signals may be mixed has passed Since the modulation / demodulation unit performs the switching process so as to be in charge of signal processing as in the prior art, the modulation / demodulation unit does not malfunction due to the voice response device or the voice uttered by the operator.

  The decision of the type of communication signal in a period where tonal signals and audio signals may be mixed is left to the digital signal processing unit dedicated to audio, and the signal processing after the type of communication signal is determined is executed by the modem unit. . Therefore, a switching unit and a voice-only digital signal processing unit are provided between a line control unit connected to a telephone line and a modulation / demodulation unit that modulates / demodulates a signal to be modulated and a signal to be demodulated. In periods where digital signals may contain tonal signals and audio signals, the switching unit connects the line control unit and the audio-only digital signal processing unit, and the audio-only digital signal processing unit identifies the audio. Executes communication signal type determination. After a period during which tonal signals and audio signals may be mixed, the switching unit connects between the line control unit and the modulation / demodulation unit, and performs modulation / demodulation operations similar to those of the prior art.

  FIG. 1 shows the configuration of Embodiment 1 of the present invention. Here, elements corresponding to the conventional example shown in FIG. The telephone (communication) line 1 is connected to the line control unit 11. The line control unit 11 is connected to the switches SW1 and SW2 of the switching unit 15 by signals 3a and 3b which are communication signals. The signal 3a is a digital modulation signal sent from the telephone line 1 side via the line control unit 11, and the signal 3b is a digital modulation signal sent to the telephone line 1 side via the line control unit 11. The switches SW1 and SW2 are switched so as to select the contact point a or b by switch switching signals 17a and 17b output from the switching controller 16.

  The signal 5a obtained at the contact a of the switch SW1 is applied to the modulation / demodulation unit 12, demodulated, and output as a digital signal 9. When the digital signal 9 is applied to the modulation / demodulation unit 12, it is digitally modulated and output from the modulation / demodulation unit 12 as a signal 5b and connected to the contact a of the switch SW2. The modulation / demodulation unit 12 has been commercially available, and is the same as that shown in FIG. The digital signal 9 is, for example, facsimile image data or an audio signal. When the contact a of the switches SW1 and SW2 is selected, the signal 5b is applied to the line control unit 11 as the signal 3b and sent to the telephone (communication) line 1.

  When the contact b of the switches SW1 and SW2 is selected, the audio dedicated digital signal processing unit 19 is connected to the line control unit 11 by the signals 7a and 7b for determining the type of communication signal. In a period in which tonal signals and audio signals may be mixed in the signals 3a and 3b, the switching unit 15 selects the contact b of the switches SW1 and SW2, and the line control unit 11 and the audio dedicated digital signal processing unit 19 Are connected, and the audio-only digital signal processing unit 19 is made to determine the type of communication signal. After a period when there is a possibility that tonal signals and audio signals are mixed, the switch 15 selects the contact a of the switches SW1 and SW2, and connects the line control unit 11 and the modem unit 12 to each other. The same modulation / demodulation operation as before is performed.

  The audio-only digital signal processor 19 is a digital signal processing element (DSP) designed for audio only and is commercially available. Although it has an excellent detection capability for tonal signals and audio signals, it does not have a digital modulation / demodulation function and cannot be used as the modulation / demodulation unit 12. This DSP element has a long tonal signal detection time of 360 ms, and monitors the change in power during that period to discriminate between the audio signal and the tonal signal. ing.

  FIGS. 2, 3 and 4 show an example of the flow of operations when communication is performed using two devices shown in FIG. Devices A and B have started operation, are connected via telephone line 1, and are about to start facsimile (FAX) transmission from device A to device B (S1, FIG. 2). When dialing from apparatus A (S2), connection is made to apparatus B via telephone line 1. Since there is a possibility that a tonal signal and a voice signal are mixed in the signal of the telephone line 1 from the device B thereafter, the switching controller 16 of the switching unit 15 operates to switch to the contact b of the switches SW1 and SW2. (S3).

  Therefore, the device B confirms the incoming call (S4Y). For example, the device B sends a response voice to the device A, for example, “Please wait for a while now” (S5), and the device A receives this by the audio dedicated digital signal processing unit 19 (S6). ). Subsequently, the device B sounds a ringing tone (ringing tone) and simultaneously sends a ringing tone notifying the device A that the calling is in progress (S7). The device A receives this ringing sound by the voice-only digital signal processing unit 19 and thereby knows that the device B is calling (S8). In the device B, since there is a possibility that a tonal signal and a voice signal are mixed in the signal of the telephone line 1 from the device A thereafter, the switching controller 16 of the switching unit 15 operates to switch the switches SW1 and SW2. Switch to contact b (S9).

  In the device B, when the handset is taken (off-hooked) (S10Y, FIG. 3), the telephone call is started (S11). If the handset is not picked up (still on hook) (S10N), it waits for reception of a CNG signal from apparatus A (S12). Here, the CNG signal is included in the tonal signal, and “facsimile transmission is performed from the facsimile sender (in this case, apparatus A) side to the facsimile receiver (in this case, apparatus B) side. It is a signal notifying that it is in a state where it can be performed. Thus, when device B receives a CNG signal from device A, it can be seen that device A is trying to send a facsimile (not a voice signal). If the device B does not receive the CNG signal for a predetermined period, the device B returns to step S7 (S12N).

When the CNG signal is received from the device A (S12Y), the device B sends a CED or DIS signal to the device A (S13). Here, the CED (DIS) signal is included in the tonal signal and notifies “facsimile reception is possible (modem signal can be received)”. The CNG signal reception side (in this case, the device B) ) To the side that transmitted the CNG signal (in this case, device A). Device A remains not receive this CED or DIS signal (S14n), until a predetermined period of time T ₁ is elapsed (S15N), waits for detection of the CED (or DIS) signal (S16N), device CNG signal Send to B and return to step S14 (S17). When a predetermined time period T ₁ is had elapsed in step S15 to disconnect the (S15Y), the telephone (communication) line 1 (S18). If CED is detected in step S16, the process returns to step S14 (S16Y).

  In the device B, there is no possibility of mixing tonal signals and audio signals, so the switching controller 16 of the switching unit 15 operates to switch to the contact a of the switches SW1 and SW2, and the modem unit 12 operates (S19). . If device A receives a CED or DIS signal in step S14 (S14Y), if the signal received from device B is not a DIS signal or DTC signal (S20N, FIG. 4), the telephone (communication) line is disconnected. (S21).

  If the signal received from the device B is a DIS signal or a DTC signal (S20Y), since the device B is ready for facsimile reception, for example, the device A may have a mixture of tonal signals and voice signals. Therefore, the switching controller 16 of the switching unit 15 operates to switch to the contact a of the switches SW1 and SW2 (S22), the modem unit 12 operates, transmits a facsimile (FAX), and ends the operation ( S23). The apparatus B ends the operation when the reception of the facsimile (FAX) is completed (S24). As is clear from the above description, during the period in which the tonal signal and the audio signal may be mixed, the audio dedicated digital signal processing unit 19 is in charge of signal processing, and in the period in which there is no possibility of mixing, the modem unit 12 Therefore, the type of communication signal is accurately determined.

  FIG. 5 is a detailed circuit diagram of the important component switching unit 15 shown in FIG. The switching unit 15 includes switches SW1 and SW2 for switching the contacts a and b, and a switching controller 16 for obtaining switch switching signals 17a and 17b for switching the switches SW1 and SW2. Since the signals 5a and 5b and the signals 7a and 7b are connected to the switching controller 16, the status of each signal can be constantly monitored, and the switch switching signals 17a and 17b can be appropriately output.

  The operation instruction signal 5c is a signal that is applied to the modem unit 12 when the switches SW1 and SW2 are switched from the contact point b to a to instruct the start of the modem operation. Therefore, even when the operation instruction signal 5c is not applied, for example, the modulation / demodulation unit 12 can detect that the switches SW1 and SW2 have been switched from the contact point b to a by the signal 5a and start the operation. This operation instruction signal 5c is unnecessary. Similarly, the operation instruction signal 7c is output to the audio dedicated digital signal processing unit 19 at the beginning of a period in which tonal signals and audio signals may be mixed, and starts its operation. Even when the signal 7c is not applied, for example, when the audio-only digital signal processing unit 19 can detect that the switches SW1 and SW2 have been switched from the contact point a to b by the signal 7a and start the operation. The operation instruction signal 7c is unnecessary.

  FIG. 6 is another detailed circuit configuration diagram of the important component switching unit 15 shown in FIG. Since the switching controller 16 always recognizes that the switches SW1 and SW2 are at the contacts a or b depending on the state of the switch switching signal 17, if the signals 3a and 3b are monitored, the switching timing is accurately determined. can do. For example, when in contact a, signals 3a and 3b are the same as signals 5a and 5b, and when in contact b, signals 3a and 3b are the same as signals 7a and 7b.

  In the case of FIG. 6, as in the case of FIG. 5, the operation instruction signal 5c is a signal that is applied to the modem unit 12 when the switches SW1 and SW2 are switched from the contacts b to a to instruct the operation. Therefore, even when the operation instruction signal 5c is not applied, for example, the modulation / demodulation unit 12 can detect that the switches SW1 and SW2 have been switched from the contact point b to a by the signal 5a and start the operation. This operation instruction signal 5c is unnecessary. Similarly, even if the operation instruction signal 7c is not applied, the audio dedicated digital signal processor 19 detects that the switches SW1 and SW2 have been switched from the contacts a to b, for example, by the signal 7a and starts the operation. This operation instruction signal 7c is not necessary.

It is the circuit block diagram which showed the Example of this invention. (Example 1) 3 is a flowchart showing a flow of operations of the apparatus shown in FIG. FIG. 3 is a flowchart showing an operation flow of the apparatus shown in FIG. 1 together with FIG. FIG. 4 is a flowchart showing an operation flow of the apparatus shown in FIG. 1 together with FIGS. FIG. 2 is a detailed circuit configuration diagram of an important component switching unit shown in FIG. 1; FIG. 4 is another detailed circuit configuration diagram of the important component switching unit shown in FIG. 1; It is the circuit block diagram which showed the prior art example. FIG. 8 is a flowchart showing a flow of operations of the conventional apparatus shown in FIG. FIG. 8 is a flowchart showing the operation flow of the conventional apparatus shown in FIG. 7 together with FIG. FIG. 8 is a flowchart showing an operation flow of the conventional apparatus shown in FIG. 7 together with FIGS.

Explanation of symbols

1 Telephone line
3, 3a, 3b, 5, 5a, 5b, 7a, 7b signal
5c, 7c Operation instruction signal
9 Digital signal
11 Line control section
12 modem
15, 15B switching part
16,16B switching controller
17a, 17b Switch switching signal
19 Audio-only digital signal processor SW1, SW2 switch

Claims (10)

Line control processing (11) for line control of communication signals (3a, 3b) sent to and received from the communication line (1)
In a mixed period in which at least one of a tonal signal and an audio signal may be mixed in the communication signal (3a, 3b), a type determination signal for determining the type of the communication signal (3a, 3b) (7a, 7b), and after the mixed period has elapsed, a switching process (15, 15B) is performed for switching to the modulation signal (5a, 5b) to be communicated.
In the type determination signal (7a, 7b), by identifying the audio signal, the digital signal processing (19) dedicated to audio for determining the type of the tonal signal and the audio signal is performed,
To demodulate the received signal (5a) of the modulated signals (5a, 5b) to be communicated and to obtain the signal (5b) to be transmitted of the modulated signals (5a, 5b) to be communicated by modulation A communication signal type determination processing method for performing modulation / demodulation processing (12). In the switching process (15),
In order to determine the mixed period, a switching control process for monitoring the modulation signals (5a, 5b) and the type determination signals (7a, 7b) to be communicated, determining the mixed period, and performing switching control ( 16. The communication signal type determination processing method according to claim 1, wherein 16) is performed. In the switching process (15B),
The communication signal type determination process according to claim 1, wherein a switching control process (16B) for monitoring the communication signal (3a, 3b) and determining the mixing period to perform switching control is performed in order to determine the mixing period. Method. In the switching process (15, 15B),
The communication signal type determination processing method according to claim 1, wherein the modulation / demodulation processing operation instruction signal (5c) for instructing to start the modulation / demodulation processing (12) immediately after the mixed period has elapsed. In the switching process (15, 15B),
The communication signal type determination processing method according to claim 1, wherein a sound determination operation instruction signal (7c) for instructing to start the sound dedicated digital signal processing (19) is output at the start of the mixed period. Line control means (11) for line control of communication signals (3a, 3b) transmitted and received to the communication line (1);
In a mixed period in which at least one of a tonal signal and an audio signal may be mixed in the communication signal (3a, 3b), a type determination signal for determining the type of the communication signal (3a, 3b) (7a, 7b), and switching means (15, 15B) for switching to the modulated signal (5a, 5b) to be communicated after the mixed period has passed,
In the type determination signal (7a, 7b), a voice-dedicated digital signal means (19) for determining the type of the tonal signal and the voice signal by identifying the voice signal;
To demodulate the received signal (5a) of the modulated signals (5a, 5b) to be communicated and to obtain the signal (5b) to be transmitted of the modulated signals (5a, 5b) to be communicated by modulation A communication signal type determination processing apparatus including the modulation / demodulation means (12). The switching means (15)
In order to determine the mixed period, switching control means for monitoring the modulation signals (5a, 5b) and the type determination signals (7a, 7b) to be communicated, determining the mixed period, and switching control ( 16. The communication signal type determination processing device according to claim 6, further comprising: The switching means (15B)
7. The type of communication signal according to claim 6, further comprising switching control means (16B) for monitoring the communication signal (3a, 3b) to determine the mixed period, and determining and controlling the mixed period. Judgment processing device. The switching means (15, 15B)
The communication signal type determination processing device according to claim 6, wherein the modulation / demodulation processing operation instruction signal (5c) for instructing the modulation / demodulation processing means (12) to start operation immediately after the mixed period has elapsed. The switching means (15, 15B)
The communication signal type determination processing device according to claim 6, wherein a sound determination operation instruction signal (7c) for instructing the sound dedicated digital signal processing means (19) to start operation is output at the start of the mixed period.

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