JPH08223286A - Busy tone generator and busy tone generating method - Google Patents

Abstract

PURPOSE: To obtain a busy tone generating device and the busy tone generating method with respect to a digitally coded voice signal suitable for real time processing by replacing a partial period of a digital voice signal with a generated insertion signal with economy and less deterioration in the quality due to signal insertion. CONSTITUTION: The generator is provided with a signal insertion command means 530 commanding insertion of an insertion signal to a digital voice signal when an interrupt request is issued from another device in a busy state, with an insertion signal generating means 520 that generates the insertion signal with signal intensity of the same level as that of the digital voice signal and a frequency spectrum component with a wide band than that of the digital voice signal and generates the insertion signal coded by the same system as that of the digital voice signal on the opportunity of the command by the signal insertion command means 530, and also with a replacement means 510 replacing the partial period of the digital voice signal with the insertion signal generated by the insertion signal generating means 520. Then the two signals are superimposed by replacing part of the voice signal with the insertion signal generated when the insertion signal is generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a busy ring tone generating apparatus and a busy ring tone generating method, and more particularly to inserting a signal into a digitally encoded voice signal economically without deterioration of voice quality. Ringing tone generating apparatus and a busy ringing tone generating method for the same.

[0002] The present invention superimposes a call request from another person on a voice during a call (inserts a ringing tone during a call), and uses a public line or a local line or a private line to make a video conference of another speaker. A service that alerts the caller or provides other information to the caller by superimposing another signal or voice on the call code that has been digitally encoded, such as an interrupt signal or voice being superimposed on the voice during conversation. The present invention relates to a busy ring tone generating device and a busy ring tone generating method.

[0003]

2. Description of the Related Art When analog processing is performed on a voice signal,
By appropriately selecting the level of the signal to be inserted and adding both signals by the adder, the inserted signal can be identified with almost no interference with the inserted voice.

FIG. 11 shows an example of transmitting a busy ring tone in an analog (space division type) exchange. The system shown in the figure has a local exchange 10, a long distance communication system 20, and a local exchange 30 between subscribers A, B and C.
The local exchange 30 has an oscillator 31, an addition relay 32, and an exchange 33.

In this system, when subscriber A and subscriber B are in a call and the exchange 33 of local exchange 30 detects a call request from subscriber C to subscriber A, the oscillator 31 outputs a predetermined signal. And the communication voice signal between the subscriber A and the subscriber B are added by the addition relay 32 and sent to the transmission line for the subscriber A.

FIG. 12 is a conceptual diagram when a busy ring tone is added to a call voice in a conventional analog telephone system.
In the figure, Q represents the spectrum of the speech voice and P represents the spectrum of the incoming call signal. As described above, when the call request from the subscriber C is detected, since both lines are analog, the signal sound is added to the call voice signal from the subscriber A to the subscriber B, and the busy signal is given. If the ring tone signal level is appropriately selected, as shown in the figure, the call sound and the signal sound of the busy call are added, and the busy ring tone signal (P) almost interferes with the call voice (Q). You can confirm that there is an incoming call without giving.

However, for example, when a voice signal is digitally encoded and processed as in a time-division exchange or a video conference system, the digitally encoded voice signal is compressed and non-linearly encoded. Therefore, the audio signal and the insertion signal cannot be easily added as described above. There are two methods for adding a plurality of digitally encoded signals.

The first method is a method of removing a part of a voice signal and replacing it with a signal to be inserted, as shown in FIG. In the example of the same figure, b between the call voice signals a1 and a2 is replaced with an incoming call signal. In addition, the second method is a method of converting an encoded signal into a state in which it can be simply added and processing the same as with an analog signal. FIG. 14 shows the processing of an incoming call busy signal by a conventional digitized signal.

Step 10) The busy voice signal is decompressed and added back to the linear code before addition. Step 11) Add the voice signal returned to the linear code and the insertion signal. Step 12) Non-linear conversion is performed, compression is performed, and the original coding format is restored to obtain the audio signal of the addition result.

Further, as the conventional insertion signal, a signal sound such as a sine wave intermittent sound or a low frequency signal having a time conversion whose amplitude envelope of the sine wave is slow is used. Such signals are signals with a single line spectrum or a simple line spectrum configuration.

[0011]

However, the conventional method of superposing another signal on the digitally encoded voice signal has the following problems. The first method has a problem that a person who receives a voice with a signal inserted cannot hear the other party's call because the voice of the communication partner is blocked by the inserted signal and heard. is there.

In the case of a busy ring tone, the subscriber A who has received the busy call immediately switches the calling party to the interrupting party C by the operation such as hooking and cancels the interruption. This is because it is designed on the assumption that However, in general, even if there is an interruption, the subscriber A often continues the call with the subscriber B as it is. Further, since the ringing tone is returned to the interrupting subscriber C, it is difficult to distinguish whether the incoming call is an incoming call or a normal incoming call. Therefore, the ringing tone is often waited for 6 to 7 times. In such a case, the subscriber A cannot listen to the call with the subscriber B with sufficient intelligibility, which increases frustration.

That is, the exchange inserts "busy ring tone" and voice in a call, and controls the timing and duration of signal insertion, such as a telephone service that informs the recipient of an incoming call from a third party. If the person is not the sender / receiver of the voice, the recipient remains in a state where it is hard to hear for a long time, which is a serious factor for lowering the service quality.

Further, in the second method, as in the case of the analog exchange, the busy incoming call is added to the call voice signal, so that the deterioration as in the first method does not occur. However, unlike the case of the analog signal, since the voice signal is non-linearly encoded, it is not possible to simply add the signals, and once the inverse conversion of compression is performed to restore the linear code, It is necessary to perform addition with the busy ring tone and then perform compression nonlinear conversion again. Furthermore, new hardware such as a signal compression / expansion circuit is also required in the voice superimposing unit, such as addition that is synchronized with the call signal, which imposes a heavy economic burden. There are problems such as not facing.

The present invention has been made in view of the above points, is economical, has little deterioration in quality due to signal insertion, and is capable of generating a busy incoming call for a digitally encoded voice signal suitable for real-time processing. An object of the present invention is to provide a device and a method for generating an incoming call.

[0016]

FIG. 1 is a block diagram showing the principle of the present invention. SUMMARY OF THE INVENTION The present invention is a busy ringtone generator that inserts an insertion signal into at least one place in a compressed and nonlinearly encoded digital voice signal to generate another ringtone during a call. When an interrupt request from is issued,
A signal insertion instructing means 530 for instructing insertion of an insertion signal in the digital audio signal, and triggered by the instruction of the signal insertion instructing means 530, a signal strength at the same level as that of the digital audio signal and a frequency spectrum component of a wider band than the digital audio signal. And an insertion signal generating means 520 for generating an insertion signal encoded by the same method as the digital audio signal.
And a replacement unit 510 that replaces a partial section of the digital audio signal with the insertion signal generated by the insertion signal generation unit based on the instruction of the signal insertion instruction unit 530.

Further, in the above-mentioned replacing means 510, a partial section is set between 20 msec and 120 msec. Further, the signal insertion instructing means 530 described above stores the interruption request source information, interruption destination information and insertion signal type information in the first interruption information storage means and the first interruption information to the insertion signal generating means. It includes an interrupt information transmitting means for transmitting the information stored in the storage means as a set to the insertion signal generating means.

Further, the above-mentioned first interrupt information storage means is
It includes instruction selection information for selecting whether or not to give an instruction to insert a signal when an interrupt request is issued. Further, the insertion signal generation means 520 searches the insertion signal storage means based on the insertion signal storage means for holding the insertion signal generated in advance and the insertion signal type information acquired from the interrupt information transmission means, An insertion signal transmitting means for transmitting the obtained insertion signal to the replacing means is included.

Further, the above-mentioned insertion signal generation means 520 is
When the second interrupt information storage unit in which the interrupt request source information, the interrupt destination information, and the type information of the insertion signal are registered in advance, and the instruction for generating the insertion signal is input from the signal insertion instruction unit 530, When the interrupt request source is not registered in the second interrupt information storage means, it has means for not generating an insertion signal.

FIG. 2 is a flow chart for explaining the principle of the present invention. The present invention is a method for generating a ringing tone during a call, in which an insertion signal is inserted into at least one place in a compressed and nonlinearly encoded digital voice signal to generate another ringing tone during a call. When the interrupt request is issued from the digital voice signal (step 1), the digital voice signal is instructed to insert the insertion signal (step 2), and the signal intensity of the same level as that of the digital voice signal output by the insertion instruction,
An insertion signal having a frequency spectrum component of a wider band than that of the digital voice signal and encoded in the same method as the digital voice signal is generated (step 3), and the digital voice signal of the digital voice signal is generated based on the instruction to insert the insertion signal. Part of the section is replaced with the insertion signal (step 4).

In step 2, it is judged whether or not the subscriber has subscribed to the service for interruption, and if not, the instruction for insertion is not given. In step 4,
When replacing a part of the digital audio signal with the insertion signal, the part of the part is set between 20 msec and 120 msec.

In step 3, when the insertion signal is generated, the insertion signal generated in advance is held, and when the insertion of the signal is instructed, the interruption request source information, the interruption destination information, and the insertion signal The type information and the type information are transmitted as a set, and the held insertion signal is selected and output based on the instruction to output the insertion signal.

Further, according to the present invention, the interrupt request source information is registered in advance, and when the interrupt request source that issued the interrupt request is not registered, the insertion signal is not generated.

[0024]

According to the present invention, the signal level is equivalent to that of the voice signal which is the inserted signal, has a frequency component in a wider band than the voice signal which is the inserted signal, and is the voice signal which is the inserted signal. A signal encoded in the same format as is generated as an insertion signal, and a part of the voiced signal is replaced by the insertion signal generated at the time of generating the insertion signal so that the two signals are superimposed.

Usually, a continuously uttered voice includes one phoneme, music before and after a syllable, and a syllable contains information about the phoneme or syllable because of continuous movement of vocal organs. There is. That is, as we normally think, there is a section corresponding to the phoneme or syllable in the continuously uttered speech, and these sections are continuously connected to form the entire continuous speech. It doesn't mean that.

For example, if utterance is made consecutively with / ape /, the sound of / p / is called a closing sound, and since the two lips are once brought together, generally the vowel sound uttered prior to "p". Between the part corresponding to the part and the rupture part of / p /, 120
There is a clear silent section of about msec. Therefore, although there is a boundary corresponding to / a / and / pe / at first glance, the preceding vowel / a / contains much information effective for the perception of / p /. .

Similarly, much information effective for the perception of / p / is included in the portion corresponding to the subsequent vowel / e /. In this way, the information necessary for evoking phoneme perception is distributed temporally in continuously uttered speech (Makio Kashino, “Japanese words based on clues distributed before and after a closed interval”). Perception of Medium Closing Sound ", Journal of Acoustical Society of Japan
48, 2 (1992) pp. 76-86). Therefore, even if a part of the continuously uttered voice is replaced with noise up to about a hundred and several tens of msec, it is perceived that the part of the voice replaced with noise is actually present, and the noise actually exists. It sounds as if noise was superimposed on a part different from the part that was written. Such a phenomenon is called a phoneme restoration phenomenon. The following is a specific example of this phenomenon. The upper part of Fig. 3 is the waveform (amplitude) of the voice signal that a man uttered "The sound of the violin is", and the lower part is the sound spectrogram (change pattern of the strength of each frequency component) due to utterance, and the color is The darker the black part, the greater the strength. The katakana characters are the approximate position where you can hear each syllable.

FIG. 7A shows the original voice, and FIG. 9B shows the case where 100 msec around “L” is replaced with a signal (white noise in the example of the figure) that masks the component of the audio signal. An audio signal waveform and a sound spectrogram are shown. Even if a part of the audio signal is replaced as shown in FIG. 9B, the voice does not seem to be interrupted, and it can be heard as before the replacement. And the noise can be heard in a position that is not right.

It is considered that such a phoneme restoration phenomenon is related to the above-mentioned temporal dispersion of music information, top-down influence by a psychological dictionary, and the like. (Kimihisa Kondo, Kazuhiko Kakei; "Influence of Kanji / Kana word presentation on music perception",
Acoustical Society Autumn Lecture Meeting 2-1-8 (63.10).

As described above, in order to cause a phoneme restoration phenomenon in the auditory system by perceptual integration by interpolating a portion replaced by noise or the like by using information widely dispersed in time and a psychological dictionary, voice replacement is required. A certain condition is required for the signal of the part to be turned on. Replace the signal that meets the above conditions with part of the voice,
By inserting, the inserted signal can be heard with almost no interference with the voice quality during a call, and the economical burden for maintaining the call quality can be reduced.

The upper and lower limits of the duration of the insertion signal are set in consideration of the time width that human beings can perceive as sound and the phoneme restoration ability, and as shown below, 20 msec to 1
When it is set to 20 msec, it is easy to hear both the insertion signal and the voice signal when the signals are superimposed. Further, according to the present invention, when the subscriber does not use the service for accepting the interrupt request, the insertion sound is not generated when the interrupt request is issued from another person.

Further, according to the present invention, a number of kinds of insertion sounds are registered in advance, and a predetermined kind of insertion sound is selected when the interrupting subscriber and the interrupt request are issued by the subscriber. By interrupting the call signal by the user, it becomes easy to determine from whom the interrupt is made.

Further, by registering only subscribers who permit interrupts in advance, it is necessary to insert an insertion sound into a call signal when an interrupt request is issued by a party who does not want to permit interrupts. There is no.

[0034]

Embodiments of the present invention will now be described in detail with reference to the drawings. The following embodiment will be described by taking as an example the case where the present invention is applied to a digital time-division exchange that implements a service in which a busy ring tone is inserted to notify a subscriber in a call that there is a connection request from another company.

FIG. 4 is a system configuration diagram of an embodiment of the present invention. Terminal 100 of each subscriber B, terminal 2 of subscriber A
00, the terminal 300 of the subscriber C, the handset,
It is assumed to have a terminal including a digital encoding unit and a digital decoding unit. Although the terminals 100, 200, and 300 have both transmitting and receiving functions, the terminal 100 is displayed as having the transmitter 110 and the terminal 200 as having the receiver 210.

The voice uttered by the subscriber B is digitally encoded by the digital encoder 120 of the terminal 100 of the subscriber B and input to the digital exchange 500 which accommodates the subscriber A who is the other party of the call. The exchange 500 extracts a signal for the subscriber A from the input signal and transmits it to the subscriber A. In the terminal 200 of the subscriber A, the received digital code is decoded by the digital decoding unit 220, and the utterance content of the subscriber B is output from the handset 210 as voice.

FIG. 5 is a sequence chart showing the operation when the communication shown in FIG. 4 is performed. When subscriber A and subscriber B are in a call between terminals 100 and 200 connected to digital time division switch 500 (step 101), subscriber C's terminal 300 calls subscriber A. If so (step 102), the exchange 500 superimposes / inserts the ringing tone signal on the call voice and sends it to the subscriber A (step 103). As a result, the subscriber A can know that there is an incoming call from the other party even if the subscriber A is talking with the subscriber B (step 104).
Further, the subscriber C responds from the exchange 500 (ring tone) as if the subscriber A is not busy even when the subscriber A is busy.
(Step 105). When the subscriber A hears the call signal in which the ring tone (hereinafter, ringing tone) is inserted / superposed on the call voice (step 106), the call with the subscriber B is temporarily interrupted by the hooking operation of the telephone or the like. Then (step 107), a call can be made with the subscriber C (step 108).
Services are provided.

FIG. 6 is a diagram for explaining a digital exchange according to an embodiment of the present invention. The digital exchange 500 has the functions of an ordinary exchange such as call acceptance, relay, transmission control, etc. In the figure, when the subscriber B and the subscriber A are in a talking state, the subscriber C Only the part directly related to the state in which the subscriber A is notified that there is a call request is shown.

Further, in the figure, it is shown that the subscriber B is directly connected to the call voice receiving section 540 and the subscriber C is directly connected to the interrupt receiving section 530.
Also, the exchange that receives the call request from the subscriber C shall be provided with the functions of identifying the type of call, identifying the state of the connection partner line, and checking the service contents that the calling / called subscriber can receive. , The description is omitted in FIG.

The digital exchange 500 includes a signal replacement unit 5
10, a ringing tone generating unit 520, an interruption receiving unit 530, a call voice receiving unit 540, a call voice transmitting unit 550. The call voice receiving unit 540 receives the call signal from the subscriber B and sends it to the signal replacing unit 510. The call voice transmitting unit 550 sends a call signal including the insertion sound sent from the signal replacing unit 510 to the subscriber A.

The signal replacing section 510 is composed of a signal inserting section 511 and a time slot allocating section 512, and outputs the digitally encoded call signal output from the call voice receiving section 540 to each destination subscriber / switch. Allocate time slots by allocating them as described above. Signal replacement unit 5
The signal inserting unit 511 of 10 receives the code information of the inserting signal from the busy ring tone generating unit 520, when the interruption receiving unit 530 instructs the insertion voice signal to be inserted into the designated calling voice for the subscriber. The time slot allocating unit 512 allocates a part of the time slots to be allocated to the call signal on the designated communication path to the insertion signal so that the following conditions are satisfied.

As a time slot allocation condition at the time of signal insertion, the duration of the insertion signal is 120 msec: The interval time between the call voice and the insertion signal is within 20 msec: Note that such a time slot allocation condition is It is set for the following reasons. Normally, the duration of a spoken word varies depending on the type of phoneme used, but VCV sounds are short for plosives, etc., and are about several msec to 20 msec.
The closed section is 50 to 100 ms. The frictional noise is about 130 msec to 150 msec. There is a measurement result that it is about 190 ms for vowels. It is known that this is shortened by 50 to 70% in a single sentence.

Further, the phoneme restoration phenomenon in which the original voice can be heard even when the voice of the burst part in the VCV voice is replaced by noise shows a phoneme restoration rate of about 80% even when the noise length is 70 ms. This means that the information for perceiving a phoneme is dispersed over 200 ms.

From the above, depending on the type of sound used, from 20 ms which can be heard as a sound to around 100 ms which is considered to be the window length of the auditory system, and the average minimum duration of phonemes is approximately Considering that the information is dispersed for 70 to 80 ms, the upper limit is considered to be 120 ms or less as a reasonable length.

As a result of the replacement using the time slot allocation condition as described above, part of the call signal is replaced by the insertion signal, and the insertion signal is interrupted by the call signal as shown in FIG. 3 (b). To be played back. That is,
An insertion signal is inserted at a position corresponding to "ri" in FIG.

Regarding the insertion position of the insertion signal, it is not necessary to consider the relationship with the voice of the call (for example, it is not necessary to detect the silent state and insert the signal at that position), and at a fixed time interval (for example, It may be inserted at 1 second intervals. In response to an instruction from the interrupt reception unit 530, the busy ring tone generation unit 520 encodes the insertion sound (bus busy ring tone) in the same format as the call voice and outputs the coded sound to the signal insertion unit 511 of the signal replacement unit 510. The inserted sound has a frequency spectrum distribution wide enough to mask the voice, and the signal level is a signal having an intensity level equal to or higher than that of the speech voice.

In setting the signal level, the signal level may be set based on existing statistical information, or a measurement / judgment function for measuring and judging the signal level of the voice during the call at the interruption destination is provided in the exchange. The signal level of the insertion signal may be set based on the result of the measurement / judgment function.

The following method can be considered for generating the inserted sound. Each time a request is made, a signal is generated, encoded, and output. In this method, the coding method can be selected according to the speech coding method to be inserted. The insertion sound generated in advance is stored in the insertion sound storage unit 521, and when an insertion request is made, the signal pattern is read from the insertion sound storage unit and output. In this method, the processing time can be shortened as compared with the above method. Furthermore, multiple types of insertion sounds are prepared, the subscriber specifies the type of insertion sound in advance for each interrupter, and the subscriber who listens to the insertion sound accepts or rejects the interruption depending on the type of insertion sound. It is also possible to configure so that the judgment information of can be acquired.

An example of this configuration is shown in FIG. The figure shows an example of insertion sound registration according to an embodiment of the present invention. In the example of the figure, the subscriber A, when a sound of the type "K" (determined by tone color, rhythm, etc.) is inserted into the call voice, calls "03-1234-5678".
It is possible to identify that there is a call request from the telephone number / subscriber, and if a sound such as "P" is inserted during a call, it can be recognized that the interruption is from someone other than the registered person.

Further, only the opponent who is allowed to interrupt is registered in the insertion sound storage unit 521, and the opponent who is not registered is not allowed to interrupt. That is, there is a method of not generating the insertion signal. The interrupt reception unit 530 receives a connection request to the subscriber accommodated in the own exchange by the call connection request reception unit 531. Next, the interrupt necessity determination unit 532
When the subscriber of the connection request destination is using the interrupt service by referring to the service usage status (FIG. 8) of each user of the storage unit 5321, the subscriber of the connection request destination is busy. In the case where the usage service form shown in FIG. 8 uses “interrupt”, the busy ring tone generation unit 520
To the signal replacement unit 510, which instructs the insertion of the insertion signal received from the busy ringing tone generation unit 520 into the call signal and the information for specifying the insertion target speech path.
To the signal insertion unit 511.

Further, in the utilization service form shown in FIG. 8, when the subscriber who is the interrupt request destination is a subscriber who does not perform "transfer" or "interrupt", the interrupt necessity determination unit 532 determines " It is determined that "interruption is unnecessary", and the busy ringing tone generation unit 520 is not instructed to generate an insertion tone. At this time, the busy tone is returned to the subscriber C. Further, FIG. 8 shows that the subscriber B is not using both the “interrupt” and “forward” services.

<First Specific Example> Next, as a first specific example, the subscriber C joins while the subscriber A and the subscriber B connected to the digital time division exchange 500 are talking. Exchange 500 when calling person A
The operation will be specifically described. In the specific example described below, it is assumed that the use service registration status information of each subscriber shown in FIG. 8 is included in the interrupt necessity determination unit 532.

(1) When the subscriber A and the subscriber B are busy, the subscriber C (telephone number: 075-123-1111) calls the subscriber A to the digital time division exchange 500. Issue a connection request. (2) The call connection request reception unit 531 of the interrupt reception unit 530 of the digital time division exchange 500 receives the call connection request from the subscriber C.

(3) The call connection request acceptance section 531 notifies the interrupt necessity determination section 532 of the call connection request acceptance. (4) Whether the interrupt necessity determination unit 532 makes an interrupt request according to the registration status of the subscriber (subscriber C) who issued the call connection request with reference to the service usage registration status information (FIG. 8). To decide. In the example of FIG. 8, since the subscriber C has registered the fact that he / she has an interrupt contract, the interrupt necessity determination unit 5
32 determines that the subscriber A accepts the interrupt.
As a result, the interrupt necessity determination unit 532 accepts the interrupt request and requests the busy ring tone generation unit 520 to generate the insertion sound signal. It also instructs the signal inserting unit 511 of the signal replacing unit 530 to transmit the insertion sound signal to the subscriber A.

(5) The busy ring tone generation unit 520 refers to the insertion tone registration list (FIG. 7) stored in the storage unit 521 by the telephone number (075-113-1111) of the subscriber C.
Recognize that the inserted sound type is "M". (6) The busy ring tone generation unit 520 uses the insertion sound storage unit 52.
The insertion sound of the insertion sound type “M” registered in advance in No. 1 is acquired, encoded into the same format as the call voice, and sent to the signal insertion unit 511 of the signal replacement unit 510.

(7) The signal inserting section 5 of the signal replacing section 510
11 is an interrupt necessity determination unit 532 of the interrupt reception unit 530.
If the instruction to send the busy ring tone to the subscriber A is issued, the encoded insertion tone type “M” received from the busy ring tone generation unit 520 is assigned to the time slot allocation unit. Transfer to 512.

(8) The time slot allocating section 512 replaces a part of the section of the call signal with the insertion signal based on a preset condition, and the call voice transmitting section 550.
Send to. (9) The call voice transmitting unit 550 transmits the call signal including the insertion signal to the subscriber A.

<Second Specific Example> Next, as a second specific example, an example in which an interrupt sound is not inserted during a call between subscribers A and B even when a connection request is issued by the subscriber C Will be explained. In this example, when the insertion sound registration list registered in the storage unit 521 of the busy ring tone generation unit 520 has the content shown in FIG. 9, that is, the subscriber C interrupts the subscriber A by an interrupter (075). -123-1111) will be explained.

Originally, the telephone number of the subscriber C is "075-123-11
11 ”. However, if the telephone number of the subscriber C is not registered and the type of the inserted sound is not registered in the field of the interrupter of the subscriber A in the list shown in FIG. Do not generate. That is, the interrupt reception unit 53
Even if it is judged as “interruption is possible” in the judgment of whether or not the interrupt is necessary at 0, since the telephone number of the subscriber C is not registered in the interrupter column as shown in FIG. 9, it corresponds to “other”. Then
If the type of the inserted sound corresponding to “other” is not registered, the busy ringtone generation unit 520 does not generate the busy ringtone. Therefore, the busy signal is not included in the call signal, and the busy tone is returned to the subscriber C.

<Third Specific Example> In the third specific example, the inserted sound storage unit 521 is not included as a component of the busy ring tone generation unit 520 shown in FIG. 6, and the inserted sound is registered in advance. If not, describe.

FIG. 10 is a diagram (No. 2) for explaining the digital exchange of one embodiment of the present invention. In the figure,
The same components as those in FIG. 6 are designated by the same reference numerals and the description thereof will be omitted. The part different from the configuration of FIG.
20 has an insertion sound generation unit 522. The insertion sound generation unit 522 acquires the call signal from the call signal storage unit 5111 of the signal insertion unit 511 of the signal replacement unit 510, investigates the call signal, and has the same signal strength and a wider band than the digital call signal. Signal of the frequency spectrum component of is generated. Further, the generated signal is stored in the call signal 5
The digital call signal obtained from 111 is encoded by the same method as the digital call signal to generate a digital signal for insertion.

The insertion signal generated in this way is sent to the signal insertion unit 511. The signal insertion unit 511 transfers the received insertion signal to the time slot allocation unit 512 together with the call signal stored in the call signal storage unit 511. The time slot allocation unit 512 sets the duration of the insertion signal to 120 msec and the interval time between the call signal and the insertion signal to 20 msec, and sends it to the call voice transmission unit 550.

Therefore, the busy tone is not included in the call signal, and the busy tone is returned to the subscriber C. In addition, in the second embodiment, even if it is determined in the interruption acceptance / rejection determination in the interruption acceptance unit 530 that “interruption is possible”, the telephone number of the subscriber C is the interruption person's telephone number as shown in FIG. If it is not registered in the column, it corresponds to "Other",
Furthermore, when the inserted tone type corresponding to “others” is not registered, the busy ring tone generation unit 520 controls not to generate the busy ring tone, but in such a case. Even if the insertion sound generator 5 is used by using the third specific example described above.
22, there is also a method of controlling so that an insertion sound is generated and sent to the signal replacing unit 510.

As described above, the voice communication of the telephone system, such as the insertion of a ring tone during a call, has been described as an example. However, the present invention is not limited to the above example, and some signal sound or It is not easy to add and superimpose signal sounds, but if replacement is easy to insert, it is necessary to insert some signal in the middle, for example, in a synthesized voice system controlled by a personal computer. It can be applied in any case.

[0065]

As described above, according to the present invention, even if an insertion signal indicating an incoming call from another is inserted in a call signal, the phoneme restoration phenomenon described in the section of the above action occurs in the auditory system. There is almost no loss of voice quality.

It is also possible to insert it in an arbitrary speech signal (digital signal) in a digitally encoded state. In addition, the inserted signal can be heard clearly. Further, the existing system can be used for the insertion processing, and the system can be constructed with a small change in hardware.

Also, by registering and specifying the interrupting person in advance, it is possible to select a method in which a busy sound is returned to an unregistered interrupting person and the insertion sound is not inserted in the call signal. Is possible. Furthermore, in the present invention, since the signal having many frequency components is used as the insertion signal, the insertion signal can be selected from a wide variety of signals.

[Brief description of drawings]

FIG. 1 is a principle configuration diagram of the present invention.

FIG. 2 is a diagram illustrating the principle of the present invention.

FIG. 3 is a diagram for explaining the operation of the present invention.

FIG. 4 is a system configuration diagram of an embodiment of the present invention.

FIG. 5 is a sequence chart of communication operation between subscribers according to an embodiment of the present invention.

FIG. 6 is a diagram (No. 1) for explaining the digital exchange according to the embodiment of the present invention.

FIG. 7 is a diagram showing an example of an insertion sound registration list according to an embodiment of the present invention.

FIG. 8 is a diagram showing a usage service registration status of each subscriber according to an embodiment of the present invention.

FIG. 9 is a diagram for explaining a second specific example of the embodiment of the present invention.

FIG. 10 is a diagram (No. 2) for explaining the digital exchange according to the embodiment of the present invention.

FIG. 11 is a diagram showing an example of transmitting a busy ring tone in an analog (space division type) exchange.

FIG. 12 is a conceptual diagram when a busy call is added to a call voice in a conventional analog telephone system.

FIG. 13 is a conceptual diagram when a busy ring tone is added to a call voice in an analog telephone system.

FIG. 14 is a diagram showing processing of an incoming call busy signal by a conventional digitized signal.

[Explanation of symbols]

 100 subscriber terminal 110 transmitter 120 digital encoding unit 200 subscriber terminal 210 receiver 220 digital decoder 500 digital exchange 510 signal replacement means, signal replacement unit 511 signal insertion unit 512 time slot allocation unit 520 insertion signal generation means, talk Middle ringtone generation unit 521 Insertion sound storage unit 522 Insertion sound generation unit 530 Signal insertion instruction means, interrupt reception unit 531 Call connection request reception unit 532 Interrupt necessity determination unit 540 Call voice reception unit 550 Call voice transmission unit 5111 Call Signal storage unit 5321 Storage unit

Claims (11)

[Claims] 1. A busy ring tone generating apparatus for generating another ring tone during a call by inserting an insertion signal into at least one place in a compressed and non-linearly encoded digital voice signal. When an interrupt request from another is issued, signal insertion instructing means for instructing insertion of the insertion signal in the digital audio signal, and at the same level as the digital audio signal, triggered by the instruction of the signal insertion instructing means. A signal strength and a frequency spectrum component of a wider band than the digital audio signal,
Insertion signal generation means for generating an insertion signal encoded by the same method as the digital audio signal, and a part of the digital audio signal by the insertion signal generation means based on an instruction from the signal insertion instruction means. A busy ring tone generation device, comprising: a replacement unit that replaces the generated insertion signal. 2. The busy ring tone generating apparatus according to claim 1, wherein, in the replacing means, the partial section is between 20 msec and 120 msec. 3. The signal insertion instructing means stores the interruption request source information, interruption destination information, and insertion signal type information in a first interruption information storage means, and the insertion signal generation means in the first interruption information storage means. 2. The busy ring tone generating apparatus according to claim 1, further comprising an interrupt information transmitting means for transmitting to the insertion signal generating means a set of information stored in the interrupt information storing means. 4. The first interrupt information storage means includes instruction selection information for selecting whether or not to issue a signal insertion instruction when the interrupt request is issued. Ringtone generator. 5. The insertion signal generation means stores the insertion signal storage means for holding an insertion signal generated in advance, and the insertion signal storage means based on the insertion signal type information acquired from the interrupt information transmission means. 4. The busy ring tone generating apparatus according to claim 1, further comprising insertion signal transmitting means for performing a search and transmitting the obtained insertion signal to the replacing means. 6. The insertion signal generating means comprises: second interruption information storage means in which interruption request source information, interruption destination information and insertion signal type information are registered in advance; and the signal insertion instruction means. The talk according to claim 1, further comprising means for not generating an insertion signal when the interrupt request source is not registered in the second interrupt information storage means when the instruction for generating the insertion signal is input. Medium ringtone generator. 7. A busy ring tone generating method for generating another ring tone during a call by inserting an insertion signal into at least one location in a compressed and non-linearly encoded digital voice signal. When an interrupt request from another is issued, the digital voice signal is instructed to insert the insertion signal, and the digital voice signal having the same signal strength as that of the digital voice signal, which is output by the insertion instruction, An insert signal having a frequency spectrum component of a wider band and encoded in the same method as the digital voice signal is generated, and based on an instruction to insert the insert signal, a partial section of the digital voice signal is generated. A method for generating a busy ring tone, which is characterized in that the ringing tone is replaced with the insertion signal. 8. The busy ring tone generating method according to claim 7, wherein when the partial section of the digital voice signal is replaced with the insertion signal, the partial section is set between 20 msec and 120 msec. 9. When instructing insertion of said insertion signal, it is judged whether or not the subscriber has subscribed to the service for interrupting, and if not, the instruction for insertion is not issued. How to generate the busy ringtone described. 10. When the insertion signal is generated, a previously generated insertion signal is held, and when the insertion of the signal is instructed, interrupt request source information, interrupt destination information, and an insertion signal 8. The busy ring tone generation method according to claim 7, wherein the typed information is transmitted as a set, and the held insertion signal is selected and output based on an instruction to output the insertion signal. 11. The busy incoming call according to claim 7, wherein the interrupt request source information is registered in advance, and the insertion signal is not generated if the interrupt request source that issued the interrupt request is not registered. Sound generation method.