JP2006238262A - Key telephone system and gain control method therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a key telephone system in which a call of high voice quality can be made in accordance with a called party terminal, and gain control method therefor. <P>SOLUTION: If a volume change operation is performed by operating a volume key or the like in a volume setting input circuit 24 provided in a key telephone set (TEL) 20, an optimal gain is reset while taking into account setting values of reception gain control circuits 15, 25 (or of transmission gain control circuits 16, 26), thereby preventing voice quality from being deteriorated by increase of a noise level. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a button telephone apparatus, and more particularly to a button telephone apparatus and a gain control method thereof that can control the volume of an incoming / outgoing voice signal to an appropriate value (gain) for obtaining good sound quality.

  The key telephone apparatus (or simple telephone exchange apparatus) is a telephone apparatus constituted by a key telephone main apparatus (ME) and a key telephone or a dedicated telephone terminal (TEL). Such a button telephone device is widely adopted by small and medium enterprises. In the following description, it is referred to as a button telephone apparatus. However, what is assumed by the present invention is a telephone exchange apparatus having a similar function, and is not limited to a button telephone apparatus.

  Techniques relating to or relating to such a button telephone device are disclosed in several known technical documents. There has been disclosed a digital multi-function telephone or a button telephone device that can process volume adjustment of a voice call using a digital signal using a DSP (Digital Signal Processor) (see, for example, Patent Document 1). Also, an exchange communication system is disclosed in which a receiving terminal communication terminal device can always receive a signal at an optimum signal level by providing a key for making a request to change the received signal level in the extension telephone terminal. (For example, refer to Patent Document 2).

JP 2001-36613 A (page 3, FIG. 2) JP-A-5-236538 (page 3-4, FIGS. 2 and 3)

  A conventional general key telephone apparatus includes a reception gain control circuit and a transmission gain control circuit in a key telephone, and is configured so that the user can control the reception gain and the transmission gain with each other terminal. ing. That is, the size of the transmitted / received voice differs depending on whether the call destination terminal connected via the key telephone main unit is the near end (near distance) or the far end (far distance). Therefore, the user of the key telephone can adjust the gain appropriately as necessary by using the communication partner terminal, and can achieve an audio level that is easy to hear.

  Hereinafter, a description will be given based on a specific example. For example, as shown in FIG. 4, it is assumed that the set value of the reception gain of the key telephone main unit is −3 [dB] and the reception gain of the key telephone is 0 [dB]. These gain settings are optimal when the call destination terminal is near-end, but for example, when talking to a far-end call destination terminal, the user of the key telephone can Will feel small and difficult to hear. Therefore, the user of the key telephone operates the volume key of the voice setting input circuit in the key telephone to increase the reception volume. As a result, the reception gain of the key telephone after the volume change is, for example, +6 [dB].

  However, when a necessary gain is obtained by the reception gain control circuit of the key telephone as described above, it is included in the reception voice signal by the reception gain control circuit of the key telephone set to a high gain (for example, +6 [dB]). There is a problem that the quality of the received voice is deteriorated due to the influence of noise and noise from peripheral circuits.

  The present invention has been made in view of the above-described problems of the prior art, overcomes or reduces such problems, and a button telephone device that enables a call with good voice quality according to a call destination terminal and its The main object is to provide a gain control method.

  In order to solve the above-described problems, the key telephone apparatus and the gain control method thereof according to the present invention employ the following characteristic configuration.

(1) In a key telephone apparatus comprising a key telephone main apparatus and at least one key telephone connected to the key telephone main apparatus by an extension.
A reception (or transmission) gain control circuit for controlling a gain of a reception (or transmission) signal provided in each of the key telephone main unit and the key telephone is set in a volume setting input circuit provided in the key telephone. Accordingly, a key telephone apparatus comprising a control device that controls the gain of the key-phone main device and the key-phone reception (or transmission) gain control circuit in cooperation with each other.
(2) The control device executes reception (or transmission) of the key telephone main device and the key telephone based on a setting gain of the reception (or transmission) setting gain control circuit of the key telephone main device and the key telephone. The button telephone device according to the above (1) for determining a gain.
(3) The key telephone apparatus according to (1) or (2), wherein each of the key telephone main apparatus and the key telephone includes a memory, and stores a set value of the set reception (or transmission) gain.
(4) During the next call from the same call partner terminal, the reception (or transmission) gain control of the key telephone main unit and the key telephone is set to the reception (or transmission) gain setting value stored in the memory. The button telephone apparatus according to (3) above, wherein the reception (or transmission) gain of the circuit is set.
(5) The memory stores an initial value of the reception (or transmission) gain, and sets the reception (or transmission) gain to the initial value every time a call with the communication partner terminal ends. The button telephone device according to (3) above.
(6) A gain control method for a button telephone apparatus for controlling a reception (or transmission) gain of a button telephone apparatus constituted by a button telephone main apparatus and at least one button telephone connected to the button telephone main apparatus by an extension. In
Determining whether or not there is a change in the reception (or transmission) gain of the reception (or transmission) gain control circuit for adjusting the reception (or transmission) gain provided in each of the key telephone main device and the button telephone; Storing the changed reception (or transmission) gain in a memory; determining whether or not the reception (or transmission) gain is increased; and satisfying a predetermined condition based on the determination result A gain control method for a button telephone apparatus, comprising: a step of determining whether or not, and a step of setting a reception (or transmission) execution gain according to the determination result.
(7) The gain control of the button telephone apparatus according to (6) above, further comprising a step of storing the set reception (or transmission) execution gain in the memory and using it for a subsequent call with the same call partner terminal. Method.
(8) The gain control method for a button telephone device according to (6), further including the step of setting the reception (or transmission) gain to a preset initial value at the end of a call with the communication partner terminal.
(9) Gain control of a button telephone apparatus for controlling a reception (or transmission) gain of a key telephone apparatus comprising a key telephone main apparatus and at least one button telephone each including a reception (or transmission) gain control circuit. In the method
A step of determining whether or not a user of the key telephone has operated a volume setting input circuit provided in the key telephone; and when the volume is changed by operating the volume setting input circuit, the key telephone main device and the button A gain control method for a button telephone device, comprising: changing and setting a gain of a telephone reception (or transmission) gain control circuit so that a gain change of both the gain control circuits is minimized.
(10) The gain control method for a key telephone apparatus according to (9), further comprising a step of storing the changed volume setting in a memory when there is a volume setting change by a user of the key telephone.
(11) When there is a volume setting change by the user of the key telephone, a determination is made based on two conditions depending on a setting gain of the key telephone main device and the key telephone, and the key telephone main device and the key telephone are The gain control method for a key telephone apparatus according to (9) or (10), comprising a step of setting a reception (or transmission) gain to any one of three execution settings.
(12) The two conditions are that the key telephone set gain is <0 and the key telephone main unit set gain is> 0 and the key telephone set gain is> 0 and the key telephone main unit set gain <0. (11) The gain control method of the key telephone apparatus of the above.

  According to the key telephone apparatus and the gain control method thereof of the present invention, the following remarkable effects can be obtained in practical use. That is, according to the present invention, the reception / transmission gain control circuits provided at two locations, the key telephone main unit and the key telephone, are controlled by the control device (CPU) in cooperation with each other, and each reception / transmission gain is controlled. Set the gain of the control circuit to be small. As a result, it is possible to obtain an excellent call quality (or sound quality) while suppressing unnecessary noise amplification. In addition, when the call with one call destination terminal ends, the reception / transmission gain is set to a preset initial value, so that the call with a different call destination terminal is set to an unreasonably high or low volume. It will not be done. Further, in the case of a subsequent call from the same call partner terminal that has made a call once, the optimum reception / transmission gain is set by the stored reception / transmission gain, so that the user can set the volume setting input circuit. It is possible to save the trouble of operation.

  Hereinafter, the configuration and operation of a preferred embodiment of a key telephone apparatus and its gain control method according to the present invention will be described in detail with reference to the accompanying drawings.

  First, FIG. 1 is a functional block diagram showing a configuration of a preferred embodiment of a button telephone apparatus according to the present invention. The key telephone apparatus of the present invention includes a key telephone main apparatus (ME) 10 and at least one key telephone (TEL) 20 connected to the key telephone main apparatus 10 via an extension 21.

  The key telephone main device 10 includes an external line interface 13, a 2-wire / 4-wire conversion circuit 14, a reception gain control circuit 15, a transmission gain control circuit 16, a control device (CPU) 17, a memory (storage device) 18, and an internal line interface 19. It is comprised by. Here, the external line interface 13 is connected to an exchange 32 via an external line 31, and a plurality of call destination terminals 33 are connected to the exchange 32. The external line interface 13 is connected to a 2-line / 4-line conversion circuit 14 in the key telephone main device 10, and is connected to an extension interface 19 via a reception gain control circuit 15 and a transmission gain control circuit 16. The reception gain control circuit 15 and the transmission gain control circuit 16 are connected to a control device (CPU) 17, and the reception gain and transmission gain are adjusted by the CPU 17, respectively. The CPU 17 is connected to a memory (storage device) 18 for storing data and programs, and is also connected to an extension interface 19 and an outside line interface.

  On the other hand, the key telephone 20 includes a handset input circuit 22, a handset output circuit 23, a volume setting input key 24 such as a volume key, a reception gain control circuit 25, a transmission gain control circuit 26, a control device (CPU) 27, a memory 28, An extension interface 29 is used.

  The handset input circuit 22 and the handset output circuit 23 are connected to a handset transmitter or microphone (T) 22a and a receiver or speaker (R) 23a, respectively. The handset input circuit 22 is connected to the extension interface 29 via the transmission gain control circuit 26. The extension interface 29 is connected to the handset output circuit 23 via the reception gain control circuit 25. The volume setting input circuit 24 and the memory 28 are connected to the CPU 27. The CPU 27 is connected to the extension interface 29 and also connected to the reception gain control circuit 25 and the transmission gain control circuit 26, and controls the reception gain and transmission gain, respectively. The extension interface 29 of the key telephone 20 is connected to the extension interface 19 of the key telephone main device 10 described above via the extension 21. Therefore, it should be noted that the CPU 17 of the key telephone main device 10 and the CPU 27 of the key telephone 20 are connected to each other via the extension interfaces 19 and 29 and the extension 21.

  Next, a case where the user of the key telephone 20 makes a call with the external call partner terminal 33 via the key telephone main device 10 and the exchange 32 will be described. The voice of the user of the key telephone 20 is transmitted from the handset transmitter 22a to the handset input circuit 22, the transmission gain control circuit 26, the extension interface 29, the extension 21, the extension interface 19 of the key telephone main unit 10, and the transmission gain control. The data is sent to the communication partner terminal 33 via the circuit 16, the 2-wire / 4-wire conversion circuit 14, the external line interface 13, the external line 31, and the exchange 32. On the other hand, the call voice from the call partner terminal 33, that is, the reception signal of the user of the key telephone 20, is the exchange 32, the external line 31, the external line interface 13, the 2-line / 4-line conversion circuit 14, the reception gain control circuit 15, the internal line. It is sent to the handset receiver 23 a via the interface 19, the extension 21, the extension interface 29 in the key telephone 20, the reception gain control circuit 25 and the handset output circuit 23, and is output as sound to the user's ear of the key telephone 20.

  As described above, the call signal of the user of the key telephone 20 is amplified by a gain determined by the gains of the transmission gain control circuit 26 in the key telephone 20 and the transmission gain control circuit 16 in the key telephone main device 10 to be called. It is sent to the destination terminal 33. Similarly, the voice transmitted from the call partner terminal 33 is amplified by the gains of the reception gain control circuit 15 in the key telephone main device 10 and the reception gain control circuit 25 in the key telephone 20, and the user of the key telephone 20 The voice is output from the handset receiver 23a. Here, the gains of the reception gain control circuits 15 and 25 and the transmission gain control circuits 16 and 26 are controlled by CPUs 17 and 27 provided inside the key telephone main device 10 and the key telephone 20, respectively.

  As described above, the user of the key telephone 20 operates the volume key or the like of the volume setting input circuit 24 by operating the volume key of the volume setting input circuit 24 in order to optimize the reception signals received from various call destination terminals 33. The gain of the reception signal from the other party terminal 33 is increased or decreased by controlling the gain of the reception gain control circuit 15 by the CPU 17 in the button telephone main device 10 cooperating with the CPU 27 as well as the reception gain control circuit 25 in the communication terminal. Is possible.

  Next, an example of reception gain control of the button telephone device according to the present invention will be briefly described with reference to the explanatory diagram of FIG. In FIG. 2, the reception gain of the reception gain control circuit 15 of the key telephone main device 10 is illustrated on the left side, and the reception gain of the reception gain control circuit 25 of the key telephone 20 is illustrated on the right side, before and after the volume change. ing. In this specific example, the reception gain of the key telephone main device 10 is set to -3 [dB], and the reception gain of the key telephone 20 is set to 0 [dB]. In this setting state, it is assumed that the user of the key telephone 20 feels that the received sound volume is insufficient and that the gain is increased by operating the volume setting input circuit 24 and is set to +6 [dB]. In this case, the reception gain of the key telephone main device 10 remains -3 [dB]. Accordingly, the received signal from the call destination terminal 33 is amplified with a total gain of −3 [dB] +6 [dB] = 3 [dB].

  However, according to the present invention, the key telephone main device 10 and the CPUs 17 and 27 in the key telephone 20 are linked or cooperated so that the key telephone main device 10 has the execution setting value shown in the lower column of FIG. The reception gain of the reception gain control circuit 15 and the reception gain control circuit 25 of the key telephone 20 is set. That is, the reception gain of the reception gain control circuit 15 of the key telephone main device 10 is changed from -3 [dB] to 0 [dB], and the reception gain of the reception gain control circuit 25 of the key telephone 20 is changed from 0 [dB]. Change to +3 [dB]. Therefore, the received signal from the call partner terminal 33 is the same as that described above in that it is amplified with a total gain of 0 [dB] +3 [dB] = + 3 [dB]. And the change of the reception gain of each of the key telephones 20 is minimal. However, noise generated by setting the reception gain of the reception gain control circuit 25 of the key telephone 20 to +6 [dB] as described above can be avoided, and good voice quality can be maintained.

  Next, the gain control method for the button telephone device according to the present invention will be described in detail with reference to the flowchart of FIG. First, the key telephone 20 receives a call from the call partner terminal 33. This reception is performed by connecting the communication partner terminal 33 to the key telephone 20 via the switching center 32, the external line 31, the key telephone main device 10 and the extension 21 (step S1). That is, the voice from the call destination terminal 33 is received by the exchange 32, the outside line 31, the outside line interface 13 of the key telephone main unit 10, the two-line / four-line conversion circuit 14, and the CPU 17 of the key telephone main unit 10. The signal is output from the handset receiver 23a through the gain control circuit 15, the extension interface 19, the extension 21, the extension interface 29 of the key telephone 20, the reception gain control circuit 25 and the handset output circuit 23 under the control of the CPU 27.

  Next, it is determined whether or not the above-described call is an end call (step S2). In the case of the end of the talk (step S2: Y), the gain setting values of the reception gain control circuits 15 and 25 and the transmission gain control circuits 16 and 26 are set to the execution gain (step S3). Then, call closing control is performed (step S4), and the operation is terminated (step S5).

  On the other hand, when the call is not finished, that is, when the call is continued (step S2: N), it is determined whether or not the received sound volume has been changed (step S6). If there is no change in the call volume (step S6: N), the process returns to step S2. On the other hand, when the call volume is changed (step S6: Y), the set value of the received volume is stored in the memories 18 and 28 (step S7). Next, it is determined whether or not the volume is increased (hereinafter referred to as “determination 1”) (step S8). When the volume is increased in this “determination 1” (step S8: Y), it is determined whether or not “condition 1” is satisfied (hereinafter referred to as “determination 2”) (step S9). Here, “condition 1” is the reception setting gain of the key telephone 20 <0 [dB] and the reception gain setting of the key telephone main device 10> 0 [dB].

  When “condition 1” is satisfied in the above “determination 2” (step S9: Y), 0 [dB] is the reception execution gain of the key telephone 20, the reception setting gain of the key telephone 20, and the key telephone main device 10 The reception setting gain is set as the reception execution gain (hereinafter referred to as “execution setting 1”) of the key telephone main device 10 (step S10). On the other hand, if “condition 1” is not satisfied in the above “determination 2” (step S9: N), it is determined whether or not “condition 2” is satisfied (hereinafter referred to as “determination 3”) (step S11). . Here, “condition 2” is that the reception setting gain of the key telephone 20> 0 and the reception setting gain of the key telephone main device 10 <0. Further, even when the volume is not increased in the “determination 1” (step S8: N), it is determined whether or not “condition 1” is satisfied (hereinafter referred to as “determination 4”) (step S12). When “condition 2” is satisfied in “judgment 3” in step S11 (step S11: Y) and when “condition 1” is satisfied in “judgment 4” in step S12 (step S12: Y), 0 [dB] is the reception execution gain of the key telephone main device 10, and the reception setting gain of the key telephone 20 + the reception setting gain of the key telephone main device 10 is the reception execution gain of the key telephone 20 (hereinafter referred to as "execution setting 2"). ) (Step S13).

  On the other hand, if “condition 1” is not satisfied in the above “determination 4” (step S12: N), it is determined whether or not “condition 2” is satisfied (hereinafter referred to as “determination 5”) (step 5). S14). If “condition 2” is not satisfied in “judgment 5” (step S14: N) or if “condition 2” is not satisfied in “judgment 3” (step S11: N), the reception setting of the key telephone 20 is set. The gain is the execution gain of the key telephone 20, and the reception setting gain of the key telephone main device 10 is the reception setting gain of the key telephone main device 10, that is, no change (hereinafter referred to as “execution setting 3”) (step S15). . If “condition 2” is satisfied in “judgment 5” (step S14: Y), the above-described “execution setting 1” is set (step S10). And after these step S10, S13, or step S15, it returns to step S2 mentioned above, and determines an end story.

  As described above, when the reception volume is changed by the user of the key telephone 20, the condition of “Judgment 2” in FIG. 3 is not met (N), but the condition of “Judgment 3” is met. (Y), the execution setting values shown in FIG. 2 (in this case, the reception gain of the key telephone main device 10 is 0 [dB] and the reception gain of the key telephone 20 is +3 [dB]) are each reception gain control circuit. Set to 15 and 25 and hold until the volume changes or the call ends. As a result, useless noise amplification is suppressed, and it is possible to obtain better call quality compared to normal processing. It should be noted that at the end of the call, setting the normal set value to each of the reception gain control circuits 15 and 25 does not affect the volume in the next call.

  As described above, when the reception gain control circuits 15 and 25 (or the transmission gain control circuits 16 and 26) are provided at a plurality of locations such as the key telephone main device 10 and the key telephone 20, the plurality of gain controls. In consideration of circuit settings, the execution gain is determined so that the gain change of each gain control unit is minimized. Therefore, it is possible to reduce noise and maintain good reception or transmission sound quality.

  The preferred embodiments of the key telephone apparatus and the gain control method thereof according to the present invention have been described above in detail. However, it should be noted that such examples are merely illustrative of the invention and do not limit the invention in any way. Those skilled in the art will readily understand that various modifications and changes can be made according to a specific application without departing from the gist or spirit of the present invention.

  For example, in the above-described preferred embodiment, the case where the call destination terminal is an external line has been described. However, the call destination terminal is not limited to an external line, and the same effect can be obtained with an internal line. Moreover, although the above-mentioned detailed description demonstrated the control regarding reception of an outside line call, the effect similar to the case of reception is acquired by the same method also regarding control regarding transmission gain. Furthermore, in the above description, the case where there are two gain control circuits on the key telephone main device side and the key telephone side has been described, but even when there are three or more gain control circuits inserted into the speech path. Similar effects can be obtained by the same method.

It is a functional block diagram which shows the structure of the preferred Example of the button telephone apparatus by this invention. It is a figure explaining the example of a receiving gain setting value in the key telephone apparatus by this invention. 3 is a flowchart showing a gain control method for a button telephone device according to the present invention. It is explanatory drawing of gain control in the conventional button telephone apparatus.

Explanation of symbols

10 button telephone main unit (ME)
15, 25 Reception gain control circuit 16, 26 Transmission gain control circuit 17, 27 Control device (CPU)
18, 28 Memory 20 Button Telephone (TEL)
21 extension 24 volume setting input circuit 31 outside line 32 switching center 33 destination terminal

Claims (12)

In a key telephone apparatus comprising a key telephone main device and at least one key telephone connected to the key telephone main device by an extension,
A reception (or transmission) gain control circuit for controlling a gain of a reception (or transmission) signal provided in each of the key telephone main unit and the key telephone is set in a volume setting input circuit provided in the key telephone. And a control device for controlling the gains of the reception (or transmission) gain control circuits of the key telephone main device and the key telephone in cooperation with each other.   The control device determines a reception (or transmission) execution gain of the key telephone main device and the key telephone based on a setting gain of the reception (or transmission) setting gain control circuit of the key telephone main device and the key telephone. The button telephone apparatus according to claim 1, wherein:   The key telephone apparatus according to claim 1 or 2, wherein each of the key telephone main apparatus and the key telephone includes a memory and stores a set value of the set reception (or transmission) gain.   At the next call from the same call partner terminal, the reception (or transmission) gain setting value stored in the memory is set to the reception (or transmission) gain control circuit of the key telephone main device and the key telephone. 4. The key telephone apparatus according to claim 3, wherein a reception (or transmission) gain is set.   Each of the memories stores an initial value of the reception (or transmission) gain, and sets the reception (or transmission) gain to the initial value every time a call with the communication partner terminal ends. The key telephone apparatus according to claim 3, wherein In a gain control method for a button telephone apparatus for controlling a reception (or transmission) gain of a button telephone apparatus constituted by a button telephone main apparatus and at least one button telephone connected to the button telephone main apparatus by an extension,
Determining whether or not there is a change in the reception (or transmission) gain of the reception (or transmission) gain control circuit for adjusting the reception (or transmission) gain provided in each of the key telephone main device and the button telephone; Storing the changed reception (or transmission) gain in a memory; determining whether or not the reception (or transmission) gain is increased; and satisfying a predetermined condition based on the determination result A gain control method for a button telephone device, comprising: determining whether or not, and setting a reception (or transmission) execution gain according to the determination result.   7. The button telephone apparatus according to claim 6, further comprising a step of storing the set reception (or transmission) execution gain in the memory and using it for a subsequent call with the same call destination terminal. Gain control method.   7. The gain control method for a button telephone apparatus according to claim 6, further comprising a step of setting the reception (or transmission) gain to a preset initial value at the end of a call with a communication partner terminal. . In a gain control method for a button telephone apparatus that controls a reception (or transmission) gain of a key telephone apparatus including a key telephone apparatus including a reception (or transmission) gain control circuit and at least one button telephone,
A step of determining whether or not a user of the key telephone has operated a volume setting input circuit provided in the key telephone; and when the volume is changed by operating the volume setting input circuit, the key telephone main device and the button A gain control method for a button telephone device, comprising: changing and setting a gain of a telephone reception (or transmission) gain control circuit so that a gain change of both the gain control circuits is minimized.   10. The gain control method for a key telephone apparatus according to claim 9, further comprising a step of storing the changed volume setting in a memory when there is a volume setting change by a user of the key telephone.   When there is a volume setting change by the user of the key telephone, a determination is made based on two conditions depending on a setting gain of the key telephone main device and the key telephone, and reception of the key telephone main device and the key telephone (or The method for controlling the gain of a key telephone apparatus according to claim 9 or 10, further comprising a step of setting the gain to one of three execution settings.   The two conditions are that the key telephone set gain is <0, the key telephone main unit set gain is> 0, and the key telephone set gain is> 0 and the key telephone main unit set gain <0. The gain control method of the button telephone apparatus of Claim 11 characterized by these.

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