JP4670701B2 - Intercom equipment - Google Patents

Description

  The present invention relates to an improvement of an interphone device in an interphone system configured by connecting a doorphone slave unit having a call switch to an interphone device having a speaker and a microphone and adding a wireless response switch.

  This type of intercom system responds to calls from doorphone sub-units even for children who are out of reach or elderly people who are difficult to get up from a chair to interphone devices (master units) installed on the wall. A wireless response switch such as a remote control is provided.

  As such an intercom system, the following patent document describes that the start and end of a hands-free call can be controlled by an infrared remote control signal, so that a response and a call can be made to a doorphone slave unit from a place away from the base unit. An intercom device is disclosed.

The intercom apparatus of this patent document includes a call control unit that controls a hands-free call, and an infrared signal that receives a control signal instructing the start and end of a hands-free call transmitted by an infrared remote control transmitter and inputs the control signal to the call control unit A receiving unit is provided in the base unit.
Japanese Patent Laid-Open No. 06-133064

  However, in the interphone device as described above, since the remote control is not equipped with a calling means such as a microphone and a speaker for cost reduction, even if a response operation can be performed with the wireless response switch, a call cannot be made. In order to make a call, there is a problem that the speaker must approach the base unit and make a call through the microphone and speaker. In other words, if this intercom device is designed for a speaker at a short distance, the voice from the doorphone slave unit that can be heard from the speaker of the master unit is reduced for a speaker at a long distance from the master unit. Furthermore, in the parent device employing the voice switch, there is a problem that the voice of the speaker collected by the microphone of the parent device is reduced, so that the voice is difficult to be transmitted. Such a problem is not only that the base unit can start a call with the doorphone slave unit by wirelessly responding to the wireless response switch of the remote control, but also if the call response switch on the surface of the base unit housing is pressed, It becomes a significant problem when making it possible to start a call.

  The present invention solves such a problem, and when the distance between the interphone device (master unit) and the speaker is short, it corresponds to both the case where the interphone device is far and the case where it is far. The object is to provide an intercom device that can reliably secure the call volume.

In order to solve the above-mentioned problem, according to claim 1, an intercom configured by connecting a doorphone handset having a call switch to a hands-free intercom device having a speaker and a microphone and adding a wireless response switch In the system,
A call switch,
Wireless receiving means for receiving a response signal from the wireless response switch;
A voice switch that selectively allows passage of both signals by performing insertion loss between the transmission voice signal input through the microphone and the reception voice signal input from the door phone handset side;
When the answer operation by the call switch is accepted, the loss ratio of the short distance call mode is selected, while when the answer operation by the wireless answer switch is accepted, the loss ratio of the long distance call mode is selected and inserted by the voice switch. A call control means for identifying the loss,
The loss ratio in the short-distance call mode is such that the voice switch performs the transmission voice signal and the reception voice signal under the initial state where both the level of the transmission voice signal and the level of the reception voice signal are equal to or less than a predetermined value. Is initially set to a value that allows the voice switch to pass evenly, and the loss ratio in the long-distance call mode is initially set to a value that allows the voice switch to pass the transmission voice signal preferentially under the initial state. .

In claim 2, in claim 1,
A reception voice indoor side amplifying means capable of changing a first gain that is an amplification gain of a reception voice signal that passes through the voice switch and is input to the speaker;
Further comprising: a transmission voice indoor side amplifying means capable of changing a second gain which is an amplification gain of a transmission voice signal inputted to the voice switch through the microphone;
The call control means sets the first gain and the second gain to respective predetermined reference values when selecting the loss ratio of the short distance call mode, while selecting the loss ratio of the long distance call mode. The first gain is set higher than a predetermined reference value in the short distance call mode, and the second gain is set lower than a predetermined reference value in the short distance call mode.

In claim 3, in claim 2,
Transmission voice handset side amplifying means that can change a third gain that is an amplification gain of the transmission voice signal that passes through the voice switch and is output to the intercom handset,
A receiving voice slave unit side amplifying means capable of changing a fourth gain, which is an amplification gain of the received voice signal inputted from the door phone slave unit to the voice switch,
The call control means sets the third gain and the fourth gain to respective predetermined reference values when the loss ratio of the short distance call mode is selected, while selects the loss ratio of the long distance call mode. The third gain is set higher than a predetermined reference value in the short-distance call mode, and the fourth gain is set lower than a predetermined reference value in the short-distance call mode.
Further, in claim 4, in claims 1 to 3,
When the call control means detects that a predetermined operation input has been made to the call switch, the call control means subsequently shifts the voice switch to the background noise setting mode for a predetermined length of time, and the voice is switched in the background noise setting mode. The maximum value of the sum of the transmission voice signal level from the microphone observed by the switch and the reception voice signal level transmitted from the door phone slave unit is stored in the voice switch as the predetermined value giving the initial state. Is,
When the background noise setting mode is automatically canceled after a predetermined length of time has elapsed, the voice switch determines whether or not the initial state is in accordance with the predetermined value in the immediately preceding background noise setting mode. To do.

  In the interphone device according to claims 1 to 3, when the wireless response switch responds, the insertion loss added by the voice switch is specified based on the loss ratio of the long-distance communication mode, and the loss ratio is determined by the transmission of the speech such as the silence state. When the level of the audio signal and the level of the received voice are both equal to or less than the predetermined value, the transmission voice signal is set to a value that is given priority over the received voice signal. The input noise and the like are blocked, and the voice of the speaker at a distance away from the interphone device can be reliably transmitted to the door phone handset, thereby improving the call quality.

  According to a second aspect of the present invention, when the loss ratio of the long distance communication mode is selected, the reception voice signal input to the speaker from the door phone sub-unit is set to a predetermined gain in the short distance communication mode by the reception voice indoor side amplification means. Is set to a value larger than the reference value, so that the voice of the visitor input from the door phone slave unit is increased, and thus the voice can be sufficiently heard even by a speaker at a distance away from the interphone device.

At this time, the second gain of the transmission voice output from the microphone and input to the voice switch is set to a value lower than a predetermined reference value in the short distance communication mode by the transmission voice indoor side amplification means. Therefore, since the transmitted voice signal entering the microphone from the speaker is input to the voice switch with a high level and compared with the received voice signal, the voice switch blocks the passage of the received voice signal (so-called blocking phenomenon) ) Does not occur, and it is possible to prevent deterioration of the call quality due to the sound wrapping around from the speaker to the microphone in such an indoor intercom device.

  Further, in the third aspect, when the loss ratio of the long distance communication mode is selected, the third gain of the transmission voice signal that passes through the voice switch and is output to the intercom terminal is amplified by the transmission voice terminal side amplification. Since the means is set to a value higher than a predetermined reference value in the short-distance call mode, the voice of the speaker at a distance away from the interphone device is also amplified, making it easy to hear even on the doorphone handset side.

At this time, the fourth gain of the received voice signal input from the microphone of the door phone slave unit and input to the voice switch is greater than a predetermined reference value in the short distance call mode by the receiver voice slave unit loss means. Since the received voice signal is input to the voice switch with a high level and compared with the transmitted voice signal, the voice switch does not block the transmission voice. Further, it is possible to prevent deterioration of the call quality due to the sound wrapping around from the speaker to the microphone in the door phone unit at such an entrance.
Furthermore, according to claim 4, the voice switch regards the predetermined value measured in the immediately preceding background noise setting mode as a threshold value for discriminating whether only background noise or voice is inputted, and is in an initial state, that is, non- It is possible to determine whether or not the call is in progress. In other words, an excellent interphone system that can learn the threshold of background noise according to the construction location of the interphone system according to the present invention and that does not misrecognize that it is a call voice when there is only background noise is provided. it can.

Embodiments of the present invention will be described below with reference to the drawings.
In the following embodiments, the intercom system is composed of an interphone device (master unit) and a door phone slave unit, but is composed of a plurality of door phone slave units and a plurality of interphone devices (master unit, sub master unit). May be.

  FIG. 1 is a block diagram illustrating a schematic configuration of an interphone system S including an interphone device 1 according to the present invention, and omits components not related to the present invention.

  Here, 1 is an interphone device installed indoors, etc., 2 is a door phone slave installed at a front door or the like connected to the interphone device 1 via a cable L such as a two-wire type. The intercom device 1 and the door phone slave unit 2 are connected via a two-wire cable L. In addition to the driving power supplied from the interphone device 1 to the door phone slave unit 2, frequency signals such as voice signals and call signals are multiplexed and transmitted / received. ing.

  The intercom device 1 is specified by the speaker SP and the microphone MC, the reception voice indoor side amplifying means 11, the call switch 13 operated to respond to the call from the door phone slave unit 2, the wireless receiving means 14, and the call control means 16. A voice switch that adds the initial value of the insertion loss to the transmission voice signal and the reception voice signal, and thereafter appropriately inserts the transmission loss and the reception voice signal independently unless the insertion control unit 16 resets the insertion loss. 15, a call control means 16 for selecting a loss ratio and specifying an insertion loss, a transmission voice handset side amplification means 17, a transmission voice indoor side amplification means 18, and a reception voice handset side amplification means 19; The wireless receiving means 14 receives an operation signal transmitted by infrared or radio from a wireless controller RC provided with a wireless response switch 14a. That.

  The voice switch 15 is set with a transmission side insertion loss amount and a reception side insertion loss amount from a later-described call control means 16, and appropriately inserts loss into both the transmission voice and the reception voice. The voice switch 15 performs alternative passage control of transmission and reception independently until the insertion loss amount is set by the call control means 16, and the call control means 16 performs the call switch 13. And the wireless receiving means 14 each time an input is detected, the call control means 16 sets the insertion loss amount, that is, the short distance call mode or the long distance call mode.

  When the call control means 16 responds to the call from the intercom unit 2 with the call switch 13, the call control means 16 selects the loss ratio of the short distance call mode, while when it responds with the wireless response switch 14 a, The loss ratio of the long-distance call mode is selected and the insertion loss due to the voice switch 15 is specified. The voice switch 15 is set to either the short-distance call mode or the long-distance call mode. Determines the insertion loss characteristics to be applied when performing alternative passage control between transmission and reception.

This insertion loss characteristic will be described below with reference to FIGS. Conventionally, the voice switch 15 is represented by a functional block configuration as shown in FIG. 2, and the voice switch 15 plays a role of causing a signal loss and attenuating the voice signal that flows from the doorphone slave unit 2 and is sounded by the speaker SP. An attenuator block RXATT, a transmission attenuator block TXATT that plays a role of attenuating and attenuating a signal transmitted to the intercom unit 2 by the microphone MC, and a received voice signal Rin immediately before input to the reception attenuator block RXATT. The transmission attenuator block TXATT or the reception attenuator block RXATT is compared with the transmission voice signal Tin immediately before the input to the transmission attenuator block TXATT and the volume of the transmission voice signal Tin and the reception voice signal Rin is smaller. Increase the amount of signal loss inserted into It is constituted by the loss controller. In the present invention, the reception voice handset side amplifying means 19 is connected to the doorphone handset 2 side (Rin) of the reception attenuator block RXATT, and the reception sound room interior side to the speaker SP side (Rout) of the reception attenuator block RXATT. Amplifying means 11 is connected, and further, a transmitting voice handset side amplifying means 17 is connected to the doorphone handset 2 side (Tout) of the transmitting attenuator block TXATT, and a microphone MC of the transmitting attenuator block TXATT. On the side (Tin), the transmission voice indoor side amplifying means 18 is connected.
Conventionally, as shown in FIG. 3, such a voice switch 15 is designed so that the signal loss amount to be inserted into the transmission attenuator block TXATT has a downward-sloping characteristic, and the sum thereof is a constant value. It is designed so that the signal loss amount inserted into the reception attenuator block RXATT has an upward characteristic. In the graph of FIG. 2, the vertical axis represents the amount of signal loss inserted into each of the transmission attenuator block TXATT and the reception attenuator block RXATT, and increases from zero (decibel) to L (decibel) (lower part of FIG. 3). As the signal loss amount increases, the attenuation of the audio signal increases. Further, the standby state represented by (0) in the center of the graph at the time of non-calling (this is called an initial state) is set, and the amount of signal loss inserted into each of the transmission attenuator block TXATT and the reception attenuator block RXATT is Equally set to L / 2 (decibel).
Starting from this initial state (0), when an audio signal (received signal) arrives from the side of the doorphone slave unit 2, an L (decibel) signal loss amount is inserted into the transmission attenuator block TXATT and the room sound from the microphone MC Is suppressed by the transmission attenuator block TXATT, and at the same time, the signal loss amount is raised to zero (decibel) in the reception attenuator block RXATT, and the reception voice to the speaker SP is not suppressed and the speaker SP sounds ( State (1) in FIG.
In addition, when the room voice (transmission signal) is input to the microphone MC starting from the initial state (0), a signal loss amount of L (decibel) is inserted into the reception attenuator block RXATT and from the side of the doorphone slave unit 2 Is suppressed by the reception attenuator block RXATT, and at the same time, the signal loss amount is raised to zero (decibel) in the transmission attenuator block TXATT, and the transmission signal from the microphone MC is not suppressed, and the door phone 2 side (State (2) in FIG. 3).
Note that the initial state (0) is the starting point, and the state is not directly changed to the state (1) or (2) in FIG. 3, but the signal loss amount of the transmission attenuator block TXATT and the reception attenuator in the graph of FIG. The sum of the block RXATT and the signal loss amount always keeps a constant value L (decibel), and transitions in an analog manner.
In the present invention, when the call control means 16 further detects that a predetermined operation input has been made to the call switch 13, the voice switch 15 is subsequently shifted to the background noise setting mode for a predetermined time length. The initial state (0) is given as the maximum value of the sum of the transmitted voice signal level from the microphone MC observed by the voice switch 15 and the received voice signal level transmitted from the doorphone slave unit 2 in the noise setting mode. The voice switch 15 stores the predetermined value. The predetermined value giving the initial state (0) is the allowable range of background noise, as shown in FIG. 4, and is the maximum value of the allowable range of background noise. With this as a threshold, the voice switch 15 of the present invention starts an analog state transition from the initial state (0) to the state (1) or (2) in FIG. Therefore, it is necessary to shift to the background noise setting mode in a state where there are no visitors and the room is in a normal quiet state.
When a predetermined time length has elapsed from the start of the background noise setting mode, the call control means 16 releases the voice switch 15 from the background noise setting mode, and the voice switch 15 has the predetermined value in the immediately preceding background noise setting mode and It is determined whether or not an initial state is reached. That is, as shown in FIG. 4, when the visitor presses the call button of the door phone child unit 2 and says "I'm sorry", the volume of this "I'm sorry" exceeds the predetermined value, and the initial state (0 ) To state (1) to enter the receiving state. When the visitor finishes saying "I'm sorry", only background noise remains, so the volume does not exceed the specified value and the state transitions from the state (1) to the initial state (0) in Fig. 3, and the inhabitant should respond. When you press the call switch 13 and say "Where are you?", The volume of "Where are you?" Exceeds the specified value, and the state transitions from the initial state (0) to the state (2) in FIG. , It becomes a receiving state. When the visitor finishes saying “Where are you?”, Since only background noise remains, the volume does not exceed the predetermined value, and the state transitions from the state (2) in FIG. 3 to the initial state (0). In this way, the one-way audio transmission is continued by the seesaw method, so that a call between the visitor and the room becomes possible.
In this manner, in the insertion loss characteristic for the short-distance call mode, the amount of insertion loss of the voice switch 15 with respect to both the level of the transmitted voice signal and the level of the received voice signal is less than a predetermined value. The loss ratio is set to be almost the same. This is based on the assumption that a speaker at a short distance, for example, a distance of about 50 cm, from the interphone device 1 talks with a speaker on the doorphone slave unit 2 side. It is assumed that the sound signal and the received voice signal that enters the speaker SP of the intercom device 1 from the door phone slave 2 side have substantially the same signal level. Note that the loss ratio of the voice switch in the conventional hands-free intercom system is set to be almost the same.

  In contrast, in the insertion loss characteristic for the long-distance communication mode, the amount of insertion loss of the received voice signal is smaller than the predetermined value when both the level of the transmitted voice signal and the level of the received voice signal are less than a predetermined value. The loss ratio is set to be sufficiently larger than the insertion loss amount of the speech voice signal. This is based on the assumption that a speaker at a long distance, for example, about 2 m, from the interphone master unit 1 talks with a speaker on the door phone slave unit 2 side, and is transmitted from the microphone MC to the door phone slave unit 2 side. It is assumed that the transmitted voice signal has a lower signal level than the received voice signal transmitted from the doorphone slave unit 2 to the speaker SP.

  As can be understood from the above, in the present invention, when the wireless response switch 14a is operated at a distance from the intercom device 1, the voice switch 15 uses the insertion loss characteristic for the long distance communication mode. Therefore, even when the voice level input from the microphone MC of the intercom device 1 is low, the reception from the doorphone slave unit 2 and the noise sound are suppressed, and the voice of the speaker is sufficiently confirmed also on the doorphone slave unit 2 side. It is possible to make a sufficient hands-free call with the doorphone child unit 2 even from a distance.

  FIG. 5A is an insertion loss characteristic diagram for the short distance communication mode as shown in FIG. 3, and FIG. 5B is an insertion loss ratio characteristic diagram for the long distance communication mode, which is a feature of the present invention. In any case, the insertion loss is changed from 0 dB to + L dB.

  In the insertion loss characteristic for the short-distance call mode shown in FIG. 5A, both the received voice signal level and the transmitted voice signal level are equal to or less than a predetermined value in the standby state before the start of the call or during the call. In some cases, the loss ratio is set so that the insertion loss of both the received voice signal and the transmitted voice signal is the same.

  On the other hand, in the long-distance call mode insertion loss characteristic shown in FIG. 5B, in the standby state, the insertion loss of the transmission voice signal is minimized and the insertion loss of the transmission voice signal is maximized. Thus, the loss ratio is set so that the voice switch 15 suppresses the transmission voice signal and preferentially passes the reception voice signal in the standby state.

  In addition, in the system of the present invention, in order to execute the long-distance call mode, in addition to the selection of the loss ratio described above, in order to perform a hands-free call at a position away from the interphone device 1 without any trouble, it is amplified and amplified. A reception voice indoor side amplification means 11, a transmission voice handset side amplification means 17, a transmission voice indoor side amplification means 18 and a reception voice handset side amplification means 19 are provided which can set the gain variably. Note that the signal lines X and Y in FIG. 1 transmit the audio signal and communicate with the door phone sub-unit 2 side via a 2 / 4-line transmission method conversion means (not shown).

  Here, the received voice indoor side amplifying means 11, the transmitted voice slave unit amplifying means 17, the transmitted voice indoor side amplifying means 18, and the received voice loss means 19 amplify the transmitted voice signal and the received voice signal, or The transmission voice signal attenuated by the transmission voice indoor side amplification means 18 and the reception voice signal attenuated by the reception voice handset side amplification means 19 are being communicated by the voice switch 15. Compared to

  Next, the basic operation of the system of the present invention will be described. When the intercom device 1 receives a call from the door phone slave unit 2, a ringing tone is sounded. On the other hand, in the intercom device 1, when the call switch 13 is operated and responded, an alternate call with the door phone slave unit 2 is possible for a predetermined time through the microphone MC and the speaker SP. Then, when the wireless response switch 14a of the wireless controller RC is operated and responded, the telephone conversation with the door phone slave unit 2 can be performed for a predetermined time through the microphone MC and the speaker SP at that place.

  Here, when the call switch 13 is operated, the call control means 16 selects the loss ratio of the short-distance call mode described above and sets the voice switch 15 to the short-distance call mode. An amplification gain of a predetermined reference value is set for the inner amplifying means 18 and the reception voice handset side amplifying means 19.

Thereby, the voice switch 15 compares the level of the transmitted voice signal and the level of the received voice signal after being attenuated by the transmission voice indoor side amplification means 18 and the reception voice slave side amplification means 19.
As a result of the comparison, in the voice switch 15, when both the level of the transmission voice signal and the level of the reception voice signal are below a predetermined value, or in the standby state where both are silent, Since the loss ratio is set so that both of the audio signals have the same insertion loss, the same level of insertion loss is added to both the transmission voice signal and the reception voice signal.

  As a result of the comparison, if the level of the transmitted voice signal is higher than the level of the received voice signal, a loss ratio is set so that the transmitted voice signal is not lost and the received voice signal is greatly lost. As a result, the transmission state in which the transmission voice signal is allowed to pass and the reception voice signal is suppressed from passing is obtained.

  Conversely, if the result of the comparison shows that the level of the transmitted voice signal is lower than the level of the received voice signal, a loss ratio is set so that the transmitted voice signal is largely lost and the received voice signal is not lost. Therefore, the passage of the transmission voice signal is suppressed, and a reception state in which the passage of the reception voice signal is allowed is obtained.

  On the other hand, when the wireless response switch 14a of the wireless controller RC is operated, the call control means 16 selects the loss ratio of the above-mentioned long distance call mode and sets the voice switch 15 to the long distance call mode. The reception voice handset side amplifying means 19 sets a sufficiently larger amplification gain than the transmission voice room inside amplification means 18 for the transmission voice room inside amplification means 18 and the reception voice handset side amplification means 19.

As a result, the voice switch 15 compares the levels of the transmission voice signal and the reception voice signal after loss has been caused by the transmission voice indoor side amplification means 18 and the reception voice slave side amplification means 19. Thereby, even when the level of the transmitted voice signal is lower than the level of the received voice signal, the situation where the transmitted voice signal is called and the received voice signal is blocked is eliminated.
As a result of the comparison, in the voice switch 15, when the level of the transmission voice signal and the level of the reception voice signal are only background noise and do not satisfy the predetermined value, the transmission voice signal is changed to the reception voice signal. The loss ratio is set so that priority is given to the voice signal, that is, the transmitted voice signal is not lost, and the received voice signal is largely lost.

  As a result, passage of the transmitted voice signal is allowed and passage of the received voice signal is suppressed, so that noise noise on the side of the doorphone slave unit 2 and a long distance input from the microphone MC of the base unit 1 Even if the speaker's voice is in the same level, the voice of the speaker on the base unit 1 side can be reliably transmitted to the doorphone slave unit 2 as a transmission voice signal.

  As a result of comparison, when the level of the transmitted voice signal is higher than the level of the received voice signal, or conversely, when the level of the transmitted voice signal is lower than the level of the received voice signal, Since it is the same as that, its description is omitted.

  Next, volume setting in the short distance call mode and the long distance call mode will be described. In the long distance communication mode, the volume setting is such that the received voice output from the speaker SP of the interphone device 1 is reduced for a speaker who is far away from the interphone device 1, and the microphone of the interphone device 1 is from the speaker. Considering the situation that the transmitted voice input through the MC is also reduced, the received voice room inner side amplifying means 11, the transmitted voice handset side amplifying means 17, the transmitted voice room inner side amplifying means 18, and the received voice handset side amplified. The amplification amplification gain of the means 19 is changed and set between the short distance call mode and the long distance call mode.

  That is, when executing the short-distance call mode, the call control means 16 uses the first gain, which is an amplification gain that is a normal reference value for the reception amplification means 11, as a transmission voice indoor amplification means. On the other hand, a second gain, which is an amplification gain that is a normal reference value, is set for 18, while when executing the long-distance call mode, the first gain is set from a predetermined reference value in the short-distance call mode. And the second gain is set lower than a predetermined reference value in the short distance communication mode.

  As a result, during execution of the long-distance call mode, the received voice uttered from the speaker 11 is increased to make it easier for the speaker on the intercom device 1 side to hear, and the received voice is directly captured by the microphone MC. As a result of comparing the received voice signal with the received voice signal as the transmitted voice signal, the voice switch 15 is prevented from operating such as blocking the received voice signal by the voice switch 15 and passing the transmitted voice signal.

  Further, when executing the short-distance call mode, the call control means 16 gives the transmission voice handset side amplifying means 17 a third gain, which is an amplification gain that is a normal reference value, on the reception voice handset side. The amplification means 19 is set with a fourth gain, which is an amplification gain that is a normal reference value. On the other hand, when executing the long-distance call mode, the third gain is set from the predetermined reference value in the short-distance call mode. And the fourth gain is made lower than a predetermined reference value in the short distance communication mode.

  Thus, during execution of the long-distance call mode, the transmission voice signal is transmitted from the speaker on the intercom device 1 side and captured by the microphone MC (smaller than the short-distance call mode). Amplifying by the side amplifying means 17 and making it easy to hear on the side of the doorphone slave unit 2, the transmitted voice is captured by a microphone (not shown) of the doorphone slave unit 2 and compared with the transmitted voice signal as a received voice signal As a result, an unstable operation of the voice switch 15 such as blocking the transmission voice signal by the voice switch 15 and passing the reception voice signal is prevented in advance.

  FIG. 6 shows an example of the volume setting set in the reception voice indoor side amplification means 11, the transmission voice handset side amplification means 17, the transmission voice indoor side amplification means 18, and the reception voice loss means 19. This is shown as the difference between the gain and loss of the long-distance communication mode with respect to the mode.

  That is, in the long-distance communication mode, the reception voice indoor amplification unit 11 is + AdB, the transmission voice amplification unit 17 is -AdB, the transmission voice indoor amplification unit 18 is -AdB, and the reception voice slave unit amplification unit 19 is further. Only (− (A + B) dB) is a set value that is increased or decreased from a predetermined reference value in the short distance communication mode. Here, the setting value of the reception voice handset side amplifying means 19 is-(A + B) dB. In the long-distance call mode, the sound is uttered by the speaker on the base unit 1 side and is captured by the microphone MC. This is to compensate for the attenuation due to the distance of the transmitted voice signal, but these setting values are optimal for both short-distance call mode and long-distance call mode considering the actual system. Needless to say, it is set to a value.

  FIG. 7 is a block diagram illustrating a more specific configuration of the intercom system S including the intercom device 1 according to the present invention. This intercom system S is an example of an interphone system that includes a plurality of doorphone slave units 2 (# 1) to 2 (# 3) and a plurality of interphone devices (master unit 1, sub-master unit 3). In the figure, the same reference numerals are given to components common to or corresponding to those of the first embodiment.

  The base unit 1 is composed of a microcomputer or the like, and includes a call control unit 16 that controls other components, a speaker SP and a microphone MC, a display unit DISP, a reception voice indoor side amplifying unit 11, and a door phone sub unit 2 (# 1) to Call switch 13 operated to respond to the call from 2 (# 3), wireless reception means 14, voice switch circuits 15a and 15a for adding insertion loss to each of the transmission voice signal and the reception voice signal, transmission Insertion loss applied to each of the voice switch circuits 15a and 15a based on the selection of the short-distance call mode and the long-distance call mode performed by the call control means 16 by measuring and comparing the voice signal and the received voice signal. The voice switch control unit 15b for appropriately determining the amount, the transmission voice handset side amplification means 17, the transmission voice room side amplification means 18, the reception voice handset side amplification means 19, 2/4 wire transmission System conversion means 111, received voice auxiliary amplifying means 112, transmitted voice auxiliary amplifying means 113, speech path switching means 114 for selecting any one of door phone sub-units 2 (# 1) to 2 (# 3), door phone sub-unit 2 Control signal receiving means 115 for receiving a control signal such as a call from (# 1) to 2 (# 3), any one of door phone slave units 2 (# 1) to 2 (# 3), or interphone sub-master unit 3 Control signal transmission / reception means 116 for transmitting / receiving control signals to / from the terminals, handset connection terminals TA # 1 to TA # 3 corresponding to the doorphone handsets 2 (# 1) to 2 (# 3), and the interphone sub-master 3 The wireless receiving means 14 receives an operation signal transmitted by infrared rays, radio waves, or the like from the wireless operation device RC provided with the wireless response switch 14a.

  The voice switches 15a and 15a, the voice switch control unit 15b, the transmitted voice loss means 18, and the received voice slave side amplification means 19 are integrated as a voice switch integrated circuit 15.

The call control means 16 selects the loss ratio in the short-distance call mode when responding with the call switch 13 to calls from the intercom handsets 2 (# 1) to 2 (# 3). When the response switch 14a responds, the loss ratio of the long-distance call mode is selected to identify the insertion loss due to the voice switch 15, and the voice switch control unit 15b is switched to the short-distance call mode or the long-distance call mode. Set.

  The intercom 2 (# 1) includes a speaker SP2 and a microphone MC2, a call switch 21, a handset controller 22, a handset control signal receiving means 23, a handset reception voice indoor amplification means 24, and a handset transmission signal amplification. Means 25 and slave unit 2/4 line transmission system conversion means 26.

  Since the secondary master unit 3 has substantially the same configuration and function as the master unit 1, its description is omitted.

  The basic operation of the intercom system S is as follows. That is, when the call switch 21 is operated in any of the doorphone sub-units 2 (# 1) to 2 (# 3), the ringing sound such as ping-pong is transmitted from the speaker SP in both the main unit 1 and the sub-base unit 3. Is output. When the call switch 13 or the wireless response switch 14a is operated on the base unit 1, the call control means 16 starts the short-distance call mode or the long-distance call mode described above accordingly, The amplification gain (amplification gain) and loss gain of the reception amplification means 11, transmission voice amplification means 17, transmission voice indoor side amplification means 18, and reception voice slave side amplification means 19 are set according to the mode.

  After that, during the execution of the short-distance call mode or the long-distance call mode, the voice switch control unit 15b sequentially compares the level of the transmitted voice signal and the level of the received voice signal, and the voice based on the comparison result. The amount of insertion loss by the switches 15a and 15a is specified. Thereby, the telephone call between the base unit 1 and the intercom 2 can be performed for a predetermined time. On the other hand, interphone sub-master 3 is in a state of being cut off from a call at that time. The same applies to the case where the call switch 13 or the wireless response switch 14a (not shown) is operated on the interphone sub-master 3 instead of the interphone master 1.

  8 and 9 are time charts for explaining the operation of each component in the intercom system S in the short distance call mode or the long distance call mode according to time.

  In the above description, the combination for gain control is the combination of the amplification means indicated by reference numerals 11 and 17, but is not limited to this, and may be a combination of the amplification means indicated by reference numerals 112 and 113.

The block diagram explaining schematic structure of the intercom apparatus of this invention. The block diagram explaining the audio | voice switch of the conventional and intercom apparatus of this invention. The characteristic view explaining the relationship between the voice loss insertion of the voice switch same as the above, and the state transition. The characteristic view explaining the threshold value which disregards the background noise of the voice switch of this invention. (A) is an insertion loss characteristic diagram for short-distance call mode, (b) is an insertion loss ratio characteristic diagram for long-distance call mode. 6 is a diagram for explaining an example of amplification gains and amplification gains set in the reception voice indoor side amplification means, the transmission voice handset side amplification means, the transmission voice indoor side amplification means, and the reception voice loss means; FIG. The block diagram explaining the more concrete structure of the intercom apparatus of this invention. The time chart explaining operation | movement of short distance call mode. The time chart explaining operation | movement of long-distance call mode.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Intercom apparatus 2 Door phone cordless handset SP Speaker MC Microphone 13 Call switch 14 Wireless receiving means 14a Wireless response switch 15 Voice switch (voice switch integrated circuit)
16 Call Control Unit 11 Received Voice Room Amplifying Unit 17 Transmitted Voice Handset Amplifying Unit 18 Transmitted Voice Room Amplifying Unit 19 Received Voice Handset Amplifying Unit S Interphone System

Claims (4)

In an intercom system configured by connecting a doorphone slave unit having a call switch and a hands-free intercom device having a speaker and a microphone by wire connection and adding a wireless response switch,
A call switch,
Wireless receiving means for receiving a response signal from the wireless response switch;
A voice switch that selectively allows passage of both signals by performing insertion loss between the transmission voice signal input through the microphone and the reception voice signal input from the door phone handset side;
When the answer operation by the call switch is accepted, the loss ratio of the short distance call mode is selected, while when the answer operation by the wireless answer switch is accepted, the loss ratio of the long distance call mode is selected and inserted by the voice switch. A call control means for identifying the loss,
The loss ratio in the short-distance call mode is such that the voice switch performs the transmission voice signal and the reception voice signal under the initial state where both the level of the transmission voice signal and the level of the reception voice signal are equal to or less than a predetermined value. Is initially set to a value that allows the voice switch to pass evenly, and the loss ratio in the long-distance call mode is initially set to a value that allows the voice switch to pass the transmission voice signal preferentially under the initial state. Intercom equipment characterized by that. In claim 1,
A reception voice indoor side amplifying means capable of changing a first gain that is an amplification gain of a reception voice signal that passes through the voice switch and is input to the speaker;
Further comprising: a transmission voice indoor side amplifying means capable of changing a second gain which is an amplification gain of a transmission voice signal inputted to the voice switch through the microphone;
The call control means sets the first gain and the second gain to respective predetermined reference values when selecting the loss ratio of the short distance call mode, while selecting the loss ratio of the long distance call mode. An intercom device, wherein a first gain is set higher than a predetermined reference value in the short-distance call mode, and a second gain is set lower than a predetermined reference value in the short-distance call mode. In claim 2,
Transmission voice handset side amplifying means that can change a third gain that is an amplification gain of the transmission voice signal that passes through the voice switch and is output to the intercom handset,
A receiving voice slave unit side amplifying means capable of changing a fourth gain, which is an amplification gain of the received voice signal inputted from the door phone slave unit to the voice switch,
The call control means sets the third gain and the fourth gain to respective predetermined reference values when the loss ratio of the short distance call mode is selected, while selects the loss ratio of the long distance call mode. An intercom device characterized in that a third gain is set higher than a predetermined reference value in the short distance call mode and a fourth gain is set lower than a predetermined reference value in the short distance call mode. In claims 1 to 3,
When the call control means detects that a predetermined operation input has been made to the call switch, the call control means subsequently shifts the voice switch to the background noise setting mode for a predetermined length of time, and the voice is switched in the background noise setting mode. The maximum value of the sum of the transmission voice signal level from the microphone observed by the switch and the reception voice signal level transmitted from the door phone slave unit is stored in the voice switch as the predetermined value giving the initial state. Is,
When the background noise setting mode is automatically canceled after a predetermined length of time has elapsed, the voice switch determines whether or not the initial state is in accordance with the predetermined value in the immediately preceding background noise setting mode. Intercom equipment to be used.

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