JP2002199420A - Key telephone set - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a key telephone set that can be manufactured efficiently and managed through the design that a single model of the set can cope with places of delivery or requirements of various models. SOLUTION: The key telephone set is provided with a place of delivery setting means 2a or a model setting means 2b, CPU 3, a storage means 4, gain revision means 5, voice amplifying means 6, codec 7, interface 8, service tone generator 9, key entry section 19, display device 11, transmitter unit (T) 12, receiver unit (R) 13, and loud speaker SP. The CPU 3 matches the gain of the voice amplifier means 6 with that of the requirements and specifications of the place of delivery or the model, by way of the storage means 4 and the gain revision means 5, based on setting information JSC from the place of a delivery setting means 2a or a model setting means 2b and making the key telephone circuit common is realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key telephone capable of setting the level of an analog audio system, and more particularly to a key telephone capable of coping with a plurality of destinations having different specifications in one type of model or a plurality of models having different specifications. About.

[0002]

2. Description of the Related Art FIG. 7 shows a list of specifications of analog voice transmission, reception, key tone, and ring tone levels of analog telephone systems by country and model of telephone. The analog voice system has different specifications for Japan, the United States, and the United Kingdom (destination), and even in the same country, the specifications also differ depending on the type of telephone such as a standard telephone or a hands-free phone.

FIG. 8 shows a list of specifications of analog voice transmission / reception amplifiers and service tone amplifiers for telephones by country and model. The specification of the amplifier gain of the analog voice system is different for each of Japan, the United States, and the United Kingdom (destination), and the specification also differs depending on the type of telephone such as a standard telephone or a hands-free phone.

A conventional key telephone is disclosed in Japanese Patent Laid-Open No. 58-18 / 1983.
As disclosed in Japanese Unexamined Patent Publication No. 2940, a configuration in which an amplifier gain is set as shown in FIG. 8 to satisfy the level specification shown in FIG. 7 is known.

FIG. 9 is a schematic block diagram of a key telephone set disclosed in Japanese Patent Application Laid-Open No. 58-182940.
In the key telephone 50 shown in FIG.
The F unit 51 is connected to the exchange via a telephone line, and transmits and receives digital voice signals and control signals for the key telephone 50.

The codec unit 52 decodes (decodes) a digital audio signal supplied from the I / F unit 51 with the exchange and supplies an analog audio signal (received signal) to the receiving amplifier unit 53. The analog voice signal (transmission signal) supplied from the transmission amplifier unit 54 is encoded (coded), and the digital voice signal is transmitted to the I / O switch.
It is supplied to the F section 51.

The receiving amplifier unit 53 amplifies the analog audio signal (receiving signal) supplied from the codec unit 52 and supplies the amplified signal to the audio path switching unit 55. The transmitting amplifier unit 54
The analog audio signal (transmission signal) supplied from the audio path switching unit 55 is amplified and supplied to the codec unit 52.

The voice path switching section 55 is constituted by an electronic switch, switches the switch by a control signal from the voice path control setting memory 63, and transmits a voice signal of a transmission system to the transmission amplifier section 5.
4 or an audio signal of a receiving system supplied from the receiving amplifier unit 53 to the handset receiving amplifier 68 or the speaker receiving amplifier 69.

A handset key tone output section 56 outputs a handset key tone, and a handset key tone amplifier 57 amplifies the handset key tone and supplies it to a handset receiving amplifier 68.

A speaker key tone output section 58 outputs a key tone for a speaker, and a speaker key tone amplifier 59 amplifies the key tone for a speaker and supplies the amplified key tone to a speaker receiver amplifier 69. The ringtone output section 60 outputs a ringtone for the speaker, and the ringtone amplifier 61 amplifies the ringtone for the speaker and supplies it to the speaker reception amplifier 69.

Service tone output control setting memory 62
Sets whether to output a handset key tone, a speaker key tone, and a ring tone according to command information from the CPU 66. The voice path control setting memory 63 includes a CPU 6
6, the state of the voice path switching unit 55 is set.

The key scan circuit 64 includes a key input unit 65
, And supplies the key information to the CPU 66. LCD display section 67 displays the state of key telephone 50 based on the display information supplied from CPU 66.

The handset receiver amplifier 68 amplifies a voice signal (receiver signal) supplied through the voice path switching unit 55, supplies the amplified receiver signal to a handset receiver (receiver unit) of the handset 72, and (Receiver unit) to output sound. The speaker receiver amplifier 69 is connected to the voice path switching unit 55.
Amplifies the audio signal (received signal) supplied via
The sound is output from the speaker 73.

The handset transmission amplifier 70 amplifies a voice signal (transmission signal) supplied from a handset microphone (transmitter unit) of the handset 72 and sends the signal to the transmission amplifier unit 54 via the voice path switching unit 55. Supply. The talkback transmission amplifier 71 amplifies an audio signal (talkback transmission signal) supplied from the talkback microphone 74 and supplies the signal to the transmission amplifier unit 54 via the audio path switching unit 55.

The conventional key telephone set 50 has a receiving amplifier unit 53 and a transmitting / receiving amplifier unit 53 in order to satisfy the specifications of the analog voice transmission, reception, key tone and ring tone according to the country-specific and model-specific specifications shown in FIG. The amplifier gain of the amplifier unit 54, the handset key tone amplifier 57, the speaker key tone amplifier 59, the ring tone amplifier 61, the handset receiving amplifier 68, the speaker receiving amplifier 69, the handset transmitting amplifier 70, and the talkback transmitting amplifier 71 are set to the destination or The specifications shown in FIG. 8 are individually set for each model.

[0016]

In conventional key telephones, the levels of analog voice transmission, reception, key tone and ring tone are different for each destination or model, so the amplifier gains of various amplifiers are individually set. In addition, there are many types of parts such as resistors and capacitors for setting the amplifier gain, and the procurement and management of parts, as well as the assembly and management at the time of manufacture, require a lot of man-hours. is there.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a key telephone capable of responding to a destination or a model with one model, and capable of efficient production and management. It is in.

[0018]

In order to solve the above-mentioned problems, a key telephone according to the present invention comprises a destination setting means for setting a level corresponding to a destination, and a voice based on setting information from the destination setting means. Storage means for storing level information corresponding to the level; and gain changing means for changing the gain of the audio amplification means for amplifying the audio signal based on the level information supplied from the storage means, and It is characterized by corresponding to the destination.

The key telephone according to the present invention includes destination setting means for setting the audio level of the key telephone for each destination. The gain of the audio amplifying means is set to the destination only by changing the setting of the destination setting means. It is possible to conform to the corresponding specifications, and it is not necessary to prepare a model for each destination, and by sharing one model, efficient production and product management can be realized.

Further, the key telephone according to the present invention comprises a model setting means for setting a level corresponding to the model, a storage means for storing level information corresponding to the audio level based on the setting information from the model setting means, There is provided a gain changing means for changing the gain of the audio amplifying means for amplifying the audio signal based on the level information supplied from the storage means, wherein one type of model is compatible with a plurality of models.

The key telephone set according to the present invention is provided with model setting means for setting the audio level of the key telephone set for each model. By simply changing the setting of the model setting means, the gain of the audio amplifying means is adjusted to a specification corresponding to the model. It is not necessary to prepare a telephone for each model, and by sharing one model, efficient production and product management can be realized.

Further, the key telephone according to the present invention comprises:
An LSI for a key telephone equipped with at least a storage unit, a gain changing unit and a variable gain unit of a sound amplifying unit is provided.

A key telephone set according to the present invention is provided with at least a storage means, a gain changing means, and a variable gain amplifier (variable gain amplifier) of a voice amplifying means.
Since I is provided, it is possible to absorb the gain of a different amplifier for each destination or model, and to share the circuit of the key telephone.

Further, the destination setting means or the model setting means according to the present invention is a switch capable of setting a plurality of bits.

Since the destination setting means or the model setting means according to the present invention is a switch capable of setting a plurality of bits, the bits corresponding to the destination or the model can be easily set by the dip switch. Alternatively, it can be set to a key telephone corresponding to each model, and operability can be improved.

Further, the destination setting means or the model setting means according to the present invention is characterized in that it is a storage medium storing setting information.

Since the destination setting means or the model setting means according to the present invention is a storage medium storing setting information,
By simply reading the storage medium prepared for each destination or each model, it is possible to set the key telephone corresponding to each destination or each model, thereby improving convenience.

Further, the gain changing means according to the present invention is characterized by comprising switch means for switching a resistor for adjusting the gain of the audio amplifying means based on the level information.

Since the gain changing means according to the present invention has the switch means for switching the resistor for adjusting the gain of the audio amplifying means based on the level information, the setting of the destination setting means or the model setting means makes the amplifier changeable. The gain can be automatically adjusted to the specification of each destination or each model, and efficient gain setting can be realized.

[0030]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a basic block configuration diagram of an embodiment of a key telephone according to the present invention. FIG.
, The key telephone 1 includes a destination setting means 2a or a model setting means 2b, a CPU 3, a storage means 4, a gain changing means 5, a voice amplifying means 6, a codec 7, an interface 8, a service tone generator 9, and a key input unit 10. , A display 11, a transmitter unit (T) 12, a receiver unit (R) 13, and a speaker SP.

The destination setting means 2a comprises a storage medium such as a dip switch or a memory card, and supplies the CPU 3 with bit or ID number setting information JSC corresponding to the destination (for example, Japan, United States, United Kingdom). .

The model setting means 2b includes a dip switch,
It is configured by a storage medium such as a memory card, and supplies the CPU 3 with bit or ID number setting information JSC corresponding to the model (for example, a standard telephone or a handsfree phone).

FIG. 2 is a conceptual diagram showing an embodiment of the destination setting means or the model setting means according to the present invention. (A)
The figure shows an example constituted by dip switches, and the figure (b) shows an example constituted by a memory card. (A) In the figure, the destination setting means 2a or the model setting means 2b is constituted by a dip switch, and by turning on or off each contact of the switches sw1 and sw2, for example, "1" in an on state, an off state Generates the setting information JSC of the binary code of "0".

For example, the dip switch sw1 is turned off,
The dip switch sw2 is turned on, and the setting information JSC of "10" is supplied to the CPU 3. Dip switch
Depending on the combination of on / off of w1 and sw2, "00",
Since the 2-bit setting information JSC of "01", "10" and "11" is obtained, the destination should be set so that "00" corresponds to Japan, "01" corresponds to the United States, and "10" corresponds to the United Kingdom. Can be. Also, the model can be set so that “00” corresponds to a standard telephone and “01” corresponds to a hands-free phone.

In FIG. 3 (b), a destination setting means 2a or a model setting means 2b is constituted by a memory card and is stored in a storage medium such as a memory card for each destination (Japan, United States, United Kingdom) or for each model. Is read by a reader (not shown), and the read ID number is generated as setting information JSC. Note that the memory capacity of the memory card may be increased, and the level information for each destination or each model to be stored in the storage means 4 may be directly stored.

The CPU 3 controls the entire operation of the key telephone 1. The CPU 3 has a memory, and stores 2-bit information or I-bit information for each destination (Japan, United States, United Kingdom, etc.) in advance.
The level information corresponding to the D number is stored, and when the 2-bit information or the setting information JSC of the ID number is supplied from the destination setting means 2a or the model setting means 2b, the level corresponding to the setting information JSC from the memory ( Receiving, transmitting, and tone) information JR, JT, and JN are read and supplied to the storage means 4. When the capacity of the memory card shown in FIG. 2 (b) is sufficiently large, the level (receiving, transmitting, tone) information JR, JT, JN is directly stored in the memory card, so that the memory of the CPU 3 is stored. Can be deleted.

The CPU 3 transmits and receives the control signal CO to and from the interface 8, and executes control according to the state of the telephone line or telephone. In addition, the CPU 3 operates the key input unit 1
Originating, holding, based on key information JK supplied from 0,
It controls the operation of functions such as a telephone call, and supplies the display information JH to the display 11 to control the status display of the key telephone 1.

Further, the CPU 3 supplies the drive information JD to the service tone generator 9 for generating a service tone such as a key tone, a ring tone, a hold tone, etc.
Generate.

The storage means 4 includes a rewritable RAM, EE
It is composed of a memory such as a PROM and a serial / parallel converter and includes a reception level memory 4A, a transmission level memory 4B, and a tone level memory 4C. Receiving level memory 4A
Stores the level (reception) information JR supplied from the CPU 3 and stores the serial level (reception) information JR.
Is converted into parallel reception control information CR, and the reception control information CR is provided to the gain changing means 5.

The transmission level memory 4B stores level (transmission) information JT supplied from the CPU 3, and
The serial level (transmission) information JT is converted into parallel transmission control information CT, and the transmission control information CT is converted into gain changing means 5.
To provide.

The tone level memory 4C stores the level (tone) information JN supplied from the CPU 3, converts the serial level (tone) information JN into parallel tone control information CN, and gains the tone control information CN. Provided to the changing means 5.

The gain changing means 5 is constituted by an electronic switch such as an analog switch and includes a receiving gain changing means 5A, a transmitting gain changing means 5B, and a tone gain changing means 5C. The receiving gain changing means 5A is constituted by a plurality of analog switches, and drives the switch on or off based on the parallel receiving control information CR supplied from the receiving level memory 4A, and the receiving gain connected in parallel with the switch. The gain of the receiving amplifier 6A is changed by short-circuiting or opening the adjusting resistor.

The transmission gain changing means 5B is constituted by a plurality of analog switches, and drives the switch on or off based on the parallel transmission control information CT supplied from the transmission level memory 4B, and switches the switch in parallel with the switch. Short-circuit or open the transmission gain adjusting resistor connected to the transmission amplifier 6
Change the gain of B.

The tone gain changing means 5C is constituted by a plurality of analog switches, and drives the switches on or off based on the parallel tone control information CN supplied from the tone level memory 4C, and is connected in parallel with the switches. The gain of the service tone amplifier 6C is changed by short-circuiting or opening the adjusted tone gain adjusting resistor.

FIG. 3 is an explanatory diagram of the configuration of the gain changing means and the gain adjustment according to the present invention. FIG. 3 illustrates the gain adjustment of the receiving gain changing means 5A and the receiving amplifier 6A as an example, but the transmitting gain changing means 5B and the transmitting amplifier 6B or the tone gain changing means 5C and the service tone amplifier 6C
The same applies to the gain adjustment.

In FIG. 3, the receiving gain changing means 5A comprises:
It is composed of n analog switches cw1 to cwn, and the analog switches cw1 to cwn are connected in parallel with respective series-connected gain adjusting feedback resistors R1 to Rn of the receiving amplifier 6A composed of the operational amplifier OP. I do. The analog switches cw1 to cwn are in a make-up state (indicated by a broken line) when the parallel reception control information CR1 to CRn supplied from the reception level memory 4A is at the H level, and break when the reception control information CR1 to CRn is at the L level. display)
State. That is, when the analog switches cw1 to cwn are in the make state, the feedback resistors R1 to Rn are short-circuited to have a resistance value of 0, while when the analog switches cw1 to cwn are in the break state, the feedback resistors R1 to Rn are left as they are. It becomes the resistance value.

On the other hand, the gain GR of the receiving amplifier 6A is GR =
Since Vr / VR = -RL / RI, the feedback resistance RL
If any of the resistors R1 to Rn (= Ro + R1 + R2 +... + Rn) is short-circuited by the corresponding analog switches cw1 to cwn, the feedback resistance RL decreases and the gain GR decreases.

Therefore, the analog switches cw1-cw
When all of the switches wn are on, the feedback resistance RL (= R0) is obtained, and the gain GR (= -R0 / RI) is minimized. When all the analog switches cw1 to cwn are off, the feedback resistance RL is set.
(= R0 + R1 + R2 +... + Rn) and the gain GR ｛= −
(R0 + R1 + R2 +... + Rn) / RI} is the maximum. In the present embodiment, the feedback resistor RL is switched as a gain adjusting resistor. However, the input resistor RI may be switched.

The audio amplification means 6 comprises an operational amplifier (op-amp) whose gain can be changed and amplifies the level of an analog audio system, and includes a reception amplifier 6A, a transmission amplifier 6B, and a service tone amplifier 6C. As described with reference to FIG. 3, the receiving amplifier 6A amplifies the gain of the analog receiving signal VR supplied from the codec 7 by making the feedback resistor RL switchable, and amplifies the receiving signal Vr (=
GR × VR) is supplied to the receiver unit (R) 13.

The receiving amplifier 6A includes a plurality of feedback resistors R1 to Rn for gain adjustment as described with reference to FIG.
Analog switches cw1 to cw constituting reception gain changing means 5A connected in parallel to feedback resistors R1 to Rn, respectively.
By controlling on / off of wn with the reception control information CR1 to CRn, the gain GR can be changed by adjusting the value of the feedback resistor RL.

The transmission amplifier 6B, like the reception amplifier 6A, is composed of an operational amplifier (op-amp) whose gain can be changed, and converts the analog transmission signal Vt supplied from the transmitter unit (T) 12 into a gain GT. Amplified and amplified transmission signal VT
(= GT × Vt) is supplied to the codec 7. Further, as described with reference to FIG. 3, the transmission amplifier 6B includes a plurality of feedback resistors for adjusting the gain, and transmits the analog switch constituting the transmission gain changing means 5B connected in parallel to each of the feedback resistors. By performing on / off control using the talk control information CT, the value of the feedback resistor can be adjusted to change the gain GT.

The service tone amplifier 6C, like the receiving amplifier 6A, is constituted by an operational amplifier (op-amp) whose gain can be changed, and amplifies the service tone signal TS supplied from the service tone generator 9 by a gain GN. The supplied service tone signal VS (= GN × TS) is supplied to the speaker SP. Also, the gain adjustment of the service tone amplifier 6C is the same as that of the reception amplifier 6A shown in FIG.

The configurations of the storage unit 4, the gain changing unit 5 and the audio amplification unit 6 can be increased or decreased according to the functions required for the audio system.

The codec 7 decodes (decodes) the digital reception signal DR supplied from the interface 8 and converts it into an analog reception signal VR.
Is supplied to the receiving amplifier 6A. Also, codec 7
Analog transmission signal VT supplied from transmission amplifier 6B
Is converted into a digital transmission signal DT, and the transmission signal DT is supplied to the interface 7.

The interface 8 forms various interfaces with the exchange to which the key telephone 1 is connected. The interface 8 exchanges a control signal C0 with the CPU 3 so as to respond to the state of the telephone and the state of the line. Perform the operation. The interface 8 transmits the digital transmission signal DT supplied from the codec 7 to the line, and supplies the digital reception signal DR supplied from the line to the codec 7.

The service tone generator 9 has a key tone,
It has a plurality of service tone transmission functions such as a hold tone and a ring tone, and supplies a service tone TS to the service tone amplifier 6C based on the drive information JD supplied from the CPU 3.

The key input unit 10 is constituted by numeric keys and function keys, and provides the CPU 3 with key information JK corresponding to key operations.

The display 11 comprises a visual display such as a liquid crystal display (LCD), and displays a function corresponding to the operation of the key input unit 10 based on the display information JH supplied from the CPU 3 and a status display of the telephone. I do.

The transmitter unit (T) 12 and the receiver unit (R) 13 constitute a handset with an acoustic-electric converter and an electric-acoustic converter, respectively.
And outputs the reception signal Vr supplied as a voice signal, or converts the voice signal into an electric signal and supplies the transmission signal Vt to the transmission amplifier 6B.

The speaker SP is a service tone amplifier 6
The service tone TS supplied from C is subjected to electro-acoustic conversion, and a key tone, a hold tone, a ring tone, and the like are output as voice.

As described above, the key telephone 1 according to the present invention includes the destination setting means 2a which can set the audio level of the key telephone 1 for each destination.
By simply changing the setting of a, the gain of the audio amplification means 6 can be adjusted to the specification corresponding to the destination, and there is no need to prepare a model for each destination, and by sharing the same model with one model, the efficiency is improved. Production and product management can be realized.

The key telephone 1 according to the present invention comprises:
A model setting means 2b capable of setting the audio level of the key telephone 1 for each model is provided. By simply changing the setting of the model setting means 2b, the gain of the audio amplifying means 6 can be adjusted to a specification corresponding to the model. There is no need to prepare a telephone, and by sharing a single model, efficient production and product management can be realized.

Further, the destination setting means 2 according to the present invention.
a or the model setting means 2b is a switch sw1 or sw2 which can set a plurality of bits. Therefore, a bit corresponding to a destination or a model can be easily set by a dip switch. It can be set to the key telephone 1, and operability can be improved.

Further, the destination setting means 2a according to the present invention.
Alternatively, since the model setting means 2b is a storage medium storing setting information, the setting is made in the key telephone 1 corresponding to each destination or model only by reading the storage medium prepared for each destination or model. And convenience can be improved.

Further, the gain changing means 1 according to the present invention
Has analog switches cw1 to cwn for switching the resistors for adjusting the gain of the audio amplifying means based on the level information, so that the destination setting means 2a or the model setting means 2b
With this setting, the gain of the amplifier can be automatically adjusted to the specifications of each destination or each model, and efficient gain setting can be realized.

Next, a practical example of the key telephone according to the present invention will be described. FIG. 4 is a block diagram of a main part of a practical embodiment of a key telephone according to the present invention. In FIG. 4, the key telephone 21 includes a key telephone LSI 15. The LSI 15 for a key telephone is
Interface with exchange (I / F), codec section,
It is an IC having functions such as a communication amplifier, voice path switching, and key scanning.

The CPU 26 has a CPU interface 15
Through -3, it controls the entire key telephone 21 such as the set value of each amplifier inside the key telephone LSI 15, presence / absence of service tone output, voice path control, key scan, and the like. The setting means 29 is a destination setting means 2 shown in FIG. 1 for setting a country telephone and a type of telephone.
a or the model setting means 2b, and the setting contents are
Notify 26.

Interface (I / F) section 1 with exchange
5-1 is connected to an exchange via a line to transmit and receive digital voice signals and control signals for the key telephone 21. The codec section 15-2 converts a digital voice signal received from the interface (I / F) section 15-1 with the exchange into an analog voice signal (received signal) and an analog voice signal (transmitted signal). ) Is converted into a digital voice signal and the interface (I)
/ F) to the section 15-1.

The variable gain receiving amplifier 15-4 receives the voice signal (received signal) from the codec 15-2, and the variable gain transmitting amplifier 15-5 transmits the voice signal (transmitted to the codec 15-2). The transmission signal is amplified according to the contents of the transmission / reception variable amplifier setting memories 15-17.

The voice path switching unit 15-6 switches the voice of the key telephone 21 and the service tone. The handset key tone output unit 15-7 outputs a key tone for a handset, and the handset key tone variable amplifier unit 15-8 amplifies a handset key tone signal. The speaker key tone output unit 15-9 outputs a key tone for a speaker, and the speaker key tone variable amplifier unit 15-10 amplifies a signal of the speaker key tone. The ringtone output section 15-11 outputs a ringtone for a speaker, and the ringtone variable amplifier section 15-12 amplifies the ringtone.

Service tone variable amplifier setting memory 15
Step -19 sets the gains of the handset key tone variable amplifier section 15-8, the speaker key tone variable amplifier section 15-10, and the ring tone variable amplifier section 15-12 according to an instruction from the CPU 26.

Service tone output control setting memory 15-
18 sets whether or not to output a key tone and a ringtone according to an instruction from the CPU 26. Voice path control setting memory 15
-20 is the voice path switching unit 1 according to an instruction from the CPU 26.
Set the status of 5-6. Key scan circuit 15-21
Executes key detection from the key input unit 28. LCD
The display unit 27 is connected to the CPU 26, and displays an operation state and a line state of the telephone.

The handset receiver amplifier 22 is a fixed gain amplifier, and is connected to the receiver unit (R) to amplify the handset receiver signal. The speaker receiving amplifier 23 is an amplifier having a fixed gain, and is connected to a speaker and amplifies a speaker receiving signal. The handset transmission amplifier 24 is a fixed gain amplifier and is connected to the transmitter unit (T) to amplify the handset transmission signal. The talkback transmission amplifier 25 is a fixed gain amplifier, and is connected to a talkback microphone and amplifies a talkback transmission signal.

Handset receiver variable amplifier 15-15
Indicates the level of the handset reception signal, and the speaker reception variable amplifier unit 15-14 indicates the level of the speaker reception signal.
The handset transmission variable amplifier section 15-15 stores the level of the handset transmission signal, and the talkback transmission variable amplifier section 15-16 stores the level of the talkback transmission signal in the transmission / reception variable amplifier setting memory 15-17. Amp according to the content.

The required specifications of the signal level of the telephone system (transmitting system, receiving system, service tone) of the telephone are shown in FIG. 7 for the transmission, reception, key tone and ring tone of the analog voice system for each country and model of the telephone. As shown in the specification list at the level, it depends on the destination (Japan, United States, United Kingdom). In order to satisfy the specifications of FIG. 7, the amplifier gain of the communication system is set to the value shown in FIG. 5 corresponding to the destination. Further, in order to satisfy the specifications of FIG. 7, the amplifier gain of the communication system is set to the value shown in FIG. 6 corresponding to the model (standard telephone, hands-free phone).

In FIGS. 5 and 6, (a)
The figure shows the amplifier gain of the receiving system, and the figure (b) shows the amplifier gain of the transmitting system. The set values of the variable amplifier are shown in the bold frames in FIGS. 7A and 7B, and the variable amplifier is accommodated in the key telephone LSI 15.

As described above, the gain of the variable amplifier section for transmitting, receiving and service tones mounted on the key telephone LSI 15 of the key telephone 21 is set by the setting means 29.
By setting the amplifier gain shown in FIG. 5 or 6 for each destination or each model, the required specifications shown in FIG. 7 can be satisfied, and one type of key telephone 21 can be used regardless of country or model. Can be applied in common.

As described above, the key telephone 21 according to the present invention includes the LSI 15 for the key telephone equipped with the variable gain unit of the audio amplifying means, so that it is possible to absorb the gain of the amplifier different for each destination or model. The circuit of the key telephone can be shared.

[0079]

As described above, the key telephone set according to the present invention is provided with the destination setting means which can set the audio level of the key telephone for each destination, and the voice can be changed only by changing the setting of the destination setting means. The gain of the amplifying means can be adjusted to the specifications corresponding to the destination, and there is no need to prepare models for each destination, and by sharing one model, efficient production and product management can be realized. Can be.

Further, the key telephone set according to the present invention is provided with model setting means for setting the audio level of the key telephone set for each model, and the gain of the audio amplifying means corresponds to the model only by changing the setting of the model setting means. It is possible to conform to the specifications, and it is not necessary to prepare a telephone for each model, and by sharing a single model, efficient production and product management can be realized.

Further, the key telephone according to the present invention comprises:
Since there is provided an LSI for a key telephone equipped with at least a storage means, a gain changing means and a variable gain part of a voice amplifying means, it is possible to absorb the gain of an amplifier which differs for each destination or model and to share the circuit of the key telephone. Can be

[Brief description of the drawings]

FIG. 1 is a basic block diagram of a key telephone according to an embodiment of the present invention;

FIG. 2 is a conceptual diagram of an embodiment of a destination setting unit or a model setting unit according to the present invention;

FIG. 3 is an explanatory diagram of a configuration of gain changing means and gain adjustment according to the present invention.

FIG. 4 is a block diagram of a main part of a key telephone according to a practical embodiment of the present invention;

FIG. 5 is a correspondence diagram between a destination and a communication amplifier gain setting value.

FIG. 6 is a diagram showing the correspondence between the model and the communication amplifier gain setting value.

FIG. 7 is a table showing specifications of analog voice transmission, reception, key tones and ring tones for telephones by country and model.

FIG. 8 is a list of specifications of analog audio transmission / reception amplifiers and service tone amplifiers for telephones by country and model.

FIG. 9 is a schematic block diagram of a conventional key telephone.

[Explanation of symbols]

 1, 21 button telephone 2a Destination setting means 2b Model setting means 3 CPU 4 Storage means 4A Receiving level memory 4B Transmitting level memory 4C Tone level memory 5 Gain changing means 5A Receiving gain varying means 5B Transmitting gain varying means 5C Tone gain Variable means 6 Audio amplification means 6A Receiving amplifier 6B Transmission amplifier 6C Service tone amplifier 7 Codec 8 Interface 9 Service tone generator 10 Key input unit 11 Display 12 Transmitter unit (T) 13 Receiver unit (R) 15 Button telephone LSI for

Claims (6)

[Claims] 1. A key telephone set capable of setting a voice level of transmission / reception and a service tone, comprising: a destination setting means for setting a destination; and a voice level based on setting information from the destination setting means. Storage means for storing the obtained level information, and gain changing means for changing the gain of the audio amplification means for amplifying the audio signal based on the level information supplied from the storage means, A key telephone set corresponding to a destination. 2. A key telephone set capable of setting a voice system level of transmission / reception and a service tone, comprising: model setting means for setting a model; and level information corresponding to a voice level based on setting information from said model setting means. , And gain changing means for changing the gain of an audio amplifying means for amplifying an audio signal based on the level information supplied from the storage means. Key telephone. 3. A key telephone LSI including at least a storage unit, a gain changing unit, and a variable gain unit of the audio amplifying unit.
Or the key telephone set according to claim 2. 4. The key telephone set according to claim 1, wherein the destination setting unit or the model setting unit is a switch that can set a plurality of bits. 5. The key telephone set according to claim 1, wherein the destination setting unit or the model setting unit is a storage medium storing setting information. 6. The key telephone set according to claim 1, wherein said gain changing means includes switch means for switching a resistor for adjusting a gain of said audio amplifying means based on level information. .