KR950002581B1 - Keyphone system with a speakerphone circuit - Google Patents

Abstract

The method comprises the steps of; converting voice data of internal key phone user into digital data to transmit, transmitting digital data into voice data to transfer to the external phone user, transferring voice digital data to the internal key phone, and transmitting the voice digital data of the external phone user to the internal user through a speaker of the internal key phone.

Description

Method and apparatus for performing speakerphone function by incorporating speakerphone circuit into keyphone main system

1 is a block diagram of an apparatus according to the present invention.

2 is a block diagram of the speakerphone circuit of FIG.

* Explanation of symbols for main parts of the drawings

100: phone phone 110: microphone

120: speaker 130A, B: amplifier

140: telephone call circuit unit 150: codec

160, 210: digital interface unit 200: key phone main system

220: digital switching circuit 230: digital speakerphone circuit

231A, B: digital signal integrator 232: comparator

233A, B: Level Attenuator

The present invention relates to a digital speakerphone of a digital keyphone system, and more particularly, to a method in which a keyphone telephone can perform a function of a speakerphone so that multiple keyphone telephones can be shared by mounting a digital speakerphone circuit in a main device that analyzes digital data and operates accordingly. And to the apparatus.

In general, the number of telephone signal lines applied from outside the office or work site is limited to a predetermined number, and when there are a plurality of telephone signal lines to be connected in a sequential order, all external telephone signal lines are authorized to allocate necessary signals to the internal telephone. This is called a digital key phone system.

Offices equipped with the digital keyphone system, in particular, a place such as a conference room in the office is frequently used to talk to outsiders using a speakerphone, and in such a case, a speakerphone circuit must be built in the keyphone. As a result, since all the telephones that require speakerphone functions must be equipped with speakerphone circuits, the price of the keyphone telephones increases, and keyphone phones that do not have speakerphone circuits cannot make speakerphone calls. .

SUMMARY OF THE INVENTION An object of the present invention for solving the above problems is to provide a method and apparatus for embedding a speakerphone circuit in a digital keyphone main system so as to perform a function of a speakerphone even if the speakerphone circuit does not have an internal wound.

A feature of the present invention for achieving the above object is that the voice data of the internal key-phone user is converted into analog electrical data through a microphone, the changed voice data is converted into digital data and the step of transmitting the digital data of the step Converting and transmitting the voice data of the internal key phone user into digital data, receiving the voice digital data transmitted in the step, lowering the attenuation rate of the voice digital data applied in the step, and reducing the attenuation rate in the step. Converting the lower digital voice data to an external telephone user, converting the digital data into voice data, and transmitting the converted digital data to the external telephone user, receiving the digital voice data of the external telephone user, and receiving the authorized voice in the step. Transmitting the voice digital data to the internal key phone, which comprises the steps of lowering the attenuation rate of the digital data and transmitting the voice digital data having the lowered attenuation rate to the internal keypad phone; The internal key phone user through the speaker of the internal key phone comprising the steps of receiving data, converting the voice digital data into analog electrical data received in the step, and converting the analog electrical data of the step into voice data through the speaker. It includes the process of delivering voice digital data of external telephone users.

Another feature of the present invention for achieving the above object is provided with a microphone means and speaker means for making a speakerphone call and the first amplification means for amplifying the signal output from the microphone means and a signal applied to the speaker means A second amplification means for amplifying and a call circuit portion receiving the output signal of the first amplifying means and applying a signal to the second amplifying means, a codec means for exchanging data with the call circuit portion, a digital keyphone main system means and a digital Key phone telephones comprising a first interface means for communication, and second interface means matched for communication with the first interface means in the key phone telephones and digital speaker phones provided so that the key phone telephones can function as speaker phones. Circuitry and the second interface means and digital It includes a digital keyphone main system composed of digital switching means for connecting the de-speakerphone circuitry.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

1 is a block diagram of a speaker phone embedded device of a digital key phone number system according to an exemplary embodiment of the present invention. Each key phone telephone 100 includes a microphone 110 and a speaker 120 for making a speaker phone call. The first amplifier 130A for amplifying the signal output from the microphone 110, the second amplifier 130B for amplifying the signal applied to the speaker 120, and the first amplifier 130A. A telephone call circuit unit 140 for receiving an output signal of the second amplifier 130B, a codec 150 for exchanging data with the telephone call circuit unit 140, and a digital key phone main system. And a first digital line interface unit 160 for digital communication with the 200, such that the digital keyphone main system 200 is matched to communicate with the first digital line inner face unit 160 in the keyphone telephone. 2nd The digital line interface unit 210 and the digital speakerphone circuit unit 230 are provided so that the key phone telephone 100 functions as a speakerphone. The second digital line interface unit 210 and the digital speech phone circuit unit 230 are provided. ) Is composed of a digital switching circuit 220 for connecting.

A detailed operation description of the speaker phone built-in device of the digital key phone main system configured as described above will be described with reference to FIG. FIG. 2 is a block diagram of the digital speakerphone circuit of FIG. 1, which compares the outputs of the digital signal integrators 231A and 231B and the signal integrators that integrate the signal levels from both sides of the call and controls the attenuators 233A and 233B. The comparator 232 and the level attenuators 233A and 233B attenuate respective signals under the control of the comparator 232.

Hereinafter, a preferable operation example of the apparatus according to the present invention having the above configuration will be described.

First, the voice signal of the user of the phone phone 100 is converted into an analog electric signal through the microphone 110 and output, and the output signal of the microphone 110 is amplified by the first amplifier 130A and then the telephone call circuit unit ( When applied to 140, the telephone call circuit unit 140 applies the output signal of the first amplifier 130A to the codec 150, and the codec 150 converts the applied analog electrical signal into a digital signal to generate a first signal. 1, and transmits to the digital switching circuit unit 220 in the main system 200 through the second digital line interface unit (160, 210),

The digital switching circuit 220 applies voice digital data applied through the first and second digital line interface units 160 and 210 from the key phone telephone 100 to the first input terminal A of the digital speaker circuit unit 230. do.

On the other hand, voice digital data applied from the outside is applied to the second input terminal B of the digital speaker circuit unit 230 through the digital switching circuit unit 220.

The comparator 232 in the digital speaker circuit unit 230 receives the signal applied to the first input terminal A and calculates the output signal of the first digital signal integrator 231A and the second input terminal for calculating the integral of the signal. Compared with the output signal of the second digital signal integrator 231B which receives the signal applied to (B) and calculates the integral of the coral, the attenuation ratio of the level attenuator with the higher integral is lowered, and the calculated integral is By lowering the attenuation rate of the lower side to lower the gain of the closed circuit to 1 or less, it plays a role in eliminating the howling phenomenon.

If the signal integration level applied to the first input terminal (A) is high and the integration level of the signal applied to the second input terminal (B) is low, that is, the user of the key-phone telephone 100 speaks and the external telephone user listens. The output signal of the first level attenuator 233A is transmitted to the external telephone user B ', and vice versa, when the user of the key-phone telephone 100 is listening and the external telephone user is speaking. The output signal of the attenuator 233B is applied to the digital switch circuit unit 220 through the output terminal A 'and transmitted to the key phone telephones 100 to the codec 150 through the second and first digital line interface units 210 and 160. Is approved.

The codec 150 converts the voice digital data signal applied from the main system 200 into an analog electric signal and applies the same to the telephone call circuit unit 140. The telephone call circuit unit 140 supplies the second amplifier 130B. The signal is amplified and transmitted to the speaker 120. Then, the speaker 120 changes the analog electric signal and delivers the same to the user of the key phone 100, thereby ultimately serving as a speaker phone.

By providing the built-in speech phone circuit device of the digital key phone main system which operates as described above, the speaker phone circuit is conventionally used for each key phone telephone, so that the total number of speaker phone circuits can be reduced. Compared to this, integrators and comparators are digitally configured to reduce errors caused by resistors and capacitors.

Claims (5)

The voice data of the internal key phone user is converted into analog electrical data through the microphone, and the changed voice data is converted into digital data, and the voice data of the internal key phone user is converted into digital data. With the process of transmission. Digital data comprising the steps of receiving voice digital data transmitted in the process, lowering the attenuation rate of the voice digital data applied in the step, and connecting the voice digital data having the lowered attenuation rate to the external telephone user. Converting the voice data into voice data and transmitting the voice data to an external telephone user, receiving voice digital data of the external telephone user, lowering attenuation rate of the authorized voice digital data in the step, and lowering the voice reduction rate in the step. Transmitting voice digital data to an internal key phone, the method comprising: transmitting data to an internal key phone; and receiving voice digital data of an external telephone user to be transmitted in the step; A process of delivering voice digital data of an external telephone user to an internal key phone user through a speaker of an internal key phone, which comprises converting digital data into analog electric data and converting analog electric data of the step into voice data through a speaker. Method for performing a function of the speakerphone by incorporating a speakerphone circuit in the keyphone main system comprising a. The method of claim 1, wherein the lowering of the attenuation rate for the specific data comprises: integrating each input data respectively; Comparing the integrated amount of each data integrated in the step: and the step of reducing the attenuation rate of the data with a large integral amount and increase the attenuation rate of the data with a small integral amount compared to the step; Built-in keyphone main system to perform speakerphone functions. The speakerphone circuit according to claim 2, further comprising the step of maintaining the attenuation rate of each data at a predetermined level when the integration amount of each data is similar compared in the comparing step. To perform the function of the speakerphone. A first amplifier means for amplifying a signal output from said microphone means, a second amplifier means for amplifying a signal applied to said speaker means, comprising a microphone means for making a speakerphone call and a speaker means; A communication circuit unit for receiving an output signal of the amplifying unit and applying a signal to the second amplifying unit, a codec unit for exchanging data with the communication circuit unit, and a first interface unit for digital communication with a digital key phone main system unit; A losing keyphone telephone, and a second interface means matched for communicating with a first interface means in the keyphone telephone, and a digital speakerphone circuit portion and the second interface means provided to enable the keyphone telephone to function as a speakerphone. Digital switch for connecting digital speakerphone circuitry A method for performing the function of the built-in speaker to the speaker phone circuitry comprises a Digital Key telephone system in which the main unit is composed of a main key phone system. 5. The apparatus according to claim 4, wherein said speakerphone circuit unit integrates digital signal integrating means for integrating signal levels coming from both sides of the call, integral amount comparing means for comparing the output of said signal integrating means: and under the control of said comparing means, respectively. Apparatus for performing the function of the speakerphone by incorporating a speakerphone circuit in the keyphone main system, characterized in that it comprises a level attenuating means for attenuating the signal.