KR0170034B1 - Keyphone having receiving signal compensating function by digital control - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a key phone telephone having a received voice signal compensation function that compensates reception sensitivity by digital control during handset call. Control and key scanning means 1; Switching means (2) for performing a corresponding mode selection according to a control signal of the microprocessor to set a path for the selected mode; Received voice signal compensation means (3) for varying the received voice signal input by the path selection of the switching means to a multi-level level; And level selection means (4) for selecting any one of the various outputs of the received voice signal compensation means and supplying it to the handset according to the control of the microprocessor and the key scan. Compensation, that is, amplification of the reception sensitivity in several steps during a call, has the effect of allowing the user to perform the call at the optimum sensitivity.

Description

Keyphone Telephone with Incoming Voice Signal Compensation by Digital Control

1 is a schematic block diagram of a key-phone telephone with a received voice signal compensation function by digital control according to an embodiment of the present invention.

2 is a detailed circuit diagram of FIG.

3 is a flowchart illustrating a process of compensating for a received voice signal by digital control.

* Explanation of symbols for main parts of the drawings

1: Path selection control and key scan logic 2: Analog switch

3: receiving voice signal compensation circuit 4: level selection circuit

11: Custom Circuit 12: Key Matrix

13, 15: analog multiplexer 14: receiving voice signal compensation circuit

21, 23: OP amplifier 22: Low pass filter

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a key phone telephone (dedicated terminal of a key system) having a received voice signal compensation function by digital control, and more particularly, a key phone having a received voice signal compensation function that compensates the reception sensitivity in multiple stages by digital control during handset call. It's about the phone.

In general, the key phone system is to provide a variety of services required for office automation, consisting of the main unit, terminal, and other peripherals, and accommodates up to 68 lines (cline + extension + dedicated line), the ratio of the trunk line and extension is arbitrarily variable It is a digital system that makes it possible.

The claim is based on a power module for supplying power to the system, a main module equipped with control and call-related hardware and card insertion connectors for the entire system, a central office trunk module (CTM) for trunk line matching, and a key phone (digital dedicated terminal). ) Digital Subscriber Module (DSM) for matching, Analog Subscriber Module (ASM) for regular telephone matching, Universal Trunk Module (UTM) for leased line matching, Ring-generator Module (RM) for ring supply, It consists of a terminal board module for connecting the internal and trunk lines, the power supply module is supplied with AC 110V or 220V to output -24V, +/- 5V, and includes a charge and discharge circuit of the battery in preparation for power failure.

The keyphone is connected to the main device by two lines, and the number of mountings can be arbitrarily changed to the trunk line or the station in units of eight lines out of 64 lines (including four dedicated lines) including trunk lines and stations, and other peripheral devices And a module for an incoming call monitor function, which can be attached to any key phone, and the two modules add a DSS (Direct Station Selector) that accommodates 40 lines of capacity, and a speaker.

Looking at the characteristics of the key phone system, all information is generated, exchanged, and controlled by a stored program control method, and data communication of the main device and the dedicated terminal period is performed using 16-bit and 8-bit microcontroller units (MCUs). It has a multi-processing system.

In addition, voice data processing provides excellent call quality by operating a channel in time division multiplexing by pulse code modulation, and adopts a non-blocking switch network. It provides the maximum call success rate to all subscribers, and the function-specific circuit is accommodated in the printed circuit board assembly (PBA) to simplify the capacity expansion and maintenance.

The maximum capacity of the system is 68 lines, of which 64 lines can be arbitrarily changed without distinction between trunk lines and stations, and the remaining 4 lines are dedicated lines and three ways on one board (Loop-Dial.E M. Ring Down). By accepting a dedicated line, it can be selectively serviced according to the user's environment, and the user terminal can accommodate a key phone (digital dedicated terminal), a general telephone, and a facsimile (FAX) at the same time, and the wiring between the main device and the terminal uses two-wire type. do.

Conventional analogue telephone phones have used op amps and variable resistors for gain control to compensate for incoming voice signals.

However, in the related art, it is difficult to control the amplification rate because the amplification degree is controlled by a given variable resistance value, and there are disadvantages specific to analogs such as breakage and noise generation when used for a long time.

The present invention has been made in view of the above circumstances, and the received voice by digital control enables the user to conduct a call with an optimum sensitivity by compensating, ie, amplifying the reception sensitivity in a handset call in various stages through the burnt operation. The object is to provide a key-phone telephone with signal compensation.

According to the present invention for realizing the above object, a path selection control and key scanning means for analyzing a handset mode or a hands-free mode by a microprocessor and scanning a pressed key: performing a corresponding mode selection according to a control signal of the microprocessor. Switching means for setting a path for the selected mode; Received voice signal compensation means for varying the received voice signal input by the path selection of the switching means to a multi-level level; And level selection means for selecting any one of the various outputs of the received voice signal compensation means and supplying it to the receiver according to the control and key scan of the microprocessor.

That is, according to the present invention having the above-described configuration, the reception sensitivity can be adjusted to a multi-level level by a simple button operation, thereby providing an optimal call state to the user.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention.

1 is a schematic block diagram of a key-phone telephone with a received voice signal compensation function by digital control according to an embodiment of the present invention, wherein reference numeral 1 denotes a handset mode or a hands-free mode by a microprocessor provided in the key phone. It is path selection control and key scan logic which analyzes the recognition to control the analog switch 2 to be described later, and which button is pressed by the user, and 2 performs the corresponding mode selection according to the control signal given by the microprocessor. Thus, an analog switch for setting a path for a selected mode of the handsfree mode or the handset mode.

Reference numeral 3 is a received voice signal compensation circuit for varying a handset (handset) voice signal input by the path selection of the analog switch 2 to a desired level and removing noise, and 4 is a control of a microprocessor. And a level selection circuit for selecting an amplification level value according to the key scan.

FIG. 2 is a detailed circuit diagram of FIG. 1, and reference numeral 11 denotes a handset in case of a handset mode by driving an analog multiplexer 13 described below by generating a selection signal for selecting a path by performing a key scan from the key matrix 12. A custom circuit section for selecting a path of the mode and generating a control signal for determining the amplification level, and 13 is an analog multiplexer set to the handset mode in accordance with the selection signal of the custom circuit section 11.

In addition, the reference numeral 14 receives a voice signal received through the analog multiplexer 13, compensates the input by various amplification degrees (amplification degree of 4 levels in this embodiment), and removes a signal of 4KHz or more to remove the voice band frequency ( 200 to 3400 Hz), which is a received voice signal compensation circuit for removing noise, and 15 selects one of the output signals amplified to various levels of the received voice signal compensation circuit according to the control signal of the custom circuit unit 11. Analog multiplexer to output to the receiver.

The received voice signal compensation circuit 14 will be described in detail as follows.

First, reference numeral 21 is an OP amplifier for amplifying a received voice signal to a certain degree, and 22 is a low pass for passing only a signal of voice band frequency (200 to 3400 Hz) by removing a signal of 4 KHz or more from the output of the OP amplifier. The filter 23 is an OP amplifier for amplifying and outputting the signal through the low pass filter to four levels.

In this configuration, the gain, i.e., the amplification degree adjustment, is four levels in which the analog multiplexer 15 is amplified through the OP amplifier 23 by the control signals HSVOLA and HSVOLB generated by the custom circuit section 11 (this embodiment). Selects one of the output signals) so that the amplified voice signal is supplied to the receiver.

FIG. 3 is a flowchart illustrating a process of compensating a received voice signal by digital control. As shown in FIG. 3, first, in the case of the received voice signal compensation, it is determined whether the mobile device is in the handset mode (ST1). In this case, the process is terminated, and in the handset mode, key scanning is performed to check whether the received voice signal compensation circuit recognizes the level selection key (ST2). If the level selection key is not pressed and another key is pressed, the corresponding mode is executed (ST3). If the level selection key is pressed, the selected level control signal is output (ST4), and the output value corresponds to the corresponding level value. Accordingly, by driving the received voice signal compensation circuit (ST5), the compensation process of the received voice signal of the present embodiment is completed.

The received voice signal amplified to the level desired by the user through the above-described process is supplied to the receiver through the analog multiplexer 15, and the optimal voice quality can be provided according to the user's selection through the key matrix. will be.

That is, according to the above embodiment, the user can perform the call with the optimum sensitivity by compensating, ie, amplifying the reception sensitivity during the handset call in several steps through the button manipulation.

The present invention is not limited to the above embodiments and can be modified in various ways within the scope not departing from the technical gist of the present invention.

Claims (5)

Path selection control and key scanning means for analyzing, by the microprocessor, whether in handset mode or hands-free mode, and scanning the pressed key; Switching means for setting a path for a selected mode by performing a corresponding mode selection according to a control signal of the microprocessor; Received voice signal compensation means for varying the received voice signal input by the path selection of the switching means to a multi-level level; And a level selection means for selecting any one of the various outputs of the received voice signal compensation means and supplying it to the receiver according to the control of the microprocessor and the key scan. Equipped key-phone telephone. The key phone according to claim 1, wherein said received voice signal compensation means further includes a function of removing noise from an input received voice signal. 3. The apparatus of claim 2, wherein the received speech signal compensation means comprises: first amplifying means for amplifying an input received speech signal with a predetermined amplification degree; A filter for removing noise at the output of said first amplifying means; And a second amplifying means for amplifying the signal through the filter to a multi-level level. The key phone according to claim 3, wherein said filter is a low pass filter for removing a specific frequency or more that is regarded as noise. 5. The method of claim 1 or 4, wherein the switching means and level selecting means are multiplexers connected to select any one of a plurality of inputs according to respective control signals. Key-phone telephone with incoming voice signal compensation.