KR20020044720A - Subscriber unit for transmission system - Google Patents

Abstract

PURPOSE: A subscriber unit for a transmission system is provided to offer a specific ring-back tone to each user by embedding a ring-back tone generating unit including a melody integrated circuit. CONSTITUTION: A subscriber connecting unit(11) connects to a telephone of a subscriber, checks on-hook and off-hook states of the telephone, and transmits inputted and outputted voice data. A signal processing unit(12) receives a ring-back tone(DNSIG) transmitted from an origination side to output a ring control signal(RC), and receives a sensing signal(DET) from the subscriber connecting unit(11) when a telephone of a termination side subscriber is the on-hook state to output a termination signal(UPSIG) for informing that the origination side and a termination side connect. A ring-back tone generating unit(13) generates a ring-back tone. An analog switch(14) provides the ring-back tone of the ring-back tone generating unit(13) to the telephone of the termination side subscriber according to the ring control signal(RC) through the subscriber connecting unit(11). A data converting unit(15) receives analog signals of the origination side and the termination side when the origination side and the termination side connect, converts the analog signal into a digital signal, and transmits the digital signal through a multiplexing unit.

Description

Subscriber unit of transmission system {SUBSCRIBER UNIT FOR TRANSMISSION SYSTEM}

The present invention relates to a subscriber unit of a transmission system, and more particularly to a subscriber unit of a transmission system capable of providing various ring tones for each subscriber.

Fig. 1 is a block diagram of a conventional transmission system, and as shown therein, a ring generator 1 for generating a 20 Hz ring tone for calling a called party at a calling party of a subscriber; A multiplexer 2 which multiplexes the digital data and signals to be transmitted and received according to a frame and applies a frame clock FP and a master clock MCLK to a subscriber side; Directly connected to the subscriber's phone and operated according to the ring signal of the ring generating unit 1 and the clock signal of the multiplexer 2 to monitor the subscriber's occupancy state, the ring signal is applied to the subscriber's phone and the subscriber The subscriber unit 3 converts the analog audio signal into digital data and is applied to the multiplexer 2 and controlled.

Fig. 2 is a detailed configuration diagram of the subscriber unit 3 in Fig. 1, which is connected to a subscriber's telephone and checks the on-hook and off-hook status of the telephone and transmits voice data input and output as shown in FIG. (4); Receives a call signal (DNSIG) from the calling party and outputs a ring control signal (RC). Also, the subscriber connection unit (4) receives a detection signal (DET) that detects the incoming subscriber's phone when it is in an on-hook state. A signal processor 5 for receiving and outputting an incoming signal (UPSIG) indicating that the calling party and the called party are connected; A relay (6) for controlling the ring signal of the ring generating unit (1) to the telephone of the called party through the subscriber access unit (4) in accordance with the ring control signal (RC); When the calling party and the called party are connected, an analog signal of the calling party and the receiving party is applied to convert the digital signal into a digital signal, and is composed of a data converter 7 for mutual transmission control through the multiplexing unit 2.

The operation of the subscriber unit of the conventional transmission system configured as described above will be described below.

First, when the calling party calls the called party having a specific number, the signal processing unit 5 outputs a ring control signal RC in accordance with the applied calling signal DNSSIG.

Then, the relay 6 receiving the ring control signal RC applies a ring signal of the ring generating unit 1 to the called party through the subscriber access unit 4, thereby giving a ring tone indicating that the call is coming. do.

Then, when the called party's subscriber picks up the handset, the subscriber access unit 4 outputs a detection signal DET indicating that the incoming call is received, and the authorized signal processing unit 5 blocks the relay and notifies that the called party and the caller are connected. Send an incoming signal (UPSIG).

In addition, the relay 6 is blocked so that no bell sounds.

Then, the data conversion unit 7 converts the voice analog signal of the called party applied through the subscriber connection unit 4 into a digital signal UPDATA, and outputs it to the caller side through the multiplexer 3 and the optical line, The digital signal DNDATA is converted into an analog signal and applied to the telephone of the called party through the subscriber connection unit 4, thereby enabling a call between the calling party and the called party.

However, the subscriber unit of the conventional transmission system as described above has a separate ring generating unit for generating an incoming call sound, which consumes a lot of power and increases the cost of the facility, and requires a dual operation to stabilize the system. There was this.

It is an object of the present invention to provide a subscriber unit of a transmission system capable of transmitting different ring tones to each subscriber without having a separate ring generator in the transmission system.

1 is a block diagram of a conventional transmission system.

Figure 2 is a block diagram of a subscriber unit in Figure 1;

3 is a block diagram of a transmission system according to the present invention;

4 is a block diagram of a subscriber unit in FIG.

* Description of the symbols for the main parts of the drawings *

11: subscriber connection part 12: signal processing part

13: Calling sound generator 14: Analog switch

15: data conversion unit

The above object is connected to the subscriber's phone and the subscriber connection unit for checking the on-hook and off-hook status of the telephone and transmits the input and output voice data; In addition to receiving a call signal from the calling party and outputting a ring control signal, when the subscriber's phone is on-hook at the subscriber access unit, the receiving signal is received to indicate that the calling party and the called party are connected. A signal processing unit for outputting; A ring tone generator for generating a ring tone; An analog switch which controls the ringing tone of the ring tone generating unit to be controlled by the telephone of the called party through the subscriber access unit according to the ring control signal; When the calling party and the called party are connected, it is achieved by receiving an analog signal of the calling party and the receiving party and converting it into a digital signal to configure a data conversion unit for mutual transmission control through the multiplexing unit. Referring to the drawings in detail as follows.

3 is a block diagram of a transmission system according to the present invention, which is connected to a subscriber's telephone to notify that the telephone is coming by using a ring tone, and converts an analog voice signal into a digital signal or converts a digital voice signal into an analog signal as shown in FIG. A plurality of subscriber units (10) connected to each other so as to make a call between subscribers; It is composed of a multiplexing unit 20 for applying a synchronous clock necessary for the operation of the subscriber unit 10, and multiplexing the input and output signals to transmit control to the transmission system of another subscriber through the optical path.

FIG. 4 is a block diagram of the subscriber unit 10 in FIG. 3, which is connected to the subscriber's telephone and checks the on-hook and off-hook status of the telephone and transmits voice data input and output (as shown in FIG. 3). 11); In response to the call signal DNSSIG coming from the calling party and outputting a ring control signal RC, the subscriber access unit 11 receives a detection signal DET detected when the called party's phone is on-hook. A signal processor 12 for receiving and outputting an incoming signal (UPSIG) indicating that the calling party and the called party are connected; A ring tone generator 13 for generating a ring tone; An analog switch (14) adapted to control the ring tone of the ring tone generator (13) to the telephone of the called party through the subscriber access unit (11) according to the ring control signal (RC); When the calling party and the called party are connected, the converter converts the analog signals of the calling party and the called party into a digital signal and controls the mutual transmission control through the multiplexer 20.

Hereinafter, the present invention configured as described above will be described in more detail.

First, when the call signal DNSSIG of the calling party is applied through the optical path and the multiplexer 20, the signal processor 12 outputs a ring control signal RC.

Next, the analog switch 14 receiving the ring control signal RC applies a ring tone generated by the ring tone generator 13 to the called party through the subscriber access unit 11, thereby informing a ring tone indicating that the call is coming. To me.

At this time, the ring tone generator 13 conventionally used a monotonous low frequency ring signal of 20 Hz, but by using a melody integrated circuit that can provide various ring tones can be called by using a distinctive melody for each subscriber, a separate ring generation By not having wealth, power consumption can be reduced.

Then, when the called party's subscriber picks up the handset, the subscriber access unit 11 outputs a detection signal (DET) indicating that the incoming call is received, and the signal processing unit 12 that has received the call cuts off the analog switch 14 and the called party and the caller. Sends an incoming signal (UPSIG) indicating that is connected.

At this time, the analog switch 14 can be easily configured using an integrated switch circuit.

Next, the data conversion unit 15 converts the voice analog signal of the called party applied through the subscriber connection unit 11 into a digital signal UPDATA, and outputs it to the caller side through the multiplexer 20 and the optical line. The digital signal DNDATA is converted into an analog signal and applied to the telephone of the called party through the subscriber connection unit 11, so that a call can be made between the calling party and the called party.

As described above, the subscriber unit of the present invention can provide a distinctive ring tone for each subscriber by incorporating a ring tone generator including a melody integrated circuit, and reduce power consumption by not having a separate ring generator in the transfer system. It works.

Claims (2)

A subscriber connection unit connected to the subscriber's telephone to check on-hook and off-hook status of the telephone and to transmit voice data input and output; In addition to receiving a call signal from the calling party and outputting a ring control signal, when the subscriber's phone is on-hook at the subscriber access unit, the receiving signal is received to indicate that the calling party and the called party are connected. A signal processing unit for outputting; A ring tone generator for generating various ring tones for calling the called party at the calling party; An analog switch which controls the ringing tone of the ring tone generating unit to be controlled by the telephone of the called party through the subscriber access unit according to the ring control signal; When the calling party and the called party are connected, the subscriber unit of the transmitting system is configured to receive an analog signal of the calling party and the receiving party, converting it into a digital signal and controlling the mutual transmission through the multiplexing unit. . The subscriber unit of claim 1, wherein the ring tone generator is a melody integrated circuit capable of providing various ring tones.