KR100308336B1 - Volume balance control device between microphone and earphone signal generated from telephone for digital recording system - Google Patents

Abstract

The present invention relates to a telephone transmission and reception volume control device including a T-tap, and more particularly, to match the volume level of the telephone transmission and reception signal branched from the telephone main body, and then through the amplification of the matching signal to the telephone voice recording equipment It is a device to transmit.

To this end, the present invention, the reception signal attenuation block that can adjust the transmission and reception volume level through the attenuation of the receiver signal based on the transmitter signal using the telephone interface block receiving the telephone transmission and reception signal from the telephone body, the reception signal attenuation adjustment It combines the transmission signal and the attenuated reception signal into one signal, and the mixer & output signal amplification block that can adjust the gain of the combined output signal, and the structure that receives the necessary power from the telephone voice recording equipment.

Description

Volume balance control device between microphone and earphone signal generated from telephone for digital recording system}

The conventional method of being used for telephone voice recording equipment is as shown in Fig. 7, after branching the receiver signal from the telephone main body 25 using the T-tap 31, the telephone voice recording equipment (34). Branched signal line 33 is extended to the place where is installed. The telephone voice recording device converts the input signal along the signal line 33 into a digital signal, and then converts the sender's voice signal included in the receiver signal and the receiver voice signal of the side tone into an AGC (Automatic Gain Control) circuit. Use the to adjust the volume level. In this case, the signal to noise ratio (SNR) decreases due to the noise generated in the signal line 33 between the telephone main body 25 and the telephone voice recording equipment, and the signal attenuation and the difference between the transmission and reception volume levels due to the signal line length are not completely solved. There are many cases where the receiver's voice cannot be heard well. In order to completely understand the voice of the receiver in this technique, the development of technology to remove the noise by extracting the voice pattern from the signal having a low SNR has to be preceded. In this case, the voice signal level must be higher than the noise signal level. There is this.

The present invention attaches a telephone transceiver volume control device (19) including a T-tap to a main body of the telephone to branch the signal of the transmitter and the receiver into independent signals, and then uses the variable resistor (39) for receiving signal attenuation adjustment to transmit the transmitter signal. Through the attenuation of the receiver signal as a reference to adjust the volume of the transmission and reception. In particular, the adjusted receiver signal is combined with the transmitter signal in the apparatus 19 and then transmitted to the telephone voice recording equipment 23 through a signal amplification using the variable resistor 38 for gain control of the output signal. The necessary power is supplied from the equipment 23.

1 is a block diagram of a telephone call volume control device

2 degrees is a top view of the telephone volume control device.

3 degrees is a right side view of the telephone volume control device.

4 degrees is a rear view of the telephone volume control device.

5 degree RJ-11 connector pin layout

6 is a system configuration diagram using this device

7 degrees is a diagram of the existing telephone voice recording equipment and telephone connection

8 degrees is a circuit diagram of transmission and reception volume control device

<Description of Signs of Major Parts of Drawings>

1: RJ-11 Jack for Connection with Telephone Body

2: variable resistor for receiver signal gain adjustment

3: variable resistor for output analog signal gain adjustment

4: RJ-11 connector for connecting telephone transmitter and receiver

5: RJ-11 connector for connecting telephone call recording equipment

6: RJ-11 connector No.1 pin 7: RJ-11 connector No.2 pin

8: RJ-11 connector no.3 pin 9: RJ-11 connector no.4 pin

10: Telephone body 11. RJ-11 connector on the telephone body.

12: Receiver 13: Transmitter Jack

14: telephone transceiver 15: transceiver RJ-11

16: RJ-11 jack of the volume control device

17: RJ-11 connector for telephony transceiver

18: RJ-11 connector for connection of telephone voice recording equipment

19: transmission and reception volume control device

20: Signal line RJ-11 Jack

21: Signal line for connecting telephone voice recording equipment

22: Signal line RJ-11 Jack

23: telephone voice recording equipment using this device

24: RJ-11 connector of telephone voice recording equipment

31: T-tap

34: conventional telephone voice recording equipment

36: RJ-11 jack for signal input and reception volume control device

37: RJ-11 connector for transceiver

38: Variable resistor for gain control of output analog signal

39: variable resistor for receiver signal gain adjustment

40: RJ-11 connector for connection to telephone voice recording equipment

Hereinafter, described in detail by the accompanying drawings as follows.

Figure 1 shows a block diagram of a transmission and reception volume control device. Transmitter and receiver signals of the telephone body 10 input to the RJ-11 Jack 16 for input and output of the volume control device are removed from the DC component through a 1: 1 line matching block and pass only pure analog voice signals. Among the transmitted transmitter signal and receiver signal, the receiver signal is adjusted by using the variable resistor 39 for adjusting the received signal attenuation so as to have a volume level similar to the transmitter signal in the received signal attenuation variable resistor, and the adjusted receiver signal and the transmitter signal are adjusted. Are merged in the analog mixer block. The combined signal allows the gain to be adjusted using the variable resistor 38 for gain control of the output signal according to the distance between the telephone voice recording equipment 23 and the telephone main body 10. The system power (+ 5V / 0V) required by the Tx / Rx control device is the RJ-11 connector (18) for the Tx / Rx control device output. It is supplied from, and the output signal, the volume control of the transmit and receive volume is transmitted to the telephone voice recording equipment 23 using the RJ-11 connector 18 pin 1 for the output of the transmit and receive volume control device.

Figure 2 shows the top view of the transmission and reception volume control device, by connecting to the RJ-11 connector (11) installed in the telephone body using the RJ-11 Jack (16) for connecting the telephone body to extract the receiver and transmitter signals. And the variable resistor (2) for adjusting the receiver signal attenuation and the variable resistor (3) for controlling the gain of the output signal are shown in the top view of the transmission / reception volume control device.

3 shows a right side view of the transceiver volume control device, and shows the RJ-11 connectors (No. 4 and 17) for connecting a telephone transceiver. The volume of the telephone transceiver 14 felt by the telephone user is not affected by the presence or absence of the apparatus 19, and the apparatus has an electrical effect only on the telephone voice recording equipment 23.

4 shows a rear view of the transmission / reception volume control apparatus, receives power from the telephone voice recording equipment 23, and simultaneously transmits the output signal of the transmission / reception volume control apparatus to the telephone voice recording equipment 23 for output. Connectors 5 and 18 were attached. + 5V supplied from telephone voice recording equipment 23 was placed on pin 3 (9) of RJ-11 connector (5, 18) for output, and 0V was placed on pin 2 (8) and pin 4 (7). The output signal line whose gain is adjusted from the device is transmitted to the telephone voice recording equipment 23 through pins 6 of the RJ-11 connectors 5 and 18 for output.

Figure 5 shows the pinout of the RJ-11 connector (No. 5, 18) for output. 6 is pin 1 of RJ-11 connector (5, 18), 7 is pin 4 of RJ-11 connector (5, 18), 8 is pin 2 of RJ-11 connector (5, 18) And 9 indicate pin 3 of RJ-11 connectors (5 and 18), respectively.

6 shows a system configuration diagram using the apparatus. The device 12 is placed between the telephone body 10 and the telephone voice recording equipment 23, and the device 19 includes RJ-11 connectors (4 and 17) for connecting the transceiver 14. As a result, it is not necessary to use a signal line branching device such as the T-tap 31.

8 is a circuit diagram of the transmission and reception volume control device. First, four branch signals for transmission and reception are branched from the RJ-11 Jack connected to the main body of the telephone, and the RJ-11 connector for the telephone receiver is connected to the input circuit of the telephone volume control device. The transmission signal is converted into an analog audio signal from which the DC component is removed through the T1 transformer and passed through the resistor R3. The received signal is converted into an analog voice signal from which the DC component is removed through the T2 transformer, and the received signal is attenuated so that the same volume as the transmitted signal can be maintained in the variable resistor VR1. The transmission signal passing through R3 and the reception signal passing through VR1 are combined at the OP1 input terminal, and the overall output gain adjustment according to the transmission distance is made through the feedback variable resistor VR2 of the inverting differential amplifier. The final output signal of OP1 is connected to pin 1 of RJ-11 connector 40 for the connection of telephone voice recording equipment. Power supplied from telephone voice recording equipment is 0V on pins 2 and 4 of RJ-11 connector and + 5V on pin 3.

As described above, the present invention can maintain the sound quality of the telephone voice recording equipment 23 at the sound quality obtainable from the telephone main body 10, and is a problem between the transmission and reception volume difference between the telephone and the recording equipment, which is a problem of the prior art. Low signal-to-noise ratio (SNR) along signal line length can be solved. In particular, it is possible to reduce the cost of the system by eliminating the need for expensive chips for voice processing such as DSP in the telephone voice recording equipment 23, and the complexity of the circuit by eliminating the telephone interface block and amplification stage in the recording board of the telephone voice recording equipment. Can be improved.

Claims (5)

A telephone transmission / reception volume adjusting device for branching transmission and reception signal lines from a main body of a telephone to adjust transmission / reception volume and output an amplified signal. A telephone transceiver interface block in parallel with an input transmission / reception signal line so as to connect the telephone transceiver to a transmission / reception volume adjusting device; An independent 1: 1 line matching block for interfacing the transmission signal with the apparatus; A receiver gain attenuation control block for attenuating the signal of the receiver based on the transmitter volume; A mixer and an output volume control block that combines the attenuated receiver signal and transmitter signal and adjusts the gain of the combined output signal; Telephone volume control device characterized in that the structure receives the power required by the device from the telephone voice recording equipment. The transmitter / receiver of claim 1, wherein the telephone transceiver interface block comprises a T-tap by processing two transmitter signal lines and two receiver signal lines branched from the main body of the telephone in parallel at the input / receive volume control device input terminal. Volume control device. The method of claim 1, wherein the volume level of the transmission / reception signal is adjusted by attenuation of the reception signal based on the transmission signal among the transmission / reception signals branched from the main body of the telephone to adjust the transmission / reception volume. Device. The apparatus of claim 1, wherein the output gain of the volume of the transceiver is controlled by the volume control block. The apparatus of claim 1, wherein the power of the transmission / reception volume adjusting device (19) is structured to be supplied from the telephone voice recording equipment (23).