WO2005071854A1

WO2005071854A1 - Transmission/reception circuit

Info

Publication number: WO2005071854A1
Application number: PCT/JP2004/000538
Authority: WO
Inventors: Shinji Seto; Yasutoshi Taniguchi
Original assignee: Nap Enterprise Co., Ltd.; School Juridical Person Of Fukuoka Kogyo Daigaku
Priority date: 2004-01-22
Filing date: 2004-01-22
Publication date: 2005-08-04

Abstract

A transmission/reception circuit includes a transmission section (7), a reception section (10), one microphone or a loudspeaker element (13), and a control circuit (20). The control circuit controls to switch between the transmission section and the reception section in such a manner that during a transmission when the microphone or the loudspeaker element performs the microphone function, the transmission switches of the transmission section and the reception section are ON and the reception switch is OFF while during a reception when the microphone the loudspeaker element performs the loudspeaker function, the transmission switches of the transmission section and the reception section are OFF and the reception switch is ON. Thus, it is possible to simplify the transmission/reception circuit and the reduce the circuit size and power consumption which have been impossible conventionally.

Description

Specification document Transmission / reception circuit

The present invention relates to a circuit capable of transmission and reception provided in a communication device capable of two-way communication, such as a cellular phone. Background art

Conventionally, in circuits capable of transmission and reception provided in communication equipment capable of two-way communication, two transmission amplifiers and two reception amplifiers are separately provided, and each is prepared as an amplification circuit having a dedicated function. (For example, Japanese Patent Application Laid-Open No. 2 0 2 0 3 0 0 7 4). Therefore, in the circuit described above, the number of parts constituting the circuit increases and the entire circuit becomes complicated, which is a major obstacle in achieving circuit miniaturization and power saving, particularly for mobile phones and the like. Problem.

Therefore, the present invention solves the above-mentioned conventional problems and combines one amplifier circuit with a transmitting amplifier circuit and a receiving amplifier circuit to simplify the circuit and reduce the size and power consumption. An object of the present invention is to provide a transmit / receive circuit that can be used. Disclosure of the invention

In order to achieve the above object, the transmission / reception circuit according to the present invention is a circuit capable of transmission / reception provided in a communication device capable of two-way communication, and a transmission switch and a reception switch are provided in series in a transmission section. In the receiver section, the receiver switch and the transmitter switch are provided in series, and the transmitter switch switches the transmitter switch. One amplifier circuit is provided with the input side as the reception side and the output side as the transmission side so as to connect between the reception side and the reception side and between the reception side and transmission side of the reception side. A single microphone or speaker element having a microphone function and a speaker function is provided to be able to switch between the microphone function and the speaker function so as to connect between the reception switch of the talk section and the transmission switch of the reception section. When the speaker element performs a microphone function, the transmitting switch of the transmitting section and the receiving section is turned on and the receiving switch is turned off, and when the microphone or speech force element performs a speaker function, the transmitting section and the receiving section are turned off. In particular, a control circuit is provided to switch and control the switches of the transmitting unit and the receiving unit so that the transmitting switch is turned off and the receiving switch is turned on. To.

Further, the transmission / reception circuit according to the present invention is a circuit capable of transmission / reception provided in a communication device capable of two-way communication, and a transmission switch and a reception switch are provided in series in the transmitter section. The receiver switch and the transmitter switch are connected in series, and one amplifier circuit is connected between the transmitter switch and the receiver switch of these transmitters and between the receiver switch and the transmitter switch of the receiver. The input side is provided as a receiver, and the output side is provided as a transmitter, and a speaker is provided at the receiver switch of the transmitter, and a microphone is provided at the transmitter switch of the receiver, and a microphone is provided. When the speaker function is on, the transmitter switch on the transmitter unit and receiver unit is on and the receiver switch on the receiver unit is off. When the speaker is on the receiver unit, the transmitter switch on the transmitter unit and receiver unit is off, the receiver switch is off. Tuchi is on A control circuit is provided to switch and control the switch between the transmitting unit and the receiving unit.

According to the present invention, it becomes possible to achieve simplification of the circuit and size reduction and power saving which can not be achieved conventionally in the transmission and reception circuit. Moreover, even if the switch is switched between transmitting and receiving, it is assumed that the direction of the signal passing through one amplifier circuit is constant. As a result, the loop for the oscillation phenomenon that often occurs in the conventional circuit is not formed, and therefore it is not necessary to take any special measures to prevent oscillation. In addition, since one microphone or speaker element is used to exhibit the microphone function and the speaker function (earphone function) respectively, the configuration is further simplified. Brief description of the drawings

FIG. 1 is a block diagram of a transmission / reception circuit incorporated in a communication device capable of two-way wireless communication as an embodiment of the present invention. FIG. 2 is a schematic block diagram of a microphone or a speaker element. FIG. 3 is a drawing showing the switch setting of the transmitting switch and the receiving switch provided in the transmitting unit and the receiving unit of the above. FIG. 4 is a block diagram of a transmitting / receiving circuit incorporated in a communication device capable of two-way radio communication as another embodiment. FIG. 4 is a block diagram of the present invention.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. This embodiment is applied to a communication device (for example, a mobile phone) capable of two-way wireless communication. Fig. 1 is a circuit block diagram of a transmitting / receiving circuit incorporated in a wireless communication device capable of two-way communication. In this drawing, a battery for performing the operation of the circuit, etc. is not required to be described. Omitted

Reference numeral 1 denotes a communication device capable of two-way wireless communication, and includes a transmitting / receiving antenna 2. The transmission terminal of the communication device 1 has a filter 3 for removing a switch driving frequency component (driving pulse) at the time of transmission, a transmitting switch 4, a receiving switch 5, a switching drive frequency component at the receiving end (driving pulse ) To remove The fil- ters 6 are provided in series in series. The transmitter section 7 is composed of these two filters 3, 6 and both switches 4, 5. Also, on the receiving terminal, receiving switch 8 and transmitting switch 9 are sequentially connected in series. The receiver 10 is configured by these two switches 8 and 9. One amplification circuit 12 connects the input side to the reception section 10 so as to connect between the transmission switch 4 and the reception switch 5 of the transmission section 7 and between the reception switch 8 and the transmission switch 9 of the reception section 10 As a transmitter 7. A microphone or speaker force element (MICZSP) 13 is integrated so that the microphone function and the speaker function are integrated so as to connect between the transmitter 6 of the transmitter 7 and the transmitter switch 9 of the receiver 10 There is.

As shown in FIG. 2, the microphone or the speaker element 13 has one diaphragm 15 shared with the microphone function and the speaker function on the main body 14, and the microphone or the motive force element is provided by driving means (not shown) provided on the main body 14. When 13 is made to function as a microphone, a signal such as voice input as arrow A is transmitted to diaphragm 15 to make it change its vibration and make it sound, while making microphone or speaker element 13 function as a speaker A signal such as voice collected as shown by arrow B is taken out as an output signal by the change in vibration of the diaphragm 15 (different from the vibration at the time of the microphone function). The driving means may be any of a coil, an electromagnetic stone, a crystal (crystal), and a capacitor. The point is that when one common diaphragm 15 is used to exhibit either a microphone function or a speaker function, different vibrations occur. You should be able to wake up. In order to be able to switch between the microphone function and the speaker function, as shown in FIG. 1, a microphone or a speaker element (M I C / S P) switching circuit 17 is connected to the microphone or the speaker element 13.

A control circuit 20 controls on / off of switches 4, 5, 8 and 9 of the transmitting unit 7 and the receiving unit 10 by generating clock pulses. There is. The control circuit 20 comprises first and second switch drive circuits 21 and 22, a flip flop circuit 23, and an oscillation circuit 24. The first switch drive circuit 21 is connected to the transmitter switches 7 and the transmitter switches 4 and 9 of the receiver unit 10, and the second switch drive circuit 22 is for the transmitter unit 7 and the receiver 10 of the receiver switch 5, Connected to 8 The flip-flop circuit 23 is connected to both switch drive circuits 21 and 22, and when the microphone or the slider 13 performs a microphone function, the transmitter switches 7 and the transmitter switches 4 and 9 of the receiver 10 are turned on. When the reception switch 5 or 8 is off and the microphone or speaker element 13 performs the speaker function, the transmission switch 7 of the transmission section 7 and the reception section 10 of the reception section 10 is off, the reception switch 5 or 8 Is switched on so that both switch drive circuits 21 and 22 are not switched on or off at the same time. Figure 3 shows the switch timings of the transmitter switches 4 and 9 and the receiver switches 5 and 8 of the transmitter 7 and receiver 10. Also, a clock oscillator circuit 24 is connected to the flip flop circuit 23 so as to operate the flip flop circuit. Next, the operation will be described. When transmitting, the control circuit 20 turns on the sending switches 4 and 9 of the transmitting unit 7 and the receiving unit 10 and turns off the receiving switches 5 and 8 while the switching circuit 17 turns off the microphone or the speaker. The force element 13 is made to function as a microphone. In this state, the amplification circuit 12 is used for transmission, and a signal such as voice taken in and input from the microphone or speaker element 13 passes through the transmission switch 9 and the amplification circuit 12 to transmit the speech switch 4. Further, the filter driving frequency component is removed by filter 3 and sent to the transmitting terminal, and transmitted from the transmitting / receiving antenna 2 of the communication device 1.

When receiving a call, the control circuit 20 turns off the sending switches 4 and 9 of the sending unit 7 and the receiving unit 10 and turns on the receiving switches 5 and 8 while the switching circuit 17 turns the microphone or speaker element 13 into a speaker. Make it function as In this state, the amplifier circuit 12 is used for receiving calls, and the transmitting / receiving antenna of the communication device 1 is used. Signals such as voices received and input at 2 are sent to the receiver switch 5 through the receiver switch 8 and the amplifier circuit 12, and the filter drive frequency component is removed at the filter 6, and the microphone or speaker device 13 is obtained. Then, the microphone or speech force element 13 functions as a speech force to spread the speech information. At this time, if the repetition frequency of the sending switch 4 and 9 and the receiving switch 5 and 8 is switched from 20 kHz to 30 Khz sufficiently higher than the voice frequency, then the sending circuit and the receiving circuit are operating simultaneously. It is possible to make two-way calls freely.

FIG. 4 shows another embodiment. In this embodiment, the microphone and the spy force are not separately integrated as in the microphone or spy force element 13 described above, but are separately provided in consideration of the need to be used separately. That is, a speaker (S P) 28 is connected to the filter 6 of the transmitter 7 and is provided, and a microphone (M I C) 27 is connected to the transmitter 9 of the receiver 10. The configuration other than this is the same as that of the above-described embodiment, so the same reference numerals are given to the same parts and the description will be omitted. The switch timings of the transmitter switches 4 and 9 of the transmitter unit 7 and the receiver unit 10 and the receiver switches 5 and 8 are as shown in FIG. 3 and are the same as those of the above embodiment.

Also in this embodiment, the same action as in the above embodiment can be expected. That is, when transmitting, the transmitting circuit 7 and the transmitting switches 4 and 9 of the receiving unit 10 are turned on by the control circuit 20, and the receiving switches 5 and 8 are turned off. In this state, the amplification circuit 12 is used for transmission, and a signal such as voice taken in and input from the microphone 27 is sent through the transmission switch 9 and the amplification circuit 12 to the transmission switch 4 and then the fill In the evening 3, the switch driving frequency component is removed and sent to the transmitting terminal, and transmitted from the transmitting / receiving antenna 2 of the communication device 1. When receiving a call, the control circuit 20 controls the transmission section 7 and the reception section 10 to transmit 4 , 9 off, receiver switch 5, 8 on. In this state, the amplifier circuit 12 is used as a receiver, and a signal such as voice received and input by the transmission / reception antenna 2 of the communication device 1 is sent to the receiver switch 5 through the receiver switch 8 and the amplifier circuit 12. The filter drive frequency component is removed at filter 6 and sent to the speaker 28 to amplify the voice information.

In the case of the communication equipment having the same two-way communication function without the same transmission / reception circuit as in this embodiment, the two-way communication itself has no problem, but the same transmission / reception circuit is provided. In this case, if there is a match or slight deviation between the transmission / reception control timing frequencies of both communication devices, it may be impossible to make a call. In such a case, the other party's switching component It must be removed by the side filter and sent.

Although in the embodiment of FIG. 1 the speech power function is used to receive the microphone or speech force element 13, this may be an earphone function. Although the embodiment of FIG. 4 also uses the speaker 28 for reception, it may be an earphone. Further, the specific circuit configuration of the control circuit 20 for controlling the transmission switch and the reception switch is only a preferable example, and another circuit configuration may be used as long as it has the same effect. Furthermore, in the embodiment, a mobile phone is taken as an example of the communication device 1. However, the present invention is not limited to this and it is needless to say that other two-way communication devices may be used.

Claims

1. A circuit capable of transmission and reception provided in a communication device capable of two-way communication, in which a transmission switch and a reception switch are provided in series in a transmission section, and a reception switch and a reception switch in the reception section. A transmission switch is provided in series, and the transmission ports of these transmission sections

Request for talks between talks and talks and talks between talks and talks

One amplification circuit connects the receiver to the receiver and the transmitter to the transmitter.

A single microphone or speaker element with a microphone function and a speaker function turns off the microphone surrounding function and the speaker function so that the receiving section of the transmitting section and the transmitting switch of the receiving section are connected. When the microphone or the speaker element performs the microphone function, the transmitting switch of the transmitting part and the receiving part is turned on, the receiving switch is turned off, and the microphone or the splaying element is a speaker function. The control circuit is provided to switch and control the switches of the transmitting unit and the receiving unit so that the transmitting switch of the transmitting unit and the receiving unit is turned off and the receiving switch is turned on. Transmission / reception circuit to be used.

2. The transmission / reception dual-purpose circuit according to claim 1, further comprising a switching circuit that switches between the microphone function and the speaker function of the microphone or the spy force element.

3. The sound insulation wall in which the earphone function is provided instead of the speaker function of the microphone or the speaker element is characterized in that the sound insulation wall on the tip side is gradually reduced in diameter. The transmission / reception dual-use circuit according to claim 1.

4. A circuit capable of transmission and reception provided in a communication device capable of two-way communication, in which a transmission switch and a reception switch are provided in series in the transmission section, and a reception switch and a transmission switch in the reception section. Installed in series, these transmitters One amplifier circuit is provided with the input side as the receiving side and the output side as the transmitting side, so as to connect between the talking switch and the receiving switch and between the receiving switch of the receiving section and the transmitting switch. A speaker is provided at a receiver switch of the transmitter unit, a microphone is provided at a transmitter switch of the receiver unit, and when the microphone functions, the transmitter switch of the transmitter unit and the receiver unit is turned on, and the receiver switch is made. A control circuit that switches and controls the switch of the transmitting unit and the receiving unit so that the switch of the transmitting unit and the receiving unit is turned off and the receiving switch of the receiving unit is turned on. A transmitter / receiver circuit characterized by the provision of

5. The transmitting / receiving circuit according to claim 4, wherein an earphone is provided instead of the speaker.

6. The first switch driving circuit that turns on / off the sending switch of the sending section and the receiving section, and the second that turns on / off the receiving switch of the sending section and the receiving section by the control circuit. The flip-flop circuit is operated to alternately switch on and off so that the switch drive circuit and the first and second switch drive circuits are not simultaneously turned on or off. The transmitting and receiving circuit according to claim 1, characterized by comprising an oscillating circuit to be driven.

7. A filter for removing a switching drive frequency component from a transmission signal at the time of transmission and a filter for removing a switching drive frequency component from a reception signal at the time of reception are provided. The transmitter / receiver circuit described.