KR950011081B1 - The cordless phone hand free method - Google Patents

Abstract

The hand free circuit is equipped in a hand set of a wireless phone instead of base station. The circuit comprises a hand free audio signal receiver(43) for processing received audio signal, a hand free audio signal transmitter(46) for processing voice signal detected by a microphone, and analog switches(B, B') for connecting hand free audio signal receiver and transmitter.

Description

Hand-Free Calling Device for Cordless Phone Handheld Device

1 is a block diagram of a wireless telephone of the prior art, in which FIG. 1 (a) is a block diagram of a portable device, and FIG. 1 (b) is a block diagram of a fixed device.

FIG. 2 is a block diagram of a radiotelephone according to the present invention. FIG. 2 (a) is a block diagram of a portable device, and FIG. 2 (b) is a block diagram of a fixed device.

* Explanation of symbols for main parts of the drawings

43: Audio receiver B, B ', F, F' for handfree mode: Analog switch

46: audio transmitter for hand-free mode

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a portable handset of a cordless phone, in particular, a hand free call of a portable handset of a cordless handset for providing convenience to a call when the handheld device is on a charger away from a fixing device or when a user wears a belt clip or the like. Relates to a device.

1 (a) to 1 (b) are block diagrams for explaining a hand free function in a conventional wireless telephone. In FIG. 1 (a), the portable device has a transmission path leading to the microphone 17, the audio transmitter 16, the RF transmitter 15, and the antenna 11, and from the antenna 11 to the RF receiver 12; It has a reception path leading to the audio receiver 13 and the speaker 14, and includes a control unit 18 for controlling the transmission and reception operation.

In FIG. 1 (b), the fixing device has a transmission circuit connected to a telephone circuit 24, an audio transmitter 26, an RF transmitter 25, and an antenna 21 connected to telephone lines T and L. A reception path from 21 to an RF receiver 22, an audio receiver 23, and a call circuit 24; and a control unit 28 for controlling the transmission / reception operation, and the RF receiver 22 Loudspeaker circuit section 31 connected to the audio receiver 23 and the RF transmitter 25 and the audio transmitter 26 to be interlocked to perform a hands-free function according to the switching state. ) And the hand-free circuit unit 30 including the speaker 32 and the microphone 33 can be selected.

The transmission / reception operation by the portable apparatus of the prior art configured as described above is performed as follows. First, during a trunk line call in a portable device, the voice signal is converted into an electrical signal by the microphone 17 of the portable device, and is modulated by the RF transmitter 15 to obtain gain and frequency characteristics required by the audio transmitter 16. The RF signal is amplified and transmitted to the processing apparatus through the antenna 11. At this time, the modulated signal received through the antenna 21 of the fixed device is detected by the RF receiver 22 and obtains the required frequency characteristics from the audio receiver 23 through the switch (A) to the telephone line (24) T, L) and sent.

In the sign language path, the signal coming into the telephone lines T and L is amplified by the audio transmitter 26 through the call circuit 24 of the fixed device, modulated by the RF transmitter 25, and then carried by the portable device through the antenna 21. The modulation signal received through the antenna 11 of the portable device is detected by the RF receiver 12 and then amplified by the audio receiver 13 to drive the speaker 14.

On the other hand, in the fixed device, the switching terminal of the analog switch (A) (A ') connected between the RF transmitter / receiver 25 (22) and the audio transmitter / receiver 26 (23) during hand-free call operation is a hand. It is connected to the pre-circuit unit 30 to switch the transmission and reception paths. In the case of a transmission, the voice signal input from the microphone 33 of the hand-free circuit unit 30 is converted into an electric signal, and then the speakerphone circuit unit 31 and the audio are transmitted. Amplified by the receiver 23, and connected to the telephone line (T, L) through the telephone circuit 24, and in the case of sign language, the signal input through the telephone circuit 24 from the telephone line (T, L) is audio The speaker 32 is input to the speaker phone circuit 31 through the transmitter 26 to drive the speaker 32.

However, since the hands-free call operation is limited to the fixed device, there is a problem in that when the user moves the mobile device away from the fixed device and uses the portable device on the charger, the user cannot carry the mobile device and make a hand-free call.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a hand-free calling device for a wireless telephone handheld device, which can increase the convenience of using a wireless phone by allowing hand-free calls through the mobile device. There is this.

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

2 (a) to 2 (b) are block diagrams of a wireless telephone according to the present invention, and FIG. 2 (a) is a block diagram of a portable device, and FIG. 2 (b) is a block diagram of a fixing device. . The portable device has a transmission path through the microphone 17, the audio transmitter 16, the RF transmitter 15, and the antenna 11, and the RF receiver 12, the audio receiver 13, and the speaker 14 from the antenna 11. It has a control unit 18 for controlling the transmission and reception operation while having a reception path leading to a), the hand-free mode audio receiver 43 and the hand-free mode for amplifying the voice signal with high gain during a hand-free call The mode audio transmitter 46 is provided, and the audio transmitter / receiver 16 and 13 and the handsfree mode audio transmitter / receiver 46 and 43 are connected by analog switches B and B '. Is selected. In addition, the fixing device includes a communication circuit 24 connected to telephone lines T and L, an audio transmission / reception unit 26, 23, and an RF transmission / reception unit 25, 22, and an antenna 21. A control unit 28 is provided to control the transmission / reception operation while providing a reception path, and the speakerphone circuit unit 30 is connected to the RF transmission / reception unit 25 and 22 side by using analog switches F and F '. It is supposed to connect.

Referring to the operation and effect of the present invention configured as described in detail as follows.

In the general call mode using the portable device, the analog switch (B) (B ') of the portable device connects the RF receiver 12 and the audio receiver 13 and at the same time the RF transmitter 15 and the audio transmitter. In the state of connecting 16, the call is operated in the same manner as in the case of the trunk line call of the portable apparatus as described above.

In the case of a hand-free call mode using a portable device, the portable device is connected to an RF switch 12 at the same time that the analog switch B (B ') connects the RF receiver 12 and the audio receiver 43 for hand-free mode. 15) make a call while connecting the audio transmitter 46 for hand-free mode. At this time, when the portable device transmits a voice signal, the voice is converted into an electrical signal by the microphone 17 of the portable device, and the audio transmission unit 46 for hand-free mode (amplification gain is larger than the audio transmitter 16). Amplified by high gain and then modulated by the RF transmitter 15 and transmitted to the high and low device side through the antenna 11, wherein a signal received through the antenna 21 of the fixed device is demodulated by the RF receiver 22. Then, it is output to the telephone line (T, L) side via the audio receiver 23 and the call circuit 24. In addition, when the portable apparatus receives a voice signal, when the voice signal is input to the call circuit 24 from the telephone lines T and L, the voice signal is amplified by the audio transmitter 26 and then the RF transmitter 25 Is modulated by the antenna 21 and transmitted to the portable device, wherein a signal received through the antenna 11 of the portable device is demodulated by the RF receiver 12. Amplification gain is larger than that of (13), and is amplified with high gain and output to the speaker 14 side.

That is, when making a hand-free mode call using a portable apparatus, the hand-mode audio receiver 46 amplifies the voice signal being transmitted by the hand-free mode audio transmitter 46 with high gain and simultaneously receives the received voice signal. 43, amplification with high gain enables communication from a position away from the portable device even if the user does not hold the portable device by hand.

On the other hand, when making a hand-free call with a trunk line using a fixed device, the analog switch F (F ') connects the audio receiver 23 and the audio transmitter 26 to the speakerphone circuit unit 30 side. To make a call, a voice signal input from the telephone lines T and L to the call circuit unit 24 is amplified by the audio transmitter 26 and then output to the user through the speakerphone circuit unit 30, and the user is connected to the speakerphone circuit unit. The audio signal inputted at 30 is amplified by the audio receiver 23 and then output to the telephone line T, L side via the telephone circuit 24. In the case of hand-free communication with the portable apparatus using a fixed device, the analog switch F (F ') connects the RF receiver 22 and the RF transmitter 25 to the speakerphone circuit unit 30. In the call, the RF signal received by the RF receiver 22 and demodulated from the portable device through the antenna 21 is output to the user through the speakerphone circuit unit 30, the user is the speakerphone circuit unit 30 The audio signal input to is modulated by the RF transmitter 25 and transmitted to the portable apparatus through the antenna 21.

As described above, the present invention can perform the hand-free call function not only in the fixed device but also in the portable device, so that the user can talk in the hand-free mode using the mobile device at any place away from the fixed device. It is possible to greatly improve the convenience of.

Claims (1)

An RF receiver 12 for demodulating a signal applied through the antenna 11 and outputting a received voice signal; an audio receiver 13 for amplifying the received voice signal and outputting the received voice signal to a speaker 14; 17. A portable telephone apparatus having an audio transmitter 16 for amplifying and outputting a transmission voice signal applied from 17) and an RF transmitter 15 for modulating the transmission voice signal and transmitting it through an antenna 11. And a hand free mode for high gain amplifying the received voice signal and outputting the received audio signal to the speaker 14 and a hand gain mode for high gain amplifying and transmitting the transmitted voice signal applied from the microphone 17. Audio transmitter 46, an analog switch B for selectively connecting the RF receiver 12 to the audio receiver 13 and an audio receiver 43 for hand-free mode, and the RF transmitter 15 Remind And an analog switch (B ') selectively connected to the audio transmitter (16) and the audio transmitter (46) for hand-free mode.