JPH0739156U - Hands-free communication device - Google Patents

Abstract

(57) [Abstract] [Purpose] In cordless home telephones having a plurality of cordless handsets, in cordless home telephones, the extension of the cordless handsets is aimed at in extension telephone communication between cordless handsets, and the hands-free I
The purpose is to reduce the total use of C. [Structure] A hands-free circuit 11 is provided in the connecting portion 2a of the base unit.
Is provided. In the connection portion 2a of the base unit 2, the handset 1a
The radio wave from the receiver 9 is received by the receiving unit 9, and the amplifier 10 → switch circuit 11a → hands-free IC 11b → switch circuit 11a → amplifier 12 → hybrid 13 → amplifier 14 →
The audio signal that has passed through the switch circuit 11c → hands-free IC 11b → switch circuit 11c → amplifier 15 is transmitted from the transmitter 16. The receiver 1b on the receiving side receives this radio wave. That is, the function of the handsfree IC 11b determines that the communication is from the handset 1a to the handset 1b and transfers the reception from the handset 1a to the handset 1b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hands-free communication device having an extension talkback function used for a cordless home telephone composed of a plurality of cordless telephones, a cordless handset and a base unit.

[0002]

[Prior art]

 Figure 3 shows a cordless home telephone consisting of multiple handsets, which are cordless phones, and a base unit. Mutual extension calls between a plurality of slave units 1a and extension calls between these slave units 1a and base unit 2 are being performed.

Conventionally, in a hands-free communication device used for a cordless home telephone or the like having this type of cordless handset, a hands-free IC has been mounted on the cordless handset side in order to realize extension communication between cordless handsets. . An extension call between these slaves will be described below with reference to FIG. Each child device is provided with a hands-free circuit 21 including a hands-free IC 21b and switch circuits 21a and 21c. For example, when making an extension call from the handset 1a to the handset 1b, a voice signal via the microphone 3 of the handset 1a on the transmitting side → the amplifier 4 → the switch circuit 21a → the handsfree IC 21b → the switch circuit 21a Is transmitted from the transmitter 5. In the slave unit 1b on the receiving side, the receiving unit 6 receives the wave, and the sound is output via the switch circuit 21c → hands-free IC 21b → switch circuit 21c → amplifier 7 → speaker 8. That is, when an extension call is made from the handset 1a to the handset 1b, the handset 1b, which receives the radio wave from the handset 1a, indicates that the handset-free communication is addressed to itself by the handset-free IC 21b. It is possible to make a call and make a call with the handset 1a.

[0004]

[Problems to be solved by the device]

 However, with the downsizing of mobile devices in recent years, it has become physically impossible to mount a hands-free IC and its peripheral circuits on the mobile device. Further, in the conventional hands-free communication device in which the hands-free IC is mounted on the slave side, there is a problem that the hands-free ICs are required according to the number of slaves.

The present invention has been made in view of the above circumstances, and provides a hands-free communication device in which the use of ICs for hands-free is comprehensively reduced as well as the miniaturization of a handset. With the goal.

[0006]

[Means for Solving the Problems]

 In order to solve the above problems, the hands-free communication device according to the present invention is a hands-free communication device having an extension talkback function used for a cordless home telephone including a plurality of cordless telephones, a cordless handset and a master device. The feature is that the IC for Lee is not mounted on the cordless home telephone handset side but on the base side.

[0007]

[Action]

 By implementing a hands-free IC on the base unit side of a cordless home telephone, extension talkback can be realized in a downsized handset unit. In addition, the extension talkback function can be shared by multiple slave units that are multi-connected to the master unit.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the constitutional requirements of the hands-free communication device according to the present invention. In the figure, 1, 1a, ... are slaves, 2 is a master, 2a is a connection part of the master 2, 3 is a microphone on the slave side, 19 is a microphone on the master 2, and 4 and 7 are on the slave side. Amplifiers 10, 12, 14, and 15 are amplifiers of the connection unit 2a, 18 is an amplifier of the master unit 2, 5 is a transmitter unit of the slave unit, 16 is a transmitter unit of the connector unit 2a, and 6 is a receiver unit of the slave unit. , 9 is a receiver of the connection unit 2a, 8 is a speaker on the handset side, 11 is a hands-free circuit, 11a and 11c are switch circuits, 11b is a hands-free IC, and 13 and 17 are hybrids. Here, by mounting the hands-free circuit 11 at the point of the connecting portion 2a in the figure, half-duplex call for extension talkback is realized.

FIG. 2 is a diagram for explaining an extension call between mutual cordless handsets according to the present invention. In the figure, the master unit is provided with a hands-free circuit 11 including a hands-free IC 11b and switch circuits 11a and 11c. When making an extension call from the handset 1a to the handset 1b, in the connection part 2a of the base unit 2 which receives the radio wave from the handset 1a, the receiving part 9 receives the wave and the amplifier 10 → the hands-free circuit 11 Switch circuit 11a → hands-free IC 11b → switch circuit 11a → amplifier 12 → hybrid 13 → amplifier 14 → switch circuit 11c of hands-free circuit 11 → hands-free IC 11b → switch circuit 11c → audio signal via amplifier 15 Is transmitted from the transmission unit 16. The receiver 1b on the receiving side receives this radio wave. That is, when an extension call is made from the handset 1a to the handset 1b, at the connection part 2a of the base unit 2 which receives the radio wave from the handset 1a, the handset-free IC 11b causes the handset 1a to reach the handset 1b. The communication from the child device 1a is determined to be transmitted to the child device 1b. On the side of the slave unit 1b that receives the radio wave from the connection unit 2a of the master unit 2, it is possible to talk with the slave unit 1a by the function of the hands-free IC 11b of the connection unit 2a of the master unit 2.

In the figure, since the transmission level in the transmission unit 5 of the cordless telephone slave unit 1 and the transmission level in the reception unit 9 of the connection unit 2a of the master unit 2 are specified, the plural telephone type ( The conventional method can be applied to the hands-free design method for home telephones with a large number of cordless handsets for one connection unit.

[0011]

[Effect of device]

 As described above, in the hands-free communication device of the present invention, the handsfree IC is not mounted on the cordless home telephone side but mounted on the master side, so that the cordless telephone is a cordless telephone with a limited mounting space. In addition, by realizing an extension talkback, and in a multi-phone home telephone, by mounting a hands-free IC only at the connection part of the master device, Thus, the talkback function can be shared.

[Brief description of drawings]

FIG. 1 is a block diagram showing configuration requirements of a hands-free communication device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining an outline of an extension telephone call between the handset units according to the present invention.

FIG. 3 is a block diagram showing a configuration of a cordless home telephone.

FIG. 4 is an explanatory diagram for explaining an extension call between handset units in a conventional example.

[Explanation of symbols]

 1, 1a, ... Slave device 2 Master device 2a Connection part 3,19 Microphone 4,7,10,12,14,15,18 Amplifier 5,16 Transmission part 6,9 Reception part 8 Speaker 11,21 Hands-free circuit 11a , 11c, 21a, 21c Switch circuit 11b, 21b Hands-free IC 13,17 Hybrid

Claims (1)

[Scope of utility model registration request] 1. In a hands-free communication device having an extension talkback function used for a cordless home telephone composed of a plurality of cordless telephones and cordless home telephones, a hands-free IC is provided on the cordless home telephone cordless handset side. Hands-free communication device characterized by being mounted on the base unit side without mounting.