JPS61242444A - Telephone set for automobile - Google Patents

Abstract

PURPOSE:To attain the external extension of a hand-free function by providing an external speech path switch which connects a hand-free speech path to an external hand-free control part when a hand-free signal is detected. CONSTITUTION:When data from a data detection part 3 is data on the on/off operation of the hand-free speech path 8, the external speech path switch 14 is switched according to this signal; when the hand-free speech path is turned on, the hand-free speech path 8 is connected to an external hand-free control part 2. Further, when the hand-free speech path is off, the hand-free speech part 8 is connected to the speech path switch 15 of a handset 13. Thus, when hand-free operation is selected, the hand-free control part 2 connected to the outside operates and when the hand-free operation is not selected, the hand-free control part 4 of the handset 13 operates.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a car telephone having a handset with a built-in hands-free function.

[Conventional technology]

FIG. 2 is a block diagram of a conventional car phone. In FIG. 0, 1 is a radio device, and 4 is a hand that prevents cowling by giving a loss to either the input from the micro or the output to the speaker 7. 15 is an audio path switch provided between the hands-free control unit 4 and a hands-free audio path 8 to be described later; 5 is an audio path control unit that performs switching control of the audio path switch 15; is the above-mentioned hands-free control section 4. Audio path control unit 5. Audio path switch 1
5. This is a handset with a built-in micro and speaker 7. Further, 8 is a hands-free audio path connecting the radio device 1 and the handset 13, and 9 is a data line. In addition to the hands-free audio path, there are other audio paths mentioned above.
Illustration is omitted here.

Next, the operation will be explained.

The audio path control section 5 receives data for switching the audio path from the radio device 1 via the data line 9. When the audio path control section 5 receives the data to select the hands-free audio path 8, the control section 5 switches the audio path switch 15 accordingly, and thereby the hands-free control section 4 and the hands-free audio Route 8 is connected.

[Problem that the invention seeks to solve]

Conventional car telephones are configured as described above, so when extending the hands-free function externally, that is, when performing the hands-free function on the outer part of the handset 13, an external microphone and speaker must be connected to the handset. Although this method allows the hands-free function to be extended externally, there is a problem in that it causes a serious problem in that the handset cannot be used.

This invention was made to solve the above-mentioned problems, and when performing hands-free functions using an external microphone or speaker, it is possible to stop the hands-free function by the hands-free circuit built into the handset. The object of the present invention is to obtain a car telephone whose hands-free function can be extended externally without causing any trouble during use.

[Means for solving problems]

A car telephone according to the present invention includes a cradle inserted between a radio and a hand center, and a terminal for connecting an external microphone and a speaker in the cradle, and a hands-free signal for performing hands-free operation. The device includes a detection unit for detecting a hands-free signal and an external audio path switch that connects the hands-free audio path to an external hands-free control unit when a hands-free signal is detected.

[Effect]

In the car phone according to the present invention, when the data detection section detects the hands-free line selection signal, the external voice path switch connects the hands-free voice path to the external hands-free control section, thereby operating the external hands-free circuit. However, the function of the hands-free circuit built into the handset is stopped, and as a result, the hands-free function is extended to the outside.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an embodiment of the present invention. In the figure, 1 is a radio device, 2 is an external microphone, an external hands-free control unit for preventing cowling caused by a speaker, and 3 is a data transfer unit for transmitting data from the radio device l. A data detecting section receives the hands-free line selection signal via the line 9 and detects a hands-free line selection signal which is a signal to select the hands-free speech path 8; 14 is an external audio path switch controlled by the data detecting section 3; External hands-free control section2. A cradle 12 is constituted by the data detection section 3 and the external audio path switch 14. The handset 13 also has a hands-free control section 4. Audio path switch 15. an audio path control section 5 for controlling switching of the switch 15; It is composed of a micro and a speaker 7.

Next, the effects will be explained.

The data detection unit 3 receives the audio path selection signal from the radio 1 via the data line 9 in parallel with the audio path control unit 5,
If the data relates to on/off of the hands-free audio path 8, the external audio path switch 1
4 is switched and the hands-free audio path is on, the hands-free audio path 8 is connected to the external hands-free controller 2.

Further, when the hands-free audio path is off, that is, when the data detection unit 3 does not detect the hands-free audio path selection signal,
The hands-free audio path 8 is connected to an audio path switch 15 of the handset 13.

As described above, in this embodiment, when the hands-free operation is selected, the externally connected hands-free control section 2 operates, and when the hands-free operation is not selected, the hands-free control section 4 of the handset 13 operates. The hands-free function can be extended externally, and there is no problem when using the handset.

〔Effect of the invention〕

As described above, according to the car phone according to the present invention,
A cradle is inserted between the radio and the handset, and the cradle includes a terminal for connecting an external microphone and speaker, a detection section for detecting a hands-free selection signal for performing hands-free operation, and a hands-free selection. An external audio path switch was provided to connect the hands-free line to the external hands-free control when a signal was detected.
Even in hand cents with a built-in hands-free function, the hands-free function can be extended to the outside by simply adding a cradle.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a car phone according to an embodiment of the present invention, and FIG. 2 is a block diagram showing a conventional car phone. In the figure, 1 is a radio, 2 is an external hands-free control section, 3 is a data detection section (signal detection section), 8 is a hands-free audio path, 10 is an external microphone terminal, 11 is an external speaker terminal, 12 is a cradle, 13 is a hand center, and 14 is an external audio path switch. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] (1) In a car phone equipped with a radio and a handset with a hands-free function, an external microphone terminal and an external speaker terminal are provided between the radio and the handset to prevent cowling. a control unit, a signal detection unit that detects a hands-free selection signal for selecting a hands-free audio path, and an external audio device that connects the hands-free audio path to the external hands-free control unit when the hands-free selection signal is detected. A car telephone characterized in that a cradle consisting of a road switch is inserted and connected.