JPH01212949A - Hand-free telephone system - Google Patents

Abstract

PURPOSE:To enable a talker to close and connect or open a line without operating a button by providing a first detecting means to detect an incoming signal from the line, and a second detecting means to detect the end of speech between the line and a speaker and a hand-free microphone. CONSTITUTION:A signal from the light receiving part of the photocoupler 1a of an incoming detecting means 1 is monitored and when the signal is inputted, the frequency and the period of it are compared respectively with the frequency and the period of the incoming signal set previously in a storage part 6d, and it is discriminated whether an incoming call arrives or not. When incoming call arrives, a trunk line is closed and connected, and a hand-free circuit part 5a is started. Next, the signal from the emitter of the transistor(TR) TR3 of an end of speech detecting means 4 is monitored, and when an intermittent sound is inputted, it is discriminated whether it is the end of the speech or not by comparing its number of times with the number of times of the intermittent sound previously set in the storage part 6d, and the TR2 is turned off, and the trunk line is opened, and besides, the operation of the hand-free circuit part 5a is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a handset-free telephone device that allows a caller to make a call without having to hold a handset in his or her hand.

BACKGROUND AND TECHNOLOGY Traditionally, this type of hands-free telephone equipment has been used to close central office lines,
It is equipped with a button to release the telephone, a loudspeaker for receiving the voice of the other party separately from the receiver, and a microphone for transmitting the voice from the own station to the other party separately from the transmitter.

In the conventional example above, when a call arrives from the central office line, the caller:
By operating the above-mentioned button, the central office line can be closed, and therefore a call can be made using the loudspeaker and microphone without having to hold the handset in hand.

Furthermore, by operating the above button again after the call ends, the central office line can be released.

Problems to be Solved by the Invention However, since the above-mentioned conventional hands-free telephone device closes and opens the central office line by pressing a button, it is not completely hands-free, and therefore is particularly difficult for people with disabilities in their limbs. The problem is that it is inconvenient for people.

SUMMARY OF THE INVENTION In view of the problems of the prior art described above, it is an object of the present invention to provide a hands-free telephone device that allows a caller to close and open a line without operating a button.

Means for Solving the Problems In order to achieve the above objects, the present invention includes a first detecting means for detecting an incoming signal from one line, and detecting an end call between the line and a hands-free speaker and microphone. and a second detection means for closing the line to form a communication path between the line and the speaker and microphone when the first detection means detects an incoming signal from the line; The line is opened when the detection means detects the end of the call.

Effect: With the above configuration, the present invention can automatically close and open the line by the first detection means and the second detection means, respectively, so that one caller can connect the line without operating a button. can be closed and opened.

EXAMPLES Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic block diagram showing an embodiment of a free telephone device according to the present invention, and FIG.

FIG. 3 is a detailed block diagram of the hands-free telephone device shown in FIG. 1, and a flowchart for explaining the operation of the hands-free telephone device shown in FIG.

In FIG. 1, 1 represents an incoming signal from a central office line (for example, 1
6Hz) and outputs the detection signal; 2 is a central office line closing/opening means for closing and opening the central office line; 3 is a single central office line and a hands-free circuit 5 or will be described later. A communication path unit 4 for forming a communication path between the handset and the handset is a communication path unit that emits an intermittent tone that is transmitted through the central office line to indicate the end of the call when the central office line is opened by the other party's telephone. 3 and 6 control the central office line closing/opening means 2 and the hands-free circuit 5 based on the incoming call detection signal from the incoming call detection means 1 and the end of call detection signal from the end of call detection means 4. This is the control section.

As shown in FIG. 2, the hands-free circuit 5 includes a speaker 5b and a microphone 5C, which allow the caller to make a call without holding the handset in hand, and amplifies the input signal of the speaker 5b and the output signal of the microphone 5C. The hand-free circuit section 5a includes an equivalent circuit.

In FIG. 2, the incoming call detection means 1 includes a photocoupler 1a that detects an incoming signal from a central office line and outputs the detection signal from a light receiving section to an input section 6a of a control section 6, and an incoming call at a predetermined voltage μ. Zener diodes 1b and 1 for detecting the signal
It is composed of an incoming call circuit IC, etc., which rings the speaker 5b to call the caller in response to an incoming call signal, and the central office line closing/opening means 2 is turned on and off by a control signal from the output section 6a of the control section 6. The transistors Tr1. It is composed of Tr2 and the like.

The end-of-call detection means 4 is composed of a capacitor C, a transistor Tr3, etc. for detecting the intermittent sound sent from the office line through the communication path section 3, and a signal from the emitter of the transistor Tr3 is input to the control section 6. It is output to section 6b.

The control section 6 is constituted by a microcomputer, and includes an output section 6a for sending a control signal to the pace of the transistor Tr1 of the station line closing/opening means 2 and the hands-free circuit section 5a, and an end-of-call detection as described above. An input section 6b receives the detection signal of the means 4 and the detection signal from the light receiving section of the photocoupler 1a of the incoming call detection means 1, and receives signals from the hands-free mode setting switch 11 and the key operation section 12 such as a dial key. , arithmetic control section 6c and storage section 6d
It is composed of

The storage unit 6d includes a ROM (IJ-only memory) in which the execution program of the arithmetic control unit 6C as shown in FIG.
For example, it is comprised of a RAM (random access memory) in which the number of intermittent tones for detecting the end of a call (for example, 1 second on, 2 seconds off) and the number of intermittent tones are stored.

Next, the operation of the above embodiment, particularly the operation of the arithmetic control section 6C, will be explained with reference to FIG.

In step 14, it is determined whether the switch 11 is set to the hands-free mode, and if YES, the process proceeds to step 15.

In addition, when the switch 11 is not set to the hands-free mode, when a predetermined key on the key operation unit 12 is operated, when the handset 8 is off-hook, etc.
A call can be made via the handset 8.

In step 15, the photocoupler 1a of the incoming call detection means 1
By monitoring the signal from the light-receiving unit and, when a signal is input, comparing the frequency and cycle with the frequency and cycle of the incoming signal preset in the storage unit 6d,
Determine whether or not a call has been received.

That is, in this embodiment, since the incoming signal is detected based on its frequency and period, erroneous detection of the incoming signal can be prevented.

When an incoming call is received in step 15, the process proceeds to step 16, where the transistor Tr1 of the central line closing/opening means 2 is turned on to turn on the transistor Tr2 to close the central line, and in the subsequent step 17, the hands-free circuit section 5a
Start.

Therefore, the transistor Tr of the station line closing/opening means 2
2. A communication path is formed between the central office line, the speaker 5b, and the microphone 5C via the communication path section 3 and the hands-free circuit section 5a, and the caller can connect and disconnect the central office line as in the conventional example. A call can be made using the speaker 5b and microphone 5C without operating any buttons or holding the handset 8 in hand.

In step 18, the transistor Tr of the call end detection means 4 is
The signal from the emitter No. 3 is monitored, and when an intermittent sound is input, the number is compared with the number of intermittent sounds preset in the storage section 6d to determine whether or not the call has ended.

If it is determined in step 18 that the call has ended, step 19
Then, by turning off the transistor Tr1 of the station line closing/opening means 2, the transistor Tr2 is turned off to open the station line, and the operation of the hands-free circuit section 5a is also stopped.

Therefore, one caller can open the central office line without operating the central office line closing/opening button again as in the conventional case, and can accept the next incoming call. It is possible to realize a hands-free telephone device that is convenient for people with disabilities.

In the above embodiment, the end of a call via the local line was detected by the intermittent sound from the local line, but the end of the call may be detected by a silent state for a predetermined time or more or by continuous sound.

Further, in the above embodiment, when the end of a call is detected, the number of words on the central office line is automatically counted. In such a case, the central office line may not be opened.

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention includes a first detecting means for detecting an incoming signal from a line, and a second detecting means for detecting an end of communication between the line and a speaker and a microphone for hands-free use. The first detection means closes the line to form a communication path between the line and the speaker and microphone when the first detection means detects an incoming signal from the line, and the second detection means closes the line and forms a communication path between the line and the speaker and microphone. Since the line is opened when a call is detected, the first detection means and the second detection means can automatically close and open the line, respectively, so that the caller can press the button. Lines can be closed and opened without any operation.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram showing an embodiment of the hands-free telephone device according to the present invention, FIG. 2 is a detailed block diagram of the hands-free telephone device shown in FIG. 1, and FIG. 3 is a flowchart for explaining the operation of the hands-free telephone device of FIG. 1... Incoming call detection means, la... Photocoupler, 2.
... Central line closing/opening means, 4... Communication path section, 5...
Hand-free circuit, 5a... Hand-free circuit section, 5
b...Speaker% 5C...Microphone, 6...
・Control unit (microcomputer), 6C... Arithmetic control unit, 6d... Storage unit, Trl, Trz, Trz・
...Transistor. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
figure

Claims (6)

[Claims] (1) A speaker and a microphone for making a call without the caller having to hold the handset; a closing/opening means for closing and opening the line; and a first detection unit for detecting an incoming call signal from the line. means, second detection means for detecting the end of a call between the line and the speaker and microphone, and when the first detection means detects an incoming call signal from the line, the closing/opening means A communication path between the line and the speaker and microphone is formed by controlling the line to be closed, and when the second detection means detects the end of the call, the closing/opening means opens the line. and means for controlling the hands-free telephone device to (2) The second detection means detects the intermittent sound from the line (1
) hands-free telephone device. (3) The hands-free telephone device according to claim 1, wherein the second detecting means detects the end of a call based on a silent state of the communication path. (4) The hands-free telephone device according to claim (1), wherein the second detection means detects the end of a call based on continuous sound from the line. (5) It has a switch for setting a hands-free mode so that the caller can make a call without holding the handset in hand, and the control means controls the control means when the hands-free mode is set by the switch. and when the first detection means detects an incoming signal from the line, the closing/opening means controls to close the line, thereby forming a communication path between the line and the speaker and microphone. and when the second detection means detects the end of the story,
5. The hands-free telephone device according to claim 1, wherein the opening means controls the line to be opened. (6) A switch for prohibiting the detection of the end of the call by the second detection means, and the control means is configured such that when the switch prohibits the detection of the end of the call, the closing/opening means Claims (1)-(
5) The hands-free telephone device according to any one of 5).