JP2956346B2 - Telephone equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone device connected to a public telephone line, a wireless line or the like for making a telephone call.

[0002]

2. Description of the Related Art Conventionally, this type of telephone device has a handset for making a call. That is, as shown in FIG. 3, the telephone device main body 1 connected to the public telephone line 11 has the handset 2. The handset 2 has a speaker 3 and a microphone 4. The speaker 3 is connected to the hybrid circuit 5 via the receiving amplifier 6, and the microphone 4 is connected to the hybrid circuit 5 via the transmitting amplifier 7. Hybrid circuit 5 is connected to public telephone line 11. In addition to the public telephone line 11, a dial sending means 13 operated by a dial button 12 and a speaker 15
Is connected.

[0003]

However, in the above-mentioned conventional telephone apparatus, since the functions of the microphone 4 as the transmitter and the speaker 3 as the receiver in the transmitter / receiver 2 are fixed, the transmitter / receiver in a dark place. There was a problem that if the user held the phone upside down, they could not talk. Especially for cordless phones and wireless phones, there are no wires coming out of the handset, so which one should be held up?
That is, the positional relationship between the transmitter and the receiver is not known, and such an error is likely to occur.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide an excellent telephone device capable of making a telephone call regardless of which handset is set up.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention has two speakers functioning as a transmitter or a receiver, and functioning as a transmitter during a short period of time after the start of a call. Speech detection means for comparing and judging output signals from two speakers, and a changeover switch for switching a speech circuit so that a speaker with a larger output signal functions as a transmitter and the other speaker functions as a receiver. Things.

[0006]

Therefore, according to the present invention, the two loudspeakers function as a talker for a short period of time after the start of the call, and the transmission detection means compares which loudspeaker output signal is larger, and The changeover switch is switched so that the speaker functions as a transmitter and the other speaker with a smaller output functions as a receiver.

[0007]

FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a telephone device main body, which is connected to a public telephone line 11 and a handset 2. Reference numerals 3 and 4 denote speakers which can be used for both transmission and reception, and are incorporated in the handset 2. These speakers 3,
4 is connected to the transmission detecting means 10 together with the switches 8 and 9. Switches 8 and 9 are receiving amplifier 6 or transmitting amplifier 7
It is connected to the. The receiving amplifier 6 and the transmitting amplifier 7 are connected to a hybrid circuit 5 for separating transmitting and receiving. The hybrid circuit 5 is connected to the public telephone line 11 together with the dial sending means 13 and the incoming call detecting means 14. The dial sending means 13 is operated by the dial button 12. Further, the incoming call detecting means 14 has a speaker 15 and, when there is an incoming call, notifies the surroundings by an audible signal.

In general, a speaker and a microphone have very similar structures. If a speaker actively transmits an electric signal, it becomes a speaker, and if it receives vibration as an electric signal, it becomes a microphone.

FIG. 2 shows an internal circuit of the transmission detecting means. One speaker 3 is connected to one operational amplifier 21, and the other speaker 4 is connected to the other operational amplifier 22. The magnitude of the signal, that is, the volume of the signal is compared by a comparator 23. 9 is switched to a or b. Also timer 2
Reference numeral 4 indicates that the comparison by the comparator 23 can be performed only for a certain period of time from the start of the call using the speakers 3 and 4. Thereby, for example, it is possible to prevent the switches 8 and 9 from being accidentally switched during a call.

Next, the operation of the above embodiment will be described.
In the above embodiment, when one speaker 4 is brought near the mouth to input a sound, the output signal of the speaker 4 becomes larger than the output signal of the speaker 3. The transmission detecting means 10 compares these two inputs and switches the switches 8 and 9 to the a side so that the larger one is on the transmitter side. As a result, the speaker 4 is used as a transmitter,
Operates as a receiver, so that a call can be made. Conversely, when the other speaker 3 is near the mouth, the output signal of the speaker 3 is now larger than the speaker 4.
The transmission detecting means 10 compares these two inputs and switches the switches 8 and 9 to the b side so that 3 is on the transmitting side. As a result, the speaker 3 functions as a transmitter and the speaker 4 functions as a receiver, enabling a call.

As described above, according to the above embodiment, of the speakers 3 and 4 in the handset 2, the one closer to the user's mouth operates as the transmitter and the other operates as the receiver. Has the advantage of operating correctly.

[0012]

According to the present invention, as is apparent from the above embodiment, the upper speaker functions as the handset and the lower speaker functions as the handset regardless of which end of the handset is up. It is convenient because it functions as a transmitter. In particular, for example, when a handset used for a cordless telephone or the like is picked up in a dark place, it is possible to make a call without worrying about which side is up.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram of a telephone device according to an embodiment of the present invention.

FIG. 2 shows an embodiment of a transmission detecting means of the apparatus.

FIG. 3 is a schematic block diagram of a conventional telephone device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Telephone apparatus main body 2 Transmitter / receiver 3, 4 Speaker 5 Hybrid circuit 6 Receiver amplifier 7 Transmitter amplifier 8, 9 Switch 10 Transmission detection means 11 Public telephone line 12 Dial button 13 Dial transmission means 14 Incoming detection means 15 Speaker 21, 22 Operational amplifier 23 Comparator 24 Timer

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H04M 1/00

Claims (1)

(57) [Claims] 1. functioning as a transmitter or receiver
Two loudspeakers, transmission detection means for comparing and comparing output signals from two loudspeakers functioning as transmitters for a short period of time after the start of a call, and a loudspeaker for determining a speaker having a larger output signal. And a changeover switch for changing over a communication circuit so that the other speaker functions as a receiver.