JPH03229552A - cordless phone - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (1) Technical Field of the Invention The present invention relates to a cordless telephone main body that forms a wireless line with a wireless device connected to a telephone line, and a secondary telephone built in the cordless telephone main body. The present invention relates to a cordless telephone equipped with a charger for charging a battery.

(2) Prior art and its problems Over the past years, the field of telephones has become considerably more sophisticated. Among these, the first step was to incorporate a speaker into the phone itself. This is because the contents of the incoming call can be transmitted by voice from the speaker in a hands-free manner without having to pick up the handset when receiving a call. This function is extremely useful when transferring incoming calls from outside lines or when making simultaneous calls, and is indispensable for modern telephones.

On the other hand, cordless telephones that can expand the range of movement of the caller during a call have recently become popular. However, one inconvenience remained in handling cordless telephones like regular telephones. This is because the functionality associated with the speaker is extremely poor.

In other words, the cordless telephone is equipped with a transmitter for sending and receiving calls, a receiver 9, and a call buzzer, etc., or it is possible that a speaker is built into the cordless telephone body instead of the call buzzer. As a result, there is a need for a lighter, thinner, and smaller size, so there is no room for a built-in speaker due to the volume of the cordless phone itself, and the power consumption of the speaker amplifier is not small, which affects battery consumption. It has not been put into practical use yet.

(3) Purpose of the Invention In order to eliminate the drawbacks of the prior art, the present invention provides a cordless telephone that can prevent secondary battery consumption and amplify audio signals from a wireless line. It is something to do.

(4) Structure of the Invention In order to achieve this object, the cordless telephone of the present invention includes a cordless telephone main body that forms a wireless line with a wireless device connected to a telephone line, and a cordless telephone built into the cordless telephone main body. A cordless telephone equipped with a charger for charging a secondary battery, the cordless telephone main body comprising a transmission means for transmitting an audio frequency signal transmitted via the wireless line to the charger, The charger includes a receiving means for receiving the audio frequency signal transmitted by the transmission means, and the audio frequency signal received by the receiving means is operated by the DC power output of the charger to amplify and amplify the audio frequency signal. It has a configuration equipped with amplification means.

That is, the present invention attempts to solve the problems of the prior art as follows.

■ A cordless telephone system is a cordless telephone consisting of a wireless device on the fixed device side that connects the telephone line, a cordless telephone body on the mobile side, and a charger for charging the secondary battery built into the cordless telephone body. It consists of

■ Looking at how cordless telephones are currently used, in most cases the cordless telephone itself is placed on a charger for charging when it is on standby and not making a call. Therefore, even if the speaker is built into the charger rather than the main body of the cordless telephone, its function can be fully utilized.The present invention focuses on this point and realizes the speaker function.

(Example) Examples of the present invention will be described below.

FIG. 1(a) is a block diagram showing an example of the configuration when the present invention is used alone by being connected to a telephone line, and FIG. 1(b) is the main configuration of a cordless button telephone system to which the present invention is applied. Give an example. 1 is a telephone line (external line), 2 is a button telephone main device, 3 is a button telephone, 4 is a wireless device (hereinafter referred to as a cordless base unit), 5 is a cordless telephone main unit (hereinafter referred to as a cordless handset), 6 is a cordless handset 7 is a commercial power supply input terminal.

FIG. 2 shows an example of a specific configuration of the present invention.

This will be explained below.

In FIG. 2 (al) showing the handset side, 10 is a cordless handset, which includes a reception system antenna II, a radio reception section I2, an audio demodulation section 13, a control data reception section 14, and an audio receiver 15.
, audio amplifier 16, audio transformer 17, power supply unit 18, secondary battery 18A, capacitor 18B, charging terminal 19A.

It consists of 19B. Note that the transmission system, control system, operation section, etc. are not shown.

Next, in FIG. 2(b) showing the charger side, 20 is a charger for a cordless handset, and a charging terminal 2OA.

20B, an audio transformer 21, an audio amplifier 22, a speaker (amplification means) 23, a power supply unit 24, a capacitor 24A, a diode 24B, a main power input terminal 25 connected to a commercial power supply, etc., a timer screen unit 26, and a switch 27. are doing.

Therefore, when the cordless handset 5 is placed on the charger 6 and is in a charging state, the charging terminals 19A and 2OA are connected together, and the charging terminals 19B and 20B are connected together.

The operation of this embodiment is as follows. The wireless receiver 12 receives radio waves from the cordless base unit 4 that the cordless handset 10 captures with the antenna 11, and the audio demodulator 13 detects the waves and demodulates the audio signal. The demodulated audio signal is amplified (impedance converted) by an audio amplifier 16, and the audio signal current is sent to a transformer 17. In the charging state, the current consumed by the cordless handset 10 and the charging current for charging the secondary battery 18A (both collectively referred to as charging current) are already flowing through the secondary side of the transformer 17. The frequency component of this charging current consists of direct current and low frequency. Capacitor 18B suppresses high frequency components entering the charging current. On the other hand, the frequency band of the audio signal current is determined by the audio amplifier 16.
The frequency is 500 to 3000Hz. Therefore, even if the charging current and the audio signal current are superimposed in the transformer 17, the two do not affect each other. In this way, the charging current and the audio signal current from the cordless base unit 4 are frequency-separated, and are then connected to the negative set of charging terminals 19A, 19B, and 2OA.

Flows through 20B. That is, each charging terminal is used to transmit audio signals (call output) from the cordless handset 10 to the charger 20.
sending it to the side. In addition to voice signals, it also sends out communication signals including audio frequency signals similar to voice, such as a medium tone signal that notifies an incoming call.

This operation is controlled by a creation unit (not shown) of the cordless handset IO, independently of the operating state of the cordless handset IO (during a call, on standby, etc.).

Even when charging current is not flowing (for example, when the cordless handset 10 is not placed on the charger 2), a call signal can be sent to the outside by the power output of the secondary battery 18A.

On the other hand, the charger 20 has a structure that serves as a stand for the cordless handset 10, and as described above, the charging terminals 2OA and 20B of the charger 20, which are in contact with the charging terminals 19A and 19B of the cordless handset 10, allow the cordless handset 10 to be placed. A charging current is supplied to the handset 10. Charging terminal 20A.

A speech signal from 20B is detected by an audio transformer 21, amplified by a band-limited audio amplifier 22, and a speaker 23 is sounded. In this way, the call signal from the cordless base unit 4 is sent out from the speaker 23 of the charger 20.

In addition, the presence or absence of a call signal is detected by the timer control unit 26,
Only when a call signal is present, a switch 27 is turned on by the output of the timer control unit 26 to operate the audio amplifier 22, and if there is no call signal for a certain period of time or more, the switch 27 is turned off to stop its operation. . This makes it possible to stop the operation of the audio amplifier 22 during standby, etc., and prevent unnecessary noise from being transmitted from the speaker 23.

FIG. 3 shows another embodiment. In (a) showing the handset side, 30 is a cordless handset, 31 is a carrier wave generator, 32
3 is a modulator, 33 is a high frequency transformer, and the same numbers as in FIG. 2 indicate the same items. In (b) showing the charger side, 40 is a charger, 41 is a high frequency transformer, 42 is a tuning detector, 43 is an amplifier, and 44 is a carrier wave detector.

In this embodiment, a high frequency wave is used as a carrier wave to transmit an audio frequency signal such as a call signal from the handset 30 to the charger 40. A carrier wave generator 31 generates a high frequency of 220 kHz, a modulator 32 modulates the amplitude with a speech signal, and a high frequency transformer 33 sends out the signal. That is, the call signal is sent out from the charging terminals 19A and 19B on a carrier wave. In the charger 40, the high frequency transformer 41 detects the signal through the charging terminals 2OA and 20B, the tuned detector 42 tuned to the frequency of the transmitting side converts it back to the call signal, and the carrier wave detector 44 detects the carrier wave, so the switch is activated. 27 is amplified by the amplifier 43 which is in an operating state with the signal on, and the speaker 23 is amplified.
It is sent from.

Furthermore, when the carrier wave detector 44 cannot detect a carrier wave, the charger 40 assumes that there is no call signal from the cordless handset 30, and turns off the switch 27 to stop the amplifier 43.

In this embodiment, since the frequency bands of the charging current and the communication signal current are considerably different from each other, the influence of the charging current mixed in as noise can be further eliminated.

FIG. 4 shows yet another embodiment. 50 is a cordless handset, 51 is a transformer for magnetic leakage, 6° is a charger, and 61 is a magnetic detection transformer. The same numbers as in FIG. 2 indicate the same things.

In this embodiment, the demodulated audio signal is amplified by an audio amplifier 16, and the audio signal current is sent to a transformer 51 having magnetic leakage. The transformer 51 has an open magnetic path, and sends an audio frequency signal, that is, a call signal, to the outside (to the charger 60 side) as magnetic flux. In the charger 60, a magnetic detection transformer 6I
1 is placed in a position opposite to transformer 5■. The magnetic flux of the call signal is detected by the magnetic detection transformer 61, and is amplified by the audio amplifier 22 under the control of the timer design block 26.
Speaker 23 is sounding.

In this embodiment, the call signal can be sent completely independently of the charging current. Alternatively, instead of using magnetic flux, the same effect can be achieved by using a light emitting diode 71 and a phototransistor 72 facing each other, as shown in FIG.

Also, as a matter of course, as shown in Fig. 6, contact terminals 81 and 82 exclusively used for call signals have a structure similar to that of the charging terminal.
2, the call signal is transferred from the audio amplifier 16° of the cordless handset to the audio amplifier 2 of the charger.
It can also be sent to 2'.

In each of the embodiments shown in FIGS. 2, 3, and 4, an example is shown in which the audio amplifier 22 or the amplifier 43 is controlled using the timer control section 26 or the carrier wave detector 44. The present invention is not limited to this, and the direct current power supply Vcc may be directly supplied to the audio amplifier 22 or the amplifier 43 without using them, so that the audio amplifier 22 or the amplifier 43 is kept in a constantly operating state.

Next, to explain the specific usage with reference to Fig. 1 (a!, (bl), the cordless main unit 4 automatically answers when the incoming telephone signal is lost and connects the telephone line l to DC. The cordless base unit 4 calls the cordless handset 5 to form a call path, carries the call signal from the telephone line l onto radio waves, sends it to the cordless handset 5, and sends it from the speaker of the charger 6. Here, even if the called party does not pick up the phone, the caller's voice is transmitted from the speaker.Also, in the cordless button telephone system shown in Figure 1 (bl), when an incoming call is received from telephone line l, When a signal is received by the button telephone 3 and transferred to the cordless slave unit 5, the line is temporarily put on hold by the button telephone 3, and the cordless base unit 4 is selected and activated using the extension line. If you call the outside line number 3 or the user of cordless handset 5, Mr. r○○, the outside line is from △△.If you call j, the voice will be emitted from the speaker, so ○
Mr. ○ can answer the outside line directly. In this case, when the cordless handset 5 responds, the line is put on hold or released, and the call status is established. In addition, it is also possible for the caller of the button telephone 3 to broadcast the message ``Everyone please gather together. In addition, the melody sounds sent from the cordless base unit 4 can be output from the speaker.Furthermore, even if these sounds and signals are generated on the cordless slave unit 5 side, it is possible to easily amplify them from the speaker. can.

(5) Effects of the Invention As explained in detail above, according to the present invention, since the call signal etc. sent from the cordless base unit is sent out from the speaker of the charger, the two It has the advantage of being able to amplify the audio signals from the wireless line without draining the battery, and it also makes the cordless handset closer to an ordinary wired telephone, making it possible to make hands-free responses, making it more convenient. It has the advantage that it can be easily converted into a telephone.

[Brief explanation of drawings]

FIG. 1(a) is a block diagram showing an example of the configuration when the present invention is used alone by being connected to a telephone line, and FIG. 1(b) is the main configuration of a cordless button telephone system to which the present invention is applied. Block diagrams showing examples, Figures 2, 3 and 4
Figure 5 is a block diagram including a circuit showing an embodiment of the present invention.
FIG. 6 is a schematic diagram showing a modification of the present invention. DESCRIPTION OF SYMBOLS 1... Telephone line (external line), 2... Button telephone main device, 3... Button telephone, 4... Cordless base unit, 5.10, 30.50... Cordless slave unit, 6. 20.40.60...Charger, 7...
Commercial power input terminal, 11...reception system antenna, 1
2... Wireless receiving section, 13... Audio demodulating section, I4
...control data receiving section, 15...voice receiver,
16.16', 22.22'...Audio amplifier, 1
7.21...Audio transformer, 18, 24...Power supply unit, 18A...-Secondary battery, 18B...Capacitor, 19A, 19B, 20A, 20B...Charging terminal, 23...Speaker , 25... Main power input terminal, 26... Timer control unit, 27... Switch, 31... Carrier wave generator, 32... Modulator,
33.41... High frequency transformer, 42... Tuning detector, 43... Amplifier, 44... Carrier wave detector, 51... Transformer, 61... Magnetic detection transformer, 71... Light emission Diode, 72... Phototransistor, 81.82... Contact terminal.

Claims (1)

[Claims] (1) In a cordless telephone comprising a cordless telephone main body that forms a wireless line with a wireless device connected to a telephone line, and a charger for charging a secondary battery built into the cordless telephone main body. , the cordless telephone main body includes a transmission means for transmitting the audio frequency signal transmitted via the wireless line to the charger, and the charger receives the audio frequency signal transmitted by the transmission means. 1. A cordless telephone set, comprising: receiving means for receiving signals; and loudspeaker means for amplifying and amplifying the audio frequency signal received by the receiving means by being activated by the DC power output of the charger.