JPH06164441A - Slave set for cordless telephone - Google Patents

Abstract

PURPOSE:To realize the function of a transceiver without increasing cost and size. CONSTITUTION:The signals received from an antenna 1 in each mode are selectively transmitted through a BPF 3 by the switching of a band changeover switch 4 and also transmitted in the voices of a cordless telephone or a transceiver from a telephone receiver part 13 via a changeover switch 6, a receiver part 8, and a voice signal processing part 12. Meanwhile those received signals are transmitted through the antenna 1 in a transmission state of a cordless telephone mode via a changeover switch 7, an LPF 5, and a duplexer 2 and also transmitted through the antenna 1 in a transmission state of a transceiver mode via the switches 7 and 6, the BPF 3, and the duplexer 2 respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone having a master unit and two or more slave units, and having the slave unit have a transmit / receive function.

[0002]

2. Description of the Related Art Conventionally, a cordless telephone having two or more cordless handsets having a cordless handset having a transceiver function has been proposed, for example, in Japanese Patent Laid-Open No. 4-129455. In this cordless telephone, the slave unit has a function as a transceiver receiver in addition to a function as a normal slave unit.

[0003]

However, in this slave unit, in order to realize the wireless function as the transceiver in addition to the required wireless function as the slave unit, a normal transceiver is simply added. However, there is a problem that the added transceiver increases the cost as it is, and the entire size also increases, which hinders the miniaturization.

Therefore, an object of the present invention is to provide a cordless telephone slave unit which can realize the function of a transceiver without increasing the cost and without increasing the size.

[0005]

In order to achieve such an object, in the cordless telephone cordless handset of the present invention,
Received signal switching means for selecting and switching between the received signal in the cordless telephone mode and the received signal in the transceiver mode according to each frequency band and outputting to the receiving side, and the received signal from this received signal switching means Receiving means for performing a receiving operation according to each of the modes, a transmitting means for performing a transmitting operation by switching the transmission signals of the cordless telephone mode and the transceiver mode according to the frequency band. And a transmission signal switching means for selecting and switching and outputting to the transmitting side.

[0006]

In the cordless telephone mode, the reception signal corresponding to the mode is given to the reception means by the reception signal switching means. The receiving means performs the receiving operation corresponding to the mode. On the other hand, in transceiver mode,
The reception signal corresponding to the mode is given to the reception means by the reception signal switching means, and the reception means performs the reception operation corresponding to the mode.

The transmitting means operates by switching the transmission signals of the cordless telephone mode and the transceiver mode according to the frequency band. The transmission signal switching means selects and switches the transmission signal from the transmission means according to each of the modes and outputs it to the transmission side.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

Embodiment 1 FIG. 1 is an internal circuit diagram of a cordless telephone handset according to Embodiment 1 of the present invention. This cordless handset is a low-power cordless telephone in cordless telephone mode and a specified low-power transceiver in transceiver mode. It has a transmitting and receiving frequency in accordance with the regulations of the Radio Law. In the transceiver mode, the transmission / reception frequency is assumed to operate in the 420 MHz band.

Referring to the drawings, a transmitting / receiving antenna 1 for both transmission and reception is provided. The duplexer 2 separates the transmission signal and the reception signal of the cordless telephone, and because of the separation operation, the transmission signal of the 250 MHz band is passed through the transmission path.
It operates so as to block the reception signal in the band of ˜420 MHz and allow the reception signal to pass through the reception path but block the transmission signal. The bandpass filter 3 has a pass band of the reception frequency (380 MHz) in the cordless telephone mode and a transmission / reception frequency (420 MHz) in the transceiver mode.
(MHz) pass band. The band-switching switch 4 switches the pass band of the band-pass filter 3 between the pass band of the reception frequency in the cordless telephone mode and the pass band of the transmission / reception frequency in the transceiver mode. For example, a switch such as a transistor. Is used to change the capacitance of the capacitor, or a varicap diode is used.

The low-pass filter 5 is a filter for attenuating harmonics of a 250 MHz band transmission signal in a cordless telephone mode. Transmit / receive signal selector switch 6
And the transmission signal changeover switch 7 are a high-frequency diode or the like for changing over the reception signal or the transmission signal in response to the input of the control signal from the control unit 15 by operating the mode changeover switch 16 and the press talk switch 17, respectively. It is composed of high frequency relays. The transmission / reception signal changeover switch 6 is used as a contact on the reception side in both cordless telephone mode and transceiver mode during reception.
During transmission in the transceiver mode, the transmission side contact is switched, and during transmission, the transmission signal changeover switch 7 is switched to the cordless telephone transmission side contact in the cordless telephone mode and switched to the transceiver transmission side contact in the transceiver mode.

The receiving section 8 is for demodulating the reception signal from the transmission / reception signal changeover switch 6 into an audio signal.
The reception PLL unit 9 generates a local oscillation signal for tuning the reception unit 8 to a desired reception frequency, and responds to setting data from the control unit 15 to tune to the desired frequency. The oscillation signal is switched and output according to the cordless telephone mode and the transceiver mode.

The transmission unit 10 is for amplifying the transmission signal and controlling the transmission output, and the transmission PLL unit 11 is for generating a desired transmission frequency modulated by the voice signal and is for the reception PLL unit. In the same way as in No. 9, in response to the setting data from the control unit 15, a local oscillation signal for tuning the transmission unit 10 to a desired transmission frequency is generated corresponding to the cordless telephone mode and the transceiver mode.

The voice signal processing section 12 performs processes such as amplification, band limitation and noise suppression of a voice signal transmitted / received to / from the cordless telephone base unit. The receiver 13 is a speaker and the transmitter 14 is a microphone.

The control unit 15 controls the operation of the cordless telephone handset as a whole. Mode switch 16
Is for switching the handset to a cordless telephone mode or a transceiver mode. The press talk switch 17 is for switching transmission / reception in the transceiver mode, and is normally in an OFF state, that is, a receiving state, and is manually operated in an ON state during transmission.

Next, the operation will be described.

(A) Cordless telephone mode When the mode selector switch 16 gives an operation input to the cordless telephone mode to the cordless telephone mode, the controller 15 outputs a control signal to the band selector switch 4. By changing the pass band frequency of the band pass filter 3 to the 380 MHz band side and outputting the control signal to the transmission / reception signal changeover switch 6 and the transmission signal changeover switch 7 as well, the transmission / reception signal changeover switch 6 and the transmission signal changeover switch 7 and 7 are respectively switched to the contact side, the receiving PLL unit 9 is set to the local oscillation frequency output state corresponding to the receiving unit 8 so that the receiving unit 8 can tune to the cordless telephone receiving frequency of the 380 MHz band, and the transmitting unit 10 It corresponds to the transmission PLL unit 11 so that can be tuned to the transmission frequency of 250 MHz band. Set to the local oscillation frequency output status.

In this way, in this slave unit, the received signal of the cordless telephone from the transmitting / receiving antenna 1 is band-selected by the bandpass filter 3 via the duplexer 2 and then via the contact of the transmission / reception change-over switch 6. 8 is received, converted into a voice signal by the voice signal processing unit 12, and further output as voice from the receiving unit 13, while the voice from the transmitting unit 14 is a signal corresponding to the voice in the voice signal processing unit 12. And the transmission unit 10
Is output as a signal in the frequency band corresponding to the cordless telephone mode, is given to the low-pass filter 5 via the contact of the transmission signal changeover switch 7, and the harmonics are removed there, and then the duplex antenna is transmitted via the duplexer 2. It is output from 1.

(B) Transceiver mode When an operation input for setting the slave unit to the transceiver mode is given from the mode changeover switch 16 to the control unit 15, the control unit 1
Reference numeral 5 outputs a control signal to the band change switch 4 to switch the band pass filter 3 to a frequency of the 420 MHz band as a band pass frequency, and a control signal corresponding to this operation input is transmitted / received signal changeover switch 6 and transmission signal changeover switch. 7 by switching the transmission / reception changeover switch 6 to the contact during reception and the contact side during transmission by the ON / OFF operation of the press talk switch 17 and the transmission signal changeover switch 7 to the transceiver mode transmission side contact. Switch to.

The control section 15 also sets the same setting data as described above to the reception PLL section 9 during reception in the transceiver mode, and the transmission PLL section 11 during transmission.
The setting PLL outputs the same setting data as described above to the receiving PLL unit 9 so that the receiving unit 8 can tune to the receiving frequency in the transceiver mode of the 420 MHz band. Further, the transmission PLL unit 11 is set to a local oscillation frequency output state corresponding to it so that the transmission unit 10 can tune to the transmission frequency in the 420 MHz band.

Thus, in this slave unit, the received signal in the transceiver mode from the transmitting / receiving antenna 1 is
After the band is selected by the band pass filter 3 via the duplexer 2, the press talk switch 17 is turned ON / O.
It is received by the receiving unit 8 via the contact of the transmission / reception change-over switch 6 according to the FF operation state, converted into a voice signal by the voice signal processing unit 12, and further output as voice from the receiving unit 13.

On the other hand, the voice from the transmitter 14 is converted into a signal corresponding to the voice by the voice signal processor 12, and is output as a signal in the frequency band corresponding to the transceiver mode by the transmitter 10, and the press talk is performed. Switch 17
In accordance with the ON / OFF operation state of the, the signal is given to the band pass filter 3 via the contact of the transmission signal changeover switch 7 and the contact of the transmission / reception changeover switch 6, and output from the transmission / reception antenna 1 via the duplexer 2. Operates in transceiver mode.

Second Embodiment FIG. 2 is an internal circuit diagram of a cordless telephone handset according to a second embodiment of the present invention. Parts corresponding to those in FIG. Detailed description of the parts related to the reference numerals will be omitted.

In the slave unit of the second embodiment shown in FIG. 2, in the first embodiment, the band pass filter 3 alone is used to pass the frequencies in the cordless telephone mode and the transceiver mode, that is, 380 MHz band and 420 MHz.
It has a pass band with the band, and the first band pass filter 18 is 380 when receiving in the cordless telephone mode.
Second pass band filter 1 with a pass band of MHz band
9 shows a pass band of 420 MHz band when transmitting and receiving in the transceiver mode. Then, the reception signal changeover switch 20
Is switched to the contact side when receiving the cordless telephone mode, and to the contact side when receiving the transceiver mode, and the transmission signal changeover switch 21 is set to the contact side when transmitting in the cordless telephone mode and to the contact side when transmitting in the transceiver mode. The transmission / reception signal changeover switch 22 is switched to the contact side during reception in the transceiver mode and to the contact side during transmission in the transceiver mode.

In the slave unit according to the second embodiment having the above-described structure, during transmission / reception in the cordless telephone mode, the control unit 15 responds to the operation input from the mode changeover switch 16 by connecting the changeover switches 20 and 21 to each other. To the contact side, the changeover switch 22 is switched to the contact side.
The LL unit 9 and the transmission PLL unit 11 are operated in the same manner as in the first embodiment, whereby the cordless telephone reception signal from the transmission / reception antenna 1 is passed through the duplexer 2, the bandpass filter 18, and the contact of the changeover switch 20. The voice signal processing unit 12 causes the voice signal processing unit 12 to convert the received signal into a voice signal and the voice receiving unit 13 to output voice, while the voice signal processing unit 12 processes voice from the voice transmitting unit 14. After that, the signal is transmitted from the transmission / reception antenna 1 via the transmission PLL unit 11, the transmission unit 10, the contacts of the changeover switch 21, the low-pass filter 5, and the duplexer 2.

When there is an operation input from the mode selector switch 16 indicating that the mode is the transceiver mode, the control unit 1
In response to the ON / OFF operation input from the press talk switch 17, reference numeral 5 switches the changeover switch 20 to the contact and the changeover switch 21 to the contact during reception in the transceiver mode, and controls the reception PLL unit 9 to control the reception unit. 8 to perform the operation corresponding to the transceiver mode. As a result, the reception signal from the antenna 1 in the transceiver mode passes through the duplexer 2, the bandpass filter 19, the contact of the changeover switch 22 and the contact of the changeover switch 20, and further from the receiving unit 8 through the audio signal processing unit 12. The voice is output from the receiver 13. In addition, the control unit 15 responds to an input indicating that the transceiver mode is being transmitted by the ON / OFF operation of the press talk switch 17.
Causes both the changeover switches 21 and 22 to be changed over to the contact. As a result, the voice from the transmitter 14 passes through the voice signal processing unit 12, the transmission PLL unit 11, the transmitter 10, the contact of the changeover switch 21, the contact of the changeover switch 22, the bandpass filter 19, and the duplexer 2, and the antenna 1 is transmitted. Is output from.

Third Embodiment FIG. 3 is an internal circuit diagram of a cordless telephone handset according to a third embodiment of the present invention. Parts corresponding to those in FIG. Detailed description of the parts having the same reference numerals is omitted.

In the slave unit of the third embodiment shown in FIG. 3, a receiving antenna 30, a transmitting antenna 31, and a band pass selectively having pass bands of the receiving frequency of the cordless telephone mode and the receiving frequency of the transceiver mode. The filter 32, a band change switch 33 for switching the pass band of the band pass filter 32, and attenuating the harmonics of the transmission frequency band in the cordless telephone mode and the harmonics of the transmitting frequency band in the transceiver mode selectively. The low-pass filter 34 and the band-change switch 35 for switching the attenuation band of the harmonics of the low-pass filter 34 are provided.

When the cordless telephone mode is transmitted and received by operating the mode selector switch 16, the bandpass switch 32 receives the bandpass filter 32 in the cordless telephone mode in response to the control signal from the control section 15. In the pass band of the frequency band (380 MHz band), the band pass switch 35 is used to set the low pass filter 34 to the transmission frequency band (250 MHz) in the cordless telephone mode.
Band) and the reception P in response to a control signal from the control unit 15 as well.
The LL unit 9 and the transmission PLL unit 11 are set so that the reception unit 8 and the transmission unit 10 perform operations corresponding to the respective reception and transmission. The cordless telephone reception signal received by the receiving antenna 30 is converted into a voice signal by the voice signal processing unit 12 via the band pass filter 32 and the receiving unit 8 and then output as voice from the receiving unit 13 for transmission. The voice given to the unit 14 is converted into a signal by the voice signal processing unit 12 and output from the transmission antenna 31 via the transmission PLL unit 11, the transmitter 10, and the low-pass filter 34.

When the transceiver mode is set by the operation input of the mode changeover switch 16, the control section 12 controls the band changeover switches 33 and 35 in response to the ON / OFF operation input of the press talk switch 17. The bandpass filter 32 is set to a passband mode in the frequency band (420 MHz band) corresponding to reception in the transceiver mode, and the lowpass filter 34 is set to an attenuation mode of harmonics in the frequency band (420 MHz band) corresponding to transmission in the transceiver mode. The unit 9 and the transmission PLL unit 11 are also controlled so as to perform the reception and transmission operations corresponding to the transceiver mode. As a result, the transceiver reception signal from the reception antenna 30 is converted into an audio signal by the audio signal processing unit 12 via the bandpass filter 32 and the receiving unit 8 by the ON / OFF operation of the press talk switch 17, and then the receiving unit. 13 is output as voice, and the transmitter 14
The voice input from the is converted into a signal by the voice signal processing unit 12, and is output via the transmission PLL unit 11, the transmission unit 10, the low-pass filter 34, and the transmission antenna 31. In this case, the control unit 15 operates in the transceiver mode by ON / OFF operation of the press talk switch 17,
Control reception and transmission as described above.

Fourth Embodiment FIG. 4 is an internal circuit diagram of a cordless telephone handset according to a fourth embodiment of the present invention. Parts corresponding to those in FIG. Detailed description of the parts having the same reference numerals is omitted.

In the child device of the fourth embodiment shown in FIG. 4, a reception antenna 30, a transmission antenna 31, and a reception signal which is switched to the contact side when receiving the cordless telephone mode and to the contact side when receiving the transceiver mode. A changeover switch 36 and a transmission signal changeover switch 37 that is switched to the contact side when transmitting in the cordless telephone mode and to the contact side when transmitting in the transceiver mode,
Further, a bandpass filter 38 having a pass band of the reception frequency in the cordless telephone mode, a band pass filter 39 having a pass band of the reception frequency in the transceiver mode, and the attenuation of harmonics of the transmission frequency band in the cordless telephone mode. It is characterized in that it has the low-pass filter 40 that it has and the low-pass filter 41 that attenuates the harmonics of the transmission frequency band in the transceiver mode.

In the slave having the above-mentioned configuration, when the operation input of the mode changeover switch 16 is the transmission / reception in the cordless telephone mode, the control section 15 switches the changeover switches 36 and 37 to the contact side, and the reception PLL section 9, Transmission PL
The L section 11 is also caused to operate in accordance with that mode. As a result, the received signal of the cordless telephone from the receiving antenna 30 is converted into an audio signal by the audio signal processing unit 12 via the contact of the changeover switch 36, the bandpass filter 38, and the receiving unit 8, and then the receiving unit 13 receives it. While being output as voice, the voice from the transmitting unit 14 is output by the voice signal processing unit 1.
2, the transmission PLL unit 11, the transmission unit 10,
It is output from the transmitting antenna 31 via the contact side of the low-pass filter 40 and the changeover switch 37.

On the other hand, when the operation input of the mode changeover switch 16 is transmission / reception in the transceiver mode, the control unit 15 switches each of the changeover switches 36 and 37 to the contact side so that the reception PLL unit 9 and the transmission PLL unit 11 are in the transceiver mode. The operation corresponding to the reception and transmission in is performed. As a result, when a reception signal in the transceiver mode is given from the reception antenna 30, the reception signal passes through the contact side of the changeover switch 36, the bandpass filter 39, and the reception section 8 to the audio signal processing section 12 for the audio signal. The voice from the transmitter 14 is converted into the voice signal processing unit 12 while the voice is output from the receiver 13 as voice.
Then, the signal is output from the transmitting antenna 31 via the transmitting PLL unit 11, the transmitting unit 10, the low-pass filter 40, and the contact side of the changeover switch 37. In this case, the control unit 15 controls the reception and the transmission as described above by the ON / OFF operation of the press talk switch 17 in the transceiver mode.

[0035]

As described above, according to the present invention, the reception signal in the cordless telephone mode and the reception signal in the transceiver mode are selected and switched according to their respective frequency bands and output to the reception side. A signal switching unit, a receiving unit that performs a receiving operation in accordance with a received signal from the received signal switching unit, and a transmitting unit that performs a transmitting operation by switching the transmission signals of the cordless telephone mode and the transceiver mode according to their frequency bands. And a transmission signal switching means for outputting a transmission signal from the transmission means to the transmission side according to each mode, and in the cordless telephone mode, a reception signal corresponding to the mode is given to the reception means by the reception signal switching means, In the transceiver mode, the reception signal corresponding to the mode is given to the reception means by the reception signal switching means, Since the communication means can operate by switching the transmission signals of the cordless telephone mode and the transceiver mode according to the frequency band, it is not necessary to separately install a transceiver to realize the function of the transceiver. ,as a result,
There is no increase in cost and no increase in size.

[Brief description of drawings]

FIG. 1 is an internal circuit diagram of a cordless telephone slave unit according to a first embodiment of the present invention.

FIG. 2 is an internal circuit diagram of a cordless telephone slave unit according to a second embodiment of the present invention.

FIG. 3 is an internal circuit diagram of a cordless telephone slave unit according to a third embodiment of the present invention.

FIG. 4 is an internal circuit diagram of a cordless telephone slave unit according to a fourth embodiment of the present invention.

[Explanation of symbols]

 1 antenna for both transmission and reception 2 duplexer 3 band pass filter 4 band change switch 5 low pass filter 6 transmission / reception signal changeover switch 7 transmission signal changeover switch 8 reception unit 9 reception PLL unit 10 transmission unit 11 transmission PLL unit 15 control unit

Claims (5)

[Claims] 1. A received signal in cordless telephone mode,
A reception signal switching means for selecting and switching a reception signal in the transceiver mode according to each frequency band and outputting to the reception side; and a reception means for performing a reception operation according to the reception signal from the reception signal switching means. , A transmission means for switching the transmission signals of the cordless telephone mode and the transceiver mode according to their frequency bands to perform a transmission operation, and a transmission signal from the transmission means is selected and switched according to each mode and output to the transmission side. A cordless telephone cordless handset, comprising: 2. The reception signal switching means has a filter means having a reception frequency band in the cordless telephone mode and a transmission / reception frequency band in the transceiver mode, and the reception frequency band of the filter means according to the mode. 2. The cordless telephone slave unit according to claim 1, further comprising band switching means for selectively switching. 3. The reception signal switching means includes a first filter means having a reception frequency band in a cordless telephone mode, a second filter means having a transmission and reception frequency band in a transceiver mode, and a cordless telephone mode. 2. The cordless telephone according to claim 1, further comprising mode switching means for connecting the first filter means to the cordless telephone receiving side during reception and the second filter means to the transceiver receiving side during reception in the transceiver mode. Cordless handset. 4. The reception signal switching means has a reception filter means having a reception frequency band in each of a cordless telephone mode and a transceiver mode, and a band switching for selecting and switching the reception frequency band of the reception filter means according to the mode. Transmission signal switching means, wherein the transmission signal switching means has attenuation of harmonics of the transmission frequency band in the cordless telephone mode and attenuation of harmonics of the transmission frequency band in the transceiver mode, and the transmission filter. 2. The cordless telephone slave unit according to claim 1, further comprising band switching means for selectively switching the attenuation band of the harmonic of the means according to the mode. 5. The reception signal switching means has a reception mode switching means for switching to the cordless telephone mode side when receiving the cordless telephone mode and a transceiver mode side when receiving the transceiver mode, and a reception frequency band in the cordless telephone mode. Then, a first reception filter means to which a reception signal is given through the reception mode switching means and a second reception filter having a reception frequency band in the transceiver mode and to which the reception signal is given through the reception mode switching means. A first transmission filter means having attenuation of harmonics of a transmission frequency band in a cordless telephone mode, and a first transmission filter means having attenuation of harmonics of a transmission frequency band in a transceiver mode. The second transmission filter means and the first transmission filter means when transmitting in cordless telephone mode. The Anchina side, cordless telephone handset of claim 1 is intended to include a transmission mode switching means for switching each of the second transmission filter means transmitting Anchina side than at the transceiver mode transmission.