JPH04336735A - Wireless handset - Google Patents

Abstract

PURPOSE:To employ wireless configuration between a handset and a telephone set main body. CONSTITUTION:A transmission voice is inputted from a transmitter 1 and amplified to a required signal level by an amplifier circuit 2 to amplitude-modulate a carrier signal from a local oscillation circuit 3 at a mixer circuit 4. The modulated signal is amplified at a required signal level by an amplifier circuit 5 and sent toward the telephone set main body in an infrared ray via a light emitting section 6 or 7. A reception signal in an infrared ray subjected to amplitude modulation from the telephone set main body is made incident in a light receiving section 11, in which the light is converted into a high frequency signal. Then the amplifier circuit 12 amplifies the signal into a required signal level, the frequency component of the high frequency signal is extracted by a BPF 13 and inputted to a detection circuit 14, in which the signal is demodulated into a voice signal through detection and amplified to a proper signal level at an amplifier circuit 15 and outputted in voice from the receiver 16.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone set, and more particularly to a telephone set that provides wireless communication between the main body of the telephone set and a handset.

0002

2. Description of the Related Art A cord is connected to a telephone handset and a telephone main body for transmitting and receiving call signals and the like. Therefore, the range in which the handset can be moved is limited by the length of this connection cord. However, while a long connection cord is convenient when you need to look for something while talking on the phone, on the other hand, a long connection cord becomes a nuisance when the handset is on-hook.

0003

[Problems to be Solved by the Invention] The present invention has been made in view of the above points, and it transmits and receives communication signals between the telephone body and the handset using infrared rays, thereby wirelessly transmitting and receiving signals between the telephone body and the handset. The present invention provides a handset and receiver that is

0004

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides, in a telephone set, a modulation section that performs amplitude modulation of a required carrier signal using an audio signal from a transmitter, and a signal output from the modulation section. A handset is constructed of a transmitting means consisting of a light emitting section that transmits a voice signal using infrared rays, a receiving means consisting of a light receiving section that receives an infrared reception signal, and a demodulating section that demodulates the signal via the light receiving section into an audio signal. The present invention provides a wireless handset which transmits and receives data to and from a telephone main body via the transmitting means and the receiving means.

[0005]

[Operation] As configured as above, in the wireless handset according to the present invention, the carrier signal from the local oscillation circuit is amplitude-modulated by the audio signal from the handset, and the infrared signal is sent to the main body of the phone via the light emitting part. Send to. On the other hand, an infrared reception signal from the telephone body is input to the light receiving section, converted to a high frequency signal, demodulated to an audio signal by detection, and audio is output from the receiver.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a wireless handset according to the present invention will be described in detail with reference to the drawings. FIG. 1 is a block diagram of essential parts of an embodiment of a wireless handset according to the present invention. In the figure, A is a transmitter and B is a receiver. First, 1 of the transmitter A is a transmitter, and inputs a voice for transmitting a call. Reference numeral 2 denotes an amplifier circuit that amplifies the audio signal transmitted through the transmitter 1 to a required signal level. 3 is a local oscillation circuit that oscillates a required high frequency signal. 4 is a mixing circuit which amplitude-modulates the high frequency signal from the local oscillation circuit 3 using the audio signal from the amplifier circuit 2; 5 is an amplifier circuit which amplifies the high frequency signal from the mixing circuit 4 to a required signal level. Numerals 6 and 7 are light emitting sections, which transmit the high frequency signal from the amplifying section 5 to the telephone main body using infrared rays.

Reference numeral 11 in the receiving section B is a light receiving section, which inputs an infrared reception signal from the telephone body that is amplitude-modulated with an audio signal and outputs it as a high frequency signal. 12 is an amplifier circuit, and the light receiving section 1
A high frequency signal higher than 1 is amplified to a required signal level. 1
3 is a BPF (band pass filter) which allows only the carrier frequency of the received signal to pass through from the signal via the amplifier circuit 12. 14 is a detection circuit that detects the high frequency signal passed through the BPF 13 and demodulates it into an audio signal. 15 is an amplifier circuit which amplifies the audio signal from the detection circuit 14 to an appropriate signal level. Reference numeral 16 denotes a receiver, which outputs the audio signal from the amplifier circuit 15 as sound.

FIG. 2 is a perspective view of a main part of an embodiment of a wireless handset according to the present invention, and FIG. 3 is a cutaway sectional view of a main part of a light receiving and emitting part of the wireless handset. In FIG. 2, 21 is a handset, 22 is a transmitter, and 23 is a receiver. Reference numeral 24 designates light-receiving and emitting sections, which are provided at two locations on both sides of the back of the transmitting section 22. Reference numeral 25 denotes a power supply connection terminal, which is used to charge a built-in battery as a power source for operating the handset 21.

In FIG. 3, reference numeral 31 denotes a light emitting section, which corresponds to the light emitting section 6 or 7. 32 is a light receiving section, which corresponds to the light receiving section 11 described above. Reference numeral 33 denotes a filter that also serves as a cover for the light receiving and emitting parts, which cuts visible light and allows infrared rays to pass through. 3
Reference numeral 4 denotes a mirror that reflects an infrared reception signal that enters through the filter 33 and makes the signal enter the light receiving section 32 .

FIG. 4 is a block diagram of main parts of another embodiment of the wireless handset according to the present invention. In the figure, 41
and 42, a call detection circuit, which detects a call based on the level of the audio signal from the amplifier circuit 2 or 15; Reference numeral 43 denotes a determination unit that determines whether or not the call has been interrupted based on signals from the call detection circuits 41 and 42. A timer 44 starts counting time when the call is interrupted via the determining unit 43, and outputs a signal when the required time has elapsed. 45 is an alarm unit that outputs an alarm sound based on a signal from the timer 44.

Next, the operation of the wireless handset according to the present invention will be explained. The voice signal from the transmitter 1 is amplified to a required signal level by an amplifier 2, and is inputted to a mixing circuit 4 as a signal in a frequency range necessary for a telephone call via, for example, a BPF. The local oscillation circuit 3 oscillates a high frequency signal, for example, a 30 kilohertz signal, for carrying an audio signal, and inputs the signal to the mixing circuit 4 . The mixing circuit 4 performs amplitude modulation on the high frequency signal from the local oscillation circuit 3 with the audio signal from the amplifier circuit 2. The modulated high frequency signal is input to the amplifier circuit 5, amplified to a required signal level, and transmitted as an infrared signal to the telephone main body via the light emitting section 6 or 7. These light emitting parts are provided at two light transmitting and receiving parts 24 on both sides of the back surface of the transmitter 22. Then, for example, it determines which one is closer to the telephone body than the strength of the receiving signal from the telephone body by each of the light receiving sections 11 provided in the two light receiving and emitting sections 24, and switches the light receiving section to transmit the call from the light emitting section of the corresponding light receiving and emitting section. , reducing battery consumption due to infrared signal transmission.

[0012] The receiving signal from the telephone main body is, for example, 5
A carrier wave signal of 0 kilohertz is amplitude-modulated with an audio signal from a telephone line, etc., and is transmitted using infrared rays. This infrared reception signal enters the filter 33 provided in the light receiving/emitting section 24 of the handset 21, is reflected by the mirror 34, and enters the light receiving section 31. It is then converted into an electrical signal. Note that the light receiving section 11 is provided in each of the two light receiving and emitting sections 24, so that both of them perform light receiving operations at the same time. The high frequency signal from the light receiving section 11 is amplified to a required signal level by the amplifier circuit 12 and input to the BPF 13 . The BPF 13 has a frequency characteristic that allows only the carrier wave signal of the received voice, that is, the 50 kHz signal, to pass through from the signal via the light receiving section 11. The high frequency signal that has passed through the BPF 13 is input to the detection circuit 14, where detection is performed and a demodulated audio signal is output. This audio signal is amplified to an appropriate signal level by the amplifier circuit 15 and output as audio via the receiver 16.

[0013] The handset 21 operates using a built-in battery as a power source, and this battery is charged by power supplied from the telephone body through a connection terminal 25 provided on the arm, for example. That is, the two hook pieces on the phone main body are made of conductive material, and are pressed down when the handset is turned on, for example, and this action connects the phone to a charging power source via a switch. The power supply of the telephone main body and the built-in battery of the handset are connected through this hook piece and the connecting terminal 25. Note that a diode bridge circuit or the like is provided between the connection terminal 25 and the battery,
To apply power matching the polarity of the battery to the battery regardless of the polarity of the power applied from a connection terminal. This allows normal charging to occur no matter which way the handset is placed on the phone body.

If the handset 21 is left on the hook for a long period of time, for example, the handset becomes busy, making it impossible to make calls from outside, and the built-in battery is also exhausted. For this reason, it is determined whether or not the call is continuing based on the signal level of the transmitted voice or the received voice, and an alarm is issued if the call is not continued for the required time. That is, the voice signal of the outgoing voice through the amplifier circuit 2 is input to the call detection circuit 41, and the signal of the voice of the received voice through the amplifier circuit 15 is input to the call detection circuit 42. And the call detection circuit 4
1 or 42, for example, an input audio signal is applied to a required charge/discharge time constant circuit via a diode or the like. For example, the charging voltage of this circuit increases to approximately the peak value of the voice signal of the conversation when a normal phone call is made, and gradually decreases when the voice signal is interrupted. Therefore, this charging/discharging time constant is set appropriately, and the determination unit 43 determines that the call has been interrupted when the charging voltage becomes equal to or less than a predetermined value. Then, in response to the interruption of the call, the timer 44 starts counting time. The timer 44 stops counting time and is reset when the call is resumed and the charging voltage becomes equal to or higher than the predetermined value. Then, when the time counting continues for a required time, for example, 3 minutes, a signal is output. This signal is input to the alarm section 45, and a buzzer sound, for example, is output from the receiver 15 via the alarm section 45. This prevents the handset 21 from being left on the hook. Note that this alarm sound such as a buzzer can be stopped by a required operation.

[0015]

[Effects of the Invention] As explained above, in the wireless handset according to the present invention, the transmission and reception of signals between the handset and the main body of the telephone is carried out wirelessly by infrared rays. It is highly convenient as it allows you to make phone calls without any restrictions. In addition, the battery built into the handset is connected to the charging power source of the telephone body when the handset is on-hook, and is automatically charged, so there is no need to take the trouble to perform charging operations. If the handset is not on-hook while the call is interrupted, an alarm is output from the handset, so even if the handset is left unattended and hidden behind something, it can be easily found.

[Brief explanation of drawings]

FIG. 1 is a block diagram of essential parts of an embodiment of a wireless handset according to the present invention.

FIG. 2 is a perspective view of one embodiment of a wireless handset according to the present invention.

FIG. 3 is a cutaway sectional view of essential parts of the light receiving and emitting part of the wireless handset according to the present invention.

FIG. 4 is a block diagram of main parts of another embodiment of the wireless handset according to the present invention.

[Explanation of symbols]

1. Transmitter 3 Local oscillation circuit 4 Mixed circuit 6 Light emitting part 11 Light receiving section 14 Detection circuit 16　Telephone receiver 24 Receiving and emitting section 25 Connection terminal 41 Call detection circuit 44 Timer 45 Alarm section

Claims (3)

[Claims] Claim 1: A telephone set, comprising: a modulation section that performs amplitude modulation of a required carrier signal using an audio signal from a transmitter; a light emitting section that transmits a signal from the modulation section using infrared rays; A handset is constituted by a receiving means consisting of a light receiving section that receives a reception signal from the receiver, and a demodulating section that demodulates the signal received through the light receiving section into an audio signal, and the handset is connected to the telephone main body through the transmitting means and the receiving means. A wireless handset characterized by being capable of transmitting and receiving. 2. Two connection terminals are provided on the arms of the handset so as to contact the two conductive hook pieces of the telephone main body, respectively, and when the handset is on-hook, the hook pieces are connected to the power supply of the telephone main body. 2. The wireless handset according to claim 1, wherein the wireless handset is configured to supply power for charging to a battery built in the handset through the connection terminal. [Claim 3] A call detecting unit that detects a call based on a transmitting voice signal or a receiving voice signal, and a call detecting unit that starts counting time when the signal from the call detecting unit is interrupted and outputs a signal when the required time elapses. 2. The wireless handset according to claim 1, further comprising: a timer that issues a warning based on a signal from the timer.