JPH048982B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a radio telephone device that can output a high-quality dial confirmation sound without complicating the configuration of the radio telephone.

In recent years, various wireless telephone devices have been developed that transmit dial signals and call signals generated by a wireless telephone to a parent device via a wireless line, and then send them out from this parent device to a wired telephone line (subscription telephone line). . If the dial is not a rotary dial, that is, a touch-type (including push-type) dial, it is desirable to output a sound or the like during dial operation so that the user can confirm the dial operation so that the dial operation can be performed reliably.

Therefore, conventionally, dial operation has been confirmed in the following manner, for example. That is, a dial tone signal corresponding to the dialed number is generated by operating a dialing push switch of a wireless telephone, and a carrier wave is modulated with this dial tone signal and sent to a wireless line. On the other hand, the parent device receives the carrier wave from the wireless telephone, demodulates it, reproduces the dial tone signal, and sends this dial tone signal to the subscriber telephone line via the hybrid circuit. At the same time, the parent device attenuates the reproduced dial tone signal by, for example, 20 dB in the hybrid circuit, modulates a carrier wave with the reproduced dial tone signal, sends it out to the wireless line, and returns it to the wireless telephone. The radio telephone receives the carrier wave from the parent device, demodulates it, extracts the reproduced dial tone signal, and uses the reproduced dial tone signal to ring the handset and output the voice as a confirmation tone. In other words,
Such a dial confirmation method uses the so-called sidetone of a dial tone signal as it is as a dial confirmation tone. In addition to the transmitter and receiver of the handset, loudspeakers and sounders for amplification provided separately from the transmitter and receiver are often used as the sounding device for outputting the dial confirmation sound.

However, in such a system, when the dial tone signal travels back and forth between the radio telephone and the parent device, level fluctuations and distortions occur in the tone signal due to variations in characteristics of the radio line, transmitter/receiver, etc. Also,
The reproduced dial tone signal sent back from the parent device to the radiotelephone is subject to level fluctuations due to changes in the impedance of the subscriber telephone line. For this reason, the volume and tone of the confirmation sound fluctuate, resulting in discomfort to the user. Furthermore, when a dial tone signal is used as the confirmation sound in this way, the confirmation sound is a two-wave parallel tone signal itself, so if the volume is too loud, it may hurt the user's ears or cause discomfort to the user. Become. For this reason, the confirmation sound is usually kept below a predetermined level. Therefore, the volume of the confirmation sound may become weak due to distortion or level fluctuation of the dial tone signal, resulting in a problem that the confirmation sound cannot be heard.

On the other hand, the number corresponding to the dial number on the wireless telephone is 2.
There is a wireless telephone device that composes a binary signal and transmits this binary signal to a parent device via a wireless line, and the parent device generates a dial tone signal corresponding to the binary signal and sends it to a subscriber telephone line. . In the case of this type of device, a dial tone signal generated by the parent device is transmitted to the wireless telephone, and the dial tone signal causes the receiver to ring to generate a dial confirmation tone.

Therefore, the dial confirmation tone has less variation in volume and tone due to level fluctuations and distortions that occur during transmission of the dial tone signal from the wireless telephone to the parent device, and as a result, the sound quality of the dial confirmation tone is reduced. Slightly improved. However, in order to generate the dial confirmation sound substantially simultaneously with the dial operation, the binary signal must be transmitted at high speed. However, in order to transmit binary signals at high speed, high speed clock pulses are required, resulting in an increase in power consumption. This increase in power consumption is undesirable for wireless telephones, which are required to be smaller and lighter, because it leads to larger batteries and more complex circuit configurations. Furthermore, if a high-speed clock pulse is used, the clock frequency and harmonics may enter the radio line, causing deterioration of spurious characteristics. For this reason, the radio telephone must be strictly shielded, which also causes the radio telephone to become larger. Furthermore, the error rate of binary signals increases as the transmission speed increases, so as mentioned earlier, in order to transmit binary signals at high speeds, it is necessary to perform error correction processing, which increases the complexity of the circuit. was inviting.

The present invention has been made focusing on the above circumstances,
The purpose of this is to make it possible to generate a dial confirmation tone without using the sidetone method, thereby making it possible to generate a high-quality dial confirmation tone with no fluctuations in tone or volume and with an appropriate volume. ,
Moreover, it is an object of the present invention to provide a radio telephone device which can generate a ringing tone and a dial confirmation tone in a radio telephone only by using one oscillator, thereby making the radio telephone simple and compact.

Hereinafter, the present invention will be described with reference to an embodiment shown in the drawings. FIG. 1 is a schematic configuration diagram of a wireless telephone device to which the dial confirmation sound notification system is applied in the same embodiment. In the figure, 1 is a wireless telephone, 2 is a subscriber telephone line 3
It shows the parent device connected to.

The radio telephone 1 includes a dial switch 11 consisting of, for example, a 3×4 pushbutton switch and an encoding circuit 12. When the dial switch 11 is operated, the encoding circuit 12 generates a binary signal corresponding to the dialed number. is occurring. This binary signal is converted into an FSK signal by the signal control circuit 13, and then supplied to the transmitter 14 as a modulation input. The transmitter 14 modulates the carrier wave using the modulation input described above and transmits it to the radio line 4 via the transmitting antenna 15.

On the other hand, the parent device 2 first transmits the carrier wave from the radio telephone 1 to the receiving unit 22 via the receiving antenna 21.
The binary signal is received and further demodulated to reproduce the binary signal. Then, the signal control circuit 23 outputs a control signal corresponding to the reproduced binary signal to drive the dial signal generation circuit 24, and the dial tone signal generated by the dial signal generation circuit 24 is added via the hybrid circuit 25. It is being sent to telephone line 3. In addition, the parent device 2 guides a call signal from another station transmitted via the subscriber telephone line 3 to the transmitter 26 via the hybrid circuit 25, and also guides the call signal from the exchange to the call signal detection circuit 27. When detected, the signal control circuit 23 forms a new calling signal in a different signal format, guides it to the transmitting section 26, and sends it out from the transmitting section 26 to the radio line 4 via the transmitting antenna 27.

On the other hand, the wireless telephone 1
The receiving section 17 receives and demodulates the carrier wave from the receiver via the receiving antenna 16 to reproduce the calling signal and the call signal, and in the case of the regenerated call signal, it is directly supplied to the receiver 18, while in the case of the regenerated call signal, It is introduced into the signal control circuit 13.

Now, when this signal control circuit 13 is supplied with the reproduction calling signal or the binary signal from the encoding circuit 12, it outputs a drive signal to the ringing tone generation circuit 51 and also outputs a drive signal to the attenuation circuit 52. Outputs operation control signals. The ringing tone generating circuit 51 generates a ringing tone signal of a predetermined frequency based on the drive signal, and supplies this ringing tone signal to the transmitting section 53 via the attenuation circuit 52 to cause the ringing tone signal to ring.

Here, the attenuation circuit 52 is configured as shown in FIG. 2, for example. That is, the output (ringing tone signal) of the ringing tone generation circuit 51 is transmitted through a plurality of resistors (R1 to R1 in the figure) connected in series with each other.
R5) to the transmitter 53. Also,
Fixed contacts SW1 to SW4 of the changeover switch SW are provided at each connection point of each of the resistors R1 to R5.
A movable contact SW0 of the changeover switch SW is connected to the collector of the switching transistor T _r .
This switching transistor T _r is turned on and off by an operation control signal from the signal control circuit 13, and connects an N-type emitter to the transmitter 5.
Connected to 3.

According to such a configuration, when a call occurs from another station, that is, when a call signal is transmitted to the wireless telephone 1 via the subscriber telephone line 3 and the parent device 2, the signal control circuit 13 of the wireless telephone 1 drives the ringing tone generation circuit 51 and at the same time drives the attenuation circuit 52.
An operation control signal is supplied to turn on the switching transistor T _r . Therefore, the ringing tone signal generated by the ringing tone generating circuit 51 is supplied to the transmitter 53 via the changeover switch SW and the switching transistor _Tr . As a result, a large current is supplied to the transmitter 53 by the amount not intervening through the resistors R1 and R2 in FIG.
3 outputs a relatively loud voice, that is, a ringing tone. This is normal tone ringing operation.

On the other hand, when the dial switch 11 of the radio telephone 1 is operated and a binary signal corresponding to the dialed number is generated in the encoding circuit 12, the signal control circuit 1
3 drives the ringing tone generation circuit 51 and sets the switching transistor T _r of the attenuation circuit 52 to the OFF state. For this reason, the ringing tone generation circuit 5
The ring tone signal generated at R1
~R5 to the transmitter 53. Therefore, the magnitude of the ringing tone signal supplied to the transmitter 53 is smaller than that at the time of ringing (when the switching transistor T _r is turned on). Therefore, a sound smaller than the ringing tone is generated from the transmitter 53, and this can be used as a dial confirmation tone. At this time, the volume of this dial confirmation sound is determined by the resistance values of resistors R1 to R5 of the attenuation circuit 52.
Alternatively, by varying the number of installations, an appropriate size can be determined.

In this way, according to this embodiment, the ringing tone generation circuit 5 is controlled by the signal control circuit 13 during dial operation.
1 and attenuates the ringing tone signal from the ringing tone generation circuit 51 by the attenuation circuit 52 and supplies it to the transmitter 53.
In other words, since the sidetone is not used as the dial confirmation sound, it is possible to generate an excellent dial confirmation sound without fluctuations in sound quality and volume. Furthermore, since the dial confirmation tone is not generated by the sidetone method, there is no need to generate high-speed clock pulses to transmit dial information. Therefore, power consumption is reduced and there is no need for special shielding, so the configuration of the wireless telephone can be made simpler and more compact.

In addition, in this embodiment, the dial information is composed of binary signals instead of dial tones, so
Since it is possible to eliminate the need for a dial tone generation circuit in the radio telephone and to generate the dial confirmation tone by sharing the existing ring tone generation circuit 51, as a result, the radio telephone requires only one oscillation circuit. It can be done. Therefore, this also makes it possible to simplify and downsize the circuit configuration of the wireless telephone. This effect is extremely important for wireless telephones, where compactness and weight reduction are essential requirements.

In this embodiment, the attenuation circuit 52 is newly provided, but the attenuation circuit 52 can be configured by adding a simple switching circuit to the circuit conventionally provided for adjusting the volume of the ringer. The configuration is extremely simple and does not complicate the circuit configuration.

Note that the present invention is not limited to the above embodiments. For example, the attenuation circuit 52 may be configured as a variable resistor, that is, a general volume, so that the volume of the dial confirmation sound as well as the ringing sound can be adjusted. Furthermore, the touch dial is not limited to the dial switch 11, and may literally be a touch dial made of, for example, a piezoelectric element or the like and which does not have a stroke.

As detailed above, the present invention provides a wireless telephone with:
It includes dial information sending means, a sound source, a signal attenuation circuit, and a sound generator. When a dialing operation is performed, the dial information sending means generates a coded signal corresponding to the dialed number, modulates this coded signal, and sends it to the parent device. In addition, when incoming call information is sent from the parent device, the first
A second ringing signal is generated from the sound source in response to the dial operation of the wireless telephone. The first and second sound signals generated from the sound source are input to the signal attenuation circuit to reduce the signal level of the second sound signal to the first sound signal.
The first and second sound signals output from this signal attenuation circuit drive the sound generator, and the sound generator outputs the first and second sound signals. A ring tone and a dial confirmation tone are respectively generated in response to the ringing signal.

Therefore, according to the present invention, it is possible to generate a dial confirmation sound without using the sidetone method, thereby generating a high quality dial confirmation sound with no variation in timbre or volume and with an appropriate volume. To provide a wireless telephone device capable of generating a ringing tone and a dial confirmation tone in a wireless telephone only by using one oscillator, and thereby making the wireless telephone simple and compact.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of a radio telephone device to which an embodiment of the present invention is applied, and FIG. 2 is a diagram of a main part of the device. DESCRIPTION OF SYMBOLS 1... Radio telephone, 2... Parent device, 3... Subscriber telephone line, 4... Wireless line, 11... Dial switch, 1
2... Encoding circuit, 13, 23... Signal control circuit, 1
4, 26... Transmission unit, 15, 27... Transmission antenna,
16, 21... Reception antenna, 17, 22... Receiving unit, 18... Receiver, 24... Dial signal generation circuit, 25... Hybrid circuit, 27... Ringing signal detection circuit, 51... Ringing tone generation circuit, 52... Attenuation circuit, 53 ...Telephone.

Claims (1)

[Claims] 1. Consists of a parent device connected to a wired line and a wireless telephone connected to the parent device via a wireless line, and transmits incoming call information when a calling signal arrives via the wired line. In a wireless telephone device that transmits a ring tone from a parent device to a wireless telephone via a wireless line to generate a ring tone, the wireless telephone transmits an encoded signal corresponding to a dialed number when a dialing operation is performed. dial information sending means that generates dial information, modulates the dial information, and sends the modulated dial information to the parent device;
one sound source that generates a sound signal and generates a second sound signal in response to the dial operation, and inputs each of the first and second sound signals generated from this sound sound source. a signal attenuation circuit that sets the signal level of the second sound signal to a lower level than the signal level of the first sound signal; and the first and second sound signals output from the signal attenuation circuit. What is claimed is: 1. A wireless telephone device comprising: a sound generator driven by a sound generator, which generates a ring tone and a dial confirmation tone, respectively, in response to these signals.