JPS60219818A - Radio equipment - Google Patents

Abstract

PURPOSE:To attain miniaturization and low power consumption by decreasing a transmission output at talking in voice more than a transmission output at data communication. CONSTITUTION:A transmission section 2 receives a voice signal from a microphone 1 or transmission data from a logical control section 7, modulates a carrier and transmits the result from an antenna 3. Furthermore, a reception signal from the antenna 3 is received by a reception section 5, a demodulated voice signal is outputted from a speaker 6 and the demodulated reception data is inputted to a logical control section 7. The logical control section 7 has a function reducing a transmission output at the talking in voice more than the transmission output at the communication of data.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a wireless device that uses different communication forms during line setup and during a call, and is particularly directed to miniaturization and lower power consumption.

Conventional technology and problems Commercial MCA (Multi Channel Ac
cess) wireless or personal wireless is a system in which multiple channels are shared by a large number of users.When setting up a line, data communication is performed using control signals on a control channel common to all subscribers, and after setting up a line, data communication is performed using a control signal on a control channel common to all subscribers. It becomes possible to talk on the channel (communication using voice signals). The modulation method for data communication in personal wireless is FSK.
(Frequency Shift Keying), the reliability of data communication using this method is not as high as that of normal digital data communication using a higher-grade method.Therefore, it is thought that the higher the transmission power, the higher the reliability.

On the other hand, it has been confirmed that human hearing can distinguish audio signals even if the noise level is high to a certain extent in the communication channel.For example, the reception input level is +5 to +6
The limit input for data communication to occur normally is dB/μ■, and voice communication is possible even below -3dB/μ■, so the transmission output level when using the voice channel is about 10dB higher than when using the IJ channel. Even if it's low, it's good.

However, current personal radios and the like are set to always output a constant output (for example, 5 W), which consumes a large amount of power, and the transmitter's heat radiator is also large. Therefore, it is not suitable for miniaturization for portable use or for extending battery life.

OBJECTS OF THE INVENTION The present invention aims to reduce power consumption and downsize by lowering the transmission output during voice communication than during data communication, thereby making this type of wireless device advantageous for portability.

Composition of the Invention The present invention provides a wireless device that is equipped with a transmitting and receiving function and performs data communication using control signals when setting up a line, and after setting up the line, enables communication using voice signals. The transmitter is characterized in that it has a transmission output control function to lower the transmission output than the transmission output, and this will be explained in detail below with reference to the illustrated embodiment.

Embodiment of the Invention FIG. 1 is a schematic diagram showing an embodiment of the invention.
2 is a microphone that inputs the audio signal AT, and 2 is the audio signal AT.
Or a transmitting unit that modulates a carrier wave PFT in the 900 MHz band with the transmitted data DT, 3 is a transmitting/receiving antenna, 4
5 is a receiving section, 6 is a speaker that outputs the demodulated audio signal AR, and 7 is a logic control section that receives the demodulated received data DR.

The logic control unit 7 switches the antenna switch 4 in response to the Tl) breath talk signal PS, and also switches the antenna switch 4 between the transmitting unit 2 and the receiving unit 5.
(2) A function to send and receive data DT and DR necessary for line setup, (3)
) It has a function to set the control channel during data communication, and a function to set the call channel during a call, but in this example, the control channel also has the function of setting the rated output (for example, 5W).
In addition, a function is added to control the communication channel to generate a lower transmission power (for example, 0.5 W, which is 10 dB lower). CTL is a transmission output control signal for this purpose.

FIG. 2 is a detailed diagram, in which 21 is the power amplifier of the transmitter 2, 22
receives the frequency setting signal (for example, PLL division ratio) N from the logic control unit 7, and outputs the first local oscillation signal 1sLLO on the receiving side.
23 is an audio amplifier that amplifies the audio signal AT converted by the microphone 1; 24 is a low-pass filter (L P F) called a splatter filter; these are included in the transmitter 2; It will be done. 71 is M extracted from the logic control section 7
The SK modulation/demodulation section performs MSK demodulation of the received data DR and also performs transmission data Dtt-MSK modulation. MSK is Mini
Mum is an abbreviation for 5-hift keying.

The logic control unit 7 distinguishes between the transmission mode and the reception mode by turning on/off the breathtalk signal PS from the breathtalk switch 8. It also has a function of detecting the reception input level LEV and determining whether the searched call channel is free, or whether the channel in progress has ended. In addition, since it is known from the frequency setting signal N given to the synthesizer section 22 whether the channel currently in use is a control channel or a speech channel, it is set to H (high) when selecting a control channel and L (low) when selecting a speech channel. A transmission output control signal CTL can be output.

25 is a voltage control unit that receives this control signal CTL and controls the gain of the power amplifier 21; the voltage control unit 25 in this example;
is included in the transmitter 2 and generates an analog gain control voltage CTL' that makes the output RFT of the power amplifier 121 rated (for example, 5 W) when the control signal CTL is H. Moreover, when the control signal CTL is L, the output RFT of the power amplifier 21
This is a type of A/D converter that switches the gain control voltage CTL' so as to reduce the power to 0.5W, for example.

Note that it is convenient if the transmission output of the CTL-L can be varied depending on the communication distance. VR is a volume for this purpose, and by operating this volume from the outside, the gain control voltage CTL' when selecting a communication channel can be arbitrarily changed. However, CTL
- Make sure that the transmission output at H is not affected.

When the above-described configuration is applied to a personal radio, the general operation is as follows. First, when a power switch (not shown) is turned on, the device enters a reception (standby) state on a control channel.

When you turn on the breath talk switch 8 to transmit, the logic control unit 7 searches for a communication channel by changing the N value while remaining in reception mode, and searches for an empty channel with no reception input level LEV. The control channel returns to the control channel by setting the N value to the desired value again, and when it is confirmed that there is no reception level LEV on the control channel, the transmitting mode is set and the calling data signal DT is transmitted. At this time, the control signal CTL becomes H for the first time, and the transmission output RF↑ becomes the rated power.

In this way, the control channel receives the predetermined data signal DT.
After transmitting, change the N value and move to the captured free call channel. Since the control signal CTL becomes L at the same time as this switching of the N value, the subsequent transmission output RFT is switched to low power. Eventually, when the call ends and a reset button (not shown) is pressed or a timer automatically returns to the control channel, the transmission output control signal CTL becomes H.

Effects of the Invention As described above, according to the present invention, only the short period (about 200ms) during which the line is set up for data communication is at the rated output, and the transmitting output is lower than that during most of the remaining call period. Average power consumption is significantly reduced, and battery life can be extended accordingly. Furthermore, since the average transmission output is smaller, the heat sink can be made smaller, and the lighter weight and smaller size make it suitable for portability.

[Brief explanation of drawings]

1 and 28 are a schematic block diagram and a detailed block diagram showing one embodiment of the present invention. In the figure, 1 is a microphone, 2 is a transmitting section, 3 is an antenna, 5 is a receiving section, 6 is a speaker, 7 is a logic control section, 8 is a breathtalk switch, 22 is a power amplifier, and 25 is a voltage control section. Applicant: Minoru Aoyagi, Patent Attorney, Fujitsu Ten Limited

Claims (1)

[Claims] Transmission that lowers the transmission output during voice calls compared to the transmission output during data communications in wireless equipment that is equipped with a transmitting and receiving function and performs data communication using control signals when setting up a line, and enables calls using voice signals after setting up the line. A wireless device characterized by being equipped with an output control function.