JPH022332B2 - - 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 in which communication forms differ between line setup and call, and is particularly directed to miniaturization and low power consumption.

Conventional technology and problems MCA (Multi Channel Access) wireless for business use and personal wireless for personal use are systems in which multiple channels are shared by many users, and when setting up a line, data is transmitted using control signals on a control channel common to all subscribers. After communicating and setting up the line, call on the selected call channel (communication using voice signals)
becomes possible. The modulation method for data communication in personal wireless is FSK (Frequency Shift Keying), and the reliability of data communication using this is not as high as that of normal digital data communication using a more advanced method. Therefore, it is considered that the higher the transmission power, the higher the reliability.

On the other hand, it has been confirmed that in a communication channel, the human sense of hearing can distinguish audio signals even if the noise level is high to some extent. For example, when the receiving input level is +5 to +6 dB/μV, this is the limit input for data communication to occur normally, and voice communication is -
Since it is possible to achieve a transmission output level of 3 dB/μV or less, the transmission output level when using the audio channel may be about 10 dB lower than when using the control channel. However, current personal radios and the like are set to always output a constant output (for example, 5W), which consumes a large amount of power, and the transmitter's heat sink 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 compared to data communication, thereby making this type of wireless device advantageous for portability.

Structure of the Invention The present invention includes a receiving section that receives a control signal and an audio signal, and a transmitting section that transmits the control signal and the audio signal, and when setting up a line, performs data communication using the control signal, and After setting, in a wireless device capable of making a call using voice signals, an amplifier that amplifies the control signal and the voice signal, and an amplification of the amplifier so that the transmission output during voice communication is lower than the transmission output during data communication. This will be described in detail below with reference to the illustrated embodiments.

Embodiment of the Invention FIG. 1 is a schematic block diagram showing an embodiment of the present invention, in which 1 is a microphone for inputting an audio signal _AT , 2 is a microphone for inputting the audio signal _AT or transmission data _DT , for example, 900M
3 is a transmitter/ _receiver antenna, 4 is a switch, 5 is a receiver, 6 is a speaker that outputs the demodulated audio signal A _R , 7 is the demodulated received data. This is a logic control unit that receives D _R.

The logic control section 7 (1) switches the antenna switch 4 in response to the press talk signal PS, and also switches the antenna switch 4 on the transmitter 2.
(2) A function to send and receive data _DT and DR necessary for line settings; (3) A function to set the control channel during data communication, and a function to set the data DT and _DR necessary for line settings, and It has a function to set the communication channel, but in this example, the control channel is further controlled to produce the rated output (for example, 5W), and the speech channel is controlled to produce a lower transmission output (for example, 0.5W, which is 10dB lower). A function has been added to do this. 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 transmitting section 2, 22 is the first local oscillation signal 1st on the receiving side, which receives the frequency setting signal (for example, the frequency division ratio of PLL) N from the logic control section 7. .LO or a frequency synthesizer unit that oscillates the transmission carrier wave RF _T ; 23 is an audio amplifier that amplifies the audio signal _AT converted by the microphone 1;
24 is a low pass filter (LPF) called a splatter filter, which is included in the transmitter 2. Reference numeral 71 denotes an MSK modulation/demodulation section extracted from the logic control section 7, which performs MSK demodulation on the received data _DR and MSK modulation on the transmitted data _DT . MSK is Minimum
Abbreviation for Shift Keying.

The logic control section 7 distinguishes between the transmission mode and the reception mode by turning on/off the pre-talk signal PS from the pre-talk switch 8. Also, the receiving input level
It has a function of detecting the 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 call channel, it is set to H (high) when a control channel is selected, and L when a call channel is selected.
(low) transmission output control signal CTL can be output.

25 is a voltage control section that receives this control signal CTL and controls the gain of the power amplifier 21. The voltage control section 25 in this example is included in the transmission section 2, and is configured to send control signals.
When CTL is H, an analog gain control voltage CTL' is generated that makes the output RF _T of the power amplifier 21 rated (for example, 5 W). Moreover, when the control signal CTL is L, the power of the output RF _T of the power amplifier 21 is
It is a type of A/D converter that switches the gain control voltage CTL' to reduce it to 0.5W. Furthermore, CTL=
It is convenient if the transmission power of 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, it should not affect the transmission output when CTL=H.

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 is in a reception (standby) state on a control channel. When the pre-talk switch 8 is turned on in order to transmit, the logic control section 7 changes the N value while remaining in the reception mode, searches for communication channels, and searches for an empty channel with no reception input level LEV. When an empty channel is acquired, the N value is set to the desired value again, and the process returns to the control channel, and when it is confirmed that there is no receiving level LEV on the control channel, it is set to the transmission mode and transmits the calling data signal _DT . For the first time, the control signal
CTL becomes H, and the transmission output RF _T becomes the rated power. After transmitting the predetermined data signal _DT on the control channel in this way, the N value is changed and the process shifts to the captured idle communication channel. At the same time as this N value switching, the control signal CTL becomes L, so
After that, the transmission output RF _T 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 a short period (about 200 ms) during which the line is set up for data communication is at the rated output, and most of the rest of the call period is at a lower transmission output. As a result, the average power consumption is significantly reduced, and the 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 2 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 pre-talk switch, 22 is a power amplifier, and 25 is a voltage control section.

Claims (1)

[Claims] 1 It has a receiving section that receives a control signal and an audio signal, and a transmitting section that transmits the control signal and the audio signal, and performs data communication using the control signal when setting up a line, and performs data communication using the audio signal after setting up the line. A wireless device capable of making phone calls, including an amplifier that amplifies the control signal and the audio signal, and logical control that controls the amplification degree of the amplifier so that the transmission output during voice communication is lower than the transmission output during data communication. A wireless device comprising: