JP2514160B2 - Audio power control method - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to audio power control of a communication device, and more particularly to audio power control of a communication device having a wide power supply voltage range.

[0002]

2. Description of the Related Art The structure of a portable communication device is shown in FIG. The communication device is composed of a receiving unit 1 and a transmitting unit 2. The power source of this communication device is used by mounting the detachable battery pack 3. Reference numeral 4 denotes an antenna, and the communication device uses a CPU to perform various settings and controls.

In the case of actual communication, a small amount of power is sufficient when the communication partner station is near, but it is within the allowable range of the communication device when it is far away or when communication conditions are bad such as a noisy place or a valley of a building. It is used for different purposes such as communicating with a large transmission power. The transmission power cannot be changed in the circuit of the communication device, but instead, it is made possible by using a high battery power voltage and a low battery power voltage. Normally, a battery pack of 4.8V, 7.2V, 9.0V, 12.0V or the like is used as a portable battery pack. It can be freely changed within the maximum transmission rating of the communication device. In the case of such a portable communication device, the maximum value of the audio power of the received sound is set as the maximum value of the highest voltage power supply used.

As an example, the difference in maximum distortion-free audio power when using a battery pack with a voltage of 9.0 V and a battery pack with a voltage of 4.8 V is about four times. Therefore, if the audio power is set to the maximum with the battery pack of 9.0, the audio power of the battery pack of 4.8V is only about 1/4, and the effective variable range Vr of the range that can be controlled without distortion is controlled.
The de-range (hereinafter referred to as Vr de-range) cannot be taken, and the variable range of the volume variable control is substantially reduced.

[0005]

In the case of a portable communication device that uses a plurality of battery packs having different voltages, the power control setting of the audio circuit of the receiving section is the highest when the highest voltage battery pack is used. Variable control was decided based on power. Therefore, when the low voltage battery pack is used, the volume variable Vr de range becomes narrow. In particular, in the system using the electronic volume, since the value of one variable step is constant, the number of variable steps is extremely smaller than that for high voltage, and the adjustment of the audio output may be inconvenient. An object of the present invention is to improve an audio power control method that occurs due to such a difference in voltage power supply.

[0006]

In a communication device in which a plurality of battery packs having different voltages can be attached and detached, a CPU that detects a signal when a power switch is turned on or when transmission is switched to reception is , A / D from resistance for battery voltage detection
Discriminating means for digitally converting the voltage with the converter to take in a signal and discriminating the voltage of the battery pack, and means for storing control data set in advance for each voltage of the battery pack in the memory,
The control data of the memory corresponding to the voltage discriminated by the discriminating means is read out, and the signal analog-converted by the D / A converter is supplied to the attenuator of the audio circuit for control.

When the power control of the audio circuit is an electronic volume, the audio power control is set by selecting from 8 steps from 0 to 7, while the control data stored in the memory is 1 depending on the voltage of each battery pack. The control data of the step is, for example, 16 bits at 4.8 V, 7.2
24 bits for V, 32 bits for 9.0 V, 12.0
In V, 40 bits are stored. The electronic volume is controlled by D / A converting the product of the control data of the memory corresponding to the voltage determined by the determining means and the step value set by the electronic volume, and supplying the result to the electronic volume. The output is 0 at step 0 of the electronic volume,
The maximum value in step 7 is 32 bits when the voltage is 9.0V.
It is 224 bits in × 7. It is possible to make the same control selection by giving a difference in one step value of the control data stored in the memory for each battery pack voltage.

[0008]

In the battery pack to be used, the control value or control pulse proportional to each voltage is stored in the memory in advance, and when the signal when the power is turned on or the transmission is switched to the reception is detected, the CPU outputs the voltage information. It is taken in through the A / D converter and the voltage of the battery pack is determined. The control data of the memory corresponding to the determined voltage is read. If this data is a numerical value for the attenuator, the corresponding control in the attenuator control 0 to 3 of the attenuator control is performed.
Further, when the electronic volume is used, the control data for each step is stored in the memory. Therefore, the numerical value obtained by multiplying the step value selected from 0 to 7 of the electronic volume by one step is converted into an electronic value and converted into an electronic value. Control the audio power by supplying it to the volume

[0009]

FIG. 1 is a block diagram of audio power control of a communication device showing an embodiment of the present invention. The figure will be described. In the figure, 4 is an antenna, 2 is a transmitter, and 3 is an RF for reception.
・ Tuner composed of IF amplifier circuit, 9 is detection circuit, 1
Reference numeral 0 is an attenuator, 14 is a variable resistor, 11 is an audio power amplifier, and 12 is a speaker. 5 is a CPU,
6 is an A / D converter, and 7 is a D / A converter.

The receiving unit of the communication device having the above configuration will be described with reference to the flowchart of FIG. The received signal input from the antenna to the tuner unit 8 and amplified is detected by the detection circuit 9
Becomes an audio signal. For this audio signal, the output level of the audio power amplifier 11 is set by the attenuator 10 and the volume control variable resistor 14, and the speaker 12 is set.
Output audio from. In this receiving operation, the control of the audio power is controlled by the flowchart of FIG.
First, when the transmission is switched to the reception by the transmission / reception switching PTT switch (not shown), the CPU judges the reception, and the voltage information is taken in from the resistor through the A / D converter by the judgment boxes 18, 19, 21, 23. Determine the voltage of the connected battery pack. 4.8V for the battery pack,
There are 7.2V, 9.0V, 12.0V, etc., and one of them is determined. On the other hand, the control data corresponding to the voltage is stored in the memory in advance, that is, 0 at 4.8V and 7.2V.
1 is control data, 9.0 V is 2 and 12.0 V is 3. This numerical value is control data of the attenuator 10, and for example, one having a resistance value of 1 and two having a resistance value of 2 are connected in series as shown in FIG. 1, and each resistance is provided with a short circuit by a switch. At 4.8V, input control is not performed by a short circuit for all resistance values, and at 7.2V, resistance value 2 is short-circuited and input is controlled at resistance value 1.
At 9.0 V, the resistance value 1 is short-circuited and the resistance value 2 controls the input. At 12.0 V, resistance 1 and resistance 2 provide maximum control. Therefore, when the battery pack is determined to be 9.0 V, the corresponding control data 2 is read from the memory and the attenuator is controlled via the D / A converter 7 in step 26. The control of the attenuator 10 is set to the maximum audio power for each voltage. Next stage variable resistor 14
Since the desired audio power can be set with, the Vr derange does not change greatly at any battery pack voltage.

FIG. 2 is a block diagram of audio power control of a communication device showing another embodiment of the present invention. The figure will be described. In the figure, 4 is an antenna, 8 is a tuner section, 9 is a detection circuit, 11 is an audio power amplifier, and the audio power of this circuit is controlled by an electronic volume 13.
Reference numeral 5 is a CPU, 6 is an A / D converter, and 7 is a D / A converter.

The operation of the above circuit will be described with reference to the flowchart of FIG. If it is judged that the received signal is received in the judgment box 29, the voltage information of the battery pack is taken into the CPU 5 from the A / D converter 6 and processed 31, 32, 34, 3
Judge with 6. On the other hand, the electronic volume 13 is 0 in the memory.
If you can set from 8 to 7 steps, 1
The step control data is set for each voltage of the battery pack and stored in the memory. Control data per step 4.
16 bits at 8V, 24 bits at 7.2V, 9.0
It becomes 32 bits at V and 40 bits at 12.0V.
This one-step control data is multiplied by each step value of 0 to 7, and the data value is used as control data. Therefore, when the battery pack is determined to be 9.0 V, 32 bits of the corresponding control data is read from the memory into the register. Next, when 3 steps of the electronic volume 13 are selected in the judgment box 39, control data of 32 bits × 3 becomes 96 bits, which is analog-converted by the D / A converter and supplied to the electronic volume 13 to obtain the audio power corresponding to the 3 steps. Take control.

In this way, by changing the 1-step control data of the electronic volume according to the voltage of each battery pack, the stepwise control from 0 to 7 is made possible and the Vr derange is secured. Some communication devices display the battery voltage by discriminating it. In such a case, it is not necessary to newly provide a voltage discrimination circuit, and the discrimination data can be used. The control data values described in the embodiments are not fixed and may be changed as needed.

[0014]

According to the audio power control of the communication device according to the present invention, when a plurality of battery packs having different voltages are used properly, the voltage is discriminated and the audio power is optimized in accordance with the voltage. It can be set. Further, even when the electronic volume is used to variably control about 8 steps, the maximum audio power corresponding to the voltage is set by the voltage discriminating means, and the equal division control of 8 steps is possible. There is an effect that the Vr derange can be sufficiently selected regardless of the voltage of the battery pack.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an audio power control circuit of a communication device showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of an audio power control circuit of a communication device showing another embodiment of the present invention.

FIG. 3 is a flow chart for explaining the operation of FIG.

FIG. 4 is a flow chart for explaining the operation of FIG.

FIG. 5 is a configuration diagram of a communication device.

[Explanation of symbols]

 1 Receiver 2 Transmitter 3 Battery Pack 4 Antenna 5 CPU 6 A / D Converter 7 D / A Converter 8 Tuner 9 Detection Circuit 10 Attenuator 11 Audio Power Amplifier 12 Speaker 13 Electronic Volume 14 Variable Resistor

Claims (2)

(57) [Claims] 1. A CPU-controlled communication device capable of using different voltage power supplies, a determining means for determining a battery pack voltage, a means for storing control data corresponding to the battery pack voltage in a memory in advance, and the voltage. An audio power control method comprising: means for setting the variable attenuator of the audio power amplifier circuit to the maximum audio power output by the control data of the memory corresponding to the voltage determined by the determining means of. 2. A communication device for controlling an audio power amplifier with an electronic volume, means for pre-storing data of one step of the electronic volume in a memory for each battery pack voltage, step value selected by the electronic volume, and the step value. 2. The audio power according to claim 1, further comprising means for performing arithmetic processing on the data read from the memory corresponding to the voltage discriminated by the discriminating means and supplying the data to the electronic volume to control the output of the audio power amplifier. Control method.