JP2797388B2 - Wireless communication equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described in the following order.

A Industrial Fields B Overview of the Invention C Prior Art D Problems to be Solved by the Invention E Means for Solving the Problems F Operation G Example G-1 Configuration and Operation of Implementation Sequence (FIGS. 1 to 4) (FIG. 4) G-2 Adjustment of the output level of the transmission signal in the embodiment (FIGS. 1, 4) G-3 Another embodiment (FIG. 5) G-4 Modification H Effect of the invention A Industrial BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication device that power-amplifies a transmission signal obtained by performing modulation based on a signal to be transmitted and wirelessly transmits the signal.

B SUMMARY OF THE INVENTION The present invention detects a level of a power-amplified transmission signal in a wireless communication device that forms a transmission signal by performing modulation based on a signal to be transmitted, and power-amplifies and wirelessly transmits the transmission signal. A level detector that performs power amplification of a transmission signal in accordance with a comparison output obtained by comparing a level of a detection output obtained from the level detector with a level of a reference voltage; A level attenuating section for performing level reduction adjustment of a detection output or a reference voltage obtained from the section in accordance with supplied data; an external connection section to which an external digital adjustment data transmitting section can be connected; A memory for storing digital adjustment data from the adjustment data transmitting unit; and a control unit for transmitting a transmission signal to an external connection unit. When an external digital adjustment data transmission unit for transmitting digital adjustment data for adjusting the digital connection is connected, the digital adjustment data obtained from the external digital adjustment data transmission unit via the external connection unit is stored in the memory. When the transmission signal is power amplified,
Digital adjustment data is read from the memory,
The read-out digital adjustment data or the digital adjustment data obtained based on the read-out digital adjustment data is supplied to the level attenuator as adjustment control data, so that the output level adjustment of the transmission signal can be easily and appropriately performed. In order to improve the production efficiency.

C Prior Art In a public car telephone system, which is a kind of mobile radio communication system, between a car equipped with a mobile radio telephone device and a general telephone subscriber, or between cars equipped with a mobile radio telephone device. Is made via a particular local radio station. A wireless communication device constituting a mobile radio telephone device in such a public car telephone system is assumed to transmit and receive a call voice signal. When transmitting a call voice signal, for example, a call is made to a predetermined carrier signal. A transmission signal is formed by performing frequency modulation using an audio signal, and the transmission signal is power-amplified and wirelessly transmitted. The output level of the transmission signal transmitted wirelessly in such a case is usually standardized.

Therefore, in the radio communication device constituting the mobile radio telephone device, the output level of the transmission signal, which is formed by performing frequency modulation using the speech voice signal as a modulation signal and is power-amplified, conforms to the standard. The setting of the output level of the transmission signal is required, for example, the power amplification of the transmission signal is performed by a level detection unit that detects the level of the power-amplified transmission signal, and a detection that is obtained from the level detection unit. In accordance with a comparison output obtained by comparing the output level and the reference voltage level, an output level adjustment unit that controls the power amplification state of the transmission signal is provided. This is performed by reducing and adjusting the level of the obtained detection output. In order to set the output level of the transmission signal, the level reduction adjustment of the detection output obtained from the level detection section for detecting the level of the power-amplified transmission signal is generally performed on the output side of the level detection section. A fixed resistor is provided, and the resistance value of the semi-fixed resistor is adjusted during the manufacturing process of the wireless communication device.

D Problems to be Solved by the Invention However, as described above, the power-amplified transmission signal for setting the output level of the transmission signal, which is performed in the manufacturing process of the wireless communication device constituting the mobile radio telephone device, is set. The level reduction adjustment of the detection output obtained from the level detection unit for detecting the level requires a cumbersome operation requiring a relatively large number of steps to strictly adjust the output level of the transmission signal to the standard. This is accompanied by the inconvenience.

In addition, the level reduction adjustment of the detection output obtained from the level detection unit that detects the level of the power-amplified transmission signal is performed according to the state of the circuit wiring board alone on which the electronic components constituting the signal paths for each signal are mounted. When the circuit wiring board after the adjustment is incorporated into the main body of the device, a situation may occur in which the output level of the transmission signal is slightly changed. It is necessary to readjust the level of the detection output obtained from the level detection unit that detects the level of the transmitted signal, which results in a significant decrease in the manufacturing efficiency of the wireless communication device.

In view of such a point, the present invention provides a method of forming a transmission signal by performing modulation based on a signal to be transmitted, power-amplifying the transmission signal and wirelessly transmitting the transmission signal, and adjusting an output level of the transmission signal. It is an object of the present invention to provide a wireless communication device capable of easily and appropriately performing the above-mentioned steps in manufacturing and improving the manufacturing efficiency.

E Means for Solving the Problems In order to achieve the above object, a wireless communication apparatus according to the present invention performs a modulation based on a signal to be transmitted to form a transmission signal, and amplifies power of the transmission signal. An output section, a transmission section for wirelessly transmitting a power-amplified transmission signal obtained from the output section, a level detection section for detecting a level of the power-amplified transmission signal obtained from the output section, and a level detection section. An output level adjusting unit for controlling a power amplification state in the output unit according to a comparison output obtained by comparing the level of the detection output with the level of the reference voltage, and a level for the detection output or the reference voltage obtained from the level detection unit A level attenuating unit that performs the reduction adjustment in accordance with the supplied adjustment control data, and changes the above-described comparison output in accordance with the adjustment control data; in addition thereto, An external connection unit to which an external digital adjustment data transmission unit for transmitting digital adjustment data for making the level of the power-amplified transmission signal obtained from the power unit conform to a predetermined level can be connected. And a memory for storing digital adjustment data from the external digital adjustment data transmission unit, and obtained from the external digital adjustment data transmission unit through the external connection unit when the external digital adjustment data transmission unit is connected to the external connection unit. When the digital adjustment data is stored in the memory and the transmission signal is supplied to the output unit, the digital adjustment data stored therein is read from the memory, and the read digital adjustment data or the digital adjustment data obtained based on the read digital adjustment data. Is supplied to the level attenuator as adjustment control data. And a control unit.

F Function In the wireless communication device according to the present invention having the above-described configuration, after the assembly in the manufacturing process is completed, the external digital adjustment data transmission unit is connected to the external connection unit, and the external digital adjustment data transmission unit is connected. Supplies digital adjustment data for level adjustment of a transmission signal from an external connection unit, and operates a control unit;
By simply storing the digital adjustment data obtained from the external digital adjustment data transmission unit through the external connection unit in the memory, the adjustment for adjusting the level of the transmission signal to the preset level can be performed. Then, after the digital adjustment data from the external digital adjustment data transmission unit is stored in the memory, the digital adjustment data stored therein is read from the memory by the control unit before being set to the transmission state, The read digital adjustment data or digital adjustment data obtained based on the read digital adjustment data is supplied to the level attenuator as adjustment control data, whereby the level attenuator detects the level of the power-amplified transmission signal. The detection output obtained from the section or the level reduction adjustment for the reference voltage is reliably performed according to the digital adjustment data from the control section. A detection output or a reference from a level attenuating unit that has been subjected to level reduction adjustment according to adjustment control data which is digital adjustment data read from such a memory or digital adjustment data obtained based on the digital adjustment data. The voltage causes a comparison output obtained by comparing the detection output and the reference voltage to take a level at which a transmission signal having a level matching a preset level is transmitted from the output. .

Therefore, the wireless communication device according to the present invention can easily and properly adjust the output level of the transmission signal at the time of manufacturing.

G. Embodiment G-1 Configuration and Operation of Embodiment (FIGS. 1 to 4) FIG. 2 shows an appearance of a radio communication device according to the present invention, and this embodiment forms a mobile radio telephone device. It has been.

The example shown in FIG. 2 includes a handset 11 and a cradle 12, and the handset 11 is connected to the cradle 12 via a cord 13. The handset 11 is provided with an audio input unit 14 with a built-in microphone and an audio output unit 15 with a built-in speaker.The handset 11 has a grip unit 16 that connects the audio input unit 14 and the audio output unit 15. On the upper surface side, a numeric key switch 17 pressed at the time of dialing or the like and a display unit 18 for displaying a telephone number and the like are provided. Also, cradle 12
Has a box body 20 composed of an upper half body 20a and a lower half body 20b, and incorporates a wireless transmission / reception unit therein. The structure inside the box 20 is as shown in FIG.
A first circuit wiring board 21 and a second circuit wiring board 22 are arranged with a chassis 23 interposed therebetween and supported by the chassis 23. The chassis 23 is formed by, for example, aluminum die casting in order to efficiently dissipate heat from circuit elements or components attached to the first and second circuit wiring boards 21 and 22, respectively.

The first circuit wiring board 21 includes a control unit 31, a memory 3
2. A circuit element such as a programmable attenuator 33 is mounted, and an interface connector 34 for external connection is further mounted. Interface connector 34
The upper half 20a of the housing 20 is positioned below an opening 24 provided in a portion on the first circuit wiring board 21,
As shown in FIG. 4, the connection surface 34a is made to face the opening 24. The opening 24 is opened and closed by a sliding lid 25 provided on the upper half 20 a of the housing 20.

On the other hand, the second circuit wiring board 22 includes a frequency modulation unit 35,
The output level adjuster 36, various circuit elements 37 constituting other circuit parts, and the like are mounted.

In the cradle 12, as shown in FIG. 2, a battery pack 38 containing a battery is detachably attached to a central portion of the upper half body 20a of the housing 20, and furthermore, FIG. As shown in the figure, box 20
On the side surface of the lower portion of the upper half body 20a, a retractable antenna 29 is provided.

As described above, an example of the circuit configuration of the wireless communication device according to the present invention, which is configured by various circuit elements or components mounted on the first and second circuit wiring boards 21 and 22, is a first configuration.
In the figures it is as represented by the block diagram.

In the block diagram shown in FIG. 1, a call voice signal Sa from a microphone 41 built in the handset 11 is amplified by an amplifier 42 and controlled by a level controller 43, and then a low-pass filter (LP)
F) supplied to 44. The call voice signal Sa that has passed through the low-pass filter 44 is supplied to the frequency modulation unit 35, and the carrier frequency signal having a predetermined frequency is frequency-modulated from the low-pass filter 44 and the call voice signal Sa from the frequency modulation unit 35. The transmission signal St formed is obtained and supplied to the output level adjustment unit 36.

In the output level adjustment unit 36, first, the frequency modulation unit
The transmission signal St from 35 is amplified by the amplifying section 46 and subsequently supplied to the power amplifying section 48. The power amplifying unit 48 is provided with a gain control unit, and the gain control unit includes:
Power amplified transmission signal St 'obtained from power amplification section 48
Level detector 49 for detecting the level of the signal, a programmable attenuator (PRO-ATT) 33 supplied with a detection output Vt obtained from the level detector 49, and a level-controlled detection output Vt obtained from the programmable attenuator 33. 'And the level of the reference voltage Vr from the reference voltage source 52 to generate a comparison output Vc, and includes a level comparison unit 51 for supplying the comparison output Vc to the control terminal of the power amplification unit 48. Have been.
The power amplifying unit 48 to which the comparison output Vc obtained from the level comparing unit 51 is supplied is configured such that the gain in power amplifying the transmission signal St from the amplifying unit 46 is controlled according to the comparison output Vc. The level of the power-amplified transmission signal St 'obtained from the power amplifying section 48 is changed according to the comparison output Vc.

Then, the power-amplified transmission signal St ′ obtained from the power amplifying unit 48 is supplied to the antenna 29 through the transmission / reception sharing unit 39, and is wirelessly transmitted from the antenna 29.

The programmable attenuator 33 constituting the gain control means provided in the power amplifying unit 48 detects the level of the power-amplified transmission signal St 'in a manner corresponding to the digital adjustment data Dc supplied from the control unit 31. A level reduction adjustment is performed on the detection output Vt obtained from the level detection section 49, and the detection signal Vt 'having undergone the level reduction adjustment is sent out, whereby the comparison output obtained from the level comparison section 51 is obtained.
Vc has a change according to the level change of the detection signal Vt '. Therefore, the gain of the power amplifier 48 controlled according to the comparison output Vc eventually becomes the digital adjustment data Dc
, So that the level of the power-amplified transmission signal St ′ obtained from the power amplifying unit 48 is changed in accordance with the digital adjustment data Dc.

Further, the reception signal Sr detected by the antenna 29 during the reception operation is transmitted to the reception processing system 40
Supplied to Then, the received call voice signal Sa ′ obtained from the reception processing system 40 is supplied to the speaker 47 built in the handset 11, and the received voice is emitted from the speaker 47.

G-2 Adjustment of Output Level of Transmission Signal in Embodiment (FIGS. 1 and 4) An example of the wireless communication apparatus according to the present invention having the above-described configuration and operation state is, for example, a manufacturing process. At the stage where the assembly is completed and the respective parts are adjusted, the sliding lid 25 provided on the upper half body 20a of the box 20 in the cradle 12 is operated, and as shown in FIG. After the opening 24 formed in the upper half 20a of the device 20 is opened, an external digital adjustment data sending unit for sending digital adjustment data for adjusting the level of the transmission signal is provided through the opening 24. Is connected to the interface connector 34 built in. Then, as shown in FIG. 1, the digital adjustment data Dc from the external digital adjustment data sending unit is transmitted to the interface
The signal is supplied to the control unit 31 through the connector 34.

The digital adjustment data Dc from the external digital adjustment data sending unit is supplied to the programmable attenuator 33 so that the programmable attenuator 33
For the detected output Vt from the level, the level of the power-amplified transmission signal St ′ obtained from the power amplifying unit 48 is subjected to a level reduction adjustment so that a result of obtaining an appropriate value conforming to the standard is obtained. Is selected.

Then, the control unit 31 supplied with such digital adjustment data Dc supplies the digital adjustment data Dc to the memory 32 and causes the memory 32 to store the digital adjustment data Dc.

After the digital adjustment data Dc is stored in the memory 32, when the transmission operation is performed, the control unit
Prior to the transmission state being taken, 31 reads the digital adjustment data Dc stored in the memory 32 and supplies the read digital adjustment data Dc to the programmable attenuator 33, thereby, as described above, In this state, the programmable attenuator 33 performs the level reduction adjustment according to the supplied digital adjustment data Dc on the detection output Vt from the level detection unit 49. As a result, the transmission operation is performed under the condition that the output level of the transmission signal St 'takes an appropriate value conforming to the standard.

By such an operation, the output level of the transmission signal St 'obtained from the power amplifying unit 48 has been adjusted.

G-3 Another Embodiment (FIG. 5) FIG. 5 shows an output level adjusting unit in another example of the wireless communication device according to the present invention. In the output level adjusting unit 36 'in such another example, the gain control means provided in the power amplifying unit 48 detects the level of the power-amplified transmission signal St' obtained from the power amplifying unit 48 by a level detection. Part 49,
A reference voltage source 52 for generating the reference voltage Vr, a programmable attenuator 33 to which the reference voltage Vr is supplied from the reference voltage source 52, and a level of the detection output Vt obtained from the level detection unit 49 and a level obtained from the programmable attenuator 33. And a level comparing section 51 for comparing the level of the reference voltage Vr 'with the level controlled to generate a comparison output Vc' and supplying the comparison output Vc 'to the control terminal of the power amplifying section 48. I have. The power amplifying unit 48 to which the comparison output Vc ′ obtained from the level comparing unit 51 is supplied is configured such that the gain in power amplifying the transmission signal St from the amplifying unit 46 is controlled according to the comparison output Vc ′, Thereby, the level of the power-amplified transmission signal St 'obtained from the power amplifying unit 48 is changed according to the comparison output Vc'.

Also in such an example, the programmable attenuator 33 performs the level reduction adjustment on the reference voltage Vr in a manner corresponding to the digital adjustment data Dc supplied from the control unit 31, and performs the level reduction adjustment on the reference voltage Vr ′. Is transmitted, whereby the comparison output Vc 'obtained from the level comparing section 51 has a change corresponding to the level change of the reference voltage Vr'. Therefore, the gain of the power amplifying unit 48 controlled according to the comparison output Vc ′ is, in the end, controlled according to the digital adjustment data Dc, whereby the power amplified obtained from the power amplifying unit 48 is amplified. Transmission signal
The level of St 'is changed according to the digital adjustment data Dc.

In the example including such an output level adjusting unit 36 ', the other parts are configured in the same manner as the example including the output level adjusting unit 36 shown in FIG. 1, so that the output level of the transmission signal St' is adjusted. 1 is performed in the same manner as in the case of the example including the output level adjusting unit 36 shown in FIG.

G-4 Modified Example In the above two examples, the digital adjustment data read from the memory 32 by the control unit 31 is used.
Dc is directly supplied to the programmable attenuator 33. However, the digital adjustment data Dc is based on them,
33 to provide a programmable attenuator 33
However, with respect to the detection output Vt from the level detection unit 49, the level at which the result that the level of the power-amplified transmission signal St ′ obtained from the power amplification unit 48 takes an appropriate value conforming to the standard is obtained. It is assumed that another digital adjustment data for performing the reduction adjustment is obtained, and based on the digital adjustment data Dc read from the memory 32 in the control unit 31, the another digital adjustment data described above is obtained. The data may be formed and provided to the programmable attenuator 33.

H Effects of the Invention As is apparent from the above description, in the wireless communication device according to the present invention, a transmission signal is formed by performing modulation based on a signal to be transmitted, and the transmission signal is power-amplified and wirelessly transmitted. After the completion of the assembly in the manufacturing process, an external digital adjustment data sending section for sending digital adjustment data for adjusting the level of the transmission signal is connected to the external connection section, and the external digital adjustment data sending section is connected. The digital adjustment data is supplied from the external digital connection data through the external connection unit, the control unit is operated, and the digital adjustment data obtained from the external digital adjustment data transmission unit through the external connection unit is stored in the memory. The level adjustment can be performed correctly, and therefore, the output level adjustment for the transmission signal. And easily at the time of manufacture, moreover, properly it can be carried out, thereby resulting in the improvement of production efficiency is achieved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a transmission / reception circuit in an example of a wireless communication device according to the present invention, FIG. 2 is a perspective view showing an appearance of an example of a wireless communication device according to the present invention, and FIG. 4 is a partially cutaway side view of a part of the example shown, FIG. 4 is a perspective view of a part of the example shown in FIG. 1, and FIG. 5 is a transmission / reception circuit configuration in another example of the wireless communication device according to the present invention. It is a block diagram which shows the part. In the figure, 11 is a handset, 12 is a cradle, 20 is a box,
29 is an antenna, 31 is a control unit, 32 is a memory, 33 is a programmable attenuator, 34 is an interface connector, 35 is a frequency modulator, 36 and 36 'are output level adjusters, 39 is a transmission / reception common unit, and 48 is power. An amplification unit, 49 is a level detection unit, 51 is a level comparison unit, and 52 is a reference voltage source.

Claims (1)

(57) [Claims] 1. A modulation section for modulating a signal to be transmitted to form a transmission signal, an output section for power-amplifying the transmission signal, and wirelessly transmitting a power-amplified transmission signal obtained from the output section. A level detector for detecting the level of the power-amplified transmission signal obtained from the output section, and a comparison obtained by comparing the level of the detection output obtained from the level detector with the level of the reference voltage. Depending on the output,
An output level adjustment unit for controlling a power amplification state in the output unit, and a detection output obtained from the level detection unit or a level reduction adjustment for the reference voltage is performed in accordance with supplied data; A level attenuator for changing according to data; and external digital adjustment data transmission for transmitting digital adjustment data for making the level of the power-amplified transmission signal obtained from the output unit conform to a predetermined level. An external connection unit to which a unit can be connected; a memory for storing digital adjustment data from the external digital adjustment data transmission unit; and the external digital adjustment data transmission unit connected to the external connection unit. At this time, the digital adjustment data obtained from the external digital adjustment data transmission unit through the external connection unit When the transmission signal is supplied to the output unit, the digital adjustment data stored in the memory is read from the memory, and the read digital adjustment data or the digital adjustment data obtained based on the read digital adjustment data is stored. And a controller that supplies the digital adjustment data to the level attenuator as the data.