JPH0761033B2 - Wireless communication device - Google Patents

Description

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

A Industrial field B Outline of invention C Conventional technology D Problems to be solved by the invention E Means for solving problems (Fig. 1) F Action G Example G1 One example (Fig. 1) , FIG. 2) G2 Other embodiment (FIG. 3) H Effect of the invention A Industrial field of application The present invention relates to a wireless communication device of a PLL synthesizer type suitable for, for example, a wireless microphone system.

B. SUMMARY OF THE INVENTION The present invention provides a wireless communication device including a master unit and a slave unit of a PLL synthesizer system, and a channel setting means for setting a channel of the PLL synthesizer of the master unit also enables the channel of the slave synthesizer of the slave unit to be set. The setting facilitates the setting of the wireless communication channel, downsizes the handset, and reduces its cost.

C Conventional Technology A PLL synthesizer (frequency synthesis) transmitter and receiver uses one crystal oscillator for a large number of channels in a predetermined frequency range, so a crystal oscillator is prepared for each channel. Compared to, it is economical and can be downsized.

Therefore, for example, the synthesizer system has come to be adopted in a wireless communication device including a portable transmitter, such as a commercial wireless microphone system. First, a conventional synthesizer type transmitter and receiver will be described with reference to FIG. 4 and FIG.

FIG. 4 shows a configuration example of a conventional synthesizer type transmitter (wireless microphone). In FIG. 4,
(10) shows a PLL synthesizer as a whole, and the output of a reference oscillator (11) using a crystal oscillator is a phase comparator (12).
Is supplied to the voltage-controlled oscillator (VC) as a control signal via the low-pass filter (13).
O) (14), and the oscillation output of the VCO (14) with fs frequency is divided by a programmable (variable) frequency divider (15) and supplied to a phase comparator (12). The oscillation output of the VCO (14) is transmitted through the high frequency power amplifier (16) to the transmitting antenna _AT.
Is supplied to. The audio signal from the microphone M is supplied to the input of the VCO (14) via the audio amplifier (17), and V
The oscillation frequency fs of CO (14) is frequency-modulated.

(20) shows the transmission channel setting section as a whole, and the microprocessor (CPU (21) stores the frequency division table of the frequency divider (15) for each channel stored in the ROM (22) as a channel selection switch. It is read according to the channel designation by (23), and the frequency divider (1
Supply control data to 5). A counter (not shown) of the frequency divider (15) is preset by this control data, and the frequency division ratio of the frequency divider (15) is set to a predetermined value N _T.

A synthesizer type receiver that receives radio waves from the wireless microphone as described above has a dual superheterodyne configuration as shown in FIG.
The received high frequency signal of frequency fs from A _R is supplied to the first frequency mixer (32) via the high frequency amplifier (31).
The oscillation output of the synthesizer (40) as the first local oscillator is supplied to the first mixer (32), and the received high frequency signal is subjected to the first intermediate frequency fi conversion of 49.4 MHz, for example.

The output of the first mixer (32) is supplied to the second frequency mixer (34) via the first intermediate frequency amplifier (33). The output of the second local oscillator (35) is supplied to the second mixer (34), and the second mixer (34) outputs the output of the first intermediate frequency from the first intermediate frequency, for example.
Converted to a second intermediate frequency of 10.7MHz. The second local oscillator (35) is a fixed frequency oscillator using, for example, a crystal oscillator.

The output of the second mixer (34) is supplied to the FM demodulator (37) via the second intermediate frequency amplifier (36). The output of the FM demodulator (37) is supplied to the low frequency amplifier (38), and the output of the low frequency amplifier (38) is supplied to the speaker SP.

The synthesizer (40) for the first local oscillation has substantially the same configuration as the synthesizer (10) of the transmitter described above. That is, the output of the reference oscillator (41) using a crystal oscillator is supplied to the phase comparator (42), and the output of the phase comparator (42) is supplied to the voltage controlled oscillator () via the low-pass filter (43). VCO) (44)
Is supplied to the phase comparator (42) after being divided by the programmable (variable) frequency divider (45). The oscillation output of VCO (44) is the first mixer (32)
Is supplied to.

(50) shows the receiving channel setting section as a whole, and the microprocessor (CPU) (51) selects the frequency division table of the frequency divider (45) for each channel stored in the ROM (52). Reads according to the channel designation by the switch (53), and the frequency divider (4
Supply control data to 5). A counter (not shown) of the frequency divider (45) is preset by this control data, and the frequency division ratio of the frequency divider (45) is set to a predetermined value N _R.
In this case, for the same channel, if the oscillation frequencies of the VCOs (15) and (45) of the synthesizers (10) and (40) on the transmitting side and the receiving side are fs and fl, respectively, the difference between the two will occur. It is equal to the first intermediate frequency fi of the receiver. That is | f
s−fl | = fi holds. Further, since both the transmitter and the receiver correspond to channels having the same interval, the frequencies of the reference oscillators (11) and (41) of both synthesizers (10) and (40) are set equal to the channel interval. Therefore, the VCOs (14) and (44) of both synthesizers (10) and (40)
The relationship of fs / N _T = fl / N _R is established between the oscillation frequencies fs and fl of N and the frequency division ratios N _T and N _R of the frequency dividers (15) and (45). The reception channel number set by the selection switch (53) is displayed on the liquid crystal display device (54).

D Problems to be Solved by the Invention By the way, in the US, for example, VHF Television 7
An empty channel from channels to 13 channels (174MHz to 216MHz) is assigned as the frequency band used for the wireless microphone system. Each TV channel (TV) from 7 to 13 channels is further divided as a channel for a wireless microphone at 200 KHz intervals, and a channel for a 24-wave wireless microphone is allocated within one TV channel. Therefore, a total of 168 channels of wireless microphones are allocated between channels 7 and 13 of TV Jiyoung. Note that TV channels are allocated every other channel to one area, so in one area,
The empty channel of a channel is only an odd channel or only an even channel.

The following procedure is used to select one channel from such many channels for wireless microphones. At the transmitting side and the receiving side, the same empty TV channel is first selected by the TV channel switch (23), (53), which is omitted in the figure, from the channel selection switches (23) and (53), and then WM is also omitted in the figure. The channel switch selects the same one of the 24 wireless microphone channels in the empty TV channel. Then, both the transmitter and the receiver are operated to check the reception state, and sometimes the presence or absence of interference by an external telephone or noise. If it is found that the channel to be used is being disturbed by external radio waves or noise due to the reception status check, each time the channel is changed by the same procedure as above, the interference is blocked. I try to avoid it. However, in order to avoid the interference as described above, it is necessary to change the channels of the transmitter and the receiver at once without changing them, and there is a problem that it is actually a very troublesome work.

In addition, the transmitter of the wireless microphone is required to be particularly small, and since the TV channel switch and WM channel switch (both of which are rotary type) itself and the channel display portion are small and the display scale interval is small. , There was a problem that it was difficult to accurately match the transmitter channel to the receiver channel. The problem with the above channel settings is that when using multiple wireless microphones with multiple channels,
This is a particularly big problem.

This means that when using a plurality of channels, even if 36 or 48 channels are allocated to one area as described above, for example, a channel that is disturbed by third-order intermodulation is substantially This is because it cannot be used. As already disclosed in Japanese Patent Application No. 59-134,498 by the present applicant, among the 24 channels of the wireless microphones assigned to one TV channel, it is possible to use, for example, 6 simultaneously without mutual interference. It is a combination of channels. Since special conditions are added to this combination, it is difficult to select which combination is appropriate. If this selection is not done properly, it is not possible to use multiple microphones at the same time, even in a wireless microphone system that can cover a large number of channels, due to mutual interference.

Furthermore, providing the transmitter and the receiver with the channel setting mechanism as described above and mounting a microprocessor or the like has a problem in that cost reduction and especially size reduction of the transmitter are hindered. .

When the transmitter is downsized by removing the channel setting mechanism and the microprocessor, it is possible to control the variable frequency divider of the synthesizer by external data, as shown in FIG. In Fig. 6, (15P)
Is a parallel data input type variable frequency divider, and parallel data for frequency division ratio setting is supplied from a control data input terminal (24). The output of the VCO (14) is mixed with the output of the local oscillator (19) in the mixer (18), and the frequency fd of the difference between the two is output.
(For example, 20MHz) converted to parallel type variable frequency divider (15P)
Is supplied to the variable frequency divider (15P) and is divided by a frequency division ratio nt smaller than the frequency division ratio _NT of the variable frequency divider (15) of FIG. 4 to the phase comparator (12). Supplied. The remaining structure is the same as that of the synthesizer (10) shown in FIG. The parallel data input type variable frequency divider (15P) has a low upper limit of the input frequency and does not operate with the signal of the channel for the wireless microphone in the 200MHz band, so the input frequency must be lowered as described above. Therefore, there is a problem that the circuit becomes complicated and that mechanical and circuit measures are required to prevent the generation of spurious components due to the use of the mixer.

In view of such a point, an object of the present invention is to provide a wireless communication device which has a simple configuration, is easy to set a channel, and can be downsized and reduced in cost.

E Means for Solving Problems The present invention provides a plurality of transmitters TXA, TX of the PLL synthesizer system.
In a wireless communication device including B, TXC and receivers RXA, RXB, RXC, a channel setting means (50M) including a microprocessor (51) provided in at least one of the plurality of receivers, and a plurality of transmitters. Control data input terminals (25A), (25B), (25
C) and a control data output terminal (5 provided on a receiver RXA having a channel setting means (50M) including at least one microprocessor (51) among a plurality of receivers.
5) and the control data input terminals (57B) and (57C) provided on the remaining receivers RXB and RXC.
At least one control data output terminal (55) and control data input terminals (25A), (25) of multiple transmitters TXA, TXB, TXC
B), (25C) and the control data input terminals (57B), (57C) of the remaining receivers RXB, RXC are connected by a cable (56),
All transmitters TXA, TX by channel setting means (50M)
Set the channel of each synthesizer of B, TXC and receiver RXA, RXB, RXC, and set the channel setting means (50
Each transmitter TX via the channel set by M)
Acoustic waves are transmitted from A, TXB, TXC, and each receiver RXA, RXB, RXC
The wireless communication device is characterized by receiving acoustic radio waves.

According to this configuration, the transmitter and the receiver are easily and reliably set in the same channel, the cost of the system is reduced, and the other device that does not need the channel setting means is downsized.

G Embodiment G1 Embodiment An embodiment of the wireless communication device according to the present invention will be described below with reference to FIGS. 1 and 2. The configuration of one embodiment of the present invention is shown in FIG. In FIG. 1, parts corresponding to those in FIGS. 4 and 5 are designated by the same reference numerals, and duplicate description will be omitted. In FIG. 1, TX indicates a transmitter as a whole, and this transmitter TX is composed of a synthesizer (10), a high frequency power amplifier (16) and an audio amplifier (17), and a variable frequency divider (of the synthesizer (10) ( A control data input terminal (25) is connected to 15). The transmitter of this embodiment does not include a transmission channel setting unit like the conventional transmitter shown in FIG. The RX shows the parent receiver as a whole, and has a synthesizer (40) as a first local oscillator and a channel setting means (50M). The parent receiver RX has the same structure as the receiver shown in FIG. 5, and the illustration of the second mixer (34) to the speaker SP is omitted in FIG. 1 for simplicity. The control data output terminal (55) connected to the CPU (51) of the parent receiver RX and the control data input terminal (25) of the transmitter TX are connected by the cable (56), and The clock and the serial data for control are supplied from the CPU (51) to the variable frequency divider (15) of the transmitter TX.

Next, with reference to the flow chart of the channel setting unit (50M) in FIG. 2, the operation at the time of channel setting of this embodiment will be described.

With the channel selection switch (53) of the receiver RX, 1
When a channel for one wireless microphone in one TV channel is specified, the CPU (51) reads the data of this channel selection switch (53) (step) and outputs the channel data corresponding to the specified channel.
Read from ROM (52M) (step). Variable frequency divider (45) of receiver RX from this read channel data
The frequency division ratio N _R is calculated by the CPU (51) (step), serial control data is supplied, and the variable frequency divider (45) is set (step). Next, the CPU (51) calculates the frequency division ratio _NT of the variable frequency divider (15) of the transmitter TX corresponding to the designated channel from the channel data read in step (step), and the cable (56). Through the, the serial control data is supplied to the variable frequency divider (15) of the transmitter TX, and the frequency divider (15) is set (step).

Thus, the frequency division ratios of the frequency dividers (15) and (45) of both synthesizers (10) and (40) are set to predetermined values N _T and N _R , respectively, when the power is turned on or the channel is changed. , The transmitter TX and the parent receiver RX are set to the channel for the same wireless microphone.

In this way, when the wireless microphone system with the channel set is disturbed by external radio waves or noise, the master receiver RX and the master receiver RX can be operated by one operation of the selection switch (53) of the master receiver RX in the same procedure as described above. The channels of transmitter TX can be reconfigured at the same time to avoid interference.

To ensure the transmitter TX channel settings, make sure that the power on / off status of the transmitter TX is
It is preferably displayed on the display device (54) of the parent receiver RX via 6).

According to this embodiment, the channel setting unit (50
M) is a local oscillator synthesizer (40) variable frequency divider (4
5) The frequency division ratio N _R is set, and the variable frequency divider (1) of the transmitter TX synthesizer (10) is set via the cable (56).
Since the dividing ratio _NT of 5) is also set, the transmitter TX
And the channel setting of the parent receiver RX can be done easily and surely. Further, since the channel setting means of the transmitter TX is unnecessary, the transmitter TX can be downsized and its cost can be reduced.

The present invention has been described above using a single wireless microphone. However, in a production site of a television program, the director and the operator of various devices such as a camera, lighting, and voice are contacted (so-called intercom). In the case of wireless 1 channel as well, the transmitter for each operator's response is configured in the same way as the transmitter TX in FIG. 1, and the control data from the master receiver is input to the control data input terminal of each transmitter. If they are commonly supplied, the channels of a plurality of transmitters can be easily and reliably set in the same manner as described above.

G2 Other Embodiment Next, another embodiment of the present invention, which is suitable for use of a plurality of channels, will be described with reference to FIG. FIG. 3 shows the configuration of the main part of another embodiment of the present invention. In FIG. 3, TXA, TXB and TXC respectively show a transmitter (wireless microphone) as a whole, RXA shows a parent receiver as a whole, and RXB and RXC show child receivers as a whole. The three transmitters TXA, TXB, and TXC are channels A, B, and C, which require different wireless microphones, respectively.
Which uses the transmitter TX shown in FIG. 1 above.
The same reference numerals are added to the parts corresponding to those in FIG. 1 and the subscripts A, B and C representing the respective channels are added to omit the duplicated description. The parent receiver RXA is the first
The same configuration as the parent receiver RX shown in the figure, two child receivers RXB and RXC are configured by removing the channel setting unit (50M) from the parent receiver RX shown in FIG. 1, respectively. In order to receive the radio waves transmitted from the above-mentioned transmitters TXA, TXB and TXC, the parts corresponding to those in FIG. 1 that are common to the respective receivers RXA, RXB and RXC have the same reference numerals respectively. Subscript
A, B and C are added and duplicate description is omitted. In addition, in FIG. 3, each synthesizer (10A), (10B),
Part of (10C), (40A), (40B), (40C) is omitted.

Control data output terminal (55) of channel setting section (50M) of parent receiver RXA and control data input terminals of synthesizers (10A), (10B) and (10C) of three transmitters TXA, TXB and TXC (25A), (25B) and (25C) are cables (5
6) is connected by. Meanwhile, two child receivers RXB and
Control data input terminals (57B) and (57C) are connected to the variable frequency dividers (45B) and (45C) of the RXC synthesizers (40B) and (40C), respectively. Also, (57C) are connected to the control data output terminal (55) of the channel setting section (50M) of the parent receiver RXA via the cable (56).

The operation of this embodiment is as follows.

As disclosed in Japanese Patent Application No. 59-134,498, there is a specific combination of channels that do not interfere with each other when using multiple wireless microphones simultaneously.
That is, when six or less wireless microphones are used at the same time, three groups are set with one specific channel for wireless microphones as one group for each TV channel. Also, if more than 7 microphones are used at the same time, a total of 13 channels can be used across each TV channel in areas where the empty channels of the TV channels are odd channels, and in an area of even channels, each channel can be used in each channel. A total of 11 channels can be used across.

The ROM (52M) of the channel setting unit (50M) of the parent receiver RXA stores the channel data of the specific combination as described above. In this embodiment, three transmitters TXA, TXB
, And TXC are used at the same time, and when one TV channel and the required number of channels are instructed to the CPU (51) by the channel selection switch (53), three wireless channels are selected from one group in this TV channel. Channel data for channels A, B and C for microphones is stored in ROM (52
M). Similarly to the case of the above-described embodiment, first, from the read data of the A channel, the frequency division ratio N _RA of the variable frequency divider (45A) of the parent receiver RXA is determined by the CPU (51).
Is calculated, the serial control data is supplied, and the variable frequency divider (45A) is set. Next, from the read A channel data, the variable frequency divider (1
Dividing ratio N _TA of 5A) is calculated by the CPU (51), serial control data is supplied, a variable frequency divider (15A) is excisional.
Furthermore, from the read data of channels B and C,
In exactly the same manner as described above, the variable frequency dividers (45B) of the dual receivers RXB and RXC and the second and third transmitters TXB and TXC.
And (45C) and (15B) and (15C) each of the frequency division ratios N _RB and N _RC and N _TB and N _TC are sequentially calculated by the CPU (51), and each variable frequency divider (45B), (45C) , (15B), (15C) are set respectively. In this case, an appropriate address is attached to each transmitter and receiver and the corresponding control data.

In this way, when the wireless microphone system set for one group in one TV channel is disturbed by an external telephone or noise, by the same procedure as above, one operation of the selection switch of the parent receiver RXA ,
Reconfigure each channel group of the parent receiver RXA, the three transmitters TXA, TXB and TXC and the two child receivers RXB and RXC, and also the TV channel to avoid interference. You can

In the case of this embodiment, the parent and child receivers RXA, RXB and RXC
A single rack is installed together, and a housing panel for housing multiple transmitters TXA, TXB and TXC is mounted on the same rack, and a cable (56) is used between the parent receiver RXA and both child receivers RXB and RXC. By connecting and connecting cables (56) on the accommodation panel, the connection with the master receiver RXA is completed when each transmitter is accommodated in this accommodation panel.
In addition, a secondary battery may be used as a power source for each transmitter, and a charging device may be provided on the accommodation panel so that the secondary battery of each transmitter is charged when each transmitter is accommodated in the accommodation panel. Therefore, each transmitter can be surely set to the channel setting state, and can be handled more conveniently as a wireless microphone system.

According to this embodiment, the channel setting unit (5
0M), the parent receiver RXA itself, multiple child receivers RXB, RXC
Also, the channels of the plurality of transmitters TXA, TXB, and TXC can be easily and surely set so that mutual interference does not occur. Further, since the channel setting unit (50M) may be provided only in the parent receiver RXA, the transmitter can be downsized and the cost of the system can be further reduced.

The present invention has been described above in the case where the receiver side does not move, but the present invention can be similarly applied to the case where the transmitter side does not move.

Further, although the modulation type is frequency modulation in the above-mentioned embodiment, it may be phase modulation or amplitude modulation may be used depending on the application.

H Effect of the Invention As described in detail above, according to the present invention, the channel setting means is provided by using one of the synthesizer type transmitter and the receiver as a master device, and by this channel setting means,
Since the channel of the synthesizer of the other handset is also set, the channel can be easily and surely set, and the handset can be downsized, and a wireless communication device capable of reducing its cost can be obtained. .

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of a wireless communication apparatus according to the present invention, FIG. 2 is a flow chart for explaining the operation of the embodiment of the present invention, and FIG. 3 is another embodiment of the present invention. Block diagrams showing the configuration of the main part of the embodiment, and FIGS. 4 and 5 are block diagrams showing the configuration example of a conventional transmitter and receiver.
FIG. 6 is a block diagram showing another configuration example of a conventional transmitter. (10), (10A), (10B), (10C), (40), (40
A), (40B), (40C) are synthesizers, (50M) are channel setting means, (51) is a microprocessor, TX, TX
A, TXB, TXC are transmitters, and RX, RXA, RXB, RXC are receivers.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H04Q 7/12

Claims (1)

[Claims] 1. A wireless communication device comprising a plurality of PLL synthesizer type transmitters and receivers, wherein at least one of the plurality of receivers includes a channel setting means including a microprocessor, and a plurality of the plurality of receivers. A control data input terminal provided in each transmitter for channel setting, a control data output terminal provided in a receiver having a channel setting means including at least one microprocessor of the plurality of receivers, A control data input terminal provided on the remaining receivers, and at the time of channel setting, the control data output terminal of the at least one receiver, the control data input terminals of the plurality of transmitters, and the remaining receivers. Connect to the control data input terminal with a cable, and use the channel setting means to select the synthesizer channels of all the transmitters and receivers. A wireless communication characterized by setting a channel and transmitting an acoustic wave from each of the transmitters through the channel set by the channel setting means and receiving the acoustic wave at each of the receivers during wireless communication. apparatus.