JPS6238622A - Radio communication equipment - Google Patents

Abstract

PURPOSE:To facilitate the setting of a channel and to attain miniaturization by using a channel setting means provided to one of a transmitter and a receiver of both synthesizer system so as to set the channel of both the synthesizers. CONSTITUTION:A receiver RX is provided with a channel setting means 50M. When a channel for a wireless microphone is designated by a channel selection switch 53 of the receiver RX, a CPU 51 reads a channel data corresponding to a designated channel from a ROM 52M. Then, the frequency division ratio NR of a variable frequency divider 45 of a synthesizer 40 of the receiver RX is operated to apply a serial control data thereby setting the variable frequency divider 45. Then, the frequency dividing ratio NT of a variable frequency divider 15 of a synthesizer 10 of the transmitter TX corresponding to the designated channel from the read channel data is operated by the CPU 51, a serial control data is fed to the variable frequency divider 15 of the transmitter TX via a cable 56 to set the frequency divider 15. Then the transmitter TX and the receiver RX are set to the same channel.

Description

[Detailed description of the invention] iJ5 according to the present invention in the following order? , UpJ.

A Industrial field of application B Summary of the invention C Prior art D Problem to be solved by the invention E Means for solving the problem (Fig. 1) F Effect G Example Gl - Example (Fig. 1) , FIG. 2) G2 Other Embodiments (FIG. 3) Effects of the Invention A Industrial Application Field The present invention relates to a PLL synthesizer type wireless communication #Vc suitable for, for example, a wireless microphone 7 stem.

B. Summary of the Invention The present invention provides a wireless communication device comprising a base unit and a slave unit, both of which are based on a PLL synthesizer system, in which channel setting means for setting the channel of the PLL synthesizer of the base unit also sets the channel of the PLL synthesizer of the slave unit. This facilitates the setting of wireless communication channels, reduces the size of the handset, and reduces its cost.

C. Conventional technology PLL synthesizer (frequency base #:) type transmitters and receivers use one crystal oscillator for many channels in a predetermined frequency range, so a crystal oscillator is prepared for each channel. It is more economical and can be made smaller.

For this reason, for example, the synthesizer method has come to be adopted in wireless communication (N) devices including portable transmitters, such as professional wireless microphone systems. A conventional synthesizer type transmitter and receiver will be explained with reference to the following.

An example of the configuration of a conventional synthesizer type transmitter (wireless microphone) is shown in FIG. In this Figure 4,
G0 shows the PLL synthesizer as a whole, in which the output of the reference oscillator αυ using a crystal oscillator is supplied to the phase comparator α, and the output of the phase comparator αυ is fed to the low-pass filter (IW
Through the voltage controlled oscillator (VCO) as a control signal
(14) The oscillation output of the VCOH which is supplied with Ic and whose frequency i is fs is divided by a programmable (f) frequency divider ucN and supplied to the phase comparator α.

The oscillation output of the VCO α4 is supplied to the transmitting antenna ATiC via the high frequency power amplifier συ. Microphone M
The audio signal from the VCO is passed through the audio amplifier (17).
The oscillation frequency fs of the VCO (141 is not supplied to the human power of the VCO (141) and is frequency modulated.

■ indicates the transmission channel setting section as a whole, and the microprocessor (CPU 721) reads out the table of division ratios of 4 divisions for each channel stored in the ROM@ according to the channel specification by the channel selection switch (c). , is supplied with control data for the divider register of the synthesizer.This control data presets the counters (not shown) of the dividers a~, and sets the division ratio of the divider α$ to a predetermined value NT.

A synthesizer type receiver (77 units) that receives radio waves from a wireless microphone as described above has a double superheterodyne configuration, as shown in Figure 5, and receives high frequency reception of frequency fs from antenna AR (N is , a high frequency amplifier C31) to the first frequency rationalizer 04.The first mixer trowel is supplied with the oscillation output of a synthesizer (40) serving as a first local oscillator, and the damaged high frequency signal is, for example, 49 The signal is converted to a first intermediate frequency fl of .4■h.

The output of the first mixer c32 is supplied to the second frequency rationalizer (b) via the first intermediate frequency amplifier (2). The output of the second local oscillator (to) is supplied to the second mixer (b), and the second mixer (b) converts the first intermediate frequency to a second intermediate frequency of, for example, 10.7 MHz. Ru. The second local oscillator (to) is a fixed frequency oscillator using, for example, a crystal oscillator.

The output of the second mixer (2) is supplied to the FM demodulator Gη via the second intermediate frequency amplifier (to). FM'41 tuner (
37) is supplied to the low frequency amplifier (to), and the output of the low frequency amplifier (to) is supplied to the speaker SPK.

The first local oscillation synthesizer (4G) is configured almost the same as the transmitter synthesizer αQ described above. In other words, the output of the four reference oscillation envelopes υ using a crystal oscillator is supplied to the phase comparator (c). The output of the phase comparator (6) is supplied to a voltage controlled oscillator (VCO) (Incorporated) via a low-pass filter (43), and the oscillation output of the VCO (44) is fed to a programmable (variable) branching unit (HA). ) and is supplied to the phase comparator 021. The oscillation output of the VCO ■ is supplied to the first mixer 02.

5 shows the reception channel setting unit as a whole, and the microprocessor (CPU) t5U reads out the table of division ratios of the divider Ω4 for each channel stored in the ROM 5a in accordance with the channel designation by the channel selection switch ■. The control data is supplied as a frequency divider. This control data presets the counter (not shown) of the frequency divider (c), and
The division ratio of is set to a predetermined value NR. In this case, for the same channel, if the oscillation frequencies of the synthesizers αQ and Vcoa and (C) on the transmitting side and receiving side are respectively fs and fl, then the difference between them is the first intermediate frequency of the receiver. equal to the frequency fi, i.e. l fs - fl
I = fm holds true.

In addition, since both the transmitter and the receiver correspond to channels with the same spacing, the frequencies of the two synthesizers (10 and Tochi's reference oscillators Qυ and (4U) are set equal to the channel spacing. Therefore, the frequencies of the two synthesizers αQ and (4U) are set equal to the channel spacing. 40 VCOC141 and G141 oscillation frequencies fs and f!
! In particular, the relationship f S/NT = fl/NB is established between the division ratios NT and NR of the frequency dividers α3 and α4.

The reception channel number set by the selection switch is displayed on the liquid crystal display (b).

D Problems that the invention aims to solve By the way, for example, in the United States, VHF television channels from channel 7 to channel 13 (174MHz to
An empty channel of 216 MHz) has been assigned as a frequency band for use in a wireless microphone system. Each television (TV) channel from Channel 7 to Channel 13 is further divided into channels for wireless microphones at intervals of 200 KHz, and 24 wireless microphone channels are allocated within one TV channel. Therefore, a total of 168 wireless microphone channels are allocated between television channels 7 and 13. In addition, since TV channels are assigned every other channel to one region, in one region, the only empty TV channels are odd-numbered channels or only even-numbered channels. To select one channel from among channels, follow the steps below. On the sending and receiving sides,
Channel selection switch (C), the TV channel switch (not shown) of 153+ is used to first select the same one empty TV channel, and then the channel selection switch (also not shown) is used to select 24 of the empty TV channels. Select the same one of the channels for your wireless microphone. Then, both the transmitter and receiver are operated to check the reception status, especially whether there is any interference due to external radio waves or noise. If you check the reception status and find that the channel you want to use is being interfered with by external radio waves or noise, change the channel each time using the same procedure as above to avoid interference. That's what I do. However, in order to avoid the above-mentioned interference, it is necessary to change the channels of the transmitter and receiver more than once while aligning them, which is actually a rather troublesome task.

In addition, the transmitter of the wireless microphone is required to be particularly small, and the above-mentioned TV channel switch and favorite channel switch (both made by rotary) are required.
There were five problems in that it was difficult to accurately match the transmitter channel to the receiver channel because the transmitter itself and the channel display part were small and the intervals between the display scales were small. The above-mentioned channel setting problem becomes a particularly serious problem when multiple wireless microphones are used for multiple channels.

This means that when using multiple channels, as mentioned above, even if 36 or 48 channels are allocated to one area, the related channels that are subject to 3rd-order intermodulation interference, for example, will be substantially K.

This is because it becomes unusable. The applicant filed a patent application in 1983-
As already disclosed in No. 134,498, among the 24 wireless microphone channels/channels assigned to one TV channel, for example, a combination of 6 channels can be used simultaneously without mutual interference. . Since special conditions are added to this combination, it is difficult to select which combination is an appropriate combination. If this selection is not made properly, even wireless microphone systems that can cover a large number of channels will not be able to use multiple microphones at the same time due to mutual interference.

Furthermore, equipping each of the transmitter and receiver with a channel setting mechanism as described above, as well as a microprocessor, poses a problem in that it impedes cost reduction and, in particular, miniaturization of the transmitter. Ta.

When reducing the size of the transmitter by removing the channel setting mechanism, microprocessor, etc., it is conceivable to control the variable branching unit of one synthesizer using external data as shown in FIG. In this Figure 6, (15P
) is a parallel data input type variable divider, to which parallel data for setting the division ratio is supplied from the control data input terminal (b). The output of the VCOI 141 is mixed with the output of the local oscillator in a mixer Qll, and the difference frequency fd between the two is
(for example, 20 MHz) and is supplied to the parallel variable divider (15F), where it is divided at a division ratio nt smaller than the division ratio NT of the variable frequency divider α9 in Fig. 4. The remaining configuration is the synthesizer αO shown in FIG. 4 above.
It is similar to

The variable branching unit (15P) with parallel data input has a low upper limit of input frequency and does not operate with the signal of the wireless microphone channel in the 200 MH2 band, so the input frequency must be lowered as described above. For this reason, there are problems in that the circuit becomes complicated and mechanical and circuit measures are required to prevent the generation of spurious components due to the use of the mixer.

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

E. Means for Solving the Problems The present invention provides a synthesizer type transmitter (in a wireless communication device consisting of an M device and a receiver, channel setting means including a microprocessor is provided in either the transmitter or the receiver, This wireless communication device uses this channel setting means to set the channels of each synthesizer of the transmitter and receiver.

F Effect: According to this configuration, the transmitter and receiver can be easily and reliably set to the same channel, the cost of the system is reduced, and the other device, which does not require a channel setting means, is miniaturized.

G Embodiment G1 An Embodiment Hereinafter, an embodiment of a wireless communication device according to the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, parts corresponding to those in FIGS. 4 and 5 are designated by the same reference numerals, and redundant explanation will be omitted.

In Fig. 1, TX indicates the transmitter as a whole, and the transmitter TX is composed of a synthesizer α, a high-frequency power amplifier 4, and an audio amplifier α, and the variable division divider a9 of the synthesizer 0Q has control data input. Terminal (c) is connected.The transmitter of this embodiment does not have a transmission channel setting section like the conventional transmitter shown in FIG. 4.R
X indicates the main receiver as a whole, including a synthesizer (40) as a first local oscillator and a channel setting means (50M).
and has. This parent receiver RX is the same as the receiver in Fig. 5 (
The configuration is similar, and for the sake of simplicity, illustration of the second mixer (b) to the speaker SP is omitted in FIG. The control data output terminal (G) connected to the CPU Elυ of the main receiver RX and the control data input terminal (C) of the transmitter TX are connected by a cable trowel.
From 5υ, the clock and serial data for control are sent to the transmitter TX.
A variable portion of the amount is supplied to the JIiJ equipment.

Next, with reference to the chart 70 of the channel setting section (50M) in FIG. 2, the operation during channel setting of this embodiment will be explained.

When a channel for one wireless microphone in one TV channel is specified by the channel selection switch Q of the receiver RX, the CPU El) reads the data of this channel selection switch Q (step ■) and selects the specified channel. The channel data corresponding to is read from the ROM (52M) (step ■). From this read channel data, the CPU 61 calculates the frequency division ratio NR of the variable frequency division 4 of the receiver (2) (step (2)), and the serial control data is supplied to set the variable division 4 (step ■). Next, the frequency division ratio NT of the variable divider α4 of the transmitter TX corresponding to the designated channel is determined by the CPU 5 from the channel data read out in step (2).
1: Calculated in (step ■), through the cable state,
The serial control data is supplied to the variable frequency divider a9 of the transmitter TX, and the frequency divider α9 is set (step 2).

Thus, each frequency divider αω of both synthesizers αQ and αO
When the power is turned on or when the channel is changed, the frequency division ratios of the transmitter TX and the transmitter RX are set to predetermined values NT and NR, respectively, and the transmitter TX and the transmitter RX are set to the same channel for the wireless microphone.

In this way, if the wireless microphone system for which channel ≠ is set is subject to interference from external radio waves or noise, the main receiver RX and the transmitter can be switched to the main receiver RX and You can avoid interference by resetting the TX channel at the same time.

In order to reliably set the channel of the transmitter TX, it is preferable that the power on/off state of the transmitter TX is displayed on the display device 5 of the main receiver RX via a cable flash.

According to this embodiment, the channel setting section (5
0M) is the variable divider (
In addition to setting the division ratio NR of (c), the division ratio NT of the transmitter TX synthesizer (variable divider a9 of 11) is also set via the cable (g). The a!RX channel setting can be easily and reliably performed.Furthermore, since the channel setting means of the transmitter TX is not required, the transmitter TX can be made smaller and its cost can be reduced. can be reduced.

The present invention has been described above with respect to the case where a single wireless microphone is used, but at the production site of a television program, etc., communication between the director and operators of various devices such as cameras, lighting, audio, etc. (so-called intercom) Even in the case of using one wireless channel, the transmitter for each operator's response is configured in the same way as the transmitter TX in Figure 1, and the control data from the machine is input to the control data input terminal of each transmitter. By supplying the transmitter in common, it is possible to easily and reliably set channels for a plurality of transmitters in the same way as described above.

G2 Another Embodiment Next, with reference to FIG. 3, another embodiment of the invention suitable for use with multiple channels will be described. The configuration of the main part of another embodiment of the present invention is shown in the third factor. In this Fig. 3, TXA, TXB and TXC each represent a transmitter (wireless microphone) as a whole, and R
XA indicates the parent receiver as a whole, and RXB and RXC each indicate the child receivers as a whole. 3 transmitters TX
A, TXB, and TXC each use different channels A, B, and C for wireless microphones, and are configured exactly the same as the transmitter TX shown in FIG. 1 above. Corresponding parts are given the same reference numerals with suffixes A, B, and C representing channels, respectively, and redundant explanation will be omitted. The parent receiver RXA has exactly the same configuration as the parent receiver RX shown in Figure 1, and the two child receivers RXB and RXC have the channel setting section (,50M) removed from the parent receiver RX in Figure 1. The receivers RXA and RXA are configured to receive radio waves transmitted from the transmitters TXA, TXB, and TXC, respectively.
, RXB and RXC that correspond to those in FIG. 1 are designated by the same reference numerals with suffixes B and C, respectively, and redundant explanation will be omitted. In addition, in this FIG. 3, each synthesizer (10A) z (IOB) j (IOC
) j (40A), (40B), (40C)
Some of them are omitted.

Control data output terminal (to) of channel setting section (50M) of main receiver RXA and each control data input of each synthesizer (IOA), (IOB) and (IOC) of three transmitters TXA, TXB and TXC Terminal (25A),
(25B) and (25C) are connected by a cable. On the other hand, control data input terminals (57B) and (57C) are connected to the variable branching units (45B) and (45C) of the synthesizers (40B) and (40C) of the two slave receivers RXB and RXC, respectively. , these control data input terminals (57B) and (57C) are also connected to the cable (
channel setting section (5) of the main receiver RXA.
0M) is connected to the control data output terminal -.

The operation of this embodiment is as follows.

As disclosed in the aforementioned Japanese Patent Application No. 59-134,498, there are certain combinations of channels that do not experience mutual interference when using multiple (1')'7 earless microphones simultaneously. That is, when six or less wireless microphones are used at the same time, three groups are set, with six specific channels for wireless microphones being one group for each TV channel. Also,
If 7 or more microphones are used simultaneously, T
In areas where V-channels have an odd number of free channels, a total of 13 channels are available across each TV channel, and in areas with an even number of channels, a total of 11 channels are available across each TV channel.

ROM of channel setting section (50M) of main receiver RXA
(52M) stores channel data of a specific combination as described above. In this embodiment, three transmitters TXA, TXB, and TXC are used simultaneously, and when one TV channel and the required number of channels are instructed to the CPU 5υ by the channel selection switch 531, one of the TV channels is Channels A, B and C for three wireless microphones from one group
channel data is read from the ROM (52M). In the same manner as in the above-mentioned embodiment, the CPU 15υ calculates the division ratio NRA of the variable division divider (45A) of the main receiver RXA from the read A channel data, and supplies the serial control data. , variable branching unit (45
A) is set.

Next, from the read A channel data, the first
Frequency division ratio NTA of the variable divider (15A) of the transmitter TXA
is calculated by the CPU 5υ, serial control data is supplied, and the variable branching unit (15A) is set. Furthermore, from the read data of channels B and C, each variable branching unit (45B
) and (45C) and l'c (15B) and (15C
) of each frequency division ratio NRB and NRC and K NTB and NT
C is calculated by CPU6υ, and each variable branching unit (45B
), (45C).

(15B) and (15C) are set respectively.

In this case, each transmitter and receiver and corresponding control data are assigned appropriate addresses.

In this way, if the wireless microphone system set for one group within one TV channel is interfered with by external radio waves or noise, you can use the same procedure as described above to operate the selection switch on the main receiver RXA once. , the main receiver RXA, the three transmitters TXA, TXB and TXC, and the two slave receivers RXB and RXC are reconfigured for each channel group, and Ic is reconfigured for the TV channel to eliminate interference. can be avoided.

In the case of this embodiment, the parent and child receivers RXA.

RXB and RXC are installed together in one rack, and accommodation panels that accommodate multiple transmitters TXA, TXB and TXC are installed in the same rack, and the main receiver RX
If you connect A and Heiko receivers RXB and RXC with a cable and also wire the connection cable (G) to the housing panel, when each transmitter is housed in this housing panel, the main receiver Connection with machine RXA is completed. In addition, a secondary battery is used as a power source for each transmitter, and a charging device is provided in the housing panel, so that when each transmitter is housed in the housing panel, the secondary battery of each transmitter is charged. Then, each transmitter can be reliably set in a channel setting state, and can be handled more conveniently as a wireless microphone system.

According to this embodiment, the channel setting unit (50M) K of the parent receiver RXA includes the parent receiver RXA itself, the plurality of child receivers RXB, RXC, and the plurality of transmitters TXA,
TXB.

Adjust the TXC channel settings so that mutual interference does not occur5.
This can be done easily and reliably.

Further, since it is only necessary to provide the channel setting section (5) in the main receiver RXA, the transmitter can be downsized and the cost of the system can be further reduced.

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

Furthermore, although the modulation type is frequency modulation in the above-described embodiments, phase modulation may be used, and amplitude modulation may also be used depending on the application.

H Effects of the Invention As detailed above, according to the present invention, a channel setting means is provided with one of the synthesizer type transmitter and the receiver as a base unit, and this channel setting means can
Since the channel of the synthesizer of the other handset is also set, it is possible to easily and reliably set the channel, and to obtain a wireless communication device that can downsize the handset and reduce its cost. .

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of an embodiment of a wireless communication device according to the present invention, FIG. 2 is a 70-chart for explaining the operation of an embodiment of the present invention, and FIG. FIGS. 4 and 5 are block diagrams showing configuration examples of a conventional transmitter and receiver,
FIG. 6 is a block diagram showing another example of the configuration of a conventional transmitter. (101, Cl0A), (IOB), (IOC)j#
(40A), (40B). (40C) is a synthesizer, (50M) is a channel setting means, 51J is a microprocessor, TX, TX
A, TXB. TXC transmitter, RX, RXA, RXB,
The RXC is a receiver.

Claims (1)

[Scope of Claims] A wireless communication device comprising a synthesizer type transmitter and a receiver, wherein either one of the transmitter and the receiver is provided with channel setting means including a microprocessor, and the channel setting means allows the transmitter to and a wireless communication device characterized in that a channel of each synthesizer of the receiver is set.