JPH01238233A - Transmitting and receiving frequency setting method for radio transmitter-receiver - Google Patents

Abstract

PURPOSE:To set a prescribed frequency with a simple operation by the use of a small capacity memory by scanning a receiving frequency, discriminating it, storing this frequency information, and setting the frequency of a receiver based on the storage. CONSTITUTION:A transmitting frequency signal from a radio transmitter-receiver 1 is received in a radio transmitter-receiver 3, the frequency information is scanned and discriminated in a frequency discriminating circuit 6 and stored in a memory 7 through a CPU 8. Based on this stored content, the frequency of the receiving part 5 is set by a setting means 9 through a CPU 8. Thereby, all the frequency is stored and the receiving frequency is set with the simple operation by the use of the small capacity memory without executing a complicate switch operation.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of setting transmission and reception frequencies in a wireless transceiver, and more specifically, to a method for setting transmission and reception frequencies in a wireless transceiver in which an oscillation/local oscillation synthesizer is controlled by a microcomputer. Regarding frequency setting method.

[Conventional technology]

In order to transmit and receive data between wireless transmitters and receivers, the transmitting and receiving frequencies must be set in advance between the two. If the capacity of the transceiver is small, the local oscillator is equipped with crystal oscillators corresponding to the number of channels, but as the capacity of the transceiver increases, the number of crystal oscillators must be increased accordingly. Therefore, in recent years, PLL (PLL), which is a feedback loop consisting of internal components such as a phase comparator, a low-pass filter, an error signal amplifier, a voltage-controlled oscillator, a frequency divider that divides the reference frequency, and a generation circuit that generates a frequency division ratio, has been developed. ) A wireless transceiver has been proposed in which a synthesizer (needs-locked loop) is controlled by a central processing unit (CPU) composed of a microcomputer or the like. To set the transmitting/receiving frequency in such a wireless transmitter/receiver, you can store the frequency data in advance in memory and call up and set the frequency to be used using a switch, or you can write the frequency for each channel to be used in memory and set it. There is a way to determine the frequency to be used in the settings.

[Problem to be solved by the invention]

However, in the former case, a memory with a large capacity must be used in order to store all frequencies, and furthermore, in order to select any one of those frequencies, it is necessary to use a memory with a large capacity that corresponds to the number of set frequencies. It is necessary to provide a switch or a switch means in combination with an appropriate switching means, which makes the structure complicated. In the latter case, it is necessary to set the frequency for each channel, that is, to write it into the memory, which has the disadvantage that there is a high possibility that a writing error will occur and that it takes too much time and effort to set it.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method for setting a transmission/reception frequency for a wireless transceiver, which allows setting a predetermined frequency by a simple operation.

[Means to solve the problem]

The transmitting/receiving frequency setting method of the present invention includes controlling an oscillation/local oscillation synthesizer by a central processing means and forming a signal of a frequency to be set by a signal generating means in a wireless transmitter/receiver having a frequency scanning section in the receiving section. , this signal is received by the receiving section, the frequency of the signal is determined by the frequency scanning section, and the frequency data is stored in the storage means, and the central processing means sets the transmission and reception frequency based on the frequency data in the storage means. It is characterized by:

〔Example〕

Hereinafter, an embodiment of the present invention shown in the drawings will be described. Reference numeral 1 denotes a radio transceiver that transmits a signal with a frequency of a signal to be set, and this signal is sent from an antenna 2 to a radio transceiver 3 that sets the frequency. Sent. The wireless transmitter/receiver 3 includes a receiving section 5 having a PLL circuit that receives the signal from the wireless transmitter/receiver 1 via the antenna 4, a frequency determining circuit 6 that determines the frequency of the received signal, and stores determined frequency data. and a CPU 8 for transmitting/receiving the receiving section 5 and setting the receiving section 5 to the frequency value stored in the memory 7. When the receiving section 5 enters the receiving state, the receiving section 5 sequentially reads the frequency division ratios stored in advance in the memory of the CPU 8 via the CPU 8, and changes the frequency division ratio with respect to the reference frequency of the PLL circuit of the receiving section 5, thereby generating local oscillation. The receiving frequency value is determined by scanning the receiving frequency while changing the frequency sequentially. The frequency discrimination circuit 6 may receive this frequency data.

A setting means 9 composed of a switch or the like for storing the determined frequency data in the memory 7 is connected between the frequency determining circuit 6 and the memory 7.

Therefore, in order to set the frequency to be transmitted, first, the radio transceiver 1 transmits a signal of that frequency from the antenna 2 to the radio transceiver 2 of the other party. Wireless transceiver 2
Then, this signal is scanned and received by the frequency scanning section of the receiving section 5, and its frequency value is discriminated by the frequency discriminating circuit 6.

When adjusting the frequency of the receiving section 5 to this frequency value, the setting means 9 is operated to write this frequency data into the memory 7. The CPU 8 retrieves this frequency data from the memory 7 and sets the frequency of the receiving section 5.

In the above-mentioned embodiment, the signal of the frequency to be set is transmitted from one of the wireless transceivers, but in order to generate an arbitrary frequency signal to the wireless transceiver, the generator is connected by wire. Add the signal from this signal generator to the radio transceiver via an attenuator.

The frequency may also be set.

〔Effect of the invention〕

As described above, the method for setting the transmitting and receiving frequency of a wireless transmitter/receiver according to the present invention receives a signal of the frequency to be set, stores the frequency data, and sets the frequency of the wireless transmitter/receiver accordingly. Even if there are a large number of set frequencies, there is no need to store all of the data, so a small memory capacity is required, and complicated switch operations are not required. Furthermore, since the information is automatically written to the memory, writing errors can be prevented.

[Brief explanation of the drawing]

FIG. 1 is a block diagram schematically showing an embodiment of the present invention. In the drawing, 1 and 3 are wireless transceivers, 2 and 4 are antennas, 5 is a receiver, 6 is a frequency discrimination circuit, 7 is a memory, and 8
is a CPU, and 9 is a setting means. Patent Applicant Fujitsu General Co., Ltd. Agent Patent Attorney Takuya Ohara No. 1rXJ L 1

Claims (3)

[Claims] (1) In a wireless transmitter/receiver in which an oscillation/local oscillation synthesizer is controlled by a central processing means and a receiving section has a frequency scanning section, a signal having a frequency to be set is formed by a signal generating means, and this signal is transmitted to the receiving section. the frequency scanning unit determines the frequency of the signal, stores the frequency data in a storage means, and the central processing means sets a transmission/reception frequency based on the frequency data in the storage means. Features: How to set the transmitting and receiving frequency of a wireless transmitter/receiver. (2) The method for setting a transmission/reception frequency for a wireless transceiver according to claim 1, wherein the signal from the signal generating means is wirelessly transmitted by the wireless transceiver. (3) The method for setting the transmitting and receiving frequency of a wireless transmitter/receiver according to claim 1, wherein the signal from the signal generating means is sent to the wireless transmitter/receiver by wire via an attenuation means.