JP2552744Y2 - Communication equipment - Google Patents

Description

[Detailed description of the invention] [Industrial applications]

The present invention relates to SSB, CW and A in the field of wireless communication.
A communication device operated in a plurality of modes such as M, and corresponding to each mode, a wideband pass characteristic (hereinafter simply referred to as “IF filter”) of various demodulation circuits and intermediate frequency filters (hereinafter simply referred to as “IF filters”). The present invention relates to a communication device capable of switching and selecting a wide-band characteristic or a narrow-band-pass characteristic (hereinafter, simply referred to as a "narrow characteristic").

[Prior art]

In a communication device including a plurality of modes and a plurality of IF filters having different bandpass characteristics used in the respective modes, the IF filters are usually manually switched every time the mode is switched. Conventionally, the filter is switched by a switch together with the mode switching.For example, even if a narrow IF filter is always used for the CW mode, when the CW mode is selected by switching the mode, the standard Since the filter is switched only to the filter having the set normal characteristic, the filter having the narrow characteristic must be selected every time thereafter. As described above, in a communication device in which an IF filter must be selected every time the mode is switched, there is a problem that useless operation is added and efficient operation of the communication device cannot be performed.

[Problem to be solved]

Therefore, some techniques have been proposed for automatically changing the characteristics of an IF filter in response to a change in a reception frequency. For example, Japanese Patent Application Laid-Open No. 54-127611 discloses that a line including a booster, a line including an attenuator, a line including a narrow band filter, and the like are selected according to the state of a detection output signal in a receiving apparatus, and a signal is selected. Is disclosed. However, since there is only one kind of filter characteristics, it cannot be applied to the purpose as in the present application. Also, the switching is not performed according to the reception mode. Further, since there is no means for displaying the current selection state, there is a possibility of erroneous operation. Japanese Utility Model Application No. 60-155540 discloses an AM / FM receiver having a band memory for storing a wide band or a narrow band for each station of a communication partner and an operation key for changing the band memory. However, since the band stored in the band memory is fixed so that a wide band is set in an initial state, there is a problem that the initial state cannot be set to a desired content. Furthermore, since there is no means for displaying the current state, there is a possibility of erroneous operation. Japanese Patent Application Laid-Open No. 54-125911 discloses a receiver configured to store bandwidth information and radio wave format information in a random access memory along with frequency information. There is a problem that information is lost. Furthermore, since there is no means for displaying the current state, there is a possibility of erroneous operation. Therefore, the present invention has been made to provide a communication device provided with a unit capable of changing an IF filter to be selected each time the mode is changed and preventing erroneous operation.

[Means for Solving the Problems]

In order to solve the above problems, the communication device according to the present invention includes a plurality of types of communication modes, and an IF filter that can be changed to at least two different characteristics of a wide characteristic and a narrow characteristic. Each time the IF filter has a change condition preset to one of the wide characteristic or the narrow characteristic, and according to the change of the communication mode, changes the IF filter to the characteristic set in the change condition. In the configured communication device, a first nonvolatile storage means for storing the change condition, and an IF set corresponding to each communication mode in the change condition stored in the first nonvolatile storage means. Filter presetting means for changing the characteristic of the filter to the other characteristic, and changing conditions read from the first nonvolatile storage means are stored. (2) non-volatile storage means, filter selecting means for changing the characteristic of the IF filter under the change condition stored in the second non-volatile storage means to the other characteristic, and all of the selectable IF filter characteristics. Display means for simultaneously displaying the type of the characteristic of the intermediate frequency filter selected at the same time as displaying the type list is provided.

[Action]

In the communication device according to the present invention, the characteristic of the IF filter can be changed to a predetermined characteristic based on a change condition preset for each communication mode. For example, as shown in FIG. 4, in the first nonvolatile storage means, for the communication mode [A], the characteristic of the IF filter is set to [Aα], and for the communication mode [B], In other words, the change condition (a) is stored so that the characteristics of the IF filter are set to [Bα]. When the change condition (a) is changed to the change condition (b) by the filter preset means, the characteristic of the IF filter is set to [Aβ] for the communication mode [A] in the communication device. Then, for the communication mode [B], the characteristic of the IF filter is set to [Bβ]. For example, if the communication mode [A] is the SSB communication mode, the communication mode [B] is the CW communication mode, the characteristic [α] is a wide characteristic IF filter, and the characteristic [β] is a narrow characteristic IF filter, In the case of (a), the IF filter having the normal wide characteristic is selected in the SSB communication mode, and the IF filter having the wide characteristic is selected also in the CW communication mode. When changed, the narrow IF filter is selected in the SSB communication mode, and the narrow IF filter is also selected in the CW communication mode. Note that the change condition stored in the first nonvolatile storage means does not disappear even when the power is turned off. Based on a change condition in the first nonvolatile storage means, a predetermined value is set in accordance with the switching of the communication mode of the communication device.
It is changed to the characteristics of the IF filter. Further, the change condition read out from the first nonvolatile storage means in this way is stored in the second nonvolatile storage means. The change condition stored in the second nonvolatile storage means does not disappear even when the power is turned off. Stored in the second nonvolatile storage means.
The type of characteristics of the IF filter can be changed by the filter selecting means. In this way, the change condition of the communication device can be set to a desired condition. Since all kinds of selectable IF filter characteristics and the currently selected IF filter characteristic type are simultaneously displayed on the display means, operability and visibility are excellent.

【Example】

FIG. 1 is a block diagram of a communication device according to an embodiment of the present invention, FIG. 2 is a diagram corresponding to a change condition, and FIG. It is a front view. In the drawing, 1 is a communication device, 2a, 2b, 2c, and 2d are intermediate frequency (IF) filters, 2a is an SSB wide filter with a pass bandwidth of 2.8 kHz, and 2b is an SSB narrow and CW wide with a pass bandwidth of 1.8 kHz. The filter, 2c, is a CW narrow filter having a pass bandwidth of 500 Hz, and 2d is an AM filter having a pass bandwidth of 6 kHz. Reference numeral 3 denotes a mode / filter selection circuit which outputs a mode signal and selects one of the IF filters 2a, 2b, 2c, 2d. Each filter may be an independent individual filter, but it is also possible to obtain different characteristics by switching elements added to a common circuit or changing constants. Reference numeral 4 denotes a mode / filter selection information temporary storage circuit provided with a nonvolatile memory, reference numeral 5 denotes a filter selection switch, reference numeral 6 denotes a channel memory bank, and reference numeral 7 denotes non-volatile storage of IF filter selection data selected corresponding to each communication mode. A mode / filter selection information storage circuit having a functional memory,
When the communication mode is the SSB mode, the SSB wide filter 2b is selected as the IF filter, and the communication mode is the C mode.
For W, CW wide filter 2b as IF filter
Is selected, and when the communication mode is AM, the respective selection data is initially stored so that the AM filter 2d is selected as the IF filter. Reference numeral 8 denotes a mode selection switch, which selects information of an IF filter corresponding to the selected mode from the data of the mode / filter selection information storage circuit 7, and stores the mode / filter selection information temporary storage circuit 4 and the mode / filter The selection circuit 3 selects one of the filters. Reference numeral 9 denotes a filter preset switch, which rewrites data in the mode / filter selection information storage circuit 7. 10 is a condition setting circuit. The filter selection switch 5 corresponds to a filter selection means, the filter preset switch 10 corresponds to a filter preset means, the mode / filter selection information storage circuit 7 corresponds to a first nonvolatile storage means,
The mode / filter selection information temporary storage circuit 4 corresponds to a second nonvolatile storage unit. The front panel of the communication device is provided with a CRT display device to facilitate switching between the filters 2a, 2b, 2c and 2d. That is, as shown in FIG. 3, at the bottom of the screen 11 of the CRT display device when the preset filter is switched, characters indicating the communication modes SSB, CW, and AM and types of IF filters that can be selected in each communication mode are displayed. Are displayed (in this case, two types), and a filter preset switch 9 is arranged at a corresponding position at the bottom of the screen 11. Furthermore, the letter indicating the corresponding IF filter is underlined to indicate the currently selected IF filter. Further, a filter selection switch 5 is arranged at the upper right part of the screen 11. With such a configuration, excellent operability and visibility can be obtained. In the communication device having the above-described configuration, when the change condition set in the mode / filter selection information storage circuit 7 is the change condition (a) shown in FIG. 3, the communication mode is set to the SSB communication mode. Based on the selection data in the mode / filter selection information storage circuit 7, the wide filter 2a is selected as the IF filter, and if the communication mode is CW, the CW wide filter 2b is selected as the IF filter. Then, by the filter preset switch 9,
When the communication mode is changed to the SSB communication mode after changing the change condition data written in the mode / filter selection information storage circuit 7 to the change condition (b), the SSB narrow filter 2b is selected as an IF filter, When the communication mode is CW, the CW narrow filter 2c is selected as the IF filter. Since the mode / filter selection information storage circuit 7 includes a non-volatile memory, the change condition is retained even when the power is turned off. By the way, in this embodiment, the switches for determining the filter to be used include the filter selection switch 5 and the filter preset switch 9. In this embodiment, when the mode is changed, the filter set by the filter preset switch 9 is set. When the filter is temporarily changed from the set filter, the contents of the mode / filter selection information temporary storage circuit 4 are rewritten by the filter selection switch 5. Since the mode / filter selection information temporary storage circuit 4 includes a nonvolatile memory, the filter selection switch 5
Is retained even when the power is turned off. For example, immediately after switching the mode, a filter is set by the filter selection switch 5, and after the power is turned off,
When the power is turned on, the filter set by the filter setting switch 5 is set. At the time of memory scanning, the filter is also set by the data stored in the channel memory bank 6. As described above, according to the communication device of the present invention, the change condition can be changed at any time, and once set, the change condition is retained even when the power is turned off. By returning to the change condition, the change condition can be temporarily changed. In this way, every time the mode is changed, the IF filter characteristic is changed based on the change condition, so that no particular operation is required, and it is possible to set the IF filter according to the operator's preference. Further, on screen 11, all types of selectable IF filters are displayed, and characters of the currently selected IF filter type are underlined, so that excellent operability and visibility are obtained, and IF An erroneous operation in a filter selection operation can be prevented. Naturally, it is possible to diversify the communication device by setting conditions for changing various circuit characteristics such as a demodulation circuit as well as the IF filter.

[Effect of the invention]

Thus, according to the communication device according to the present invention, according to the communication mode, the characteristics of the IF filter are predetermined characteristics based on a preset change condition, that is, either the wide characteristics or the narrow characteristics. However, since it is provided with filter preset means for arbitrarily changing the change condition and filter selection means, various IF filter characteristics according to the operator's request are preferentially selected. Condition can be set. However, the set change conditions are retained even if the power is turned off once, and there is no need to reset them the next time they are used, so it is as if a communication device was manufactured individually according to the operator's preference. Since it can be used with a simple feeling, it is possible to provide a communication device in an extremely state. Further, the display means simultaneously displays all types of selectable IF filter characteristics and the current type of IF filter characteristics, so that excellent operability and visibility can be obtained, and IF filter selection operation can be performed. Erroneous operation can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a communication device according to the present invention, FIG. 2 is a diagram showing a change condition correspondence in the communication device, and FIG. 3 is a screen of a CRT display device of the communication device and a panel surface around the same. FIG. 4 is a diagram corresponding to a change condition when a plurality of channels are scanned in the communication device. 1: Communication device, 2a, 2b, 2d, 2d: IF filter, 3: Mode /
Filter selection circuit, 4 mode / filter selection information temporary storage circuit (second nonvolatile storage means), 5 filter selection switch (filter selection means), 6 channel memory bank, 7 mode / filter selection information storage circuit (First nonvolatile storage means), 8... Mode selection switch, 9
... Filter preset switch (filter preset means), 10 ... condition setting circuit, 11 ... screen (display means).

Claims (1)

(57) [Scope of request for utility model registration] 1. A communication system comprising: a plurality of communication modes; and an intermediate frequency filter that can be changed to at least two different characteristics of a wide band pass characteristic and a narrow band pass characteristic. A pass condition or a narrow band pass characteristic is provided with a change condition set in advance, and according to a change in the communication mode, the intermediate frequency filter is changed to the characteristic set in the change condition. In the communication device, a first non-volatile storage means for storing the change condition, and an intermediate frequency filter set corresponding to each communication mode in the change condition stored in the first non-volatile storage means Filter preset means for changing the characteristic to the other characteristic, and a change condition read from the first nonvolatile storage means are stored. Second non-volatile storage means, a filter selection means for changing the characteristic of the intermediate frequency filter under the change condition stored in the second non-volatile storage means to the other characteristic, and a selectable intermediate frequency filter Display means for simultaneously displaying a list of all types of characteristics and a type of characteristics of the intermediate frequency filter currently selected.