JPS6253579A - Portable receiver - Google Patents

Abstract

PURPOSE:To clear the discrimination of a frequency band in selection with only watching the picture plane of a liquid crystal image display element by displaying information that represents the range of the frequency and the indication of a receiving frequency selectively and for a regulated time on the picture plane of the liquid crystal image display element. CONSTITUTION:By selecting FM, for example, S2 of a frequency band change- over switch, an input/detection/amplifier circuit system corresponding to FM is selected at a receiving circuit 2. At a channel selection circuit 3, a circuit system that generates a tuning voltage which controls the frequency range of an input circuit for FM selected at the receiving circuit 2, and the frequency selected is raised or lowered according to the raising/lowering of the tuning voltage. At a storage circuit 4, the information of a scale that represents the frequency range for FM is selected and its content is transmitted to a display control circuit 5, being inputted to a liquid crystal display element 6, and the scale of the frequency being displayed on the picture plane. When a requested frequency is found and the tuning voltage is not more changed, a selection display is disappeared after a prescribed time by a timer function in the display control circuit 5.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a channel selection display method for portable receiving equipment.

[Summary of the invention]

The present invention provides a portable receiving device capable of receiving radio waves in a plurality of frequency bands including TV broadcast radio waves, including a storage means for storing information indicating each frequency range of the plurality of receivable frequency bands, and a storage means for storing information indicating each frequency range, and said frequency range. and display control means for selectively displaying information indicating the desired frequency on the screen of the liquid crystal image display means and indicating the receiving frequency, and when selecting a desired frequency, indicating the frequency band that includes the frequency. By displaying only the information for a certain period of time on the screen of the liquid crystal image display means and also indicating the currently received frequency on the screen, mechanical and design constraints in the channel selection display method are significantly reduced. This enables a channel selection display with good visibility and operability.

[Prior art]

Conventionally, multiple frequency bands (for example, AM
The channel selection display method of portable receiving equipment that receives radio waves in the Broadcasting System, FM broadcast band, shortwave broadcast band, etc. is generally shown in Figure 2 (
As shown in a) and (b).

That is, (a) is TV, ? A portable receiving device capable of receiving M and AM signals, and a plurality of frequency display scales 8 are arranged at appropriate locations on the surface of the case body 7 of the device for each receivable frequency band, and reception frequencies are indicated close to the scales 8. The pointer 9 is arranged,
The pointer moves within the range of the frequency display scale 8 in conjunction with the tuning knob 10. The tuning knob 10 (with a suitable mechanical structure) slides a variable resistor or variable capacitor t inside the display unit to change the voltage or capacitance required by the receiving circuit to select the desired frequency.

(b) has the same reception [[1-] as in (a), but the relationship between the frequency display scale and the pointer is reversed compared to (a), i.e. on the cylindrical body 12 that rotates in conjunction with the tuning knob 11. A plurality of frequency display scales 15 are arranged for each frequency band, and the scale itself is moved by t to select a desired frequency in accordance with a pointer fixed to the case body or the like.

The relationship between the channel selection knob and the receiving circuit is as shown in (a).

[Problems and objects to be solved by the invention] However, in the above-mentioned prior art, firstly, the frequency display scale (hereinafter referred to as "scale") becomes complicated. For devices that can receive , the scale is TV-VBF,
TV-U) IF.

Four types of FM and AM are required, and it is either a 5-row configuration including the pointer as in the second (a), or a 4-row configuration on a cylindrical body as in b"l, which makes it visually appealing. It is complicated, and if there is no means to indicate the currently selected frequency band other than the frequency band changeover switch 14, it is impossible to determine which frequency band is selected just by looking at the pointer, so the frequency band is changed each time. The complexity of having to check the band changeover switch 14 is added.

Second, among portable receiving devices, TV and FM.

Items with high characteristics as information devices that can receive broadcast bands such as AM are required to be light, thin, and small, and it is becoming common practice for such small devices to be at least small enough to fit in a chest pocket. Placing five or four rows of scales as described above on the case body imposes large space and design constraints.

Thirdly, the mechanical structure related to the channel selection display becomes an obstacle in promoting the above-mentioned @baku-short-small ratio. That is, in the type shown in FIG. 2(a), the pointer ? A rocky shore to move! 8 (e.g. threading type, belt type, etc.)
, (b), the cylindrical body 12 displaying the frequency value in conjunction with the tuning knob 11 and its surrounding mechanisms become a big obstacle in terms of space.

As mentioned above, the prior art has various problems1, and the present invention is intended to solve these problems.The purpose of the present invention is to improve the visibility and operation of portable receiving equipment. The purpose of the present invention is to provide a channel selection display method that has excellent performance and that greatly reduces mechanical and design constraints in efforts to make devices lighter, thinner, and smaller.

[Means to resolve the crossroads]

The uninvented portable receiver 1g device includes a receiving means for receiving radio waves in a plurality of frequency bands including ALTV broadcast radio waves; b) a liquid crystal image display means for displaying various images including TV images; and C) a liquid crystal display means for displaying various images including TV images. storage means for storing information indicating receivable frequency ranges for each band; d) selectively displaying information indicating the frequency ranges stored in the storage means on the screen of the liquid crystal image display means for a certain period of time; and a display control means e for instructing the receiving frequency] The present invention is characterized in that it is equipped with a complete set of frequency band changeover switches for switching a selection signal that determines which frequency band fc is selected from among a plurality of receivable frequency bands.

[Operation] According to the Qg configuration of the present invention, by selecting the desired frequency a with the tin frequency odd changeover switch, the corresponding information is selected from among the information indicating the receivable range stored in the storage means, The content of the information is displayed on the screen of the liquid crystal image display means by 1#1'@ of the display control means, and the receiving means is also selected to be able to receive the desired frequency band. Next, when the receiving means selects the broadcast content, that is, selects the desired frequency using the accompanying channel selection means, the display +11J is displayed based on the frequency selection state of the receiving means.
The movement of the control means indicates the currently selected frequency with respect to the frequency information displayed on the liquid crystal image display means. In particular, when receiving radio waves containing video information such as TV broadcast radio waves, the frequency f4 information and the frequency instruction are superimposed on the video signal and displayed in combination on the screen of the liquid crystal display means for a certain period of time. After the desired frequency has been selected, the displayed content is maintained for a certain period of time and then disappears due to the action of one means on the display side. Thereafter, the information indicating the frequency range and the frequency can be displayed again by changing the frequency range switch, changing the receiving frequency by using the channel selection means attached to the receiving means, or turning on the 4-station status call switch. Instructions will appear on the screen of the liquid crystal image display means.

[Implementation row]

Hereinafter, the present invention will be described in detail based on examples.

FIG. 1 is a block diagram of a portable receiving device in one embodiment of the present invention. 1 is the receiving means block, 2 is the VH
F'-TV, UEF-TV, FM.

A receiving circuit capable of receiving each IM radio wave, 5 a tuning circuit for changing the receiving frequency of the receiving circuit 2 to select a desired frequency, 4 a VHF-TV, UH
A storage circuit that stores scales indicating the receivable frequencies or channel ranges of F-TV, FM, and AM radio waves, and 5 indicates a video signal transmitted from the receiving circuit 2 when receiving vHF or UHF-TV.1 The Vl (F or scale information indicating the UHF-TV channel range) transmitted from the memory circuit 4 is displayed on the liquid crystal image display means, and when receiving FM or AM, the FM or AM transmitted from the memory circuit 4 is displayed. 6 is a display control circuit for displaying information on a scale indicating the receivable frequency range a on a liquid crystal image display means; 6 is a liquid crystal image display element Sl, S having at least tens of thousands of pixels and capable of displaying TV images;

. . . 13n is a frequency band changeover switch that switches a selection signal that determines which frequency band to select from among a plurality of receivable frequency bands.
TV, 01 (F-TV, FM, AM and four frequency bands can be received, so n=a-4 in Sn.S
n+ is the selection) Kinuta state call switch.

The operation of the portable receiving device of this embodiment configured as described above will be explained below.

No trench, frequency band selection switch all FM (for example S,)
When this is selected, first, in the receiving circuit 2, an input/detection/amplification circuit system corresponding to FM is selected by the selection signal, and the demodulated audio signal is input to a speaker or earphone.

Second, the channel selection circuit 5 selects the F selected by the receiving circuit 2.
Frequency range of input circuit for M (?1 For example, 76~ in Japan
A circuit system that generates the sub-voltage that controls the tuning voltage (90 MHz'Hz) is selected, and as the tuning voltage goes up and down, the selected frequency also goes up and down. Thirdly, in the memory circuit 4, information on the scale indicating the frequency range for FM is selected, and its contents are transmitted to the display control circuit 5. The transmitted information is converted by the display control circuit 5 into a signal suitable for fully driving the liquid crystal, and is input to the liquid crystal image display element 6, where an FM frequency scale is displayed on the screen. On the other hand, the tuning voltage generated in the channel selection circuit 5 is input to the reception circuit 2 and used for selecting a desired frequency, and is also input to the display control circuit 5 where it is converted into a reception frequency instruction signal and displayed on the liquid crystal image display element 6. , and indicates by symbolic representation the frequency selected for the frequency scale on both sides.

The display of the frequency scale and frequency indication continues to be displayed while searching for the desired frequency, that is, while the tuning voltage is changing, and when the desired frequency is found and the tuning voltage stops changing, the display control circuit 5 The timer function inside turns off the channel selection display after a certain period of time (for example, 5 seconds) to save power consumption.After that, if you want to check the selected frequency, press the channel selection status call switch S attached to the display control circuit.
n+, all you have to do is turn it on. After confirmation, the channel selection display will disappear after a certain period of time.

Next, after listening to the 7M broadcast, turn the frequency band selector switch to V) IF.
- If TVCI'll be SS), the receiving circuit 2
The selection signal selects the input/detection/amplification circuit system compatible with V) IF-TV, and the demodulated video signal output is input to the display control circuit 5, where it is converted into a signal suitable for driving the liquid crystal and displayed as a liquid crystal image. The image is displayed on the element 6 as a TV image. FM selection selection color In the same manner as below, based on the tuning voltage generated in the tuning circuit 5 and the scale information indicating the frequency range for VHF-TV selected in the storage circuit 4, the liquid crystal image display element 6 is adjusted. The channel selection is displayed on the screen for a certain period of time, superimposed on the TV image. Otherwise, when using AM, the operation is the same as when using FM. When using UHF-TV, V) 1? -The operation is similar to that on TV.

FIG. 5 is a diagram showing the channel selection display state of one embodiment of the portable receiving device according to the present invention, and is intended to further clarify the operation contents. (a) corresponds to the channel selection display state when IJ is selected in the operation explanation above,
A scale 15 indicating a frequency range for use in Japan and a frequency indication symbol 16 are displayed on a liquid crystal screen 17. The frequency indicating symbol moves in pixel steps of the liquid crystal image display element in the direction of the arrow to indicate all the predetermined frequencies based on the tuning voltage as described above. In this example, the scale indicating the frequency range is horizontal, and the frequency indication symbol is bar-shaped.
It goes without saying that any output can be made by simply changing the contents stored in the memory circuit 4.

Furthermore, liquid crystal image display elements are already capable of full color display, and it is also possible to improve visibility by displaying in different colors. (b) is the VEF-T in the above operation description.
This shows the channel selection display state when V is selected. A scale 18 and a channel designation symbol 19 indicating the range of Japanese domestic channels are displayed superimposed on the TV image.

〔Effect of the invention〕

As described above, the present invention is capable of selectively displaying information indicating each frequency range and an instruction of the receiving frequency for a certain period of time on the screen of a liquid crystal image display element for a plurality of receivable broadcasting frequency bands. Because of this structure, the currently selected frequency band matrix can be seen at a glance just by looking at the screen of the liquid crystal image display element, and there is no need to place multiple scales indicating frequency ranges on the device case. Therefore, visibility and operability are improved, and the zero constraint on design is greatly reduced. There is also a mechanical structure for indicating the receiving frequency (for example, a pointer and a belt type to move it,
There is no need for sliding/rotating mechanisms such as threading type
It becomes easy to use the iA device as it is light, thin, short and small. In addition, in the embodiment of the present invention, it is possible to receive 7! VHIF-TV as a combination of heart waves.

Although UH'F-TV, FM, and AMi have been taken up, it goes without saying that the contents of the present invention can be applied to any combination of other radio waves.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a portable receiver device of the present invention. FIGS. 2(a) and 2(b) are perspective views showing two ways of displaying channel selection in a conventional portable receiving device. FIGS. 5(a) and 5('b) are perspective views showing the channel selection display state of the portable receiving device according to the present invention. 1...Receiving block 2...Receiving circuit 5...Tuning selection circuit 4...Storage circuit 5...Display control circuit 6...Liquid crystal image display element S, , S, ,...8n ... Frequency band selection switch Sn+, ... Tuning status call switch 15.18
...Scale indicating frequency range 16.19...Frequency indication symbol or higher

Claims (1)

[Scope of Claims] a) Receiving means for receiving radio waves in a plurality of frequency bands including TV broadcast radio waves b) Liquid crystal image display means for displaying various images including TV images c) Regarding the plurality of frequency bands, Storage means for storing information indicating respective receivable frequency ranges d) Selectively displaying information indicating the frequency ranges stored in the storage means on the screen of the liquid crystal image display means for a certain period of time; Display control means for instructing (e) A portable receiving device comprising a frequency band changeover switch for switching a selection signal for determining which frequency band to select from among a plurality of receivable frequency bands.