JPH0559982U - Signal receiver - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a signal receiver for receiving a signal or the like from a broadcasting station, and in particular, a signal receiver having a so-called preset scan function and an auto memory function which does not designate the same station twice. The purpose is to A frequency selecting means 1 for selecting a signal having a predetermined carrier frequency from a received signal, a signal detecting means 2 for detecting a target signal from the signals selected by the frequency selecting means 1, and the signal. In a signal receiver comprising an amplifying means 3 for amplifying and outputting a signal from the detecting means 2, one of the carrier frequency signals registered by controlling the frequency selecting means 1 and overlapping the previously registered carrier frequency signals. Except for the channel selection means 4 for sequentially receiving.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a signal receiving device for receiving a signal from a radio or television broadcasting station or various signals that are used in multiplex such as space division. In particular, the present invention relates to a signal receiving device that automatically scans within a reception frequency band to receive a carrier frequency ( In the following, the broadcast frequency will be registered in the memory inside the device (auto memory function), and the broadcast frequency that can be received automatically or manually can be read from the memory in which the broadcast frequency is registered. The present invention relates to a signal receiver having a function (preset scan function) of transmitting and sequentially receiving broadcasts from the registered stations at a fixed time interval using the broadcast frequency.

[0002]

[Prior Art]

 In recent years, various types of radio and television broadcasts have been performed using satellite broadcasts and various specialized stations, and the number of broadcast channels has been increasing. In addition, the equipment that receives these broadcasts has expanded its installation range from conventional homes to mobiles such as automobiles. In the latter case, that is, in the case of in-vehicle radios and television receivers, broadcasts from the same station are also available. The reception frequency changes depending on factors such as the movement of radio stations, and it is necessary to receive broadcasts from terrestrial broadcasting stations that are in motion. It is equipped with memory function, preset function and preset scan function.

The preset function is that the user pre-registers several broadcasting stations (that is, broadcasting frequencies) in the memory of the device corresponding to the preset switch of the receiver according to his preference and operates the preset switch. This is a function that allows you to immediately call out the broadcast of the desired station. The auto memory function automatically performs the preset, and is effective when receiving a broadcast in the area when the vehicle is moved or when the reception frequency changes. In addition, the preset scan function scans the preset stations at regular time intervals (for example, every 5 seconds) to let the driver hear the program at that time and easily select a favorite program from them. is there.

FIG. 7 is a schematic diagram for explaining the conventional auto memory function and preset scan operation. FIG. 7 (a) schematically illustrates the auto-memory function, in which the frequency is plotted along the horizontal axis and the electric field strength with respect to the frequency is plotted along the vertical axis. When the auto memory function is designated, for example, scanning is automatically started from a low frequency to a high frequency within the reception frequency band, and in the example of the figure, broadcast frequencies f _{0 to} f ₈ are sequentially detected. Then, in order from the one with the highest electric field strength, only the number of auto memory setting channels of the device (CH1 to CH6 in the figure (b)) are selected, and the memory is set as the auto preset value shown in the lower part of the figure (b). Memorized in. In the middle of the figure, the manual preset values that are manually set according to the user's preference are shown. These preset channels can be individually selected by operating the preset switch corresponding to each of them, or can be easily selected while listening to each broadcast by using the preset scan function described above. When the conventional preset scan function is used, channel selection is performed sequentially in the direction of the arrow indicated by the dotted line in FIG.

[0005]

[Problems to be solved by the device]

However, when the conventional auto-memory function is used, the frequencies are duplicated between the manual preset value and the auto-preset value as the frequencies f ₀ , f ₁ and f ₄ surrounded by the bold line in FIG. 7B. However, in the conventional preset scan function, the designation was simply and repeatedly executed in the direction of the arrow shown by the dotted line in the conventional preset scan function. Therefore, when the conventional auto-preset function is used, the same broadcast content may be heard twice, which is uncomfortable and unfavorable for a driver who wants to tune in quickly. In addition, if the conventional auto memory function is used, duplicate specification occurs as described above, the limited valuable memory in the device is wasted, and the number of channels that should be able to be received is duplicated and cannot be received. It caused the inconvenience.

In view of the above problems, the present invention has been made in view of the above problems, in which the signal receiver is configured so that the same broadcast is not received twice or the same channel is not redundantly registered even if there are overlappingly registered channels. The purpose is to provide.

[0007]

[Means for Solving the Problems]

 According to the present invention, as shown in the basic configuration of FIG. 1, a frequency selecting unit 1 for selecting a signal of a predetermined broadcast frequency from a received signal, and an object selected from the signals selected by the frequency selecting unit 1 In the signal receiver comprising the signal detecting means 2 for detecting the signal to be output and the amplifying means 3 for amplifying and outputting the signal from the signal detecting means 2, the frequency selecting means 1 is controlled and registered first. Channel selection control means 4 for sequentially receiving the broadcast frequency signals except one of the broadcast frequency signals registered in duplicate, or the frequency selection means 1 is scanned within the reception frequency band to detect the signal. A signal receiver having a tuning control means 4 for registering a receivable broadcast frequency signal from the signal detected by the means 2 excluding the already registered broadcast frequency signal is provided.

[0008]

[Action]

 The frequency selection means 1 mixes an input signal received from an antenna and the like and a signal of a frequency instructed by the tuning control means 4 to perform frequency conversion to detect a signal having a desired broadcast frequency in the next stage. Give to means 2. The signal detecting means 2 decodes the signal to obtain a final target signal, for example, an audio signal or the like, gives information about the signal to the channel selecting means 4, and the audio signal or the like is given to the amplifying means 3 at the next stage. The amplification means 3 amplifies it and drives an external speaker or the like. The channel selection means 4 uses the information provided by the signal detection means 2 to prevent the above-mentioned function, that is, the preset scan function that never receives the same broadcast twice or the duplicate registration of the same broadcast. The frequency selecting means 1 is controlled to execute the auto memory function.

[0009]

【Example】

 FIG. 2 is a block diagram of a radio receiver of the signal receiver according to the present invention. As for each block of FIG. 2, in relation to the signal receiver according to the present invention of FIG. 1, the front end 11 is the frequency conversion means 1, the detection circuit 12 is the signal detection means 2, and the amplifier 13 is the amplification means 3. , And a tuning portion 14 composed of a microcomputer 17, a RAM 18 and a switch 19 and surrounded by a dotted line corresponds to the tuning means 4.

In FIG. 2, the signal received by the antenna 15 is input to the front end (F / E) 11. The front end 11 is a high-frequency amplifier circuit to which the signal is input, a mixing circuit for mixing the output of the high-frequency amplifier circuit and a local oscillation signal from the local oscillation circuit, and an intermediate frequency converted by the mixing circuit. It consists of an intermediate frequency amplification circuit for amplifying the signal. The detection circuit 12 decodes the output signal from the front end 11 into an audio signal, for example, detects the envelope of the intermediate frequency signal and outputs it to the amplifier 13 in the next stage. The amplifier 13 drives the speaker 16 1 by the amplified output. The microcomputer 17 uses a random access memory (RAM) 18 and a switch (SW) 19 for instructing an operation from the outside to control the receiver, control the reception frequency, preset operation, and the like.

The control of the reception state is performed using the IFD signal 20 and the S level signal 21 provided from the detection circuit 12 to the microcomputer 17. The IFD signal 20 indicates that the output level of the intermediate frequency signal from the front end 11 of the preceding stage is equal to or higher than a predetermined value, that is, whether or not there is a broadcasting station at the reception frequency, and the S level signal 21 indicates the actual intermediate frequency signal at that time. Is a signal indicating the level of. The reception frequency is controlled by giving a signal from the microcomputer 17 to the front end 11 to instruct the reception frequency. The front end 11 gives a frequency division ratio to a variable frequency divider of a PLL (phase locked loop) circuit which constitutes an internal local oscillation circuit by the instruction signal and generates a local oscillation signal for mixing with an input signal. Further, the preset function is such that the microcomputer 17 detects that the switch 19 is pressed down, and accordingly, the frequency value currently being received is written in the RAM 18 in association with the switch, or is already registered in the RAM 18. It is performed by reading the frequency value corresponding to the switch and controlling the peripheral device.

Next, the tuning portion 14 that executes the preset scan function and the auto memory function according to the present invention will be described in detail with reference to FIGS. 3 to 6. FIG. 3 is a flow chart for explaining an example of the preset scan operation according to the present invention. In step S10, the microcomputer 17 first reads all preset N values (dividing ratios) (which may be either manual preset or auto preset) already registered in the RAM 18. In addition to the reception frequency, the reception electric field strength and the like stored at the time of presetting are also used as necessary. Next, in step S11, it is determined whether or not all the N values (dividing ratios) have the same value, and if all have different N values (dividing ratios), the all received frequency f _r is scanned by sequentially aforementioned predetermined time (about 5 seconds) corresponds to the N value (frequency division ratio) (S13). If N values that overlap each other are found (S11), the scan order excluding one of the N values is reset (S12), and the scan is started according to a new order that does not overlap (S13). ..

FIG. 5 shows this in correspondence with the conventional FIG. 7 (b). As shown by a dotted arrow in the figure, overlapping reception frequencies on the auto preset value side with respect to the manual preset value are shown. The f ₀ , f ₁ and f ₄ will not be redundantly scanned in the present invention.

Next, an example of the auto memory operation according to the present invention will be described with reference to the flowchart shown in FIG. In step S20, all N values are read in as in step S10 of FIG. Next, in step S21, scanning within the reception frequency band is started from a low frequency, for example, and the broadcast frequency is detected using the above-mentioned IFD signal and S level signal. When the broadcast frequency is detected, it is compared with all the above N values (dividing ratio) (S22). If they do not match, that is, if duplicate registration is not performed, the N value corresponding to the broadcast frequency Is temporarily registered in a temporary storage area in the RAM 18 (S23). This tentative registration is to prevent the preset contents from being mixed with old and new ones when the auto memory function is canceled halfway if the contents are constantly updated to new contents (main registration). Done. Therefore, final registration is performed after all scans are completed (S25). If the matching N value is found in step S22, that is, if the broadcast frequency has already been registered, the provisional registration is not performed. In step S24, it is determined whether or not the scan within the reception frequency band has been completed (whether the maximum frequency has been reached). If it has not been completed, the scan continues, and if it has completed, the contents of the temporary registration Is officially registered (S25).

FIG. 6 shows this in correspondence with FIG. 7B of the related art, and the manual preset value is excluded from the auto preset value. In this case, effective use of memory and maximum A preset number can be achieved at the same time. When the auto memory function of the present invention is used, as a matter of course, since the manual preset value and the auto preset value are not redundantly registered, even if the conventional preset scan is used, the same broadcast is heard twice. There is no such thing.

The above-described flowcharts shown in FIGS. 3 and 4 show an example. For example, the microcomputer 17 used does not have an internal RAM, so that the steps S10 and S20 are performed. Of course, it may not be possible to read a large amount of data at a time, and in that case, it goes without saying that data may be sent to and received from the external RAM 18 via the arithmetic register or the like.

[0017]

[Effect of the device]

 As described above, the signal transmitter / receiver according to the present invention does not specify the same frequency, that is, the same broadcast twice when executing the preset scan function and the auto memory function, and is convenient for the driver to comfortably select a channel. give. Further, by using the auto memory function according to the present invention, the minimum memory usage and the maximum number of tunings are automatically achieved.

[Brief description of drawings]

FIG. 1 is a block diagram showing a basic configuration of the present invention.

FIG. 2 is a block diagram showing an embodiment of a radio receiver according to the present invention.

FIG. 3 is a control flow chart showing an example of a preset scan according to the present invention.

FIG. 4 is a control flow diagram showing an example of an auto memory according to the present invention.

FIG. 5 is an explanatory diagram schematically illustrating the preset scan of FIG.

6 is an explanatory diagram schematically illustrating the auto memory of FIG.

FIG. 7 is an explanatory diagram schematically illustrating an example of a conventional auto memory and preset scan operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Frequency selection means 2 ... Signal detection means 3 ... Amplification means 4 ... Channel selection means 11 ... Front end 12 ... Detection circuit 13 ... Amplifier 14 ... Channel selection part 15 ... Antenna 16 ... Speaker 17 ... Microcomputer 18 ... RAM 19 ... Switch 20 ... IFD signal 21 ... S level signal

Claims (2)

[Scope of utility model registration request] 1. A frequency selection means (1) for selecting a signal of a predetermined carrier frequency from a received signal, and a signal detection for detecting a target signal from the signals selected by the frequency selection means (1). In the signal receiver comprising the means (2) and the amplifying means (3) for amplifying and outputting the signal from the signal detecting means (2), the frequency selecting means (1) is controlled, and the previously registered carrier is controlled. A signal receiver comprising a tuning control means (4) for sequentially receiving a frequency signal except one of the registered carrier frequency signals. 2. Frequency selection means (1) for selecting a signal of a predetermined carrier frequency from a received signal, and signal detection for detecting a target signal from the signals selected by the frequency selection means (1). In the signal receiver comprising the means (2) and the amplification means (3) for amplifying and outputting the signal from the signal detection means (2), the frequency selection means (1) is scanned within the reception frequency band and A signal receiver comprising a tuning control means (4) for registering a receivable carrier frequency signal from a signal detected by the signal detecting means (2) by removing a carrier frequency signal already registered. .