JPS5862921A - Broadcasting receiver - Google Patents

Abstract

PURPOSE:To eliminate unnecessary frequency display and to speed up channel selecting time, by avoiding the display of frequency change during channel selection and displaying a frequency tuned to the frequency for channel selection on a display section. CONSTITUTION:At step-up and step-down of channel selection, the frequency dividing ratio of a program counter 7 is changed by the channel space, and the frequency information of the channel space is not outputted on a display section 10. Thus, the display of the display section 10 indicates the frequency previously received. When turning is made with a desired signal, the instruction is given to a disital synthesizer controller 9, which outputs an instruction changing the display into the desired tuning frequency to the display section 10. The display section 10 displays the desired tuning frequency with this instruction. Thus, an instruction time outputting the channel space frequency and its holding time are not required and the channel selection time can be quickened.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a broadcast receiver that receives radio waves broadcast in medium waves, short waves, M waves, etc., and particularly relates to a method for displaying received broadcast reception frequencies. It is something.

In general, broadcast receivers that use a digital synthesizer tuning system are capable of tuning to the desired broadcast reception frequency (manually or automatically). A common method is to select (scan) and display the desired reception frequency on the teaching section.

Also, while selecting a channel, the display section shows the frequency WXt that is being stepped up or down for each reference frequency (channel space) given to the digital synthesizer tuning system.
'' are also generally displayed for each channel space.

In this kind of display method, 1. For example, taking PM broadcasting as an example, there are some differences depending on the country.10Gk) is also #12
Although the broadcast band is divided into channels in the channel space of 00k), in reality, it is considered as receivable broadcast radio waves, and the broadcast radio waves are allocated to all the channels allocated to the entire broadcast band. Not only that, but due to circumstances, the current situation is that some of the radio waves are allocated to some channels. However, the reception of Fubo radio waves
- To select the desired radio wave, use Step A, P or Step Down. In this case, even if there is no broadcasting station between the allocated channels and spaces to the desired reception station, it is customary to display the frequency display for each allocated channel and space on the display, and for that reason, digital medium tuning is used. - The command for display from the system is issued from the digital synthesizer controller, and the time of the command determines the time during channel selection (scanning).

Step up and step up during channel selection (scanning)
The time required to download the number of messages m5ecyP74t is 9
．． Furthermore, in order to prevent flickering of the display frequency during channel selection and to stabilize the display, display commands ranging from a few tens of m5ec to several hundred m5ec are held before the display operation, which has the disadvantage that the time for selecting a channel cannot be made quickly. Also, the display frequency changes while selecting a channel, and you can't tell which channel you were previously tuned to.It's very annoying and strange.

SUMMARY OF THE INVENTION An object of the present invention is to provide an IM device that eliminates unnecessary frequency display and shortens the tuning time.

In other words, the receiver 4 according to the present invention is received at a desired frequency within the broadcast band, and after tuning, the tuned frequency is displayed on the display, and the displayed frequency is not tuned to the next desired reception frequency. The limit remains unchanged.

Therefore, when the display is open, the received frequency before tuning is displayed without changing. Therefore, when selecting one channel, the display command time for each Hiro channel / H base and the holding time such as display flickering can be saved, and the tuning time is reduced. In addition to processing the speed time quickly, it also has a last channel memory function because it displays the reception frequency t'' before tuning. It is something that you have.

The present invention will be explained in detail below with reference to one drawing.

Figure 1 #: t, digital e-synthesizer used in such invention? )”
FIG. 2 is a configuration block diagram showing an example of a part of the L and L synthesizers. That is, the crystal oscillator 1 and the oscillator 2 generate the reference frequency i signal. This signal is sent to the frequency multiplier 3 and converted into the necessary frequency signal.The output of the frequency multiplier 3 becomes one of the input signals of the phase detector 4, and the input signal of 0 phase detection where phases are compared! The output of 4 is sent to the bus filter CL, P,',>
The voltage control output @(VC(J)6 becomes the oscillation control signal through 5t-.

The output of VCu6 is used as the station m axial vibration frequency signal; b
, VCueotb force amata, Glisk-? 8t-through 1
The signal is supplied to the four-gram counter 7 and divided into outputs of the Vcu 6 according to the frequency division ratio set by the digital synthesizer control unit 29 to the carantaf. The output of Carantha 0 becomes the input of the phase detector 400000. Therefore, according to the frequency division ratio set in the program converter 7 by rLLtD, the output frequency ripples of the station m are ashed by the output of the vco 6, and the power-off broadcasting station O is received. 0-29 is the frequency to be displayed on the display section 1O. Manual or automatic transmission is performed via the key switches on the input keyboard 111, and the :I controller 9#i is operated. The key switch ' is determined and the operation is performed based on that key switch.

This 7' lock 1IIIR is a normal digital lock.
A one-shot receiver without a synthesizer is also available, but the frequency display on the display section 1G by the controller 9 of the present invention is devised for the above-mentioned purpose. In other words, during step, step up, and step down during one channel selection (scan) operation, the % control 99 changes the 10 gran ng 1 power counter 70 frequency division ratio by the amount of the channel space, but the frequency information line of that channel space Do not output to display unit IO. Therefore, 1 display area lO
The display line is the frequency broadcast (last channel) that was previously received. Then, when synchronization with the confidence signal is achieved, the command is transmitted to the digital synthesizer controller section 9. 0-99 is displayed on the display lO - Issue a new command to change to the desired tuning frequency. From that command, the display lO shows the rare electric wave number w4JIid.
I can buy L things.

Therefore, as in the past, the channel contention space frequency t
- It is not necessary to output the command time and the time to hold it, and the time for selecting one station is accelerated.In addition, the rare M1m
Since the frequency of the last channel is displayed until the wave number is received, there is no inconvenience that the last channel disappears at the same time as the first channel selection starts.

An embodiment of the present invention has been described above, but in addition to the display retaining the previously tuned frequency until the next tuning point, the display may be turned off while tuning or set to another display. Obviously, various modifications are possible.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the PLL synthesizer portion of the digital synthesizer tuning system. 1... Oscillator (crystal oscillator), 2...
Axial vibrator, 3... Frequency multiplier, 4...
Phase detector', 5...1, i', F, (low pass filter), 6...vcu. 7...Program 2m counter, 8...
・Brisket 2, 9...Digital synthesizer controller section, 10...Display section, 11
・・・・・・Written amendment to incoming Kakibo procedure (spontaneous) Commissioner of the Japan Patent Office 1, Indication of the case 1982 Patent Application No. 16118
No. 9 No. 2, Title of the invention Broadcasting receiver 3, Relationship to the amended case Applicant 5-33-1 Shiba, Minato-ku, Tokyo (423) NEC Corporation Representative Tadahiro Sekimoto 4, Agent Address: 37-8 Shiba 5-chome, Minato-ku, Tokyo 108 □ Resident: Mita Building & Column 6 of “Detailed Description of the Invention” of the specification to be amended, Contents of the amendment (1,) Page 5 of the specification IO Correct "by PLL0" in line 1 to "by PLL". (2) On page 5, line 20, "Sesizer free type" is corrected to "Sesizer one type".

Claims (1)

[Claims] The tuned first frequency broadcast is taught to the display section, and the second
The frequency change is not displayed while the tuner is tuned to the 20th frequency broadcast, and when the 20th frequency broadcast is tuned, the 20th frequency broadcast is displayed on the display section. Broadcast receiver.