JPH01305716A - Channel selection device in tuner - Google Patents

Abstract

PURPOSE:To simplify channel selection by sequentially channel-selecting broadcasting stations which coincide with the names of the broadcasting stations to be inputted. CONSTITUTION:In a travelling vehicle, a lead 14 is operated according to need, and a part of or all the names of the broadcasting stations are inputted. A control circuit 13 judges whether the name of the broadcasting station which coincides with the name of the broadcasting station till inputted characters in present or not in memories 16 and 17 by the operation of the channel-selection start lead provided in a part of the lead 14. When the name of the coincident broadcasting station is present, the frequency-dividing number corresponding to the broadcasting station is outputted. When the frequency-dividing number is inputted to a programmable frequency divider 8, and it is tuned to the broadcasting station, a tuned signal is outputted from a detection circuit 5, and the tuned broadcasting station is received.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention enables broadcasting by inputting the name of a broadcasting station using an operation button.
The present invention relates to a channel selection device in a tuner that is capable of selecting broadcasts from the broadcasting station.

[Conventional technology]

Conventionally, a manufacturer or a user inputs the name of a broadcasting station for a certain frequency, stores this station name in memory, and when the user presses a preset button to select that station,
There was a device that displayed the name of the broadcasting station on the display.

[Problem to be solved by the invention]

By the way, with the conventional device described above, it is not possible to select a station based on the name of the broadcasting station, so it is not possible to select a station based on the name of the broadcasting station. When you want to listen to FM broadcasts while moving, such as when listening to a stereo, if you know the name of the local station but not the frequency, there is a problem in that you cannot select the station you want to listen to.

[Purpose of the invention]

The present invention aims to solve the above-mentioned problems, and its purpose is to memorize the frequency corresponding to each broadcast station in advance, and when the name of the broadcast station is input using the operation button, the frequency corresponding to the input station is stored in advance. A channel selection device in a tuner is configured to search for a broadcasting station name that matches at least a part of the stored broadcasting station names from some or all of the broadcasting station names stored, and to sequentially select the searched broadcasting stations. It is not intended to be provided.

[Summary of the invention]

In order to achieve the above-mentioned object, the present invention has the following features:
By memorizing the frequency corresponding to the broadcast station and inputting all or part of the station name using the operation button,
The gist of this system is to sequentially select broadcast stations that match the input broadcast station name.

[Embodiment of the Invention] An embodiment of the present invention will be described below with reference to FIG. The figure shows the case of a digital synthesizer tuner, where 1 is an antenna, 2 is an RF amplifier, 3 is a mixer, 4 is an IF amplifier,
5 is a detection circuit, 6 is ■Co as a local oscillator, 7 is a prescaler that converts the output of said ■co to 174, 8 is a programmable frequency divider, 9 is a low-pass filter, 1o is a phase comparator, II is a frequency divider, Reference numeral 12 designates a reference crystal oscillator, and the above is a known circuit configuration.

That is, when attempting to receive an FM broadcast of 80 MHz, the VCO 6 must oscillate (80-10.7 MHz). Therefore, if the frequency division number input to the programmable frequency divider 8 is set to N = 693 (usually a variable frequency divider is used) and the frequency division number of the prescaler 7 is set to 4, then the input to the phase comparator 1o is , and one input of the phase comparator 10 sets the oscillation frequency of the reference crystal oscillator 12 to 10
If the frequency is 0 KHz and the frequency division number of the frequency divider 11 is 4, a frequency component of is applied, and since a PLL including the VCO 6 is configured, the frequency f of the VCO 6 is controlled to be 69.3 MHz. It turns out. in this way,
When varying the reception frequency, change the division number of the programmable frequency divider 8 (for the FM band, N = 654 to 79).
2) The reception frequency corresponding to the frequency division number is determined.

Also, in the case of AM broadcasting, the channel space is 9KT.
For Iz, the reference frequency is set to 9KHz, and VC
It controls O6.

Reference numeral 13 designates a control circuit that performs operations to be described later, in which the output signal from the above-mentioned detection circuit 5 and the signal from the operation button 14 are input manually, and the signal to the display 15 and the above-mentioned programmable frequency divider 8 are inputted manually. The frequency division number is output. The operation buttons 14 described above are manually operated, for example, by inputting the name of a broadcasting station directly using alphabet keys, or inputting alphabets by sequentially operating up/down buttons.
Further, the display 15 can display characters input using the operation button 14, for example, the name of a broadcasting station such as NHK.

Reference numeral 16 denotes a memory such as a ROM in which signals symbolizing a large number of broadcasting station names and frequency division numbers corresponding to the broadcasting station names are stored;
7 is a RAM that stores the name of the selected broadcasting station and the frequency division number when the selected broadcasting station is stored using a preset button or the like;
etc. memory.

Next, the operation will be explained based on the above-described configuration with reference to the flowchart shown in FIG.

If you are currently listening to a program from a certain FM broadcasting station while driving in a car, and the radio waves of that station become weak and it becomes difficult to listen to it, the name of the broadcasting station in the area where the listener is driving is If you know the frequency, but you cannot find it, press operation button 14.
Enter part or all of the broadcasting station name (step 31).

Next, when the channel selection start button provided as part of the operation 6014 is operated (step S2), the control circuit 13 stores in the memory 16.17 the broadcasting station name that matches the broadcasting station name up to the input characters. Step S3)
If there is a matching broadcast station name, the frequency division number corresponding to that broadcast station is output. This output frequency division number is manually inputted to the programmable frequency divider 8, so when it is tuned to that broadcasting station by the operation explained in FIG. 1, a tuned signal is output from the detection circuit 5. A state is entered in which the broadcast station that has been received is received (step S4).

Furthermore, the control circuit 13 searches the memories 16 and 17 to see if there is another broadcasting station with the same name as the inputted broadcasting station name (step S5), and if there is no broadcasting station with the same name, the selected broadcasting station is The operation ends with the received state of the broadcast station being broadcast being maintained. On the other hand, if there are other same broadcasting stations, please keep the reception status of the currently tuned broadcasting station for a few seconds in step 3.
6) In this state, the control circuit 13 searches whether or not the channel selection switch 711 provided as a part of the operation button 14 has been pressed (step S7). If the button is pressed within the above-mentioned time, the operation ends with the broadcast of the currently received broadcast station being received. On the other hand, if the tuning stop button is not pressed within the time period, the process returns to step S4 and starts tuning another broadcasting station that partially matches.

In addition, the broadcasting station name of some of the characters you entered is stored in memory 16.1.
7, if the input radio waves are weak, synchronization cannot be achieved, so after searching for this broadcasting station, immediately return to step S4 and search for the next broadcasting station that partially matches. You can also set it to start.

Furthermore, even if there is a broadcast station that matches all the characters you entered, if the input radio waves are weak, you will not be able to tune in. Therefore, the display 15 will indicate that there is a corresponding broadcast station but you cannot tune in. It is also possible to display the information.

Note that in step S3 described above, if there is no broadcasting station name inputted by the operation button 14 in the memory 16,
The channel selection operation ends in this state.

Furthermore, since the above-mentioned tuning state is stored in the memory 17, it can also be stored using a preset button (not shown).

〔Effect of the invention〕

As described above, the present invention allows you to store the broadcast station name in memory even if you do not know the frequency of the broadcast station or the preset name of the broadcast station by manually inputting part or all of the station name by operating the operation button. If some or all of the station names match, you can easily select a station. Therefore, in cases where the frequency of the broadcast station changes, such as on a car stereo, This has the effect of making it very easy to select a channel even if you only know part of it.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of a channel selection device in a tuner according to the present invention, and FIG. 2 is a flowchart of a control circuit in the same block diagram.

Claims (1)

[Claims] A tuner capable of selecting a preset broadcasting station by varying the division number of a programmable frequency divider to a preset value, comprising: a large number of broadcasting station names; A memory such as a ROM that stores the frequency division number corresponding to the frequency division number, an operation button that allows the name of a broadcasting station to be input by key operation, and a display that displays part or all of the name of the broadcasting station input using the operation button. Then, it is determined whether some or all of the broadcast station names input by the operation button are stored in the memory, and if they are stored, the frequency division number corresponding to the broadcast station name is determined from the memory. A control circuit for sending a signal to a programmable frequency divider of the tuner.