JPH0683027B2 - Automatic ski yan station - Google Patents

Description

TECHNICAL FIELD The present invention relates to an automatic scan channel selection device used in a TV tuner, a radio tuner, and the like.

[Outline of Invention]

This is a receiver in which a plurality of arbitrary tuning preset buttons are set to automatically scan and tune designated stations at set time intervals, and it is possible to automatically search only the program content to be watched in a desired time width.

[Conventional technology]

A TV tuner and a radio tuner that can perform preset channel selection are provided with a function called memory scan that automatically performs channel selection at fixed time intervals in the order of preset buttons corresponding to each station. This is a convenient function because you do not have to operate the tuning dial or channel knob when selecting a channel.

[Problems to be solved by the invention]

If the number of preset stations is large, it takes a long time to finish selecting all the stations, so that the stay time of one station cannot be lengthened and the operation becomes busy. Or, depending on the person, the interval between channel selections may be too long and may be bothersome. Further, there is an inconvenience that it is necessary to scan all stations regardless of whether the program to be watched differs depending on the person or the time of day, such as news, classical music, rock music and sports programs.

In view of this point, the present invention has an object to enable a search in a desired scan channel selection mode.

[Means for solving problems]

A storage means (designated memory 2b) is provided for storing a plurality of arbitrary designated channel selections by operating a channel selection preset button of the receiver and designated time interval values by operating a time interval setting key.

At the time of automatic scanning channel selection, the control unit sequentially derives channel selection preset data of the specified station to the reception circuit at each of the specified time intervals based on the contents of the storage unit.

With this configuration, the troublesomeness of scanning all preset stations is eliminated, and optimum program search can be performed.

〔Example〕

FIG. 1 is a block diagram of a TV / radio tuner showing an embodiment of the present invention, and FIG. 2 shows an arrangement of tuning buttons in an operation section of the tuner. The key operation output obtained from the key matrix circuit 1 of FIG. 1 connected to this operation unit is given to the controller 2 having a microprocessor, and the tuning data is read from the nonvolatile preset memory 2a in the controller 2, and the radio or radio It is led to the PLL circuit 3 or 4 of the TV. The tuning data is the frequency division ratio of the PL loop.

In the radio system, the PLL circuit 3 determined by the tuning data
IF conversion is performed in the front end 5 based on the oscillating frequency of, the IF output is detected by the wave detector 7 through the IF circuit 6, and further separated into L and R audio signals by the stereo demodulation circuit 8.

Similarly, in the TV system, IF conversion is performed in the front end 9 based on the oscillation frequency of the PLL circuit 6 determined by the channel selection data, and the video signal is amplified and detected by the video IF circuit 10 to obtain the video signal. The signal is derived. A sound IF circuit 11 amplifies and detects a sound signal, and a stereo demodulation circuit 12 separates the sound signal into L and R sound signals.

In the display 13, as shown in FIG.
Channel selection frequency display 13a, band display 13b, received signal level display 13c and the like are performed.

As shown in FIG. 2, the operation section is provided with FM and AM preset buttons 14a, 14b, 14c, ..., TV channel selection buttons 15a, 15b, 15c. Further, there are provided up / down keys 16a and 16b for the reception frequency corresponding to the tuning dial of the radio.

A designation button 18 and a memory scan button 19 are further provided to perform automatic scan channel selection.

At the time of memory scan, as shown in the flow chart of FIG. 4, first, the designation button 18 is pressed. Then, the controller 2 is set to the designated mode, and the instruction display 13d on the display 12 is turned on. In this mode, when the radio preset buttons 14a, 14b ... or TV tuning buttons 15a, 15b ... of any group are selected, the corresponding codes of the preset buttons or tuning buttons are designated in the controller 2 in the selected order. Written to memory 2b. For example, if you want to listen to rock shows, FM Tokyo, FEN,
If you want to watch a baseball broadcast by selecting a series of groups such as ……, you can select a series of AM broadcasts or a fourth of TV broadcasts.
Channel 6 ... Select a series of groups.

Furthermore, it is possible to specify the time interval between stations for automatic scanning. Up / down key 16 in Fig. 2 in designated mode
A and 16b serve as time designation keys. For example, when the up key 16b is pressed, the time interval is extended by 1 second for each key operation from the standard designation of 4.5 seconds, and conversely, when the down key 16a is pressed, the time interval is shortened. By this operation, a desired scan time interval is obtained, and the corresponding data is written in the designated memory 2b of the controller 2. The time interval is displayed on the frequency display 12a of the display unit 12. Also, the time interval can be set individually for each designated station.

Next, when the memory scan button 19 is pressed, the controller 2 enters the scan mode and the memory scan display 13 on the display 12 is displayed.
e lights up. Then, based on the contents of the designated memory 2b, the data in the preset memory 2a is led to the PLL circuit 3 or 4 every designated time period in the designated order. As a result, the designated groups are sequentially selected.

At the program you want to watch, the corresponding preset button 14a, 14b
.. or the channel selection buttons 15a, 15b .. .., a stop signal is output and scanning is stopped, as shown in the flow chart of FIG. 4, and the station can be subsequently viewed. Until the stop signal is output, the automatic scan channel selection is repeated with the designated group as one cycle.

〔The invention's effect〕

As described above, according to the present invention, automatic scan channel selection can be performed with a desired designated station and time width, so that a program having a desired content can be quickly searched.

[Brief description of drawings]

FIG. 1 is a block diagram of a main part of a TV / radio tuner of an embodiment of the present invention, FIG. 2 is a view showing a preset button row and a tuning button row of an operation portion, and FIG. 3 is a display surface showing an example of display. And FIG. 4 is a flowchart showing the memory scan operation. In the reference numerals used in the drawings, 1 key matrix circuit 2 controller 2a preset memory 2b designated memory 5 front end 14a, 14b preset button 15a, 15b channel select button 18 ... Designation button 19 ... It is a memory scan button.

Claims (1)

[Claims] 1. Storage means for respectively storing a plurality of designated stations by operating a channel selection preset button of a receiver and designated time interval values by operating a time interval setting key, and the storage means for automatically scanning channel selection. Based on the content of the means
An automatic scan channel selection apparatus comprising: a control unit that sequentially derives channel selection preset data of the designated station to the receiving circuit at each of the designated time intervals.