JPH0528820Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention is suitable for use in synthesizer-type FM receivers, etc., and in particular, it is possible to create a preset channel auto scan mode without increasing the number of operation keys. The present invention relates to a receiver having a synthesizer tuner capable of performing.

[Prior Art] In a receiver having a synthesizer tuner, for example, a synthesizer type FM receiver, a plurality of channels are registered in advance, and a preset key for channel presetting is used to easily select a channel later. is provided.

FIG. 5 shows an example of the operation panel 5.
0 are provided with keys for channel presetting, in this example three preset keys 51 to 53 so that three broadcast stations can be preset.

Furthermore, a memory key 54 is provided for use in channel presetting, and an up key 56 and a down key 55 are also provided for raising or lowering the sweep frequency.

Note that 58 is a digital display made of an LCD or the like, on which the received frequency, preset frequency, etc. are displayed.

Now, in the case of a receiver equipped with such a synthesizer tuner, if you want to sequentially tune in a plurality of preset broadcast stations and select the desired broadcast station, it is necessary to press each preset key in sequence. There is. However, this operation is surprisingly troublesome.

In order to automate this operation, a preset scan key may be provided so that the preset channels can be automatically scanned when this key is operated.

[Problems to be Solved by the Invention] By the way, if a preset scan key is provided in this way, the preset channels can be automatically scanned, which is very convenient.

However, on the other hand, it is necessary to add new keys, which increases costs. Furthermore, the miniaturized receiver does not have enough space to install an additional key.

If keys are placed close together, the operability of the keys must be sacrificed.

Therefore, this invention solves these conventional problems and proposes a receiver having a synthesizer tuner that realizes an auto-scan mode of preset channels without increasing the number of keys.

[Means for Solving the Problems] In order to solve the above problems, this invention provides a plurality of preset keys for presetting a plurality of channels, and an UP and DOWN key for raising and lowering channels one step at a time. In a receiver equipped with a synthesizer tuner that enters auto scan mode when the up and down keys are pressed for a predetermined period of time or more, if any one of the plurality of preset keys is pressed for a predetermined period of time or more. When pressed, preset channels are automatically scanned.

[Function] When a specific or arbitrary key among the plurality of keys provided on the operation panel 50 is operated continuously for a predetermined period of time or more, this operation mode is determined to be the preset channel auto scan mode.

At that time, the preset channels are sequentially selected at predetermined time intervals. If you press the key at the station you want to listen to, that preset channel will continue to be received.

The time for determining whether or not the preset channel is in auto scan mode is arbitrary, but considering that it usually takes less than 1 second to operate a certain key, what is the predetermined time for this determination? 1
It can be set to about seconds.

[Example] Next, an example of a receiver having a synthesizer tuner according to the present invention is applied to a synthesizer type FM receiver as described above.
This will be explained in detail with reference to FIG. 1 and subsequent figures.

Figure 1 shows the synthesizer method according to this invention.
1 is a system diagram showing an example of an FM receiver 10. FIG.

1 is a high frequency amplification circuit constituting a front end, and 2 is a mixer. A synthesizer tuner 20 configured as a PLL is connected to the mixer 2.

3 is an intermediate frequency amplifier circuit, 4 is an FM detector, 5 is a muting circuit, 6 is a low frequency amplifier, and 7 is a speaker. The muting circuit 5 is controlled by a microcomputer 30.

The synthesizer tuner 20 has a PLL configuration. Therefore, it has a fixed reference oscillator 21 and a variable oscillator 22, and the output of the variable oscillator 22 is supplied to the mixer 2 as its local oscillation signal.
It is supplied to the programmable divider 23, the divider output and the reference oscillation output of the reference oscillator 21 are phase-compared in the phase comparator 24, and the phase comparison output is supplied as a voltage control signal to the variable oscillator 22 via the low-pass filter 25. .

The programmable divider 23 is supplied with a command signal necessary for receiving a predetermined broadcast station from the microcomputer 30 that controls various controls of the FM receiver 10, and the programmable divider 23 is programmed according to the command signal. Value is controlled.

When a broadcast station is received, the signal detector 40 amplifies and detects a high frequency signal changed to an intermediate frequency, and outputs the presence or absence of the broadcast station.

The microcomputer 30 has an operation panel 50.
The microcomputer 30 then outputs a signal indicating the selected frequency to the display 58.

The microcomputer 30 contains a control program and the like for executing the auto scan mode of the preset channel.

The preset channel auto scan mode is such that when a key is pressed and this key is pressed continuously for a predetermined period of time, the preset channels are automatically scanned sequentially at regular intervals. Refers to the channel selection mode.

As long as any one of the above-mentioned keys can be specified as the key for auto-scanning, it is also possible to accept any key.

In the embodiment, the automatic scan mode is entered by operating a specific key. In this example, the preset key 51 is used as the key.

FIG. 2 is a control flow chart showing an example of a control program for realizing this auto-scan mode.

In the example described below, it is assumed that a predetermined broadcast station has already been preset in each of the three preset keys 51-53.

When the receiver is powered on, preset initialization is performed (step 61). In the embodiment, preset key 51=80.0MHz, preset key 52=82.5MHz, and preset key 53=84.7MHz.

Next, after the contents of the preset keys are read, key operations are checked (step
62).

First, when no key is pressed,
The condition is detected by steps 63, 71, 73, 75, 76, and 77, and the original routine is returned.

On the other hand, when the preset key 51 is pressed, the corresponding preset channel is called up and enters the receiving state, and the display 58
The preset frequency is displayed (step
63, 64).

Next, the operation time of the preset key is checked (step 65), and if this is within a predetermined time, one second in this example, the selected channel will continue to be received.

However, when a predetermined period of time has elapsed, the auto scan mode is determined and the following processing is executed.

In other words, since this state is the auto scan mode, the display 58 displays a message to that effect (for example,
P.SCAN) is performed, and the channel frequency of the preset channel is set at predetermined intervals (for example, every 5 seconds), and its contents are read out (steps 66 to 68). This allows the preset channel to be received.

Channel to scan is preset key 51
After the preset channel 53, the preset channel 51 is returned to.

During this autoscan, the state of the key operation, in this example the preset key, is checked, and the above-described scan operation is repeated until the key operation is confirmed (step 69).

However, if the preset key is pressed during this autoscan, the channel being received at the time of the press is fixed, and the autoscan mode display is turned off (step 70).

Now, when a key other than the preset key 51 described above is pressed, the following processing is performed regardless of the operating time.

When the preset key 52 is operated, the preset channel is read and received (steps 71 and 72).

When the preset key 53 is pressed, the corresponding preset channel is read out and that channel is received (step 73,
74).

When a key other than the preset keys 51 to 53 is pressed, the following operation occurs.

At step 75, a check is made to see if the memory key 54 has been operated, and when it is pressed, channel preset processing is executed (step 80).
A specific example of the preset processing will be described later.

Also, in step 76, the up key 56 is determined, and when this is pressed, the automatic tuning mode is set in which the sweep frequency moves to the higher frequency side, and when the down key 55 is pressed, this is detected in step 77, and the Sometimes, an automatic tuning mode is entered in which the sweep frequency moves to the lower frequency side (steps 90 and 100).

In this automatic tuning mode, if a broadcasting station is present, the mode is stopped.

FIG. 3 is a flowchart showing an example of preset processing, and when the mode is shifted to, a display indicating that preset processing is being performed (for example, MEMO) is displayed.
At the same time, the operated preset key is read (steps 81 and 82). If the key is preset key 51, the previously selected reception frequency is stored at the address associated with preset key 51 (step 84).

Thereafter, by using the preset keys operated in the same manner, the selected frequency is stored at the corresponding address (steps 85 to 88).

When all preset processing is completed, the display indicating preset processing is turned off (step 89).

FIG. 4 is a flowchart showing an example of automatic channel selection processing when the up key 56 is operated.

When the UP key 56 is operated, the muting circuit 5 receives a command from the microcomputer 30.
is turned on, the frequency is raised higher than the currently received frequency by the inter-office frequency, and the state of the UP key 56 is read (step
92, 93).

In this frequency sweep state, whether or not the up key 56 or the down key 55 is operated is checked, and if the up key 56 or the down key 55 is not operated, the signal detector 40
The IF signal from is checked (step 94,
95).

When the level of this IF signal is below a predetermined level, the frequency sweep continues, and when it is recognized as being above the predetermined level, it is determined that there is a broadcasting station on that frequency, and the frequency sweep is stopped. The muting circuit 5 is turned off via the computer 30 (steps 96 and 97).

In addition, before the broadcasting station is selected, press the UP key 5.
6 or the down key 55, the program is forced to stop regardless of whether or not a broadcasting station is selected (steps 94 and 97).

The automatic channel selection process using the down key 55 is the same as that using the up key 56, so a description thereof will be omitted.

Although the above description shows the case where three preset keys are provided, this is only for convenience of explanation, and usually five or more are provided.

Moreover, since the auto-scan mode of the preset channel can be entered by means of a process other than a specific key operation, the above-described auto-scan mode process is merely one example.

[Effects of the Invention] As explained above, according to the configuration of this invention, an auto-scan function of preset channels can be added without increasing the number of function keys.

Therefore, this invention has the practical benefit of realizing the auto-scan function without increasing costs and without sacrificing the operability of the keys.

[Brief explanation of the drawing]

FIG. 1 is a system diagram of the main parts showing an example of a receiver having a synthesizer tuner according to this invention, and FIG.
4 to 4 are control flowcharts for explaining the auto scan mode processing of preset channels, and FIG. 5 is a diagram showing the key arrangement on the operation panel. 2...Mixer, 3...Intermediate frequency amplification circuit, 4...
...FM detector, 10...FM receiver, 20...Synthesizer tuner, 30...Microcomputer, 40...Signal detector, 50...Operation panel, 51-53...Preset key, 54...Memory key .

Claims (1)

[Claims for Utility Model Registration] A plurality of preset keys for presetting a plurality of channels and an up and down key for raising and lowering channels one step at a time are provided, and if the up and down keys are pressed for a predetermined period of time or more. In a receiver equipped with a synthesizer tuner that sometimes enters auto-scan mode, if any one of the plurality of preset keys described above is pressed for a predetermined period of time or longer, the preset channels will be auto-scanned. A receiver having a synthesizer tuner characterized by: