JPS63260216A - Receiver with preset scan function - Google Patents

Abstract

PURPOSE:To avoid the inconvenience in the case of listening by adopting the constitution such that the setting of the receiving state is canceled when a preset frequency having no corresponding sender station is scanned so as to realize efficient preset scanning. CONSTITUTION:A microcomputer 5 in a receiver with preset scan function outputs control signals C1-C3 based on a key input from a key input section 4 and a program to execute the function of the receiver. A PLL circuit 3, based on a signal C1, supplies a DC control voltage to a front end 2, sets a local oscillation frequency and supplies the signal to the front end 2. The front end 2 selects and amplifies a specific frequency component from the signal acquired by an antenna 1 and generates an intermediate frequency based on the local oscillation signal. The signal is outputted as an audio signal via an intermediate frequency amplifier circuit 7 and a detection circuit 8, the level is adjusted by an electronic volume 9 based on the signal C2 and outputted through a low frequency amplifier circuit 12 and a speaker 13. A display section 6 displays the frequency in the receiving state at present based on the signal C3.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a receiver with a preset scan function, and more particularly, the present invention relates to a receiver with a preset scan function, and more specifically, a receiver with a preset scan function.
The present invention relates to a receiver having a function of sequentially calling a preset frequency (referred to as a preset frequency) and setting a receiving state for a certain period of time based on the calling.

[Conventional technology]

The preset scan function mentioned above, unlike continuous tuning adjustment using knobs, automatically scans multiple preset frequencies and allows you to listen to the content corresponding to the scanned preset frequency for a fixed period of time. This is a feature that is included in many modern audio devices for convenience.

In conventional receivers with preset scan function,
First, a plurality of reception frequencies (for example, every 9K) in the case of AM broadcasting) are preset in the preset memory, and the built-in controller sequentially calls these preset frequencies and sets the reception state for a certain period of time. This allows the listener to check the content corresponding to the preset frequency that is being received at regular intervals.

In other words, in the conventional preset scan method, for example, assuming that N preset frequencies are set, the following operations are performed: 1) Start a preset scan, 2) Recall the first preset frequency from memory, and 2) Recall the first preset frequency from the memory. Receive the content (for about a few seconds), ■ Recall the second preset frequency from memory, ■ Repeat the same process,
The process was carried out according to the following flow: ■ Receive the content corresponding to the Nth preset frequency (for about a few seconds), and ■ End the preset scan.

[Problem that the invention seeks to solve]

As mentioned above, preset frequencies are specified for each fixed frequency, but there may not be a transmitting station for every preset frequency, and depending on the region, there may be preset frequencies for which there is no corresponding transmitting station. . However, in the above-mentioned conventional receiver with a preset scan function, the built-in controller mechanically sequentially calls multiple preset frequencies, puts them in a reception state one after another for a fixed period of time, and selects the content corresponding to the preset frequency in the reception state. Since the control is performed so that the listener listens to the broadcast stations sequentially, if a preset frequency with no corresponding transmitting station is scanned, the listener will listen to meaningless noise.

This impairs the convenience of the listener and cannot be said to be desirable.

Further, the controller itself is not preferable from the standpoint of efficiency because it takes that much time for preset scanning, although it takes only a few seconds at a time.

The present invention was created in view of the problems in the prior art described above, and realizes efficient preset scanning.
The object of the present invention is to provide a receiver with a preset scan function that can eliminate problems during listening.

[Means for solving problems]

The problem with the above-mentioned conventional technology is that there is an input means having a plurality of keys, a memory that stores data of a plurality of preset frequencies preset based on predetermined key inputs of the input means, and a key of the input means. means for sequentially recalling data of the plurality of preset frequencies from the memory in response to an input; means for determining whether there is a transmitting station corresponding to the recalled preset frequency; and based on the result of the determining means. A means for setting the receiving state for a predetermined period of time when there is a corresponding transmitting station, and a means for setting the receiving state for a predetermined period of time when there is no corresponding transmitting station based on the result of the determining means, prohibiting the setting of the receiving state and setting the next preset frequency. The problem is solved by providing a receiver with a preset scan function, which includes a means for transitioning to a calling operation.

[For production]

According to the above-mentioned configuration, when sequentially scanning the preset frequencies, it is determined whether or not there is a corresponding transmitting station for the preset frequency, and if there is a corresponding transmitting station, the normal reception state is set. This allows the listener to check the content corresponding to the preset frequency at predetermined intervals.

However, if there is no transmitting station corresponding to the called preset frequency, setting of the reception state corresponding to the preset frequency is prohibited, and the operation shifts to the calling operation of the next preset frequency. Therefore, in this case, the problem of hearing meaningless noise is eliminated, and at the same time, the efficiency of the preset scan operation itself is increased.

〔Example〕

FIG. 1 shows in block form the configuration of a receiver with a preset scan function as an embodiment of the present invention. The example shown in FIG. 1 shows a case of a synthesizer tuner applied to an in-vehicle audio system.

In FIG. 1, 1 is an antenna, and 2 is a front end, and the front end 2 has a high frequency amplification circuit and a frequency mixing circuit (not shown).

A well-known PLL (phase-locked closed loop) circuit 3 is connected to this front end 2, and a high-frequency amplification circuit in the front end 2 receives a signal captured by the antenna 1 based on a DC control voltage from the PLL circuit 3. It has the ability to select (i.e. tune) and amplify specific frequency components. 4 is a key input section equipped with a plurality of keys, in addition to keys for performing normal functions such as operating audio equipment, a preset scan function, a preset memory function,
It is equipped with keys for performing special functions such as preset function and search function. Furthermore, 5 indicates a microcomputer (described later), and 6 indicates a display section, which in this embodiment is composed of a 4-digit, 7-segment light-emitting element (light-emitting diode,
It has a function of digitally displaying the frequency currently being received based on a control signal C3 outputted by the microcomputer 5 in response to a key input operation from the key input section 4.

The above-mentioned PLL circuit 3 generates the above-mentioned DC control voltage based on the control signal CI outputted by the microcomputer 5 in response to a key input operation from the key input section 4, and supplies it to the high-frequency amplifier circuit in the front end 2. It also has a function of setting a local oscillation frequency by changing the frequency division ratio of a built-in frequency divider (not shown), and supplying the signal to the frequency mixing circuit in the front end 2. In this frequency mixing circuit, the signal from the high frequency amplifier circuit and the PLL circuit 3
An intermediate frequency is generated based on the local oscillation signal from the oscillator, and the signal is amplified in the next stage intermediate frequency amplification circuit 7 and then input to the detection circuit 8, where the carrier component is removed and rectified to produce an audio signal. becomes.

The audio signal generated through the detection circuit 8 is input to an electronic volume 9. This electronic volume 9 responds to a control signal C2 input via the microcomputer 5 based on a key input operation from the key input unit 4.
It has the function of changing the value of the built-in variable resistor. The electronic volume 9 is connected to a car radio (output signal of the detection circuit 8), a cassette deck 10, or a CD (compact disc) player 11 selected by a switching means (not shown).
The level of one of the output signals is adjusted and transmitted to the low frequency amplifier circuit 12. The audio signal amplified by this low frequency amplification circuit 12 is converted into audible sound through a speaker 13 and is listened to.

Next, details of the microcomputer shown in FIG. 1 will be explained with reference to FIG.

The microcomputer 5 includes a main control section 51, a memory section 52, a PLL1ti control section 53, and a display control section 54. The memory unit 52 stores, in addition to programs for executing the normal functions of the apparatus, data according to the present invention, that is, a plurality of preset frequencies f based on predetermined key inputs from the key input unit 4.

Data of (i=1 to N) is stored. Specifically, in the process in which the frequency display changes sequentially for each fixed frequency on the display section 6 based on the operation of the search key, when the desired frequency is displayed, the preset memory
By operating the key and then operating the preset key, data of the relevant frequency is stored in the memory section 52 under the control of the main control section 51.

In addition to the normal PLL control via the PLLIIJ control unit 53 and the main control unit 53L circuit 3 and the normal volume adjustment function via the electronic volume 9, the main control unit 51 has an intermediate frequency control function as a function according to the present invention. It has a function of determining whether or not there is a transmitting station corresponding to the scanned preset frequency by using the function of detecting the presence or absence of a transmitting station during a search by the amplifier circuit 7.

Furthermore, the main control section 51 has a function of setting the reception state for several seconds when there is a corresponding transmitting station based on this determination result. In this case, the listener can listen to the content corresponding to the recent frequency.

On the other hand, if there is no corresponding transmitting station based on the above-described determination result, the main control unit 51 prohibits setting of the reception state, and
It has a function to move to the next preset frequency calling operation. This eliminates the problem of the listener hearing meaningless noise. Furthermore, since the time required for setting the reception state is saved, the time required for the preset scan operation is reduced accordingly.

This means that the efficiency of the preset scan operation increases.

Next, the preset scan processing according to the present invention performed by the main control section 51 shown in FIG. 2 will be explained with reference to the flowchart shown in FIG.

First, in step 31, it is determined whether the preset throat scan key has been operated from the key input unit 4 (YES) or not (NO). If the determination is NO, step 31 is repeated again, and if the determination is YES, it is determined. If so, proceed to step 32. In step 32, an initial value is set (i=1), and in the next step 33, a preset frequency f, (r+ in this case) is called from the memory section 52.

In the next step 34, it is determined whether there is a transmitting station corresponding to the preset frequency 11 (YES) or not (NO). If the determination is YES, the process proceeds to step 35, and if the determination is NO, the process proceeds to step 35. Skip to step 36. The reception status is set using the Ste/knob 35 for several seconds. During this time, the listener can confirm the content corresponding to the preset frequency through the speaker 13.

In step 36, it is determined whether the value of i is equal to the value of N (YES) or not (NO), and if the determination is YES, this flow ends, and if the determination is No, step 3
Proceed to step 7, where the value of i is updated (1=2 in this case)
Then, the process returns to step 33.

Therefore, if the determination in step 34 is NO, the process corresponding to step 35 is omitted, so the listener does not have to listen to meaningless noise, and at the same time, the time required for this process is necessary for the preset scan process. The time it takes to do this is reduced.

〔Effect of the invention〕

As explained above, according to the receiver with a preset scan function of the present invention, the reception status setting is canceled when a preset frequency with no corresponding transmitting station is scanned, so that meaningless noise is generated. This eliminates the problem of listening, and contributes to improving the efficiency of the prisé/nodoscan operation itself.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of a receiver with a preset scan function as an embodiment of the present invention, FIG. 2 is a block diagram showing an example of the configuration of the microcomputer shown in FIG. 2 is a flowchart showing processing according to the present invention of the main control unit shown in the figure. (Explanation of symbols) 4...Key input section, 5...Microcomputer, 51...Main control section, 52...Memory section, f!
...Preset frequency data. Block diagram 2I2I showing an example of the configuration of the microcomputer in FIG. 1

Claims (1)

[Scope of Claims] Input means comprising a plurality of keys; a memory storing data of a plurality of preset frequencies set in advance based on predetermined key inputs of the input means; and a memory responsive to key inputs of the input means. means for sequentially recalling data of the plurality of preset frequencies from the memory; means for determining whether or not there is a transmitting station corresponding to the recalled preset frequency; means for setting the receiving state for a predetermined period of time if there is a station, and a means for setting the receiving state for a predetermined period of time when there is no corresponding transmitting station based on the result of the determining means, prohibiting the setting of the receiving state and calling the next preset frequency. A receiver with a preset scan function, comprising a means for shifting to a preset scan function.