JPH0677776A - Automatic preset device - Google Patents

Abstract

PURPOSE:To attain the operation of automatic preset without disturbing reception of a broadcast by allowing a 2nd tuner section to receive a program for a preset memory while a 1st tuner section receives a program of a broadcast station. CONSTITUTION:A system controller 19 fetches list information from an area of a 1st memory 20 and a 2nd memory 21 respectively. Only frequency data of a broadcast station corresponding to each list information are stored while being rewritten in the order of higher reception electric field strength or of high reception quality by automatic scanning. Furthermore, FM tuner sections A, B are controlled by the controller 19. Moreover, while the tuner section A is in the normal reception operation, the tuner section B implements the reception for seeking a broadcast station. Since the program for a preset memory corresponding only to list information stored in advance is received, the time for receiving the electric field strength and the reception quality over the entire broadcast frequencies is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an auto preset device having both a network follow function and an auto preset function.

[0002]

2. Description of the Related Art In a tuner capable of preset channel selection, a received signal is detected in advance by using a receiving station search function by frequency sweeping such as scanning or seeking, and when the signal level exceeds a predetermined value, sweeping is performed. There is an auto preset function of temporarily stopping, storing frequency data corresponding to the reception frequency at that time in a memory, starting sweeping again, and detecting a reception signal.

When storing frequency data corresponding to the reception frequency, the memory has a limited capacity.
Some have a function of presetting in descending order of electric field strength (or in descending order of reception quality) over the entire broadcast frequency band.

That is, conventionally, as shown in FIG. 1, when the auto preset operation is started (step 10
1) The electric field intensity detection operation is performed in a state where the audio signal of the program currently being received is muted (steps 102 to 105). The detection of the electric field strength is performed over the entire band of the broadcast frequency, and when the stations matched with the memory capacity are selected in the order of the larger electric field strength, the preset memory stores the frequency data of the stations in the order of the larger electric field strength ( Steps 106-109). When the storage of the frequency data in the preset memory is completed, the mute is released (step 110).

Further, some vehicle-mounted tuners and the like have an identical program identifying function for identifying the identity of a program by comparing the demodulated outputs of a pair of tuner sections, for example. By providing the same program identification function, it is possible to continuously listen to the same program even during mobile reception and when the reception frequency changes (network follow function).

[0006]

As described above, since the conventional tuner described above is provided with the auto preset function or the same program identification function, the operability of the tuner is further improved and the atmosphere in the vehicle is further improved. It is excited.

However, in the above-described auto preset function, when the frequency data corresponding to the reception frequency is stored, the limit capacity of the memory is taken into consideration, and in order to eliminate the preset leakage of the broadcasting station having a large electric field strength, the entire band of the broadcasting frequency is The electric field strength or the reception quality is detected through. For this reason, the time required to detect the electric field strength or the reception quality over the entire broadcast frequency band is required, and the time required until the storage of the frequency data corresponding to the reception frequency is completed is prolonged. There is.

Further, in such an auto preset function, since there is only one tuner, there is a problem that radio broadcast cannot be heard until the auto preset is completed.

The present invention has been made in consideration of such circumstances, and by combining the same program identification function and the auto preset function, the reception of radio broadcast is not hindered and the auto preset is completed. It is an object of the present invention to provide an auto presetting device capable of shortening the required time.

[0010]

SUMMARY OF THE INVENTION The present invention provides a first and second tuners for receiving a program of a broadcasting station in an auto preset apparatus having a same program identifying function and performing a network follow (same program following) operation. Department,
The same program identifying means for identifying the sameness with the program currently being received by the first and second tuner units, and the first list capable of writing list information composed of frequency data of a broadcasting station broadcasting the same program. It is characterized by comprising a storage means and a second storage means capable of writing list information composed of frequency data of a broadcasting station broadcasting a different program.

Further, according to the present invention, the list information stored in the first and second storage means is rearranged in a descending order of received signal level, in descending order of received signal level, in descending order of receiving quality, or in undesired order. It is characterized in that information changing means is provided.

[0012]

In the automatic presetting apparatus of the present invention, while the program of the broadcasting station is being received by the first tuner section, the second tuner section receives the program for the preset memory.

Further, during the network follow operation, the same program list is stored in the first storage means and the different program list is stored in the second storage means. In the second storage means or in the first
And the list information in the second storage means are sequentially received and rearranged in a predetermined order.

Therefore, the list information can be rearranged in the descending order of the received signal level or in the descending order of the received signal level, or in the descending order of the receiving quality or in the undesired order.

Further, in the automatic preset operation, the program reception for the preset memory only needs to correspond to the list information stored in advance, so that the electric field strength or the reception quality over the entire band of the broadcast frequency can be detected. The time required is shortened, and the time required until the storage of the frequency data corresponding to the reception frequency is completed is shortened.

[0016]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 2 shows a radio receiver according to the auto preset device of the present invention, which is provided with a pair of FM tuner units A and B.

In the FM tuner units A and B, noise components are removed by the filters 5 and 6 after the FM radio waves taken in from the antenna 22 are set to the intermediate frequency IF tuned by the front end units 1 and 2. To be done.
The intermediate frequency IF that has passed through the filters 5 and 6 is amplified by the IF amplifiers 9 and 10, further demodulated by the detectors 13 and 14, and then output as L and R signals by the MPX unit 17.

The demodulated outputs of the detectors 13 and 14 are taken into the same program identifying circuit 18. Same program identification circuit 18
When the same program is identified by, as described above, the demodulated outputs of the pair of FM tuner units A and B are used,
It is performed by various methods such as a zero cross count method and a non-modulation method.

Tuning control and the like in each of the front end units 1 and 2 are performed by a control signal from the system controller 19. In addition, F in the MPX unit 17
The output operation of the L and R signals of the M tuner unit A or B is also controlled by the control signal from the system controller 19.

The first memory 20 and the second memory 21 are provided with a list area of the same network and a list area of a different network, respectively. In each list area, frequency data of broadcasting stations to be preset at the time of network follow operation is written. It should be noted that these frequency data can be rewritten arbitrarily.

At the time of auto preset, the system controller 19 fetches the list information from the areas of the respective first memory 20 and the second memory 21, and only the frequency data of the broadcasting stations corresponding to the respective list information are automatically scanned. Are stored by rewriting the list information in descending order of the received electric field strength or in descending order of receiving quality. The storage order of these corresponds to a preset switch (not shown).

The FM tuner units A and B are controlled by the system controller 19. Furthermore,
While the FM tuner unit A is performing a normal receiving operation, the other FM tuner unit B is performing a receiving operation for seeking the broadcasting station.

Next, the operation of the auto presetting device having such a configuration will be described with reference to FIG.

First, as described above, the first memory 20
And / or the list information of the same network and / or the list information of a different network is written in the list area of the second memory 21 during the network follow operation. When the FM broadcast reception is selected, the FM tuner unit A performs the receiving operation, and the FM tuner unit B performs the receiving operation for seeking the broadcasting station.

When an auto preset start switch (not shown) is operated (step 301), the system controller 19 takes in list information stored in advance from the areas of the first memory 20 and the second memory 21 (step). 302).

At this time, the front end section 2 of the FM tuner section B performs a seek operation based on the list information (step 303).

If it is determined that there is no station in the tuned list information (step 304), the station of the next list information is received (step 310).

On the other hand, when it is determined that there is a station (step 304), data indicating the degree of the received electric field strength or the reception quality is stored (step 305).

In this way, when the seek operation for all list information is completed (step 306), the first
The list information in the memory 20 and / or the second memory 21 is rearranged in descending order of received field strength or in good receiving quality (step 307).

Thus, in this embodiment, for example, FM
While the tuner unit A is receiving the broadcast program, the FM tuner unit B receives the program for the preset memory. Therefore, the program reception for the preset memory is performed without hindering the reception of the radio broadcast. be able to.

When performing the auto preset operation, only the list information including the frequency data of the broadcasting station to be preset is written in advance in the respective list areas of the first memory 20 and the second memory 21. , In the preset operation, the seek operation of the broadcasting station frequency is performed based on the list information, and the same program and / or
Alternatively, since the first memory 20 and the second memory 21 are rearranged for each different program in the descending order of the electric field strength or in the descending order of receiving quality, all broadcasting frequencies are changed as in the conventional case. The seek operation for the band becomes unnecessary, and the time for performing auto preset is shortened.

In the above embodiments, the auto presetting apparatus of the present invention is used to receive FM broadcasts.
Although the tuner has been described, the present invention is not limited to this example and may be applied to an AM tuner for receiving an AM broadcast.

[0033]

As described above, according to the auto-preset device of the present invention, while the program of the broadcasting station is being received by the first tuner section, the program for the preset memory is set by the second tuner section. Reception is performed.

Further, the program identifying means stores the list information in the first memory when the programs are the same program, and stores the list information in the second memory when the programs are not the same program.

Therefore, during the auto preset operation,
The list information in the first and / or the second memory can be received in order, and can be rearranged in order of high or low signal level or good or bad reception quality.

As a result, the automatic preset operation can be performed without disturbing the reception of the radio broadcast, and the program reception for the preset memory is only required to correspond to the list information stored in advance. The time required to detect the electric field strength or the reception quality over the entire band of the broadcast frequency is shortened, and the time required until the storage of the frequency data corresponding to the reception frequency is completed can be shortened.

[Brief description of drawings]

FIG. 1 is a flowchart for explaining a conventional auto preset operation.

FIG. 2 is a block diagram showing a radio receiver according to an embodiment of an auto preset device of the present invention.

FIG. 3 is a flowchart for explaining the operation of the auto presetting device in FIG.

[Explanation of symbols]

 A, B FM tuner section 1, Front end 5-8 Filter 9, 10 IF amplification section 13, 14 Detection section 17 MPX section 18 Same program identification circuit 19 System controller 20 First memory 21 Second memory

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kazuhiko Uchiyama 25 Nishimachi, Yamada, Kawagoe City, Saitama Prefecture 1 Pioneer Co., Ltd. Kawagoe Factory

Claims (2)

[Claims] 1. An auto-preset device having the same program identifying function and performing a network follow (same program following) operation, including first and second tuner units for receiving a program of a broadcasting station, and the first and second tuner units. The same program identifying means for identifying the sameness as the program currently being received by the tuner section of No. 2, and the first storing means capable of writing list information composed of frequency data of broadcasting stations broadcasting the same program; An automatic presetting device comprising: a second storage unit capable of writing list information including frequency data of a broadcasting station that broadcasts a program. 2. List information changing means for arranging the list information stored in the first and second storage means in the order of received signal level from high or low, or in order of good reception quality or in good order. The auto presetting apparatus according to claim 1, further comprising: