JPH07154209A - Receiver - Google Patents

Abstract

PURPOSE:To allow the user to listen to a broadcast station whose reception is desired with priority at all times by selecting the broadcast station so as to always receive a broadcast station of a higher rank based on the priority order. CONSTITUTION:A reception section 20 is used to receive a broadcast station actually and a reception section 30 is used to detect broadcast stations having an electric field strength over the search sensitivity in addition to the broadcast station received by the reception section 20. When the reception section 30 detects a broadcast station whose priority order is placed higher than that of the broadcast station received by the reception section 20, a microcomputer 11 selects replaces the broadcast station received by the reception section 20 with the broadcast station of the higher priority order. The priority order of the broadcast station whose reception is desired is set in this way and a. reception broadcast station selection means selects the broadcast station so as to receive the broadcast station of a higher rank at all times based on the priority order.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a receiver, and more particularly to a receiver which has a preset memory function and a search function and which is mainly used for an on-vehicle radio.

[0002]

2. Description of the Related Art Generally,
The car-mounted radio employs a reception system in which the receivable frequencies in the living area are preset in memory for several stations in advance and the broadcasting station desired to be listened to is called from the preset memory. However, it may be difficult to receive the desired broadcasting station depending on the location even in the living area. In that case, the listener, while listening to another broadcasting station that can receive for the time being,
From time to time, whether or not the desired broadcasting station is received and is ready to be received, that is, the electric field strength of the desired broadcasting station is equal to or higher than the search sensitivity (more than a level sufficient to receive and listen). I often check whether or not. At that time, the switching of the receiving broadcast station was performed manually.

As described above, in the conventional receiver, when the electric field strength of the desired broadcasting station among the broadcasting stations stored in the preset memory is less than the search sensitivity and the other broadcasting station is receiving for the time being, the desired broadcasting station is selected. In order to check the reception status of the broadcasting station (whether the electric field strength is equal to or higher than the search sensitivity), it is necessary to manually switch the broadcasting station from the other broadcasting station to the desired broadcasting station. At that time, needless to say, reception of the other broadcasting station is interrupted.

The present invention has been made in view of the above-mentioned problems, and even when another broadcast station is receiving when the electric field strength of the broadcast station desired to be received is lower than the search sensitivity, the desired broadcast station If the electric field strength of the desired broadcasting station becomes equal to or higher than the search sensitivity by continuously executing the search (detection of electric field strength), the broadcasting station to be received is selected from the other broadcasting stations. It is an object of the present invention to provide a receiver that can automatically switch to a broadcasting station.

[0005]

In order to achieve the above-mentioned object, a receiver according to the present invention is a receiver which receives a signal after frequency conversion by a local oscillator, and includes a memory switch and a memory, Among the broadcasting station determined to be receivable by the receiving level detecting means and the receiving level detecting means for detecting a broadcasting station having a certain receiving level or more, the above-mentioned priority setting means And a receiving broadcast station selecting means for receiving a broadcast station of a higher rank set by the means.

[0006]

The broadcasting stations whose priorities are set by the priority setting means are, for example, the broadcasting station A in order from the higher rank.
If the broadcasting station currently receiving the operation of the receiver according to the present invention is the B broadcasting station and the B broadcasting station is the B broadcasting station,
The case of being the C broadcasting station and the case of being the D broadcasting station (a broadcasting station that is neither A, B nor C) will be briefly described.

The electric field strength of the A broadcasting station is constantly searched by the reception level detecting means, and the electric field strength of the A broadcasting station becomes equal to or higher than the search sensitivity, so that the reception level detecting means can receive the A broadcasting station. If it is determined that there is one, the receiving broadcast station selecting means switches the receiving broadcast station from the B broadcast station to the A broadcast station.

The electric field strength of the A and B broadcasting stations is constantly searched by the reception level detecting means, and the electric field strength of the A or B broadcasting station becomes equal to or higher than the search sensitivity. When it is determined that the broadcasting station is receivable, the receiving broadcasting station selecting means switches the broadcasting station to be received from the C broadcasting station to the A or B broadcasting station. At that time, when the broadcast station is switched to the A broadcast station, only the broadcast station A receives and the search operation is not performed. However, when the broadcast station is switched to the B broadcast station, the B broadcast as described above is performed. When the station is received, the search operation of the broadcasting station A is also performed in parallel.

The reception level detection means A, B
The field strengths of stations A and C are constantly searched, and A,
When the electric field strength of either the B or C broadcasting station becomes equal to or higher than the search sensitivity and the reception level detecting means determines that the A, B or C broadcasting station is receivable, the reception broadcasting station selecting means. The receiving broadcasting station is switched from the D broadcasting station to any one of the A, B, or C broadcasting stations. In that case, when the broadcasting station is switched to the C broadcasting station, the operation described above is continuously performed, and
When the broadcasting station is switched to, the above-described operation is continuously performed, and when the broadcasting station is switched to A station, only the A broadcasting station is received and the other broadcasting stations are not searched.

As described above, in the receiver according to the present invention, the priority order setting means sets the priority order of the broadcasting station desired to be received, and based on the order, the broadcasting station of the higher rank is always received. The broadcast station is selected by the receiving broadcast station selecting means so that the above can be achieved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a receiver according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram schematically showing a receiving unit of a receiver according to an embodiment. In the figure, 11 is a microcomputer, 12 is an antenna, and 20 is a receiving P.
A receiving unit forming an LL loop, and 30 indicates a receiving unit forming a PLL loop for detecting a broadcasting station having a high priority, the microcomputer 11 and the antenna 1
2 is common to the receiving unit 20 and the receiving unit 30.

Microcomputer 11 and antenna 1
In addition to 2, the reception unit 20 includes a front end 21 and a low-pass filter 22, the reception unit 30 includes a front end 31 and a low-pass filter 32, and the antenna 12 includes the front end 21. And the front end 31.

In the receiver 20, the front end 21
Are connected to the micro computer 11, and the micro computer 11 is connected to the low-pass filter 22.
The pass filter 22 is connected to the front end 21, and the front end 21, the microcomputer 11 and the low pass filter 22 form a PLL loop in the receiving section 20. On the other hand, also in the receiving unit 30,
The front end 31 is connected to the microcomputer 11, and the microcomputer 11 is a low pass filter 3.
2, the low-pass filter 32 is connected to the front end 31, and the front-end 31, the microcomputer 11 and the low-pass filter 32 are connected to the receiving unit 3.
The PLL loop at 0 is formed.

In the above structure, the receiving section 20 is a receiving section for actually receiving the broadcasting station, and the receiving section 30 provides the electric field strength higher than the search sensitivity in addition to the broadcasting station received by the receiving section 20. It is a receiving unit for detecting a broadcasting station that it has.
In the receiver according to the embodiment, when the receiving unit 30 detects a broadcasting station having a higher priority than the broadcasting station received by the receiving unit 20, the microcomputer 1
1, the broadcasting station received by the receiving unit 20 can be switched to the broadcasting station with the higher priority. The operation of the receiver according to the embodiment will be described below with reference to the flowchart shown in FIG. FIG. 2 is a flow chart showing the operation of the microcomputer 11, and f ₁ , f ₂ and f ₃ shown in the figure represent the reception frequencies (broadcasting stations),
The order of priority is f ₁ , f ₂ , and f _{3 in} order from the top.

The microcomputer 11 first checks whether or not the receiving station 30 can receive the broadcast station f ₁ having the highest priority (step 1). If it is determined in step 1 that f ₁ is receivable, the process returns to step 1 after executing step 2. In step 2, the process of receiving the broadcasting station f ₁ in the receiving unit 20 is performed. On the other hand, when it is determined that f ₁ is not receivable, the process proceeds to step 3 and it is determined whether or not the broadcasting station f ₂ having the priority of the next rank is receivable. Step 1 to Step 2 shown above
The flow for is described below with reference to FIG.
The operations of the receiving unit 30 and the receiving unit 20 described below are the same for the flow from step 3 to step 4 and the flow from step 5 to step 6.

The microcomputer 11 includes an antenna 12
The control voltage TB (tuning bias) is applied to the front end 31 via the low-pass filter 32 so that the broadcasting station selected by the front end 31 and tuned in the front end 31 becomes f ₁ . The front end 31 receives a broadcast radio wave based on the control voltage TB, and oscillates a local oscillation frequency indicating a difference between the broadcast radio wave and the intermediate frequency IF for the purpose of lowering the received broadcast radio wave to an intermediate frequency. . The local oscillation frequency is the microcomputer 11
, The broadcast frequency f ₁ and the intermediate frequency I which are to be received by the local oscillation frequency in the microcomputer 11.
It is determined whether the difference from F is accurately indicated. If the local oscillation frequency is different from the difference between f ₁ and the intermediate frequency IF, the microcomputer 11
The local oscillation frequency input from the front end 31 to the microcomputer 11 is accurately f ₁ and the intermediate frequency IF.
The tuning bias TB is controlled so as to have a difference with Then, the microcomputer 11 determines whether the electric field strength (DC voltage of the signal level) of the broadcasting station f ₁ selected and tuned by the receiving unit 30 as described above is equal to or higher than the threshold level (more than the search sensitivity). Judge whether
If the DC voltage is equal to or higher than the search sensitivity, the broadcasting station received by the receiving unit 20 is switched to the broadcasting station f ₁ ,
The contents of ₁ are output as voice. In this case, the receiving unit 20 selects the broadcasting station f ₁ in the receiving unit 30 described above.
The same operation as in the case of tuning is performed.

In step 3, it is judged whether or not the broadcasting station f ₂ having the next priority can be received. Field strength of the broadcasting station f ₂ is Sa - received if in Ji sensitivity above, the broadcasting stations received by the receiver 20 is switched to f _2, the contents of the broadcast station f ₂ is the audio output (Step 4) . Then return to step 1. On the other hand, if the electric field strength of the broadcasting station f ₂ is equal to or lower than the search sensitivity, it is judged in step 5 whether the broadcasting station f ₃ having the lower rank priority can be received.

When it is determined in step 5 that the broadcasting station f ₃ is receivable, the receiving section 20 receives the broadcasting station f ₃ (step 6), and then the process returns to step 1. On the other hand, when it is determined that the broadcasting station f ₃ is not receivable, the receiving unit 20 receives a broadcasting station that can receive anyway regardless of the priority order. And
While continuing to receive the broadcasting station in the receiving unit 20, the process returns to step 1 to determine again whether or not the broadcasting station with the priority set cannot be received, in order from the broadcasting station f ₁ .

In the above embodiment, the PLL circuit (loop)
Although two PLL circuits are used, it is not necessary to use two PLL circuits to implement the receiver according to the present invention. For example, only one PLL circuit (loop) in the receiving unit 20 may be used. it can. The operation of the microcomputer 11 in that case is shown in the flowchart of FIG.

First, in step 1, it is judged whether or not a predetermined time has elapsed. If the predetermined time has not elapsed, the determination in step 1 is continued, and if the predetermined time has elapsed, the mute is turned on in step 2. When the mute is turned on, the audio output of the broadcasting station received by the receiving unit 20 is turned off, and the receiving unit 20 is used for the search of the broadcasting station desired to receive. Thereafter, the same processing as that of the above-described embodiment is performed.

In step 3, it is judged whether or not the broadcasting station f ₁ can be received. If the broadcasting station f ₁ can be received, the broadcasting station f ₁ is received in step 4, and then the process proceeds to step 10.
On the other hand, if it is not receivable, the process proceeds to step 5 and it is determined whether or not the broadcasting station f ₂ is receivable. In step 5, if the broadcasting station f ₂ is determined to be receivable, receives a broadcast station f ₂ at step 6, then moves to step 10. On the other hand, when the broadcasting station f ₂ is not receivable, the routine proceeds to step 7, where it is judged whether or not the broadcasting station f ₃ is receivable. In step 7,
If the broadcasting station f ₃ can be received, it receives a broadcast station f ₃ in step 8, then moves to step 10. on the other hand,
If the broadcasting station f ₃ is not receivable, the process proceeds to step 9 to restart the reception of the broadcasting station that was receiving before the muting was turned on. Then, in step 10, the mute is turned off, and the reception unit 20 continues to receive the broadcast station in step 9 for a predetermined time.

As described above, in the receiver according to the embodiment, the broadcast stations desired to be received (the broadcast stations f ₁ whose priority order is set, are received in parallel with the reception of the receivable broadcast stations). Since the search of f ₂ , f ₃ ) is executed, f ₁ ,
If the electric field strength of any one of the f ₂ and f ₃ broadcasting stations becomes equal to or higher than the search sensitivity, the broadcasting station received by the receiving unit 20 by the microcomputer 11 is automatically f ₁ , f ₂ , f ₃
It can be switched to one of the broadcasting stations. In that case, the electric field strength of a plurality of broadcasting stations among the broadcasting stations f ₁ , f ₂ , and f ₃ is measured.
If the sensitivity is equal to or higher than the sensitivity, the broadcasting station with high priority is received. Therefore, by using the receiver according to the embodiment, it is possible to always preferentially listen to the broadcasting station that desires to receive.

[0023]

As described above in detail, in the receiver according to the present invention, the priority order setting means sets the priority order of the broadcasting station desired to receive, and the broadcasting station of the higher rank is always selected based on the order. Since the broadcast station is automatically selected by the reception broadcast station selecting means so that the listener can receive the signal, the listener can always preferentially listen to the broadcast station desired to be received.

[Brief description of drawings]

FIG. 1 is a block diagram schematically showing a receiver in an embodiment of a receiver according to the present invention.

FIG. 2 is a flowchart showing the operation of the microcomputer when two PLL circuits (loops) according to the embodiment are used.

FIG. 3 is a flowchart showing the operation of the microcomputer when only one PLL circuit (loop) according to the embodiment is used.

[Explanation of symbols]

 11 Microcomputer (PLL circuit) 20, 30 Receiver (PLL circuit) 21, 31 Front end (PLL circuit) 22, 32 Low-pass filter (PLL circuit)

Claims (1)

[Claims] 1. A receiver for frequency-converting and receiving by a local oscillator, comprising a memory switch and a memory, priority setting means for setting the priority of a receiving broadcasting station, and broadcasting of a certain reception level or higher. Reception level detection means for detecting a station, and reception broadcast station selection means for receiving a higher rank broadcast station set by the priority setting means among broadcast stations determined to be receivable by the reception level detection means A receiver characterized by comprising.