JP2601421Y2 - Radio receiver - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a radio receiver capable of receiving a data multiplex broadcasting system. The present invention relates to a radio receiver configured to minimize a search.

[0002]

2. Description of the Related Art Conventionally, an RDS (Radio Data System) has been used as a radio receiver capable of receiving a data multiplex broadcasting system.
There was a receiver, which operated, for example, as shown in the flowchart of FIG.

[0003] An alternative frequency (A
To explain the search operation of F), when the receiver starts operation, the S meter level of the currently receiving broadcast station is checked,
If the value Vs of the S-meter level is larger than the arbitrarily set reference level Va, the flow returns to the start because the search is unnecessary, and if the value Vs of the S-meter level is smaller than the arbitrarily set reference level Va. The flow enters the search mode (step S20).

Next, a timer for keeping the AF search interval longer than a certain time is operated, and the search is temporarily waited (step S21). AF when timer expires and search standby ends
Check the conditions for performing the search (for example, further check the S meter and search when noise occurs). If the conditions are not met, the flow returns to the start, and if the conditions are satisfied, proceed to the next flow. (Step S2
2).

[0005] A search operation is performed except for stations whose search is prohibited in the AF list (step S23), the S meter level of the search destination station is checked, and the value Vs of the S meter level is set arbitrarily. If the reference level Va is higher than the reference level Va, the flow proceeds to the next step. If the value Vs of the S meter level is lower, the flow returns to the frequency of the station before the search (step S24, step S24a). When the frequency returns to that station, the flow is repeated from step S20.

If the value of the S meter level Vs of the station searched in step S24 is larger, then the PI ((Program Identificat) of the search destination station is determined.
ION program identification) code is checked (step S25). If the same PI code is determined, the reception frequency is fixed to the station (step S25a), and the flow returns to step S20 again to check the electric field strength.

If it is not determined whether the PI codes are different, the search destination station is set to the search inhibition and the inhibition release timer is set (step S26).

Next, the count time of the prohibition release timer is checked, and when the count time ends, prohibition is released (steps S27 and S28), and the flow ends.

As described above, if it is not determined whether the PI codes are different or not, all search stations are prohibited from searching.

[0010]

However, in a conventional radio receiver, for example, an RDS receiver, a search is erroneously prohibited depending on the reception state of a search destination station, and a station which can be normally received cannot be searched. In addition, the PI code often cannot be determined due to the radio wave condition rather than the PI code being determined to be different due to an error.
Prohibiting a search with an I-code uncertain station has the disadvantage that the opposite effect of incorrectly prohibiting a search is greater than the effect of prohibiting a search.

The present invention has been made in view of the above points, and its purpose is to solve the disadvantages of the conventional example, and to clearly determine the stations to be searched and the stations not to be searched, thereby reducing waste. An object of the present invention is to provide a radio receiver which eliminates noises and neck breaks caused by a simple search operation and minimizes discomfort caused by the search operation.

[0012]

The radio receiver of the present invention can receive a radio data multiplex broadcasting system, and automatically transmits to a station having a good reception state based on an alternative frequency list in a data multiplex broadcasting system signal. When searching for an alternative frequency in a radio receiver equipped with a function of searching and switching in a desired manner, if the program identification code of the search destination station is not determined within an arbitrary time or is different from the program identification code currently being received In the case of the program identification code, if the received electric field strength of the search destination station is equal to or more than an arbitrary set value, the subsequent search operation to the alternative frequency is prohibited, and if less than the arbitrary set value, the search operation is prohibited. A search prohibition determining means that does not perform the search is provided, and the set value of the electric field strength is confirmed by the program identification code of the search destination station within an arbitrary time. If non is the one in which the different values between a case was a program identification code that is different from the program identification code of the currently received.

[0013] Further, a search prohibition canceling means for setting a timer for each of the alternative frequencies at the time from when the search operation to the alternative frequency is prohibited and for releasing the prohibition of the search operation when the timer elapses an arbitrary set time. It is provided.

Further, the timer setting time is set to a different value depending on whether the program identification code of the search destination station is not determined within an arbitrary time or when the program identification code is different from the program identification code currently being received. It is what it was.

Further, the radio receiver of the present invention can receive a radio data multiplex broadcasting system, and automatically searches for a station having a good reception condition based on an alternative frequency list in a data multiplex broadcasting system signal. In a radio receiver equipped with a switching function, when searching for an alternative frequency, if the program identification code of the search destination station is not determined within an arbitrary time, or with a program identification code different from the program identification code currently being received If there is
If the received electric field strength of the search destination station is equal to or more than an arbitrary set value, the search operation to the subsequent alternative frequency is set to the prohibited state, and if less than the arbitrary set value, the search operation is set to the prohibited state. A search inhibition canceling means for setting a timer for each alternative frequency at the time from when the search operation to the alternative frequency is inhibited and releasing the inhibition of the search operation when the timer elapses an arbitrary set time; The set time is set to a different value depending on whether the program identification code of the search destination station is not determined within an arbitrary time or when the program identification code is different from the program identification code currently being received.

[0016]

According to the present invention, a radio data multiplex broadcasting system can be received, and a function of automatically searching and switching to a station having a good reception state based on an alternative frequency list in the data multiplex broadcasting system signal is provided. When searching for an alternative frequency in a radio data system receiver
If the program identification code of the search destination station is not determined within an arbitrary time, or if it is a program identification code different from the program identification code currently being received, the reception electric field strength of the search destination station is set to an arbitrary set value. If it is above, the search operation to the subsequent alternative frequency is set to the prohibited state, and if it is less than the arbitrary set value, the search operation is not set to the prohibited state. The value of the program identification code is different between the case where the program identification code is not fixed within an arbitrary time and the case where the program identification code is different from the currently received program identification code. A timer is set to each alternative frequency at that point in time, and the prohibition of search operation is released when the timer has passed an arbitrary set time. Since the prohibition canceling means is provided, the timer setting time is set to a program identification code different from the program identification code currently received when the program identification code of the search destination station is not determined within an arbitrary time. And the stations that should not be searched are clearly distinguished, and noise and wasteful sound caused by useless search operations are eliminated, and uncomfortable reception due to search operations is eliminated. Will be able to minimize it.

[0017]

FIG. 1 shows an embodiment of a radio receiver according to the present invention.
An RDS (radio data system) receiver will be described with reference to FIG.

In the figure, 1 is a front end composed of a VC0 controlled by a tuning voltage by an RF amplifier, a tuning circuit, a mixer circuit and a PLL circuit, 2 is an intermediate frequency amplifying circuit and a detecting circuit, 3 is a noise canceller (N , C) circuit, 4 is a stereo demodulation circuit (MPX), 5
Is a volume control circuit, 6 is an audio mute circuit, 7 is a power amplifier, 8 is a radio data system (RDS) demodulation circuit, 9 is a radio data system periodic circuit, 10 is a system microcomputer, 11 is a low-pass filter,
Reference numeral 12 denotes a PLL circuit.

The configuration of the radio data system receiver includes an S-meter level voltage obtained from the intermediate frequency amplification circuit of the ordinary FM stereo receiver and the intermediate frequency amplification circuit of the detection circuit 2, and a radio data system data signal output from the detection circuit. Is applied to a radio data system demodulating circuit 8 and a radio data system synchronizing circuit 9, and the obtained data signal (RD) is input to a system microcomputer 10.

The tuning at the front end 1 is performed by a digital tuning system comprising a system microcomputer 10, a low-pass filter 11 and a PLL circuit 12, and a voltage controlled oscillator (V
C0) is performed by changing the frequency.

Further, the system microcomputer 10
Is composed of a central processing unit for performing data arithmetic processing, a ROM for storing a program to be executed, a RAM for storing data, and an input / output port, and an S meter level signal output from the intermediate frequency amplifier circuit and the detection circuit 2. SE
And a data signal RD output from the radio data system synchronization circuit 9 are supplied to an input port of a system microcomputer 10, a control signal TC for controlling a PLL circuit 12 constituting a digital tuning system, and a demodulated audio signal. The control signal MC of the audio mute circuit 6 to be muted is the system microcomputer 1
0 output port.

The receiver compares the level of the S-meter level signal SE of the received station with an arbitrarily set reference level in the system microcomputer 10 to determine the level of the S-meter level signal SE. Is smaller than the reference level, a search operation is started, and when a search destination station is received, PI (Program Identif) is received.
The identification code is checked to determine whether the PI code is fixed, the reference level is set high, the level of the S meter level signal SE is checked again, and it is determined whether or not the receiving station is set to the search inhibition setting. It has become.

Next, the operation of the receiver will be described with reference to the flowchart of FIG. Since steps S1 to S5 of the flow are the same as the operation flow of the conventional example, a description thereof will be omitted.

A search is started for stations other than the forbidden AF station, the level of the S meter level signal SE of the search destination station is checked in step S5, and if the result is smaller than the reference level value Va, the flow is the same as in the prior art before the search. (Step S8), the operation is started again from Step S1, and if it is larger than the reference level value Va, Step S6.
Move to

Next, the PI code of the search destination station is checked (step S6). If the PI code is the same, the frequency is fixed to the frequency of the receiving station (step S7), and the flow returns to step S1. If the PI code is a different PI code, the value of the reference level is raised to the value of the previous Va or the value is raised to the value of Vb, and the value is compared again with the value of the S meter level signal (step S6a). Meter level signal value V
If s is smaller, the flow shifts to step S8, returns to the reception frequency before the search, and repeats the operation from step S1.

If the PI code cannot be determined in step S6, the value of the reference level is equal to the value Vb of the reference level raised when the PI code is a different PI code, as described above. Is raised to the value of Vc and compared again with the value Vs of the S meter level signal (step S6d). As a result, if the value Vs of the S meter level signal is smaller, the flow shifts to step S8, and the operation of the same flow as described above I do.

If the value Vs of the S meter level signal is greater than the value Vb of the reference level at step S6a, the search destination station is set as search inhibition AF, and an inhibition release timer ta is set (step S6b). ). The count time of the prohibition release timer ta set in step S6b is confirmed (step S6c). If the count time of the prohibition release timer ta has expired, the search prohibition of the AF station is released and the flow ends (step S9). . If the value Vs of the S meter level signal is larger than the reference level Vc in step S6d, the search destination station is similarly set as the search inhibition AF, and further, the inhibition release timer tb is set (step S6e).

Then, the count time of the prohibition release timer tb is confirmed (step S6f). If the count time of the prohibition release timer tb has expired, the search prohibition of the AF station is released and the flow ends (step S9). . The prohibition conditions are set separately for the case where the time relationship between the times ta and tb of the prohibition release timer and the value of the reference level are changed to determine the PI code of the search destination station not to be determined or to be determined to a different PI code. This makes it possible to optimally set a prohibitive condition that is easy to make mistakes and a prohibitive condition that is difficult to make mistakes. Normally, the relationship between the times ta and tb of the prohibition release timer is defined as ta> tb.
The relationship between the reference level values Va, Vb and Vc is Vc> Vb
> Va.

As described above, the radio data system receiver of the present embodiment can receive the radio data system signal, and can substitute the alternative frequency (A) in the radio data system signal.
F) A radio data system receiver having a function of automatically searching and switching to a station having a good reception state based on a list, and when searching for an alternative frequency, a PI (Program Identifier) of a search destination station is used.
If the program identification) code is not determined within an arbitrary time, or if a P code different from the PI code currently being received is used.
In the case of the I code, if the received electric field strength of the search destination station is equal to or more than an arbitrary set value, the subsequent search operation to the alternative frequency is set to a prohibited state, and if less than the arbitrary set value, the search operation is set to a prohibited state. A search prohibition determination means
The set value of the electric field strength is determined by the case in which the PI code of the search destination station is not determined within an arbitrary time and the current reception P
The value is different depending on whether the PI code is different from the I code.

Further, a timer is set for each alternative frequency at the time when the search operation for the alternative frequency is inhibited, and a search inhibition canceling means for canceling the inhibition of the search operation when the timer elapses arbitrarily set time is provided. It is provided.

Further, the timer setting time is set to a different value depending on whether the PI code of the search destination station is not fixed within an arbitrary time or when the PI code is different from the PI code currently being received. It is.

Further, the radio data system receiver of the present embodiment can receive a radio data system signal,
A radio data system receiver having a function of automatically searching and switching to a station having a good reception state based on an alternative frequency (AF) list in a radio data system signal, wherein when searching for an alternative frequency, a search destination Station PI
If the code is not fixed within an arbitrary time, or if it is a PI code different from the PI code currently being received, if the received electric field strength of the search destination station is equal to or more than an arbitrary set value, the subsequent alternative frequency is used. Disable the search operation of
A search prohibition determining means that does not disable the search operation if the value is less than the arbitrary set value, and a timer is set for each alternative frequency at the time from when the search operation to the alternative frequency is prohibited, and the timer is set to the arbitrary set time. A search prohibition canceling means for canceling the prohibition of the search operation when the elapsed time elapses, wherein the timer setting time is different from the case where the PI code of the search destination station is not fixed within an arbitrary time and the PI code currently being received. The value is different from that of the PI code.

[0033]

[Effect of the invention] According to the radio receiver according to the invention,
The configuration as described above has the following effects. Prohibition conditions when the program identification code of the search destination station is not determined and when the program identification code is determined to be different can be separately set, and the prohibition condition that is easy to make mistakes and the prohibition condition that is hard to make mistakes can be set optimally. Also,
Since the return condition can also be set separately, the return condition of the prohibition condition that is easily mistaken can be made earlier. Therefore, there is an effect that it is possible to quickly move to the target station while reducing erroneous movement due to the alternative frequency search by avoiding an unnecessary prohibition state.

In addition, the present invention has an excellent feature that it can be implemented only by software without adding or changing hardware, so that implementation is easy.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of the present invention.

FIG. 2 is a block diagram illustrating a hardware configuration of a radio data system receiver.

FIG. 3 is a flowchart showing a flow of the operation of the present invention.

FIG. 4 is a flowchart showing a flow of operation of a conventional radio data system receiver.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Front end 2 Intermediate frequency amplification circuit and detection circuit 8 Radio data system demodulation circuit 9 Radio data system synchronization circuit 10 System microcomputer 11 Low-pass filter 12 PLL circuit

Claims (4)

(57) [Scope of request for utility model registration] 1. A radio receiver capable of receiving a radio data multiplex broadcasting system and having a function of automatically searching and switching to a station having a good reception state based on an alternative frequency list in a data multiplex broadcasting system signal. In the case where, when searching for an alternative frequency, the program identification code of the search destination station is not determined within an arbitrary time, or
If the program identification code is different from the program identification code currently being received, if the received field strength of the search destination station is equal to or more than an arbitrary set value, the subsequent search operation to the alternative frequency is disabled, and the arbitrary set value is set. A search inhibition determining means that does not disable the search operation if the value is less than the set value of the electric field strength, the program identification code of the search destination station is not determined within an arbitrary time; A radio receiver characterized in that the identification code and the program identification code have different values. 2. A timer is set for each alternative frequency at the time from when the search operation to the alternative frequency is prohibited,
2. The radio receiver according to claim 1, further comprising a search prohibition canceling means for canceling the prohibition of the search operation when an arbitrary set time of the timer elapses. 3. The timer set time is set to a different value depending on whether the program identification code of the search destination station is not determined within an arbitrary time or when the program identification code is different from the program identification code currently being received. 3. The radio receiver according to claim 2, wherein: 4. A radio receiver capable of receiving a radio data multiplex broadcasting system and having a function of automatically searching and switching to a station having a good reception state based on an alternative frequency list in a data multiplex broadcasting system signal. In the case where, when searching for an alternative frequency, the program identification code of the search destination station is not determined within an arbitrary time, or
If the program identification code is different from the program identification code currently being received, if the received field strength of the search destination station is equal to or more than an arbitrary set value, the subsequent search operation to the alternative frequency is disabled, and the arbitrary set value is set. A search prohibition determination means that does not disable the search operation if the value is less than one, and a timer is set for each of the alternative frequencies at the time when the search operation to the alternative frequency is prohibited, and when the timer elapses arbitrarily set time A search prohibition canceling means for canceling the prohibition of the search operation, wherein the timer setting time is set to a time when the program identification code of the search destination station is not determined within an arbitrary time, and a program different from the program identification code currently being received. A radio receiver characterized in that the value is different from that of the identification code.