JPH04314218A - Diversity mount network follow radio receiver - Google Patents

Abstract

PURPOSE:To attain both diversity and network follow functions by detecting a multi-path level or an electric field strength so as to select any of two tuners. CONSTITUTION:A voice comparator section 5 compares contents of both tuners 1,2 while one reception frequency is fixed and the other frequency is changed, and a tuner receiving a larger electric field strength is selected by a switch 4 at different reception frequencies while the content of the voice is coincident, and a switch section 6 selects the comparator section 5 alternatively to activate the network follow function and to stop the diversity function. Conversely, while the diversity function is active, the network follow function is stopped. Thus, both the functions are available by using the two tuners in this way.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is a radio that is mounted on a mobile body and has a diversity function of reproducing the output of the received signal with less multipath using two antennas. The present invention relates to a radio having a network follow function that receives different signals using two tuners and reproduces output with a large electric field strength.

In particular, the present invention includes two tuners,
The purpose of this invention is to simultaneously perform network follow operation and diversity operation in a radio that has both diversity and network follow functions.

0003

2. Description of the Related Art FIG. 8 is a diagram showing a conventional diversity radio. Note that similar components are represented by the same reference numbers or symbols throughout the drawings. The configuration in this figure includes detecting the multipath level of the first tuner 1 and second tuner 2 that tune to the same station, and the first tuner 1 and the second tuner 2 that tune to the same station. and the diversity section 3 to be compared, and the two tuners (1,
Among 2), based on the detection results of the diversity section 3,
A switch section 4 that selectively selects one with a low multipath level; and a diversity control section 202 that selects the same station on the first tuner 1 and the second tuner 2.
an audio amplifier 102 that amplifies the output of one of the first and second tuners (1, 2) selected by the switch 4; a speaker 103 that reproduces the output of the audio amplifier 102 as sound; 1st and 2nd
antennas 9 respectively connected to tuners (1, 2) of
and 10. The configuration of the diversity section 3 will be explained in the embodiment section.

[0004] According to the present diversity section 3, distortion that occurs in the demodulated output by receiving radio waves that are a direct wave arriving from a transmitting antenna plus reflected waves from mountains, buildings, etc., that is, distortion caused by multipath, is eliminated. The sound quality is improved by detecting this and reproducing the demodulated output of the two antennas and tuner, whichever has less distortion.

FIG. 9 is a diagram showing a conventional radio equipped with network follow. The components in this diagram that are different from those in FIG. 7 are a voice comparison section 5 and a network follow control section 2.
It is 01. The audio comparison unit 5 compares the audio contents of the first tuner 1 and the second tuner 2, and if the audio contents match, it compares which of the two has a stronger electric field strength. The configuration of the audio comparison section 5 will be explained in the embodiment section. For example, in the Osaka area, the network follow control unit 201 selects the first tuner 1 that is receiving NHK-FM Kobe 86.5MHz using the switch unit 4, and causes it to be played through the audio amplifier 102 and the speaker 103. when the other second tuner 2
When a voice comparison match signal is received from the voice comparison section 5, the reception frequency is fixed at that reception frequency. In this case, the fixed receiving frequency is NHK-FM Osaka 88.1 MHz. If the audio comparison unit 5 determines that the electric field strength of the first tuner 1 is greater than that of the second tuner 2, the network follow control unit 201 changes the connection state of the switch unit 4 to the current first tuner side. When the electric field strength becomes the opposite of the above, the connection state of the switch section 4 is switched from the first tuner to the second tuner 2. In this way, the network follow function automatically follows the location of a mobile object to a frequency where broadcasts with the same content but different frequencies depending on the region can be better heard.

[0006]

[Problems to be Solved by the Invention] However, although there are conventional radios that have a diversity function and a network follow function, there is no radio that has both functions. Therefore, there is a need to provide a radio that has both a diversity function and a network follow function. This request has the problem that if you simply combine Figures 7 and 8 to make a radio with both functions, the number of tuners will be too large. When this occurs, the diversity function is activated and the tuner is switched, causing the problem that the network follow function no longer works.

Therefore, in view of the above problems, it is an object of the present invention to provide a diversity-equipped network follow radio that can effectively utilize a tuner.

[0008]

[Means for Solving the Problems] FIG. 1 is a diagram showing the basic configuration of the present invention. In order to solve the above-mentioned problems, the present invention provides a diversity-equipped radio with an audio comparison section 5, a switch section 6, a network follow diversity 7, and an antenna switching circuit 8. The audio comparison unit 5 fixes the reception frequency of one of the first tuner 1 and the second tuner 2, changes the frequency of the other, compares the audio contents of both, and when the audio contents match, the electric field is The switch section 4 selects the tuner with greater strength. The switch section 6 includes the audio comparison section 5 and the two tuner diversity section 3.
The switch 4 is changed over according to the selected one.

[0009] When the audio comparator 5 is selected by the switch unit 6, the network follow diversity 7 detects a multipath that enters the tuner selected by the audio comparator 5. Antenna switching circuit 8 switches and connects antenna 9 and antenna 10 connected to first tuner 1 and second tuner 2, respectively, when multipath is detected in diversity 7 during network follow.

0010

[Operation] In FIG. 1, according to the diversity-equipped network follow radio of the present invention, the reception frequency of one of the first tuner and the second tuner 2 used in the diversity-equipped radio is fixed by the audio comparator 5. Then, the frequency of the other one is changed, the audio contents of both are compared, and the tuner is selected by the switch 4 to the one with the larger electric field strength at the different reception frequencies of the two where the audio contents match. Section 5 is selectively selected, and the network follow function is exhibited. At this time, the diversity function will stop. Conversely, when the diversity function is active, the network follow function stops. In this way, it is possible to perform both functions simply by using two tuners. In the above case, diversity cannot be performed during network follow. Therefore, when the audio comparison unit 5 is selected by the switch unit 6, the multi-pulse entering the tuner selected by the audio comparison unit 5 is detected by the network follow diversity 7, and the multi-pulse is transmitted to the first tuner 1 and the second tuner. Antenna 9 connected to 2
and 10 are mutually switched by the antenna switching circuit 8, so that reception is possible with an antenna with fewer multipaths even during network follow.

[0011]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 2 is a diagram showing a diversity-equipped network follow radio according to an embodiment of the present invention, and the configuration of this diagram will be explained. The diversity-equipped network follow radio of this figure includes a first tuner 1 and a second tuner 2. The first tuner 1 and the second tuner 2 include a high frequency amplifier circuit AF and a mixing circuit MIX, respectively.
, front end section F/E with local oscillation circuit VCO
11 and 21, IF detection units 12 and 22 that detect intermediate frequency signals of F/Es 11 and 21, low pass filters LPFs 14 and 24 that control local oscillation circuits VCO of F/Es 11 and 21, and F/Es 11 and 21. Local oscillation circuit VCO/LPF 14 and 24
The main part PLL 1 consists of a crystal oscillator, a phase comparator, and a frequency divider (not shown) and constitutes a phase-locked loop.
3 and 23 included.

The radio according to this embodiment further includes a two-tuner diversity section 3 connected to the IF detection sections 12 and 22. 2 tuner diversity section 3 is IF detection section 1
Multipath detection units 31 and 33 extract high frequency components included in the output signals of 2 and 22, detect multipaths, and average them;
It includes a level comparison section 32 that compares two multipath levels.

Furthermore, the radio according to this embodiment includes a switch for selecting the output signal of either the IF detection section 12 or 22 having the smaller multipath level based on the output signal of the level comparison section 32 of the two-tuner diversity section 3. Contains part 4. The radio according to this embodiment includes an audio comparison section 5, and the audio comparison section 5 includes a content comparison section 51 connected to the IF detection sections 12 and 22, and an S level related to the field strength of radio waves from the middle stage of the F/Es 11 and 21. A gate that allows the output signal of the level comparison section 52 to pass through when the audio contents match between the level comparison section 52 into which the signal is input and the content comparison section 51, and causes the switch 4 to be switched to the side with the larger electric field strength based on this output signal. circuit 53.

Here, the content comparison section 51 passes through the difference between the output signals of the IF detectors 12 and 23, rectifies and averages them, and when the average level becomes below a certain value, the output signals of the IF detectors 12 and 23 are output.
It may be determined that the output signals of the two match. In addition, only the positive signals of the analog output signals of IF detection 12 and 23 are shaped into a rectangular wave with a constant amplitude, and then passed through the level difference between the two, and when the level difference becomes less than a certain value, the contents of the two are considered to match. It may be something that does.

Furthermore, the radio according to this embodiment selectively selects the outputs of the level comparison section 32 of the two-tuner diversity section 3 and the gate circuit 53 of the audio comparison section 5, and uses the selected signal to operate the switch 4 section. It includes a switch section 6 for switching. The radio according to this embodiment includes a network follow diversity 7 that detects multipaths entering the tuner selected by the audio comparing unit 5 when the audio comparing unit 5 is selected by the switching unit 6.

FIG. 3 is a diagram showing the structure of diversity during network follow in FIG. 2. As shown in the figure, its configuration is that it is connected to the output of the level comparison section 32 of the two-tuner diversity 3 and to the output of the switch 6, and is connected to the radio control microprocessor 200, which will be described later.
A gate circuit 71 that is opened and closed by the control signal of the instruction section 203, and a matching circuit that is connected to the output of the gate circuit 71 and that inputs these two output signals.
circuit 72, and A which inverts and inputs the two output signals.
It consists of an ND circuit 73 and an OR circuit 74 connected to the outputs of the AND circuits 72 and 73.

The radio according to this embodiment mutually connects antennas 9 and 10, which will be described later, connected to the first tuner 1 and the second tuner 2, respectively, when multipath is detected in the network follow diversity 7. The antenna switching circuit 8 includes an antenna switching circuit 8 for switching connection to the antenna. FIG. 4 is a diagram showing the antenna switching circuit of FIG. 2. As shown in this figure, its configuration uses the output of the OR circuit 74 of the diversity 7 at the time of network follow as a control signal, and
It consists of switches 81 and 82 that interlock and mutually switch the signals of antennas 9 and 10 to F/Es 11 and 12 of first tuner 1 and second tuner 2.

FIG. 5 is a diagram showing the configuration of the radio control microprocessor shown in FIG. 2. The radio according to this embodiment provides a frequency division ratio to the PLLs 13 and 23 to select a broadcast station, and provides a signal for controlling the switching of the switch unit 6 and the opening/closing of the diversity gate circuit 71 during network follow. Includes a control microprocessor 200. The radio control microprocessor 200 externally or by a program instructs the switch section 6 to select the diversity function and the network follow function and selects the diversity function using the instruction section 203 that instructs the opening/closing of the gate circuit 71 and the instruction section 31. When selecting the network follow function, connect the diversity control unit 202 to the PLLs 13 and 23, and when selecting the network follow function, connect the diversity control unit 202 to the PLLs 13 and 23.
01 to PLLs 13 and 23.

Returning to FIG. 2, the configuration of this embodiment includes antennas 9 and 10 that are mutually switched and connected to the first tuner 1 and the second tuner 2 by an antenna switching circuit 8, and an antenna that is connected to the output of the switch section 4. A noise blanker 100 is connected to remove pulse noise, for example, and a stereo demodulator 101 is connected to the noise blanker 100.
, an audio amplifier 102 following this, and a speaker 103 for reproducing sound.

FIG. 6 is a time chart explaining the operation of this embodiment. The instruction unit 203 of the radio control microprocessor 200 outputs, for example, "L (Low)" when performing diversity control as shown in FIG.
When controlling signals and network follow, “H”
igh)” signal.As shown in this figure (b),
The switch 6 receives the control signal from the instruction unit 203 and changes to “L”.
” signal to 2 tuner diversity 3, “H”
In the case of a signal, it is switched to the audio comparison section 5. Similarly, as shown in this figure (c), the gate circuit 71
The "L" signal turns it into the OFF state, and the "H" signal turns it into the ON state. First, when the output signal of the instruction section 203 is an "L" signal, as shown in FIG. As shown in the figure (f), the first tuner 2 is connected to the reproduction system after the noise blanker 100 by the switch 4 alternately, and if multipath occurs in the first tuner 1, the second tuner 2 is connected to the reproduction system after the noise blanker 100. Connect it to the playback system. In this case, in the diversity 7 during network follow, the gate 71 is OFF and its input signal is, for example, an "L" signal, and the OR circuit 74 inputs an "H" signal as shown in FIG. The switching circuit 8 connects the antennas 9 and 10 to the first tuner 1 and the second tuner 2, respectively, as shown in FIGS. (h) and (i).

When the output signal of the instruction section 203 becomes an "H" signal as shown in FIG. It becomes ON state. The switch section 6 uses the signal from the audio comparison section 5 to switch the switch section 4.
switch. When the level comparator 52 of the audio comparator 5 determines that the electric field strength of the first tuner 1 is stronger, for example, the switch 4 is set to the first tuner 1 side as shown in FIG. In this state, 2 tuner diversity 3
Accordingly, it is determined that the multipath level of the second tuner 1 is high as shown in FIG. 3(e). Since "H" signals are input to both diversity devices 7 during network follow, the OR circuit 74 outputs "H" signals, and the antennas 9 and 10 are connected to the first tuner 1 and the first tuner 10 through the antenna switching circuit 8, respectively. 2 tuner 2. When it is determined that the multipath level of the first tuner 2 is high due to the two-tuner diversity, the level comparison unit 3
2 outputs an "L" signal, the OR circuit 74 outputs an "L" signal, and the switch section 81 of the antenna switching circuit 8
and 82 to connect the antennas 9 and 10 to the second tuner 2 and the first tuner 1. Similarly, as shown in FIG. 3(c), when the switch unit 4 is switched to the second tuner 2 by the audio comparison unit 5, if the multipath level of the first tuner 1 increases, the OR circuit 74 is in the state of outputting an “H” signal,
Furthermore, when the multipath level of the second tuner 2 increases, the OR circuit 74 is in a state of outputting an "L" signal. In this way, reception is possible at the lower multipath level during network follow.

Next, a series of operations of this embodiment will be explained. FIG. 7 is a flowchart illustrating a series of operations according to the embodiment of the present invention. As shown in this figure, when the diversity control section 202 is selected by the instruction section 203 of the radio control microprocessor 200 (step 1), the switch section 6 is switched to the output side of the level comparison section 32 of the diversity section 3 ( Step 2). At the same time, the radio control microprocessor 200
The switch unit 204 is the diversity control unit 202
to the PLLs 13 and 23 with the same frequency division ratio T. B is transmitted and a desired broadcasting station is selected (step 3). The multipath levels of the multipath detection units 31 and 33 in FIG. 2 are respectively L31 and L32,
If L31<L32 (step 4) level comparison section 32
is switched to the first tuner 1 of the switch unit 4 via the switch unit 6 (step 5), and returns to step 4 via step 7. If L31≧L32 in step 4, the level comparison unit 32 switches the switch unit 4 to the second tuner 2 via the switch unit 6 (step 6). In this way, steps 4 to 7 are repeated.

Next, when the network follow control section 201 is selected by the instruction section 203 of the radio control microprocessor 200, the switch section 6 is switched to the output side of the gate circuit 53 of the audio comparison section 5 (step 8). At the same time, the switch 204 of the radio control microprocessor 200 is switched to the network follow control section 201 side, and P
Frequency division ratio T. to LL 13 and 23. B is sent out (step 9). At this time, the switch section 4 is connected to the first tuner 2.
The network follow control unit 201 is located on the PL side.
Frequency division ratio T. of the desired broadcasting station to L13. When supplying B, the network follow control unit 201 outputs PLL 2
The frequency division ratio supplied to 3 is changed. The content comparison unit 51 of the audio comparison unit 5 checks the consistency of the content for each frequency division ratio that changes, and if they do not match, closes the gate circuit 53,
If they match, the gate circuit 53 is opened. At this time, F/
The electric field intensities L51 and L52 from E11 and E21 are compared by the level comparison unit 52, and if the electric field intensity of the first tuner 1 is higher than that of the second tuner 2 (L51>L62) (step 10), the switch 4 is is the first tuner 1
side (step 11). When the multipath level on the first tuner 1 side becomes high (step 12), switch the antenna (step 1).
3) If the multipath level on the second tuner 1 side is high in step 12, proceed to step 1 without switching the antenna.
4 and return to step 10.

If L51≦L52 in step 10, the level comparison section 52 switches the switch 4 to the second tuner 2 side via the gate circuit 53 and the switch section 6 (step 15). Thereafter, the same procedure as above is repeated.

[0025]

[Effects of the Invention] As explained above, according to the present invention, two
The two tuners are equipped with diversity control that detects the multipath level and switches the tuner, and network follow control that detects the field strength of broadcasts with the same content or different receiving frequencies and switches the tuner, so that the tuner can be switched alternately. The diversity function and network follow function can be achieved while suppressing the increase in the number of tuners.

Furthermore, diversity control can also be performed by switching antennas during network follow control operation.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle configuration of the present invention.

FIG. 2 is a diagram illustrating a diversity-equipped network follow radio according to an embodiment of the present invention.

FIG. 3 is a diagram showing a diversity configuration during network follow in FIG. 2;

FIG. 4 is a diagram showing the antenna switching circuit of FIG. 2;

FIG. 5 is a diagram showing the configuration of a radio control microprocessor.

FIG. 6 is a time chart explaining the operation of this embodiment.

FIG. 7 is a flowchart illustrating a series of operations according to the embodiment of the present invention.

FIG. 8 is a diagram showing a conventional diversity-equipped radio.

FIG. 9 is a diagram showing a conventional network follow-equipped radio.

[Explanation of symbols]

1...First tuner 2...Second tuner 3...2 tuner diversity 4...Switch section 5...Audio comparison section 6...Switch section 7...Diversity during network follow 8...Antenna switching circuit 9, 10...Antenna

Claims (1)

[Claims] [Claim 1] A first tuner (1) that performs tuning tuning.
, the second tuner (2), and the first tuner (2) that is tuned to the same station.
a two-tuner diversity unit (3) that detects and compares the multipath levels of the tuner (1) and the second tuner (2); In the diversity-equipped radio having a switch unit (4) for selectively selecting a smaller one, one of the first tuner (1) and the second tuner (2) fixes the reception frequency, and the other one fixes the receiving frequency. an audio comparison section (5) which compares the audio content of both by changing the audio content, and selects a tuner with a larger electric field strength using the switch section (4) when the audio content matches; 5) and the two tuner diversity section (3)
and a switch section (6) that selectively switches the switch (4) depending on the selected one; and when the audio comparison section (5) is selected by the switch section (6), Diversity during network follow (7) in which the comparator (5) detects multipath entering the selected tuner, and Diversity during network follow (7) when multipath is detected in the first tuner (1) and Diversity during network follow (7). A network follow radio equipped with diversity, comprising an antenna switching circuit (8) for mutually switching and connecting an antenna (9) and an antenna (10) respectively connected to a second tuner (2).