JPS58151111A - Radio receiver - Google Patents

Abstract

PURPOSE:To simplify the constitution of a deciding device for the identity and to cope with a larger time difference, by deciding zero cross waves obtained from a zero cross detector with a controller directly relating to a car radio receiver. CONSTITUTION:A controller 17 checks for outputs of voltage comparators 40, 41 and starts fetching of two zero crossing waves being outputs of zero cross detectors 32, 33, after a signal having sufficient sound level (hereinafter, called ''effective''). The data fetching operation is performed for sufficient number of times for the same identity, i.e. N+x times, and the output of the voltage comparators 40, 41 is confirmed for both ''effective'' at each data fetch. When the data fatch is finished, the controller 17 clears a counter 62 at first into zero as initial value, compares data bits of the same address of data memories A60 and B61 sequentially, and adds ''1'' to the contents of the counter 62 when one is a logical value ''1'' and the other is ''0''.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention mainly relates to an automatic heavy-duty radio receiver that has 11 receiving systems for two series guns in the same broadcasting frequency band.
In particular, the present invention relates to the configuration of an identity determiner that determines whether or not audio signals from the two receiving systems are the same.

In this type of radio receiver for personal use, one receiving system receives broadcasts while the other receiving system searches for a station with a better reception condition under the control of a microcombi controller, etc. It is determined whether the broadcast contents are the same or not, and the same broadcast contents are sequentially determined. By selecting and receiving stations with better reception, even if your WJ vehicle moves beyond the service area of many broadcasting stations, you can easily receive the same broadcast program without having to bother the receiver. It is possible to continue receiving in good condition.

FIG. 1 shows an example of this type of radio receiver. In the figure,
(1) LD antenna, (2) distributor, (3) channel selection device, (4) intermediate frequency amplifier, (5) detector, (6
) is the first receiving system (hereinafter referred to as receiving system A)', (7
), the tuning device (8) increases the intermediate frequency by 111! (9) is a detector, (10) is a second receiving system (hereinafter referred to as receiving system B), (11) is an audio signal switch, (12) is a low frequency amplifier, (13) is a speaker, (14) is a first electric field detector, (15) is a second electric field detector, (16) is an identity determiner, (17) is a control device, (18) V'i frequency display, (19) Fi operation key. In the radio receiver configured as described above, the broadcast wave signal '8 induced in the antenna (1) is divided into two parts by the distributor (2), and the receiving thread A (
6) and receiving system B (10). In response to a station leaving station, only the broadcast waves of that frequency are converted into intermediate frequency signals and output. Intermediate frequency amplification! I(4) and (8) F
'iThis intermediate frequency signal is amplified and detected by detectors (5) and (9).
). Detectors (5) and (9) Detect the Fi intermediate frequency signal and output an audio signal. In this way, receiving system A
(6) and receiving system B (10), one of them is selected by an audio signal switch (11), amplified by a low frequency amplifier (12), and reproduced by a speaker (13). Electric field detectors (14) and (15) detect the reception level of each broadcasting station being received by reception system A (6) and reception system B (10), respectively, and send corresponding signals to the control device (17). identity determiner (16)
This is to determine whether or not the audio signals from the two receiving systems have the same content. The control device (17) is composed of, for example, a microcomputer and has operation keys (19).
) In addition to controlling the receiving frequency and displaying it on the frequency display (18), it also performs an automatic tuning operation to the same broadcast content station. This automatic channel selection operation is performed as follows, for example. First, a station manually operated by the listener is received by the receiving system A (6), and the audio signal switching device (11
). At this time, the control device (17) scans the reception frequency over the entire broadcast frequency band in the reception system B (10), and sends the electric field detector (14) to the reception system B (10).
From the signals in (15) and (15), the receiving system (6) searches for a station whose reception level is higher than that of the station currently being received. From this result, if there is a station with a high reception level, that is, a station with good reception conditions, it is determined using the identity determination device (16) whether or not the audio signals from the two reception systems have the same content. As a result, if it is determined that they are not the same, scanning by the reception system B (10) continues; if it is determined that they are the same, the audio signal switch (11)
) as receiving system B(10)ill, receiving system B(10
) and reproduces the output audio signal of the frequency display (1).
Let the display in 8) be the receiving frequency of receiving system E (10).

Also, the reception frequency scanning which has been performed by the reception system B (10) up to now is continued by the reception system A (6). As a result of the above operation, all stations in the broadcasting frequency band 1 with better reception conditions than the station currently being received will be tested. It will continue to be received.

Conventionally, there has been an identity determining device shown in FIG. 2 used in this type of radio receiver. In the figure (30) (
31) V'! Low range 747L/p, (32), (3
3) H-1/a9 loss detector, (42),
(43) is a shift register, (44) is a clock generator, (34), (45), and (46) tr
i exclusive OR circuit C (hereinafter referred to as fj-OR circuit), (
35), (47) and (48) are integrators, (49),
(50) #-1t combiner, (36) is the first voltage comparator, (37) d second voltage comparator, (38), (39)
)H detector, (40) and (41) are voltage comparators. Identity determination configured as above! In (16), the audio signals from receiving system A (6) and receiving system B (10) are passed through low-pass filters (30) and (3
After removing high frequency components using 1), zero cross detector (3
2), given in (33). Zero cross detector (32), (33) rfi.

It outputs a #H level or "L" level 21 signal, that is, a zero crossing wave, depending on the sign of the alternating current component of the human input signal.

1it-OR circuit (34), (45), (46
) and integrators (35), (47), (48) Fi convert the degree of coincidence of these two zero-crossing waves into a DC signal level and output it, and a shift register (42),
(43) are m-0R circuits (45) and (46), respectively.
This is to delay one of the zero-crossing waves given to the wave.

Next, first, the ll-0R circuit (34), the integrator (35)
I will talk about the previous work. The E-OR circuit (34) outputs the #L# level when the two zero-crossing waves given from the two human inputs, that is, the zero-crossing detectors (42) and (43), are both #H" or both #L#, On the other hand, “Hl”
, when the other is #L#, it outputs #H" level, and the integrator (35) integrates the -OR circuit (34) output for a predetermined period. Therefore, the identity determiner ( 1
When the two audio signals given to 6) are exactly the same: The outputs of zero cross detectors (32) and (33) simultaneously become #11# level or #IJ# level and become 1-
The output of the OR circuit (34) becomes 1L level almost continuously, and the output of the integrator (L5) also becomes approximately equal to #L level.

In addition, when the two audio signals have the same content and are in opposite phases to each other, the outputs of the zero cross detectors (32) and (33) are always at the 1H level when one is at the 1H'' level, and the other is at the I level, and the jli-OR circuit ( 34) Output is “H” almost continuously
The output level of the integrator (35) also becomes approximately equal to the #H level. Next, if the contents of the two audio @ numbers are different, the above relationship does not exist between the two outputs of the zero cross detectors (32) and (33), and if enough time is taken, #H# or mL will be output at the same time. One side is #H1
Then, the period during which the other one becomes 1L level becomes almost equal. Therefore, the output of the E-OR circuit (34) will be H# for approximately 1 of the appropriate periods, and will be H# for the remaining period.
It becomes L. Therefore, the output of the integrator (35) becomes approximately an intermediate value between the #H level and the #L level.

From this, if a sufficient integration period is taken, whether or not the two audio signal contents are the same will clearly appear as the output of the integrator (35).

Next, a case will be described in which two audio signals from receiving system M (6) and receiving system B (10) have the same content but have a time difference τ. Here, for convenience 12, the audio signal has a frequency f, a period T ('r
= 1/f), and consider the case where T>2τ.

First, when the two audio signals are in phase, the outputs of the zero cross detectors (32) and (33) will be inconsistent for two periods during the period T, so the output θO of the integrator (35) will be approximately T(7).
During the period, the period zero cross detector (32) of 2T, (
Since the outputs of 33) match, the output θOF'i of the integrator (35) is approximately ゛2r゛ .
yFH==(1-2 ft)Vu, which deviates from the ideal case with no time difference and reduces the accuracy of the determination. The OR circuits (45), (46) and the integrator (47), (48) #'i are provided to prevent the judgment accuracy from decreasing due to this time difference τ.
One of the zero-crossing waves given to the li-OR circuits (45) and (46) is delayed by a time t using shift registers (42) and (43), and then integrated as above! ! Outputs for determination are obtained in (47) and (48). Here, the delay time in the shift register mt
Let n be the # of the Fi7 register, and let the clock generator (
If the clock frequency from 44) is f(!LK), then t = n/f c L K. Also, by appropriately selecting the number of shift register stages, the tarokk frequency fOLK can be changed to the low-pass filter (30),
It is considered that by setting the cutoff frequency sufficiently higher than the cutoff frequency of (31), the two zero crossings in shift registers (42) and (43) are hardly modified and only a delay is given.

As a result, the best judgment results are obtained when the output of the integrator (47), θl, and the delay time of the integrator signal are t and −t, respectively. Figure 113 shows t=QJ3 (ms)
This is a graph showing this situation, and the frequency f is 250 [
H2] and □□□[Hz], and each integrator output eo, θl, 62 with respect to the time difference τ is shown. Furthermore, for two audio signals with different contents, no correlation is caused by giving a delay time t, so if a sufficient integration time is given, the outputs 81 and θ2 of the integrators (47) and (48) are approximately equal to vH. becomes. Therefore, in the case shown in Fig. 3, if at least 500 or more high-frequency components are sufficiently attenuated by the low-pass filters (30) and (31), each It can be seen that identity determination can be performed with high accuracy using any of the outputs of the integrators (35), (47), and (48).

Next is FR1! (49) is an integrator (35), (47)
, (48) is configured to always output the maximum value of them, and the voltage comparator (36)
The synthesizer output is the first judgment L/he eth(here(
This is to give a signal whose contents are the same when the value is larger than ``vH < e th s (value determined as appropriate in the range of VH), and a signal whose contents are mismatched otherwise. 50) is an integrator (35)
, (47), and (4B) are configured to always output the minimum value thereof, and the voltage comparator (37) is configured so that the synthesizer output is at the second judgment level ethz
(Here, if the value is smaller than 6 th 2d O (@ th 2 (an appropriately determined value within the range of 4VH)), a signal is given that the contents are the same, and in other cases, a signal is given that the content is inconsistent.

The control device (17) includes voltage comparators (36), (37)
When one of them receives an output and gives a signal with the same content, it is determined that the content is the same and operates.

Next, the detectors (38), (39) and voltage comparator C4
43), (41) are low-pass filters (30), (
31) It detects the output audio signal level and gives a signal indicating whether or not there is a sufficient audio signal level for determination, that is, an audio level determination signal, to the control device (17), and determines the sameness of the two audio signals. This makes it possible to accurately determine identity in a short time.

As described above, the conventional identity determination was mainly performed using the hardware of the identity determination device (16).

This resulted in a relatively complicated configuration including a shift register, a B-oR circuit, an integrator, etc., and it was also expensive. Furthermore, as a conventional example, a configuration including three sets of range f-OR circuits and integrators has been shown, but the time difference between the two audio signals that can be handled by this is at most i [ms] before the image, and even larger time differences can be handled. Much to deal with? shift register and -OR
It was necessary to add a circuit and an integrator pair.

The present invention has been made to eliminate the drawbacks of the conventional identity determining device, and by directly determining the zero crossing wave obtained from the zero crossing detector using a control device,
The purpose is to simplify the configuration of the identity determiner and to be able to deal with larger time differences.

FIG. 4 is a block diagram showing an embodiment of the present invention,
(6) to (41) are exactly the same as the conventional example, and (60)
is the first data memory area, i.e. data memory A
, (61) is the second data memory area, ie, data memory B, and (62) is Kakunta. In addition, (60) to (62) are all control devices (17)
It may be an area provided on a data memory or register constituting the data memory, and may be temporarily set only during the period of the identity determination operation described below.

The identity determination operation by the control device (17), for example, is performed as follows.

First, the control device (17) has voltage comparators (40) and (41
), especially if the signal indicates that the audio level is sufficiently high (
Wait until a signal (hereinafter referred to as "1 valid") is output, and then start capturing the two zero-crossing waves output from the zero-crossing detector (32) and (33). The data is sequentially stored in data memory B (61) from the zero cross detector at A (60), and the data acquisition interval is approximately constant time t8, and the sampling frequency ta=
=1/la is selected to be sufficiently higher than the cutoff frequency of the low-pass filters (30) and (31). In addition, this data import previous work was performed a sufficient number of times for identity determination, that is, N
The voltage comparator (
40) Check that the outputs of (41) are both #valid 1. If one of the outputs of the voltage comparators (40) and (41) is not "valid", it waits for both of them to become "1 valid" and starts data acquisition anew N+1 times.This causes data memory A (60) and data memory B (61) respectively store N+x [bits] of zero-crossing wave data that are continuously captured during a period when the audio signal level is sufficient.This will be explained here. For convenience, data memory A (60) and data memory 43 (61) are N+2 (pit) memories with an address for each bit, as shown in Figure 5, and the zero-crossing wave data is stored from address 1. It is assumed that the data is stored sequentially, and data taken in at the same time is stored at the same location in the two data memories.

When the above data import operation is completed, the control device (17) first clears the force sensor (62) to the initial value 0, and taps the data memory (6o) as shown by the arrow in FIG. 5(A).
, p and the data bits at the same location of data memory B (61) are sequentially deleted by 1t12, and one of them is set to logical value #1.
#The contents of the counter (62) are set to 1 only when the other side is #Ol.
Add. It is assumed that this comparison operation is repeated ijN times, that is, from address 1 to address N. If the two audio signals are exactly the same and have the same phase, the contents of the counter (62) will be approximately O, and if the two audio signals are exactly the same, with only the phase inverted (reverse phase), it will be N. It is clear that the content of the two audio signals is different, and if N is sufficiently large and NXts, that is, the period of the audio signal to be compared is sufficiently long, then
Add z (100) and compare! If the content of Kakunta (62) is greater than Nthl after the completion of 2wJ work and N
It is clear that it is possible to determine that the contents are the same if the values are smaller than th2, and that the contents are inconsistent in other cases. If we consider two voices OW8, exactly the same argument applies.In other words, the voice signal has a frequency ef, a period T (T=1/f), and the rest is a match, so the counter (6
2) Value No ri Finally almost No=Zo N: 2 t r N , 11
015. (3) In the case of linear audio signal or reverse phase, 2τ No fortune (1--)N=(1-2tτ)N...
...(4). Here, equations (3) and (4) have exactly the same form as equations (1) and (2) in the conventional example, and if ±8 is set sufficiently small and N is set sufficiently large, θO in Fig. 3 will remain as N. It can be considered as the value of No normalized by . Therefore, when two audio signals have the same content and there is a time difference τ, the degree of determination can be improved by giving a relative delay time t to one of the audio signals in advance, which is the same as in the conventional example. . As shown in FIGS. 5(B) and 5(C), this previous operation can be performed by comparing the data acquired at a time interval t at the time of data acquisition and repeating the above operation #. Here, the data acquisition interval ts is Q, 4
If [ms], then Figure 5 (b) shows the data memory.
Data memo of the contents of addresses 1 to N of AC60)! JB (6
This means that the contents of addresses 3 to N+2 in 1) are sequentially compared, and the result is the same as comparing the output of the zero cross detector (32) with a delay of Q, 8 [ms].

Therefore, the contents of the counter (62) that can be obtained from this rice supply NZ
If VH is replaced with N as explained above, it becomes Figure 3 01
Give the same rice supply as the graph.

Also, Fig. 5 (0) shows data memory memory (60) 3 to N.
+2 address and addresses 1 to N of data memory B (61) are compared, and the result is the same as comparing the output of the zero cross detector (33) with a delay of Q, 8 [mal], and this result is obtained. Contents of counter (62) Nz1jV
It becomes the same as the graph of FIG. 3 02 where aiN is replaced.

As a result, it can be seen that in this embodiment, by performing the comparative judgment operation three times using the control #J device (17), it is possible to perform a judgment completely equivalent to that of the conventional example.

It has been explained above that this embodiment can perform judgments equivalent to the conventional example, but the decisive difference from the conventional example is that it is possible to judge two signals with a larger time difference without almost increasing the hardware. This can be done with high accuracy; for example, even when making a judgment to allow a time difference of ±4 [mJ], data memory A (60) and data memory B
(61) I/iN+10 Comparison and judgment of the same address once as Bisoto, and the data of address 1=l~N of data memory A (60) and address J=eng+21 of data memory B (61) are 1 is changed from 1 to 5 and compared and judged 5 times, and conversely data memory B (61)
The data of the address J=l-N and the address of data memory (60) =, r-4-2t were compared and determined 5 times by changing 1 from 1 to 5'i, a total of 11 times. All that is required is to perform the comparison/judgment operation. Further, this determination can be made a total of 21 times, with the number of mutually shifted addresses being 1, to further increase the degree of determination. Furthermore, it is clear that a time difference larger than this can be easily dealt with by increasing the data memory and increasing the number of determinations.

As described above, according to the present invention, the number of hard query parts used for identity determination can be reduced, and identity determination can be performed with high accuracy even when there is a large time difference between two audio signals.

In addition, in the above explanation, it is assumed that data memory A and B have a memory area equivalent to approximately the time difference that should be judged, but if the time difference that should be allowed for judgment is relatively small, the data memory is allowed. As only the time difference,
It is also possible to provide as many kakutanks as the number of comparisons and determinations described above, to sequentially update the data memory contents in a data-taking manner, and to perform comparison and kakunta counting at the same time.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a Hatonoki radio receiver, Fig. 2 is a block diagram showing a conventional identity determination device, Fig. 3 is an explanatory diagram of the operation of identity determination, and Fig. 4 is an embodiment of the present invention. An exemplary Glock diagram, FIG. 5, is a detailed explanatory diagram of the present invention. In the figure, (1) is an antenna, (2) a distributor, (
6) is the first receiving system, (10) is the second receiving system, (11)
) is an audio signal switcher, (12) is a low frequency amplifier, (13
) fi speaker, (14) and (15) are electric field detectors, (16) are identity determiners, (17) I/i control device, (30) and (31) f/'i low-pass filters, ( 32
), (33) are zero cross detectors, (38), (
39) is a detector, (40) and (41) are voltage comparators, (60) I/'i first data memory, (61) is a second data memory, and (62). The same reference numerals in each figure indicate the same or corresponding parts. Agent Ge Shuxin - Figure 5 (, 4) (8) <C) Procedural amendment (voluntary) Zhuang 54 theory 178], 14 cases Display of patent application No. 57-84910
No. 2 Title of the invention: Radio receiver 3. Part 6: Subject of amendment: Claims of the specification and detailed description of the invention. 6. Contents of amendment 1) The scope of claims column of the specification is corrected as shown in the attached sheet. 2) The description will be amended as follows. 7. List of attached documents (1) One or more documents stating the scope of the claims after amendment 2 receiving system, a means for detecting the reception status of the receiving station selected by these two receiving systems and discriminating whether it is good or bad, and a signal necessary to distinguish between the output signals of the two receiving systems. When determining whether the output signals of the two receiving systems are different from the sameness determining device and the output of the sameness determining device, and determining that the two receiving stations are in the direction of the two receiving stations according to the system, A control device is provided for fixing the receiving station with a better reception state by one receiving system, fixing the output audio thereof to the audio output circuit, and shifting the other receiving system to an automatic tuning state, and the above-mentioned identity determiner Two low-pass filters, two zero-cross detectors, and two zero-cross detectors are connected to the above two low-pass filters to detect the audio signal level at the output of the low-pass filter and output a valid signal if this is higher than a predetermined judgment level. (2) The control device determines the identity when both the audio level signals of the identity determiner are valid. There are two memory areas that capture and temporarily store the outputs of the two zero-cross detectors of the device, and the data in these two memory areas is stored in multiple memory areas, either as a combination with the same capture time, or as a combination with a predetermined time difference. It is equipped with a counter that counts the number of matching or non-matching data for each judgment, and the value of the counter as a result of each judgment is equal to the first judgment number even if it is only once. If the number exceeds the second determination number or the number of determinations is less than the second determination number, the audio signals from the two reception systems are treated as having the same content, and if not, the content is assumed to be different and the operation is performed. radio receiver.

Claims (2)

[Claims] (1) First and second receiving systems configured to be able to automatically select stations independently of each other; these two receiving systems detect the reception status of the selected receiving station and discriminate whether it is good or bad. means,
An identity determiner provides a signal necessary to distinguish between the output signals of the two receiving systems, and from the output of the identity determiner, it is determined that the output signals of the two receiving systems are different, and the two receive signals are determined to be different. If the system determines that two receiving stations have the same content, the receiving station with better reception status is fixed to one receiving system, its output audio is fixed to the audio output circuit, and the other receiving system is automatically fixed. A control device for shifting to a tuning state is installed, and the identity determiner is connected to two low-pass filters, two zero-cross detectors, and the two low-pass filters, and detects the audio signal level of the low-pass filter output. and a means for giving a signal to a control device that is made valid when this is higher than a predetermined determination level, and a signal that is made invalid when it is not allowed. (2) Two memory areas in which the control device captures and temporarily stores the two zero-cross detector outputs of the identity determiner when both audio level signals of the identity determiner are valid, and these two memory areas. The above data is taken as a set with the same time point, or as a set with a predetermined time difference, and it is determined whether each memory data matches a number of times. Alternatively, if the value of kakunta as a result of each judgment exceeds the number of judgments of 111 even once or is less than the second number of judgments, mt is the value of kakunta that counts the number of data that is inconsistent. 1. A radio receiver according to claim 1, characterized in that the audio signals have the same content, but if this is not possible, the audio signals are pre-recorded with different content.