JPH06105255A - Multi-system sound intermediate frequency processing unit - Google Patents

Abstract

PURPOSE:To facilitate the circuit integration by reducing the number of externally mounted components such as a changeover switch in the multi-system sound intermediate frequency processing unit so as to simplify the processing unit. CONSTITUTION:A selection means SE1 selects an FM signal having carrier frequencies of 5.5-6.5MHz from an inputted sound intercarrier signal and converts the carrier frequencies into 6MHz by using a 0.5MHz reference signal. A selection means SE2 selectively transmits an FM signal whose carrier frequency is 4.5MHz. A doubler 9c doubles a carrier frequency of 4.5MHz. A frequency conversion means CO1 converts a carrier frequency of the FM signal outputted from the doubler 9c into 6MHz. Then the carrier frequency of the FM signal is unified to be 6MHz and the frequency shift is kept the same simultaneously and the FM detector 15a detects the FM signal. Thus, the FM detector 15a copes with the almost equal frequency shift and the same carrier frequency and the circuit such as a changeover switch or the like is omitted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-system audio intermediate frequency processing device such as a television or VTR, and more particularly to a technique for simplifying the multi-system audio intermediate frequency processing device.

[0002]

2. Description of the Related Art Recently, in an audio intermediate frequency processing circuit,
A multi-method capable of supporting different standards depending on each region, that is, a so-called multi-standard compatible method has been increasingly used. Although there are various processing methods, FIG. 10 is a block diagram showing the configuration of the most commonly used conventional multi-system audio intermediate frequency processing device.

In the figure, reference numeral 1 is an input terminal for inputting an audio intercarrier signal, 2 is one end connected to the input terminal 1, and a ceramic filter for transmitting an FM signal having a carrier frequency of 5.5 MHz, 3 is one end input Ceramic filter which is connected to terminal 1 and has an FM signal with a carrier frequency of 6.0 MHz, 4 is a ceramic filter which has one end connected to input terminal 1 and which has an FM signal of which carrier frequency is 6.5 MHz, 6 is for 500 KHz Oscillator,
5 is a local oscillator which is connected to the oscillator 6 and outputs a reference signal having a frequency of 500 KHz, 7 is connected to the local oscillator 5 and the other ends of the ceramic filters 2 to 4, and the input reference signal and 5.5 MHz, 6.0 MHz and 6.
A frequency mixer for performing frequency mixing with an FM signal having a carrier frequency of 5 MHz, 8 is a ceramic filter which has one end connected to the input terminal 1 and passes an FM signal having a carrier frequency of 4.5 MHz, and 14 is a frequency mixer 7 Is connected to the output of the ceramic filter and has the same characteristics as the ceramic filter 3, 13 is the ceramic filter 8
Is connected to the other end of the ceramic filter 14 and selectively outputs only one output, and 15 is connected to the changeover switch 13 and has a carrier frequency of 4.5.
FM detector for detecting FM signal of MHz or 6.0 MHz, 16 connected to FM detector 15 for detecting FM
A resonance circuit that tunes with the carrier frequency of the signal, 17 is an output terminal that outputs the detection result, 19 and 20 are changeover switches that interlock with the changeover switch 13 to turn on and off, 21
Is a resistor connected between the FM detector 15 and the output terminal 17, 22 is a resistor connected between the switch 20 and the output terminal, and 18 is connected between the resonance circuit 16 and the changeover switch 19. It is a trimmer capacitor. Further, the ceramic filters 2, 3 and 4 and the frequency mixer 7 are F of the carrier frequency of 6.0 MHz from the audio intercarrier signal.
The selecting means SE1 for outputting the M signal is configured. The ceramic filter 8 constitutes a selecting means SE2 which selectively outputs only an FM signal having a carrier frequency of 4.5 MHz from the audio intercarrier signal.

Next, the operation will be described. The audio intercarrier signal input from the input terminal 1 is 5.5 MHz, 6.0 MHz, and
An FM signal having a carrier frequency of 6.5 MHz is extracted and input to the frequency mixer 7. On the other hand, the local oscillator 5 oscillates a reference signal having a frequency of 500 KHz using the oscillator 6 and outputs the reference signal to the frequency mixer 7. 5. The FM signal output from the frequency mixer 7 having the carrier frequencies of 5.5 MHz and 6.5 MHz is frequency-converted, and 6.
The FM signal has a carrier frequency of 0 MHz. After adding the FM signal having the carrier frequency converted and the FM signal having the carrier frequency of 6.0 MHz transmitted through the ceramic filter 3, the 6.0 MHz filter 1 is added.
At 4, the signal passes only 6.0 MHz and is input to the terminal a of the changeover switch 13. Further, only the FM signal having a carrier frequency of 4.5 MHz passes through the output of the ceramic filter 8, and this FM signal is the terminal b of the changeover switch 13.
Entered in. Then, with the changeover switch 13, an FM signal with a carrier frequency of 4.5 MHz and a carrier frequency of 6.0 M
The frequency is switched to the FM signal of Hz, and any FM signal is input to the FM detector 15. Now, assuming that the terminal a of the switch 13 is connected, the FM signal of 6.0 MHz is input to the FM detector 15. The resonance circuit 16 of the FM detector 15 is adjusted so as to detect an FM signal of 6.0 MHz. At this time, since the terminal a of the changeover switch 20 is connected, it is divided by the output resistance. Therefore, the detection output from the FM detector 15 is
It is divided by the resistors 21 and 22 and output from the output terminal 17. Next, when the changeover switch 13 is tilted to the side of the terminal b, an FM signal having a carrier frequency of 4.5 MHz is input to the FM detector 15 from the output of the changeover switch 13. At this time, the trimmer capacitor 18 is connected in parallel to the resonance circuit 16 by the changeover switch 19. Therefore, the resonance frequency is 4.
Switch to 5MHz. At the same time, the changeover switch 20 also has a terminal b.
Are connected to each other, and the output is not divided by resistors, and is directly output to 17 through the resistor 21.

As described above, the carrier frequency is 5.5 MH.
The FM, z, 6.0 MHz, and 6.5 MHz FM signals are all converted to a carrier frequency of 6.0 MHz, and any voice intercarrier signal automatically has a carrier frequency of 6.0 MH.
z is detected. Also, at 4.5 MHz, 3
By simultaneously switching the two changeover switches 13, 19 and 20 from the terminal a to the terminal b, the FM signal having the same level as the FM signal can be obtained.
The detection output can be obtained.

Here, the frequency for performing FM detection is 6.0M.
At the time of Hz, the resistors 21 and 22 divide the frequency difference of the FM signal having a carrier frequency of 4.5 MHz within ±.
This is because the frequency is 25 KHz and the others are doubled to ± 50 KHz, and it is necessary to match the audio output level between the FM signal having the carrier frequency of 4.5 MHz and the other three signals.

[0007]

Since the conventional multi-system audio intermediate frequency processing device is constructed as described above,
In order to be able to detect an FM signal having a carrier frequency of 5 MHz, three changeover switches are required, and one adjustment of the resonance circuit 16 is also required, which makes the circuit complicated. was there.

The present invention has been made to solve the above-mentioned problems, and can reduce the number of changeover switches,
It is an object of the present invention to obtain a multi-system audio intermediate frequency processing device which is inexpensive and suitable for an integrated circuit by reducing the number of adjustment points.

[0009]

According to a first aspect of the present invention, there is provided a multi-system audio intermediate frequency processing device, wherein an oscillator for oscillating a first reference signal having a predetermined frequency and an audio intercarrier signal are input to the oscillator. First selecting means for selectively outputting a first FM signal having a first carrier frequency and a frequency shift in a first range by using the first reference signal given by the above; Inputting an inter-carrier signal and selectively outputting a second FM signal having a second carrier frequency different from the first carrier frequency and a frequency deviation in a second range narrower than the first range; Second selecting means and the first FM signal output from the first selecting means are input through a first path, and the second FM signal output from the second selecting means is input into a second path. Enter through the path of FM having a predetermined carrier frequency
An FM detector that detects a signal, and a frequency detector that is provided in the second path and that multiplies the frequency of the second FM signal by a predetermined ratio to determine the frequency shift of the second FM signal. A multiplier for making the range approximately the same, and the second FM signal which is provided in the first or second path and is processed by the first FM signal or before or after being processed by the multiplier. And a second reference signal are subjected to frequency mixing, and carrier frequency conversion is performed so that the carrier frequencies of the first and second FM signals input to the FM detector become the same as the predetermined carrier frequency. And a carrier frequency converter that operates.

In a preferred aspect of the multi-system audio intermediate frequency processing device according to the first aspect of the present invention, the audio intercarrier signal has a carrier frequency of 4.5 MHz, 5.5 MHz,
The frequency deviations of the FM signals at 6.0 MHz and 6.5 MHz and the carrier frequency of 4.5 MHz are the carrier frequencies of 5.5 MHz, 6.0 MHz and 6.5 MHz.
The FM signal of about half the FM signal, the oscillator includes an oscillator that oscillates a first reference signal having a frequency of 500 KHz, and the first selecting means includes the carrier frequency of 5.5 MHz, 6. 0MHz and 6.5MH
5. means for filtering only the FM signal of z and the carrier frequency of the filtered FM signal using the first reference signal.
Means for converting to 0 MHz and outputting as the first FM signal, and the second selecting means filters only the FM signal with the carrier frequency of 4.5 MHz to selectively output as the second FM signal. And a means for outputting to the FM
The detector has an FM with a carrier frequency of 6.0 MHz.
An FM detector for detecting a signal is included, and the multiplier doubles the frequency of the second FM signal to obtain the second FM signal.
Of the FM signal, the carrier frequency converter being provided in the second path, before or after being processed by the multiplier. Carrier frequency conversion for performing frequency mixing of the second FM signal after being processed and the second reference signal, and converting the carrier frequency of the second FM signal input to the FM detector to 6.0 MHz. It is an aspect including a container.

In another preferred aspect of the multi-system audio intermediate frequency processing device according to the first invention, the audio intercarrier signal has a carrier frequency of 4.5 MHz and 5.5 MH.
z, 6.0 MHz and 6.5 MHz, and the frequency deviation of the FM signal with the carrier frequency of 4.5 MHz is the carrier frequencies of 5.5 MHz, 6.0 MHz and 6.5 M.
Hz FM signal, and the oscillator includes an oscillator that oscillates a first reference signal having a frequency of 500 KHz, and the first selecting means includes the carrier frequency of 5.5 MHz, 6 MHz. 0.0MHz and 6.5M
Means for filtering only the FM signal of Hz, and the filtered FM
Means for converting the carrier frequency of the signal to 6.0 MHz by using the first reference signal and outputting as the first FM signal, wherein the second selecting means has the carrier frequency of 4.5 MHz. Means for filtering only the FM signal and selectively outputting as the second FM signal, the FM detector including an FM detector for detecting an FM signal having a carrier frequency of 9.0 MHz; The multiplier includes a multiplier that doubles the frequency of the second FM signal so that the frequency deviation of the second FM signal is in the same range as the first range. A device is provided in the first path for performing frequency mixing of the first FM signal and the second reference signal,
It is an aspect including a carrier frequency converter for converting the carrier frequency of the first FM signal input to the detector to 9.0 MHz.

According to a second aspect of the present invention, there is provided a multi-system audio intermediate frequency processing device, wherein an oscillator for oscillating a first reference signal having a predetermined frequency and an audio intercarrier signal are inputted and the first oscillator is given from the oscillator. Inputting the voice intercarrier signal, and a first selecting means for selectively outputting a first FM signal having a first carrier frequency and a frequency deviation in a first range using the reference signal of , The first
Second selecting means for selectively outputting a second FM signal having a second carrier frequency different from the second carrier frequency and a frequency deviation in a second range narrower than the first range, and the first selecting means. The first FM signal output from the selecting means is input through a first path, the second FM signal output from the second selecting means is input through a second path, and a predetermined carrier frequency is input. An FM detector for detecting an FM signal having: and a first FM detector provided in the second path.
A frequency divider for dividing the frequency of the FM signal by a predetermined ratio to make the frequency deviation of the first FM signal approximately the same as the second range; and a frequency divider in the first or second path. Frequency mixing is performed between the first FM signal and the second reference signal before or after being processed by the second FM signal or the frequency divider, and input to the FM detector. And a carrier frequency converter that converts the carrier frequency so that the carrier frequencies of the first and second FM signals are the same as the predetermined carrier frequency.

In a preferred aspect of the multi-system audio intermediate frequency processing device according to the second invention, the audio intercarrier signal has a carrier frequency of 4.5 MHz, 5.5 MHz,
The frequency deviations of the FM signals at 6.0 MHz and 6.5 MHz and the carrier frequency of 4.5 MHz are the carrier frequencies of 5.5 MHz, 6.0 MHz and 6.5 MHz.
The FM signal of about half the FM signal, the oscillator includes an oscillator that oscillates a first reference signal having a frequency of 500 KHz, and the first selecting means includes the carrier frequency of 5.5 MHz, 6. 0MHz and 6.5MH
z means for filtering only FM signals, and means for converting their carrier frequencies to 6.0 MHz using the first reference signal and outputting as the first FM signal,
The second selection means is configured to have the carrier frequency of 4.5 MHz.
3. The FM detector includes means for filtering only the FM signal of z and selectively outputting it as the second FM signal.
The frequency divider includes an FM detector for detecting an FM signal having a carrier frequency of 5 MHz.
A frequency divider for dividing the frequency of the M signal by a factor of 2 to make the frequency shift of the first FM signal comparable to the second range; Frequency mixing of the first FM signal and the second reference signal before or after being processed by the frequency divider, which is provided in the first path, and is input to the FM detector. The first
Is a mode including a carrier frequency converter that converts the carrier frequency of the FM signal into 4.5 MHz.

In another preferred aspect of the multi-system audio intermediate frequency processing device according to the second invention, the audio intercarrier signal has a carrier frequency of 4.5 MHz and 5.5 MH.
z, 6.0 MHz and 6.5 MHz, and the frequency deviation of the FM signal with the carrier frequency of 4.5 MHz is the carrier frequencies of 5.5 MHz, 6.0 MHz and 6.5 M.
Hz FM signal, and the oscillator includes an oscillator that oscillates a first reference signal having a frequency of 500 KHz, and the first selecting means includes the carrier frequency of 5.5 MHz, 6 MHz. 0.0MHz and 6.5M
Means for filtering only the FM signal of Hz, and the filtered FM
Means for converting the carrier frequency of the signal to 6.0 MHz by using the first reference signal and outputting as the first FM signal, wherein the second selecting means has the carrier frequency of 4.5 MHz. Means for filtering only the FM signal and selectively outputting it as the second FM signal, the FM detector including an FM detector for detecting an FM signal having a carrier frequency of 3.0 MHz; The frequency divider includes a frequency divider that divides the frequency of the first FM signal by half to make the frequency shift of the first FM signal approximately equal to the second range. The carrier frequency converter is provided in the second path, performs frequency mixing of the second FM signal and the second reference signal, and outputs the FM signal.
It is an aspect including a carrier frequency converter for converting the carrier frequency of the second FM signal input to the detector to 3.0 MHz.

In the multi-system audio intermediate frequency processing device according to the third aspect of the invention, a first FM signal having a carrier frequency of 4.5 MHz and a second FM signal having a carrier frequency of 5.5 MHz are selected from the input audio intercarrier signals. A signal selecting means for selectively outputting the FM signal, the third FM signal of 6.0 MHz, and the fourth FM signal of 6.5 MHz; an oscillator for oscillating a reference signal having a frequency of 5 MHz; A frequency mixer for inputting the output of the signal selecting means and the output of the oscillator and mixing the first to fourth FM signals and the reference signal, and the output of the frequency mixer are input, A frequency multiplier for multiplying the frequency of the output first and second FM signals by 6, a frequency of the third FM signal by 3, and a frequency of the fourth FM signal by 2. Input the output of the vessel, It detects the FM signal having a carrier frequency in the MHz and is configured with a FM detector.

A multi-system audio intermediate frequency processing device according to a fourth aspect of the present invention receives an audio inter-carrier signal, receives a first FM signal having a carrier frequency of 4.5 MHz and 5.5 MH.
signal selecting means for selectively outputting the second FM signal of z, the third FM signal of 6.0 MHz, and the fourth FM signal of 6.5 MHz; and oscillating the reference signal having a frequency of 5 MHz. Inputting the output of the signal selecting means and the output of the oscillator, and a frequency mixer for mixing the first to fourth FM signals and the reference signal, and an output of the frequency mixer. Phase-locked loop type FM that performs FM detection based on a reference frequency of 3 MHz
And a detector.

[0017]

The multiplier according to the first aspect of the present invention multiplies the frequency of the second FM signal by a predetermined ratio so that the frequency deviation of the second FM signal becomes approximately equal to the first range. The carrier frequency converter has the first and second input to the FM detector.
The carrier frequency is converted so that the carrier frequency of the FM signal becomes the same as the predetermined carrier frequency.
The detector only needs to correspond to one carrier frequency and one frequency deviation, and the switching means for coping with the plurality of carrier frequencies and the plurality of frequency deviations in the FM detector and the frequency to be detected are adjusted. The resonance circuit and the like can be simplified.

The frequency divider in the second invention is the first FM.
The frequency of the signal is divided by a predetermined ratio so that the frequency deviation of the first FM signal becomes approximately the same as that of the second range. Then, the carrier frequency converter converts the carrier frequency so that the carrier frequencies of the first and second FM signals input to the FM detector become the same as the predetermined carrier frequency.
The FM detector only needs to correspond to one carrier frequency and one frequency deviation. The FM detector determines a switching means for coping with a plurality of carrier frequencies and a plurality of frequency deviations, and a frequency to be detected. The resonance circuit and the like can be simplified.

The frequency mixer according to the third invention is the first mixer.
Through mixing the fourth FM signal with the reference signal,
An FM signal with a carrier frequency of 0.5 MHz;
FM signal with carrier frequency of 0MHz and 1.5M
And an FM signal having a carrier frequency of Hz. Then, the multiplier outputs 6 times the output FM signals,
An FM signal having a carrier frequency of 3.0 MHz is output after being multiplied by 3 and 2. Therefore, the FM detector is 3.
Since it is only necessary to detect the FM signal having the carrier frequency of 0 MHz, the configuration can be simplified.

Phase-locked
The loop-type FM detector mixes the first to fourth FM signals with the reference signal, and outputs the 0.
FM signals having carrier frequencies of 5 MHz, 1.0 MHz, and 1.5 MHz are input, and the carrier frequency of each FM signal is 1/3 of the integer of 3 MHz, so FM detection is performed based on the reference frequency of 3 MHz. be able to.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings. 1 is a block diagram showing the configuration of a multi-system audio intermediate frequency processing device according to a first embodiment of the present invention. Figure 1
, 9a is connected to the local oscillator 5, and is a doubler for multiplying the frequency of the input signal by 2. 9b is a doubler 9
2 which is connected to a and doubles the frequency of the input signal
The frequency multiplier 10 is connected to the frequency doublers 9a and 9b, mixes the outputs of the frequency doublers 9a and 9b to output a reference signal of 3 MHz, and 9c is connected to the other end of the ceramic filter 8. Input carrier frequency 4.5M
A frequency doubler for doubling the frequency of the FM signal of Hz, 12 inputs the output of the frequency doubler 9c and the frequency mixer 10 and mixes these signals to obtain F
It is a frequency mixer for converting the carrier frequency of the M signal, and other reference numerals that are the same as those in FIG. 10 indicate the same or corresponding portions as in FIG. Here, the doublers 9a to 9c and the frequency mixers 10 and 12 constitute carrier frequency conversion means CO1 for converting the carrier frequency.

Next, the operation will be described. Selection means SE
1, the operation of processing the FM signal having the carrier frequency of 5.5 to 6.5 MHz is completely the same as that of the conventional multi-system audio intermediate frequency processing device shown in FIG. 4.
The 4.5 MHz intercarrier signal that has passed through the 5 MHz filter 8 is converted to 9.0 MHz by the doubler 9c, and at the same time, the frequency deviation doubles to ± 50K.
Becomes Hz. This is input to the frequency mixer 12. On the other hand, the 500 KHz reference signal output from the local oscillator 5 is converted to 1 MHz by the doubler 9a, and further converted to 2 MHz by the cascaded doubler 9b. Doubler 9a,
The output of 9b is input to the frequency mixer 10, and a 3.0 MHz reference signal is obtained from the output of the frequency mixer 10. This 3 MHz reference signal is input to the other terminal of the frequency mixer 12, and 9.0 MHz input from the doubler 9c.
An FM signal having a z carrier frequency is frequency-converted at 3.0 MHz to generate an FM signal having a carrier frequency of 6.0 MHz.
Convert to signal. Therefore, the changeover switch 13 operates in the same manner as in the conventional example, but 6.0M is provided in the subsequent stage of the changeover switch 13.
The Hz ceramic filter 14 is connected, and all the audio intercarrier signals have a frequency of 6.0 MHz and a frequency deviation of ± 5.0 KHz and are converted to the FM detector 1.
Since it is input to 5a, the trimmer capacitor 18 and the resistors 21 and 22 which are conventionally required are unnecessary, and the resonance circuit 16a
The changeover switch 19 and the changeover switch 20 for adjusting the audio output level are omitted.

Next, a second embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a block diagram showing the configuration of a multi-system audio intermediate frequency processing device according to the second embodiment of the present invention. In FIG. 2, reference numeral 23 is a ceramic filter that passes an FM signal having a carrier frequency of 3.0 MHz,
Other reference numerals that are the same as those in FIG. The multi-system audio intermediate frequency processing device shown in FIG. 2 is shown in FIG.
As with the multi-system audio intermediate frequency processing device shown in FIG.
An FM signal having an FM carrier frequency of 15 Hz is detected by the FM detector 15.
It is configured to detect at a. The difference between the multi-system audio intermediate frequency processing device shown in FIG. 2 and the multi-system audio intermediate frequency processing device shown in FIG. 1 is that the FM signal output from the ceramic filter 8 having a carrier frequency of 4.5 MHz is converted into a frequency. CO2 carrier frequency 1.5 MH
It is converted to an FM signal of z, and this FM signal is doubled by a doubler 9c, a carrier frequency is 6.0 MHz, and frequency deviation ±
The point is that the FM signal of 50 KHz is used. In addition, the frequency conversion means CO2 outputs 50 from the local oscillator 5.
Doubler 9a for doubling the frequency of the 0 KHz reference signal
, A frequency mixer 10 for mixing the outputs of the local oscillator 5 and the doubler 9a, and a carrier frequency of 4.5 MHz that has passed through the output of the frequency mixer 10 and the ceramic filter 8.
The frequency mixer 12 for mixing the FM signal of No. 1 and the ceramic signal 23 for passing only the FM signal output from the frequency mixer 12 having the carrier frequency of 3.0 MHz.

Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a block diagram showing the configuration of a multi-system audio intermediate frequency processing device according to a third embodiment of the present invention. In FIG. 3, reference numeral 24 selectively selects either the output of the local oscillator 5 or the output of the frequency mixer 10 as a frequency mixer 7a.
1 is a change-over switch for inputting to the input terminal, and the same reference numerals as those in FIG. 1 denote the same or corresponding portions as in FIG. Figure 3
The multi-system audio intermediate frequency processing device shown in (1) is configured to detect an FM signal having a carrier frequency of 6.0 MHz by the FM detector 15a as in the multi-system audio intermediate frequency processing device shown in FIG. The multi-system audio intermediate frequency processing device shown in FIG. 3 is different from the multi-system audio intermediate frequency processing device shown in FIG. 1 in that an FM signal output from the doubler 9c and having a carrier frequency of 9.0 MHz is output. Is converted into an FM signal having a carrier frequency of 6.0 MHz by the frequency conversion means CO1, and this FM signal is doubled by the doubler 9c,
Carrier frequency 6.0MHz, frequency deviation ± 5.0KH
In this case, the changeover switch 13a and the changeover switch 24 operate in conjunction with each other so that the frequency mixer 7a can be used in common.

Next, a fourth embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a block diagram showing the configuration of a multi-system audio intermediate frequency processing device according to the fourth embodiment of the present invention. In FIG. 4, reference numeral 25 denotes the frequency of the input signal, which is halved.
½ divider, 15b has a carrier frequency of 4.5M
An FM detector for detecting an FM signal of Hz, 16b is a resonance circuit for adjusting the detection frequency of the FM detector 15b, and the same reference numerals as those in FIG. 2 denote the same or corresponding portions as those in FIG. The frequency conversion means CO3 doubles the frequency of the 500 KHz reference signal output from the local oscillator 5 2
A frequency multiplier 10a that mixes the outputs of the frequency multiplier 9a, the local oscillator 5 and the frequency doubler 9a, and a carrier frequency of 3.0M that has passed through the output of the frequency mixer 10 and the 1/2 frequency divider 25.
It is composed of a frequency mixer 12 that mixes an FM signal of Hz and a ceramic filter 8 that passes only the FM signal output from the frequency mixer 12 that has a carrier frequency of 4.5 KHz. At the same time, as the selection means SE2, the ceramic filter 8 also has a function of filtering an FM signal having a carrier frequency of 4.5 MHz from the audio intercarrier signal.

The operation of the multi-system audio intermediate frequency processing device of the fourth embodiment will be described. In the multi-system audio intermediate frequency processing device of the fourth embodiment, the same as in the second embodiment, 1.5.
A reference signal of MHz is created and output from the frequency mixer 10. On the other hand, the FM signal of 5.5 to 6.5 MHz is also converted into the carrier frequency of 6.0 MHz as in the second embodiment.
Obtained through the filter 14 for 6.0 MHz.
An FM signal having a carrier frequency of 0 MHz is divided by a 1/2 frequency divider 25 and converted into 3.0 MHz. At this time, the frequency deviation also changes from ± 50 KHz to ± 25 KHz and is input to the frequency mixer 26. Here, the frequency mixer 12 frequency-converts the FM signal of 3.0 MHz by using the reference signal of 1.5 MHz, and becomes the carrier frequency of 4.5 MHz, which is input to the terminal a of the changeover switch 13.
The input signal is directly input to the terminal b of the changeover switch 13 from the input terminal 1 and is FM-detected by the FM detector 15b connected to the 4.5 MHz resonant circuit 16b through the 4.5 MHz ceramic filter 8. Therefore, the trimmer capacitor 18 and the resistors 21 and 22 which are conventionally required
Is unnecessary, and the changeover switch 19 of the resonance circuit 16a and the changeover switch 20 for adjusting the sound output level can be omitted.

Next, a fifth embodiment of the present invention will be described with reference to the drawings. FIG. 5 is a block diagram showing the configuration of a multi-system audio intermediate frequency processing device according to the fifth embodiment of the present invention. 5, the same reference numerals as those in FIG. 4 denote the same or corresponding portions as those in FIG. The multi-system audio intermediate frequency processing device shown in FIG. 5 is configured to detect an FM signal having a carrier frequency of 4.5 MHz by the FM detector 15b similarly to the multi-system audio intermediate frequency processing device shown in FIG. There is. The multi-system audio intermediate frequency processing device shown in FIG. 5 is different from the multi-system audio intermediate frequency processing device shown in FIG. 4 in that the FM signal having a carrier frequency of 6.0 MHz output from the ceramic filter 14 is converted into frequency. CO4 is used to convert to an FM signal with a carrier frequency of 9.0 MHz, and this FM signal is 1 /
Frequency is divided by 2 frequency divider 25 and carrier frequency is 4.5 MHz.
z, frequency deviation ± 25 KHz. The frequency conversion means CO4 inputs the outputs of the doubler 9a and the doubler 9a for doubling the frequency of the 500 KHz reference signal output from the local oscillator 5, and sets the frequency to 2
A frequency doubler 9b for doubling the frequency, a frequency mixer 10 for mixing the outputs of the frequency doublers 9a, 9b, and an output of the frequency mixer 10 and an FM signal having a carrier frequency of 6.0 MHz passing through the ceramic filter 14. Frequency mixer 12
Of the FM signal output from the frequency mixer 12
It is composed of a ceramic filter 8 which allows only those having a carrier frequency of MHz to pass.

Next, a sixth embodiment of the present invention will be described with reference to the drawings. FIG. 6 is a block diagram showing the configuration of a multi-system audio intermediate frequency processing device according to a sixth embodiment of the present invention. In FIG. 6, 15c is an F having a carrier frequency of 3.0 MHz.
FM detector for detecting the M signal, 16c is an FM detector 15
A resonance circuit for adjusting the detection frequency of c, 27 is a ceramic filter that passes an FM signal having a carrier frequency of 3.0 MHz, and the same reference numerals as those in FIG. 2 denote the same or corresponding portions as those in FIG. The frequency converting means CO5 includes a doubler 9a that doubles the frequency of the 500 KHz reference signal output from the local oscillator 5, and a frequency mixer 10 that mixes the outputs of the local oscillator 5 and the doubler 9a. The frequency mixer 12 for mixing the output of the frequency mixer 10 and the FM signal of the carrier frequency of 4.5 MHz which is the output of the selecting means SE2, and the carrier frequency of 3.0 KHz among the FM signals output by the frequency mixer 12 It is composed of a ceramic filter 27 that passes only what it has.

The operation of this multi-system audio intermediate frequency processing device will be described. In the multi-system audio intermediate frequency processing device of the sixth embodiment, a reference signal of 1.5 MHz is created and output from the frequency mixer 10 in the same manner as in the fourth embodiment. On the other hand, an FM signal with a carrier frequency of 5.5 to 6.5 MHz is also converted into a carrier frequency of 6.0 MHz as in the fourth embodiment.
The FM signal having this carrier frequency obtained through the filter 14 for 6.0 MHz is converted to 3.0 MHz by the 1/2 frequency divider 25. At this time, the frequency deviation is ± 50K
It becomes ± 25 KHz from Hz. On the other hand, the frequency mixer 12 frequency-converts the 4.5 MHz FM signal output from the ceramic filter 8 by using the 1.5 MHz reference signal to obtain a carrier frequency of 3.0 MHz, and the terminal b of the changeover switch 13. Entered in. The output from the frequency divider 25 is directly input to the terminal a of the changeover switch 13, and the 3.0 MHz ceramic filter 2
FM detection is performed by the FM detector 15c connected to the resonance circuit 16c for 3.0 MHz through 7. Therefore, the trimmer capacitor 18 and the resistors 21 and 22 which are conventionally required are unnecessary, and the changeover switch 19 of the resonance circuit 16a and the changeover switch 20 for adjusting the sound output level can be omitted.

Next, a seventh embodiment of the present invention will be described with reference to the drawings. FIG. 7 is a block diagram showing the arrangement of a multi-system audio intermediate frequency processing device according to the seventh embodiment of the present invention. In FIG. 7, 15d is a carrier frequency of 9.0 MH
An FM detector for detecting the FM signal of z, 16d is a resonance circuit for determining the detection frequency of the FM detector 15d, 28 is a ceramic filter for passing the FM signal of carrier frequency 9.0 MHz, and the same reference numerals as those in FIG. The same or corresponding parts as in FIG. 1 are shown. The frequency conversion means CO6 is
A doubler 9a that doubles the frequency of the 500 KHz reference signal output from the local oscillator 5, and a doubler 9b that doubles the frequency of the signal output from the doubler 9a,
Frequency mixer 10 for mixing the outputs of the doublers 9a and 9b
And the output of the frequency mixer 10 and the ceramic filter 1
Frequency mixer 12 that mixes an FM signal with a carrier frequency of 6.0 MHz, which is the output of No. 4, and a ceramic filter 28 that passes only the FM signal output from the frequency mixer 12 that has a carrier frequency of 9.0 KHz.
It is composed of

The operation of this multi-system audio intermediate frequency processing device will be described. In the multi-system audio intermediate frequency processing device of the seventh embodiment, a 3.0 MHz reference signal is created and output from the frequency mixer 10 as in the first embodiment. On the other hand, an FM signal with a carrier frequency of 5.5 to 6.5 MHz is also converted into a carrier frequency of 6.0 MHz as in the first embodiment.
By the frequency mixer 12, the ceramic filter 14
FM signal of 6.0MHz output from is 3.0MHz
Is converted into a carrier frequency of 9.0 MHz and input to the terminal b of the changeover switch 13. Further, the FM signal having this carrier frequency obtained through the filter 8 for 4.5 MHz is converted to 9.0 MHz by the doubler 9c. At this time, the frequency deviation is ±
It has changed from 25 KHz to ± 50 KHz. The output from the doubler 9c is directly input to the terminal a of the changeover switch 13 and is connected to the resonance circuit 16d for 9.0 MHz through the 9.0 MHz ceramic filter 28.
FM detection is performed by the M detector 15d. Therefore, the changeover switch 19 of the resonance circuit 16a and the changeover switch 20 for adjusting the sound output level, which are conventionally required, can be omitted.

Next, an eighth embodiment of the present invention will be described with reference to the drawings. FIG. 8 is a block diagram showing the structure of a multi-system audio intermediate frequency processing device according to the eighth embodiment of the present invention. In FIG. 8, 6a is an oscillator for 5 MHz, 5a is a local oscillator which is connected to the oscillator 6a and oscillates a reference signal of 5 MHz, 7 is connected to the local oscillator 5a, and is output from the ceramic filters 2 to 4, 8. Carrier frequency 4.5
MHz, 5.5 MHz, 6.5 MHz and 6.5 MHz
Frequency mixer for mixing the FM signal of 3 MHz with the reference signal of 3 MHz, MU1 is a multiplication means for multiplying the frequency of the output signal output from the frequency mixer 7 by 2 times, 3 times and 6 times, 15c
Is an FM signal having a carrier frequency of 3.0 MHz.
An FM detector for M detection, 16c is a resonance circuit that determines the detection frequency in the FM detector 15c, and other reference numerals that are the same as those in FIG. 1 indicate the same or corresponding portions in FIG. The carrier frequency is 4.5MHz, 5.5MH
The selection means SE3 for selectively outputting the FM signals of z, 6.5 MHz and 6.5 MHz are ceramic filters 2 to 2.
It is composed of 4 and 8. The multiplication unit MU1 is composed of an amplitude limiter 30 and a band filter 31 for 3 MHz. That is, the required carrier frequency of the input signal harmonics generated by the amplitude limiter 30 is 3.0 MHz.
By passing only the FM signal of z, 0.5 MHz,
It is a multiplication means for multiplying the carrier frequencies of 1.0 MHz and 1.5 MHz.

Next, the operation will be described. The audio intercarrier signal input to the input terminal 1 is selected by the selection means SE3.
, The carrier frequency is 4.5 to 6.5M.
Only the FM signal of Hz is output. In the frequency mixer 7, these FM signals are mixed with the reference signal of 5 MHz output from the local oscillator 5a, and 0.5 MHz, 1.0
Converted to FM signals with carrier frequencies of MHz and 1.5 MHz. Then, the converted FM signals are amplitude-limited by the amplitude limiter 30 to generate harmonics. Therefore, among the harmonics output from the amplitude limiter 30, 0.5 MHz is 6 times, 1 MHz is 3 times,
It contains a 3 MHz signal that doubles 1.5 MHz. Only the FM signal having the carrier frequency to be detected by the FM detector from the generated harmonics is filtered by the band filter 31.
And then detected by the FM detector 15c and output. Therefore, as compared with the conventional multi-system audio intermediate frequency processing device, the trimmer capacitor 1 which has a simple structure and is conventionally required is used.
8. The changeover switch 19 can be omitted, and the configuration suitable for integration can be achieved.

Next, a ninth embodiment of the present invention will be described with reference to the drawings. FIG. 9 is a block diagram showing the arrangement of a multi-system audio intermediate frequency processing device according to the ninth embodiment of the present invention. In FIG. 9, 15e is an FM detector that detects the FM signal input based on the 3.0 MHz reference signal using the phase locked loop method, and 32 is the FM detector 15
8 is a resistor for adjusting the detection frequency in e, and the same reference numerals as those in FIG. 8 denote the same portions as those in FIG. 8 or portions corresponding to FIG.

Next, the operation will be described. The audio intercarrier signal input to the input terminal 1 is selected by the selection means SE3.
, The carrier frequency is 4.5 to 6.5M.
Only the FM signal of Hz is output. In the frequency mixer 7, these FM signals and the reference signal of 5 MHz output from the local oscillator 5a are mixed, and 0.5 MHz, 1.
FM with carrier frequency of 0MHz and 1.5MHz
Converted to a signal. And 0.5MHz, 1.0MH
An FM signal having a carrier frequency of z and 1.5 MHz has a carrier frequency that is an integer fraction of 3 MHz, and the phase-locked loop system itself has a frequency dividing function. Accordingly, the frequency of the reference signal can be detected by the FM detector 15e and output without changing the frequency of the reference signal. Therefore, as compared with the conventional multi-system audio intermediate frequency processing device, the trimmer capacitor 18 and the changeover switch 19, which are conventionally required, can be omitted with a simple configuration, and the configuration suitable for integration can be obtained.

[0036]

As described above, according to the multi-system audio intermediate frequency processing device of the invention described in claim 1, the frequency of the second FM signal provided in the second path is multiplied by a predetermined ratio. A multiplier for making the frequency deviation of the second FM signal comparable to that of the first range, and before being processed by the first FM signal or the multiplier provided in the first or second path. Alternatively, frequency mixing of the processed second FM signal and the second reference signal is performed, and the carrier frequencies of the first and second FM signals input to the FM detector are the same as the predetermined carrier frequency. Therefore, in the FM converter, the audio intercarrier signal input to the input terminal has the same carrier frequency and the same level. F with frequency shift Can be processed as a signal, there is an effect that the apparatus omitted changeover switch or the like may be suitable for integration with simplified. This also has the effect of making the device cheaper.

According to the multi-system audio intermediate frequency processing device of the second aspect of the present invention, the multiplier doubles the frequency of the second FM signal to make the frequency deviation of the second FM signal the first. A carrier frequency converter including a multiplier for making the range approximately the same is provided in the second path, and the second FM signal and the second reference signal before or after being processed by the multiplier. The second FM that mixes the frequency with and input to the FM detector.
Since it is configured to include a carrier frequency converter that converts the carrier frequency of the signal to 6.0 MHz, the FM
In the converter, the voice intercarrier signal input to the input terminal can be processed as an FM signal having a carrier frequency of 6.0 MHz and a frequency deviation in the first range, and corresponding to an actual standard. With a simple configuration, there is an effect that the changeover switch or the like can be omitted and the device can be simplified to be suitable for integration. This also has the effect of making the device cheaper.

According to the multi-system audio intermediate frequency processing device of the third aspect of the present invention, the multiplier doubles the frequency of the second FM signal to make the frequency shift of the second FM signal the first. A carrier frequency converter including a multiplier for making the range approximately the same as that of the range is provided in the first path, performs frequency mixing of the first FM signal and the second reference signal, and operates the FM detector. The carrier frequency of the first FM signal input to
Since it is configured so as to include a carrier frequency converter for converting to z, the FM converter converts the audio intercarrier signal input to the input terminal at a carrier frequency of 9.0 MHz and frequency deviation in the first range. FM with transfer
There is an effect that it can be processed as a signal, has a simple configuration corresponding to an actual standard, and can simplify a device by omitting a changeover switch and the like, and can be suitable for integration. This also has the effect of making the device cheaper.

According to the multi-system audio intermediate frequency processing device of the fourth aspect of the invention, the first system is provided in the second path, and the first F
A frequency divider that divides the frequency of the M signal at a predetermined ratio to make the frequency deviation of the first FM signal approximately equal to the second range; and a frequency divider that is provided in the first or second path. 1st before or after being processed by 2 FM signals or frequency dividers
Frequency mixing of the FM signal and the second reference signal of
Since the first and second FM signals input to the M detector include a carrier frequency converter that converts the carrier frequency so that the carrier frequencies of the first and second FM signals become the same as the predetermined carrier frequency, the FM In the converter, the audio intercarrier signal input to the input terminal has the same carrier frequency and F having a frequency deviation in the first range.
There is an effect that it can be processed as an M signal, and the changeover switch or the like can be omitted to simplify the device and make it suitable for integration. This also has the effect of making the device cheaper.

According to the multi-system audio intermediate frequency processing device of the fifth aspect of the present invention, the frequency divider divides the frequency of the first FM signal into halves to obtain the frequency of the first FM signal. A carrier frequency converter is provided in the first path, the frequency divider including a frequency divider for making the deviation comparable to the second range, and the carrier frequency converter is provided in the first path before or after being processed by the frequency divider. Since it is configured to include a carrier frequency converter that performs frequency mixing of the FM signal and the second reference signal and converts the carrier frequency of the first FM signal input to the FM detector to 4.5 MHz. , An FM converter can process an audio intercarrier signal input to an input terminal as an FM signal having a carrier frequency of 4.5 MHz and a frequency deviation in a second range, and corresponds to an actual standard. With a simple configuration, There is an effect that can be suitable for integration by simplifying the apparatus by omitting the like. This also has the effect of making the device cheaper.

According to the multi-system audio intermediate frequency processing device of the sixth aspect of the invention, the frequency divider divides the frequency of the first FM signal by a factor of two to obtain the frequency of the first FM signal. A carrier frequency converter is provided in the second path for frequency mixing the second FM signal and the second reference signal. , The carrier frequency of the second FM signal input to the FM detector is 3.0M.
Since it is configured to include a carrier frequency converter for converting to Hz, in the FM converter, the audio intercarrier signal input to the input terminal has a carrier frequency of 3.0 MHz and a frequency deviation in the second range. F with transfer
There is an effect that it can be processed as an M signal, has a simple configuration corresponding to an actual standard, and can simplify a device by omitting a changeover switch and the like and suitable for integration. This also has the effect of making the device cheaper.

According to the multi-system audio intermediate frequency processing device of the seventh aspect of the invention, the oscillator for oscillating the reference signal having a frequency of 5 MHz, the output of the signal selecting means and the output of the oscillator are inputted, and Since the frequency mixer that mixes the fourth FM signal and the reference signal is provided, the FM signal output from the frequency mixer is easily multiplied by the multiplier, and the FM converter has an input terminal. The audio inter-carrier signal input to can be processed as an FM signal having a carrier frequency of 3.0 MHz, has a simple configuration corresponding to an actual standard, and can be integrated by simplifying the device by omitting a changeover switch and the like. There is an effect that it can be made suitable for conversion. This also has the effect of making the device cheaper.

According to the multi-system audio intermediate frequency processing device of the eighth aspect of the invention, the oscillator for oscillating the reference signal having a frequency of 5 MHz, the output of the signal selecting means and the output of the oscillator are inputted, and A frequency mixer for mixing the fourth FM signal and the reference signal, and a phase-locked loop type FM detector for inputting the output of the frequency mixer and performing FM detection based on the reference frequency of 3 MHz are provided. Since it is configured, even if FM signals of different carrier frequencies are input to the FM converter, each frequency is 3 MHz.
Since it is a multiple of the integer, it does not have to switch the frequency of the reference signal according to the frequency, and has a simple configuration that corresponds to the actual standard. There is an effect that it can be suitable. This also has the effect of making the device cheaper.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a multi-system audio intermediate frequency processing device according to a first embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a multi-system audio intermediate frequency processing device according to a second embodiment of the present invention.

FIG. 3 is a block diagram showing a configuration of a multi-system audio intermediate frequency processing device according to a third embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a multi-system audio intermediate frequency processing device according to a fourth embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a multi-system audio intermediate frequency processing device according to a fifth embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a multi-system audio intermediate frequency processing device according to a sixth embodiment of the present invention.

FIG. 7 is a block diagram showing the structure of a multi-system audio intermediate frequency processing device according to a seventh embodiment of the present invention.

FIG. 8 is a block diagram showing the configuration of a multi-system audio intermediate frequency processing device according to an eighth embodiment of the present invention.

FIG. 9 is a block diagram showing a configuration of a multi-system audio intermediate frequency processing device according to a ninth embodiment of the present invention.

FIG. 10 is a block diagram showing a configuration of a conventional multi-system audio intermediate frequency processing device.

[Explanation of symbols]

 2-4,8 Ceramic filter 5 Local oscillator 6 Oscillator 7,12 Frequency mixer 9a-9c Double multiplier 25 1/2 divider 13,13a Changeover switch 15a-15e FM detector 16a-16d Resonant circuit

Claims (8)

[Claims] 1. An oscillator which oscillates a first reference signal having a predetermined frequency, and a first carrier frequency, which receives a voice intercarrier signal and uses the first reference signal provided from the oscillator. A first FM having a frequency shift in a first range
First selecting means for selectively outputting a signal; a second carrier frequency different from the first carrier frequency for inputting the voice intercarrier signal;
Second selecting means for selectively outputting a second FM signal having a frequency deviation in a second range narrower than the above range, and the first FM signal output from the first selecting means for the first FM signal. An FM detector for inputting the second FM signal output from the second selecting means through a second path and detecting an FM signal having a predetermined carrier frequency; A multiplier provided in the second path for multiplying the frequency of the second FM signal by a predetermined ratio to make the frequency deviation of the second FM signal approximately the same as the first range; The first F is provided in the first or second path.
The first signal input to the FM detector by performing frequency mixing of the M signal or the second FM signal before or after being processed by the multiplier and the second reference signal.
And a carrier frequency converter for converting the carrier frequency of the second FM signal so that the carrier frequency of the second FM signal becomes the same as the predetermined carrier frequency. 2. The voice intercarrier signal has a carrier frequency of 4.5 MHz, 5.5 MHz, 6.0 MH.
z and 6.5 MHz, and the carrier frequency is 4.5.
The frequency deviation of the FM signal of MHz includes an FM signal of about half of the FM signals of the carrier frequencies of 5.5 MHz, 6.0 MHz and 6.5 MHz, and the oscillator includes a first reference signal having a frequency of 500 KHz. An oscillator that oscillates, wherein the first selecting unit has the carrier frequency of 5.5 MH
means for filtering only the FM signals of z, 6.0 MHz and 6.5 MHz, and the first FM signal by converting the carrier frequency of the filtered FM signal to 6.0 MHz using the first reference signal. And a means for outputting as the carrier frequency of 4.5 MHz.
and a means for selectively outputting only the FM signal of z as the second FM signal, wherein the FM detector includes an FM detector for detecting an FM signal having a carrier frequency of 6.0 MHz. The carrier frequency converter includes a multiplier that doubles the frequency of the second FM signal to double the frequency deviation of the second FM signal to the same extent as the first range. Is provided in the second path, performs frequency mixing of the second FM signal and the second reference signal before or after being processed by the multiplier, and performs the FM detection. 2. The multi-system audio intermediate frequency processing device according to claim 1, further comprising a carrier frequency converter that converts a carrier frequency of the second FM signal input to the converter to 6.0 MHz. 3. The voice intercarrier signal has a carrier frequency of 4.5 MHz, 5.5 MHz, 6.0 MH.
z and 6.5 MHz, and the carrier frequency is 4.5.
The frequency deviation of the FM signal of MHz includes an FM signal of about half of the FM signals of the carrier frequencies of 5.5 MHz, 6.0 MHz and 6.5 MHz, and the oscillator includes a first reference signal having a frequency of 500 KHz. An oscillator that oscillates, wherein the first selecting unit has the carrier frequency of 5.5 MH
means for filtering only the FM signals of z, 6.0 MHz and 6.5 MHz, and the first FM signal by converting the carrier frequency of the filtered FM signal to 6.0 MHz using the first reference signal. And a means for outputting as the carrier frequency of 4.5 MHz.
The FM detector includes means for filtering only the FM signal of z and selectively outputting it as the second FM signal, wherein the FM detector is an FM detector for detecting an FM signal having a carrier frequency of 9.0 MHz. The carrier may include a multiplier that doubles a frequency of the second FM signal to make a frequency shift of the second FM signal in a range similar to the first range. A frequency converter is provided in the first path, performs frequency mixing of the first FM signal and the second reference signal, and inputs the carrier of the first FM signal to the FM detector. The multi-system audio intermediate frequency processing device according to claim 1, further comprising a carrier frequency converter for converting a frequency to 9.0 MHz. 4. An oscillator which oscillates a first reference signal having a predetermined frequency, and a first carrier frequency, which receives an audio intercarrier signal and uses the first reference signal supplied from the oscillator. A first FM having a frequency shift in a first range
First selecting means for selectively outputting a signal; a second carrier frequency different from the first carrier frequency for inputting the voice intercarrier signal;
Second selecting means for selectively outputting a second FM signal having a frequency deviation in a second range narrower than the above range, and the first FM signal output from the first selecting means for the first FM signal. An FM detector for inputting the second FM signal output from the second selecting means through a second path and detecting an FM signal having a predetermined carrier frequency; A frequency divider that is provided in the second path and divides the frequency of the first FM signal by a predetermined ratio to make the frequency deviation of the first FM signal approximately the same as the second range. , The second F provided in the first or second path
The first signal inputted to the FM detector is frequency mixed with the first FM signal and the second reference signal before or after being processed by the M signal or the frequency divider.
And a carrier frequency converter that converts the carrier frequency of the second FM signal so that the carrier frequency of the second FM signal becomes the same as the predetermined carrier frequency. 5. The voice intercarrier signal has a carrier frequency of 4.5 MHz, 5.5 MHz, 6.0 MH.
z and 6.5 MHz, and the carrier frequency is 4.5.
The frequency deviation of the FM signal of MHz includes an FM signal of about half of the FM signals of the carrier frequencies of 5.5 MHz, 6.0 MHz and 6.5 MHz, and the oscillator includes a first reference signal having a frequency of 500 KHz. An oscillator that oscillates, wherein the first selecting unit has the carrier frequency of 5.5 MH
means for filtering only the FM signals of z, 6.0 MHz and 6.5 MHz, and the first FM by converting their carrier frequencies to 6.0 MHz using the first reference signal.
The second selection means includes means for filtering only an FM signal having a carrier frequency of 4.5 MHz and selectively outputting the second FM signal as the second FM signal, wherein the FM detector is , An FM detector for detecting an FM signal having a carrier frequency of 4.5 MHz, wherein the frequency divider divides the frequency of the first FM signal by half.
The frequency deviation of the first FM signal by dividing the frequency deviation into the second frequency
Of the first FM, the carrier frequency converter being provided in the first path, before or after being processed by the frequency divider. 5. A carrier frequency converter for performing frequency mixing of a signal and the second reference signal and converting a carrier frequency of the first FM signal input to the FM detector to 4.5 MHz. Multi-system audio intermediate frequency processor. 6. The voice intercarrier signal has a carrier frequency of 4.5 MHz, 5.5 MHz and 6.0 MH.
z and 6.5 MHz, and the carrier frequency is 4.5.
The frequency deviation of the FM signal of MHz includes an FM signal of about half of the FM signals of the carrier frequencies of 5.5 MHz, 6.0 MHz and 6.5 MHz, and the oscillator includes a first reference signal having a frequency of 500 KHz. An oscillator that oscillates, wherein the first selecting unit has the carrier frequency of 5.5 MH
means for filtering only the FM signals of z, 6.0 MHz and 6.5 MHz, and the first FM signal by converting the carrier frequency of the filtered FM signal to 6.0 MHz using the first reference signal. And a means for outputting as the carrier frequency of 4.5 MHz.
and a means for selectively outputting only the FM signal of z and outputting as the second FM signal, wherein the FM detector is an FM detector for detecting an FM signal having a carrier frequency of 3.0 MHz. And the frequency divider divides the frequency of the first FM signal by half.
The frequency deviation of the first FM signal by dividing the frequency deviation into the second frequency
And a carrier frequency converter provided in the second path for performing frequency mixing of the second FM signal and the second reference signal, The multi-system audio intermediate frequency processing device according to claim 4, further comprising a carrier frequency converter that converts a carrier frequency of the second FM signal input to the FM detector into 3.0 MHz. 7. A first FM signal having a carrier frequency of 4.5 MHz, a second FM signal having a carrier frequency of 5.5 MHz, and a 6.0 MHz among input audio intercarrier signals.
Signal selecting means for selectively outputting the third FM signal and the fourth FM signal of 6.5 MHz, an oscillator for oscillating a reference signal having a frequency of 5 MHz, an output of the signal selecting means and the A frequency mixer that inputs an output of an oscillator and mixes the first to fourth FM signals with the reference signal; and inputs the output of the frequency mixer, and outputs the first and the second output from the frequency mixing. The frequency of the second FM signal is set to 6
3 times the frequency of the third FM signal,
A multi-system audio intermediate frequency processing device comprising: a multiplier that doubles the frequency of the M signal; and an FM detector that receives the output of the multiplier and detects an FM signal having a carrier frequency of 3 MHz. 8. An audio intercarrier signal is input, and a first FM signal having a carrier frequency of 4.5 MHz and 5.
Second FM signal of 5 MHz and third F signal of 6.0 MHz
A signal selecting means for selectively outputting the M signal and the fourth FM signal of 6.5 MHz; an oscillator for oscillating a reference signal having a frequency of 5 MHz; and an output of the signal selecting means and an output of the oscillator. A frequency mixer for inputting and mixing the first to fourth FM signals and the reference signal, and a phase locked loop for inputting the output of the frequency mixer and performing FM detection based on the 3 MHz reference signal A multi-system audio intermediate frequency processing device, comprising: