JP2920030B2 - Multi-method audio intermediate frequency processor - Google Patents

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 for, for example, a television or a VTR, and more particularly to a technique for simplifying a multi-system audio intermediate frequency processing device.

[0002]

2. Description of the Related Art In recent years, in audio intermediate frequency processing circuits,
In many cases, a multi-method that can cope with a different standard depending on each region is 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 apparatus.

In FIG. 1, reference numeral 1 denotes an input terminal to which an audio intercarrier signal is input, 2 denotes a ceramic filter having one end connected to the input terminal 1 and passes an FM signal having a carrier frequency of 5.5 MHz, and 3 denotes an input terminal. A ceramic filter connected to terminal 1 and passing an FM signal having a carrier frequency of 6.0 MHz, a ceramic filter 4 having one end connected to input terminal 1 and passing an FM signal having a carrier frequency of 6.5 MHz, and 6 for 500 KHz Oscillator,
Reference numeral 5 denotes a local oscillator which is connected to the oscillator 6 and outputs a reference signal having a frequency of 500 KHz. Reference numeral 7 is connected to the local oscillator 5 and the other end of the ceramic filters 2 to 4. 6.0 MHz and 6.
8 is a frequency mixer that performs frequency mixing with an FM signal having a carrier frequency of 5 MHz, 8 is a ceramic filter having 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. And a filter 13 having the same characteristics as the ceramic filter 3.
A switch connected to the other end of the filter and the ceramic filter 14 for selectively outputting only one output. Reference numeral 15 is connected to the switch 13 so that the carrier frequency is 4.5.
MHz or 6.0 MHz, and an FM detector 16 is connected to the FM detector 15 to detect the FM signal.
A resonance circuit that tunes to the carrier frequency of the signal; 17 is an output terminal for outputting a detection result; 19 and 20 are changeover switches that turn on and off in conjunction with the changeover switch 13;
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 convert the audio intercarrier signal into an F-wave having a carrier frequency of 6.0 MHz.
The selector SE1 outputs the M signal. The ceramic filter 8 constitutes a selecting means SE2 for selectively outputting 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 converted to 5.5 MHz, 6.0 MHz,
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. The FM signal having the carrier frequency of 5.5 MHz and 6.5 MHz output from the frequency mixer 7 is frequency-converted, and 6.
It becomes an FM signal having a carrier frequency of 0 MHz. After adding the FM signal obtained by converting the carrier frequency and the FM signal having the carrier frequency of 6.0 MHz transmitted through the ceramic filter 3, the filter 1 for 6.0 MHz is added.
In step 4, only 6.0 MHz is passed and 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 supplied to the terminal b of the changeover switch 13.
Is input to Then, an FM signal having a carrier frequency of 4.5 MHz and a carrier frequency of 6.0 M
Switching to the FM signal of 1 Hz is performed, and one of the FM signals is input to the FM detector 15. Now, assuming that the terminal a of the switch 13 is connected, an FM signal of 6.0 MHz is input to the FM detector 15. The resonance circuit 16 of the FM detector 15 is adjusted to detect a 6.0 MHz FM signal. 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 output from the FM detector 15 is
The signal is divided by the resistors 21 and 22 and output from the output terminal 17. Next, when the changeover switch 13 is moved to the terminal b side, 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 5 MHz. At the same time, the changeover switch 20 is also connected to the terminal b.
Is connected, and the output is not directly divided by the resistor but directly output to the resistor 17 through the resistor 21.

[0005] As described above, the carrier frequency is 5.5 MHz.
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 is automatically set to a carrier frequency of 6.0 MHz.
It is detected as z. When the frequency is 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 of the same level as the above-mentioned FM signal is obtained.
A detection output can be obtained.

Here, the frequency at which FM detection is performed is 6.0M.
The reason why the frequency is divided by the resistors 21 and 22 when the frequency is Hz is that only the FM signal having the carrier frequency of 4.5 MHz has a frequency deviation of ±
The frequency is 25 KHz, the others are doubled to ± 50 KHz, and it is necessary to match the audio output level between the FM signal of the carrier frequency of 4.5 MHz and the other three signals.

[0007]

Since the conventional multi-system audio intermediate frequency processing apparatus is configured 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 problems, and can reduce the number of changeover switches.
It is an object of the present invention to obtain an inexpensive multi-method audio intermediate frequency processing device 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 apparatus, comprising: an oscillator for oscillating a first reference signal having a predetermined frequency; First selecting means for selectively outputting a first FM signal having a first carrier frequency and a first range of frequency deviation using the first reference signal provided by the first reference signal; An inter-carrier signal is input, and a second FM signal having a second carrier frequency different from the first carrier frequency and a second FM signal having a frequency shift in a second range narrower than the first range is selectively output. And the first FM signal output from the first selection means is input through a first path, and the second FM signal output from the second selection means is input to a second path. Type through the path of FM having a predetermined carrier frequency
An FM detector for detecting a signal, the frequency detector being provided in the second path, multiplying a frequency of the second FM signal by a predetermined ratio to reduce a frequency shift of the second FM signal to the first frequency. A multiplier provided in the first or second path, the second FM signal being provided before or after being processed by the first FM signal or the multiplier; And a second reference signal, and performs carrier frequency conversion 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.

In a 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, 5.5 MHz,
The frequency shift of the FM signal of 6.0 MHz and 6.5 MHz and the carrier frequency of 4.5 MHz is caused by the carrier frequency of 5.5 MHz, 6.0 MHz and 6.5 MHz.
, The oscillator includes an oscillator that oscillates a first reference signal having a frequency of 500 KHz, and the first selecting means includes a carrier frequency of 5.5 MHz, 6. 0 MHz and 6.5 MH
5. means for filtering only the FM signal of z, and using the first reference signal to determine the carrier frequency of the filtered FM signal.
Means for converting the signal into 0 MHz and outputting the first FM signal as the first FM signal, wherein the second selecting means filters only the FM signal having the carrier frequency of 4.5 MHz and selectively outputs the second FM signal as the second FM signal. 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, wherein the frequency multiplier doubles a frequency of the second FM signal to generate the second FM signal.
A frequency shifter for making the frequency shift of the FM signal equal to the first range, wherein the carrier frequency converter is provided in the second path and before or after processing by the multiplier. Carrier frequency conversion for performing frequency mixing of the second FM signal and the second reference signal after being subjected to the frequency conversion and converting the carrier frequency of the second FM signal input to the FM detector to 6.0 MHz. This is an embodiment including a vessel.

In another preferred aspect of the multi-system audio intermediate frequency processing apparatus according to the first invention, the audio intercarrier signal has a carrier frequency of 4.5 MHz, 5.5 MHz.
z, 6.0 MHz and 6.5 MHz, and the frequency shift of the FM signal having the carrier frequency of 4.5 MHz corresponds to the carrier frequency of 5.5 MHz, 6.0 MHz and 6.5 M.
Hz, the oscillator includes an oscillator that oscillates a first reference signal having a frequency of 500 KHz, and the first selection means includes an oscillator that oscillates a carrier frequency of 5.5 MHz, 6 MHz. 2.0MHz and 6.5M
Hz means for filtering only the FM signal, and the filtered FM signal.
Means for converting the carrier frequency of the signal to 6.0 MHz using the first reference signal, and outputting the converted signal as the first FM signal; Means for filtering only an FM signal and selectively outputting the second FM signal as the second FM signal, wherein the FM detector includes an FM detector for detecting an FM signal having a carrier frequency of 9.0 MHz; The frequency multiplier includes a frequency multiplier that doubles the frequency of the second FM signal to make the frequency shift of the second FM signal approximately the same as the first range. A frequency mixing unit that is provided in the first path and mixes the first FM signal and the second reference signal;
This is a mode including a carrier frequency converter that converts 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 apparatus which receives an oscillator for oscillating a first reference signal having a predetermined frequency, and an audio intercarrier signal, and receives the first signal from the oscillator. A first selecting means for selectively outputting a first FM signal having a first carrier frequency and a first range of frequency deviation by 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 first carrier frequency and a second range of frequency shift narrower than the first range; and The first FM signal output from the selection means is input through a first path, the second FM signal output from the second selection means is input through a second path, and a predetermined carrier frequency is input. An FM detector for detecting an FM signal having: a first path provided in the first path;
A frequency divider that divides the frequency of the FM signal at a predetermined rate to make the frequency shift of the first FM signal approximately the same as the second range; and a frequency divider in the first or second path. And performs frequency mixing of the first FM signal and the second reference signal before or after being processed by the second FM signal or the frequency divider, and inputs the mixed signal to the FM detector. And a carrier frequency converter for converting a carrier frequency of the first and second FM signals to be the same as the predetermined carrier frequency.

In a preferred aspect of the multi-system audio intermediate frequency processing apparatus according to the second invention, the audio intercarrier signal has a carrier frequency of 4.5 MHz, 5.5 MHz,
The frequency shift of the FM signal of 6.0 MHz and 6.5 MHz and the carrier frequency of 4.5 MHz is caused by the carrier frequency of 5.5 MHz, 6.0 MHz and 6.5 MHz.
, The oscillator includes an oscillator that oscillates a first reference signal having a frequency of 500 KHz, and the first selecting means includes a carrier frequency of 5.5 MHz, 6. 0 MHz and 6.5 MH
z means for filtering only the FM signal of z, and means for converting their carrier frequency to 6.0 MHz using the first reference signal and outputting the same as the first FM signal,
The second selection means is configured to control the carrier frequency to be 4.5 MH.
3. means for filtering only the FM signal of z and selectively outputting as the second FM signal;
An FM detector for detecting an FM signal having a carrier frequency of 5 MHz, wherein the frequency divider includes the first F
A frequency divider that divides the frequency of the M signal by half to make the frequency shift of the first FM signal approximately the same as the second range, wherein the carrier frequency converter is The first FM signal and the second reference signal, which are provided in the first path and before or after being processed by the frequency divider, are mixed and input to the FM detector. The first
Is a mode including a carrier frequency converter for converting 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, 5.5 MHz.
z, 6.0 MHz and 6.5 MHz, and the frequency shift of the FM signal having the carrier frequency of 4.5 MHz corresponds to the carrier frequency of 5.5 MHz, 6.0 MHz and 6.5 M.
Hz, the oscillator includes an oscillator that oscillates a first reference signal having a frequency of 500 KHz, and the first selection means includes an oscillator that oscillates a carrier frequency of 5.5 MHz, 6 MHz. 2.0MHz and 6.5M
Hz means for filtering only the FM signal, and the filtered FM signal.
Means for converting the carrier frequency of the signal to 6.0 MHz using the first reference signal, and outputting the converted signal as the first FM signal; Means for filtering only an FM signal and selectively outputting the second FM signal as the second FM signal, wherein the FM detector includes 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 and makes the frequency shift of the first FM signal approximately equal to the second range. , The carrier frequency converter is provided in the second path, and performs frequency mixing of the second FM signal and the second reference signal.
This is a mode including a carrier frequency converter that converts the carrier frequency of the second FM signal input to the detector to 3.0 MHz.

The multi-system audio intermediate frequency processing apparatus according to the third invention is characterized in that, among the input audio intercarrier signals, 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. Signal selecting means for selectively outputting an FM signal, a third FM signal of 6.0 MHz, and a fourth FM signal of 6.5 MHz; an oscillator for oscillating a reference signal having a frequency of 5 MHz; A frequency mixer for receiving the output of the signal selection means and the output of the oscillator, for mixing the first to fourth FM signals and the reference signal, and for receiving the output of the frequency mixer,
The frequency of the first and second FM signals output from the device is 6 times, the frequency of the third FM signal is 3 times,
And a FM detector that receives the output of the multiplier and detects an FM signal having a carrier frequency of 3 MHz.

A multi-system audio intermediate frequency processing apparatus according to a fourth aspect of the present invention receives an audio intercarrier signal, and inputs a first FM signal having a carrier frequency of 4.5 MHz and 5.5 MHz.
signal selecting means for selectively outputting a second FM signal of z, a third FM signal of 6.0 MHz, and a fourth FM signal of 6.5 MHz, and oscillating a reference signal having a frequency of 5 MHz. An oscillator to be input, an output of the signal selection means and an output of the oscillator, 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 3 MHz reference frequency
And a detector.

[0017]

The frequency multiplier of the first invention multiplies the frequency of the second FM signal by a predetermined ratio to make the frequency shift of the second FM signal approximately the same as the first range. Then, the carrier frequency converter converts the first and second signals input to the FM detector.
Since the carrier frequency is converted such 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 shift, and the FM detector adjusts switching means for coping with a plurality of carrier frequencies and a plurality of frequency shifts, and a frequency to be detected. The resonance circuit and the like can be simplified.

The frequency divider according to the second aspect of the present invention comprises a first FM
The frequency of the signal is divided by a predetermined ratio to make the frequency shift of the first FM signal approximately the same as 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 has to correspond to one carrier frequency and one frequency shift. The FM detector determines switching means for coping with a plurality of carrier frequencies and a plurality of frequency shifts, and a frequency to be detected. The resonance circuit and the like can be simplified.

The frequency mixer according to the third aspect of the present invention has a first
By mixing the fourth to fourth FM signals and the reference signal,
An FM signal having a carrier frequency of 0.5 MHz;
FM signal with 0MHz carrier frequency and 1.5M
And an FM signal having a carrier frequency of 1 Hz. Then, the frequency multiplier of these output FM signals is 6 times,
The frequency is multiplied by 3 and 2 to output an FM signal having a carrier frequency of 3.0 MHz. Therefore, the FM detector has a function of 3.
Since it is only necessary to detect the FM signal having the carrier frequency of 0 MHz, the configuration can be simplified.

In the fourth invention, the phase locked
The loop-type FM detector mixes the first to fourth FM signals with the reference signal and outputs a 0.
FM signals having carrier frequencies of 5 MHz, 1.0 MHz, and 1.5 MHz are input. Since the carrier frequency of each FM signal is an integer fraction of 3 MHz, FM detection is performed based on a 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. FIG. 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. FIG.
, 9a is connected to the local oscillator 5 and doubles the frequency of the input signal by 2; 9b is a doubler 9
a which is connected to a and doubles the frequency of the input signal.
The frequency multiplier 10 is connected to the frequency multipliers 9a and 9b, the frequency mixer for mixing the outputs of the frequency multipliers 9a and 9b to output a 3 MHz reference signal, and 9c is connected to the other end of the ceramic filter 8. 4.5M input carrier frequency
The frequency doubler 12 doubles the frequency of the FM signal of 2 Hz. The input 12 receives the output of the frequency doubler 9c and the output of the frequency mixer 10 and mixes these signals.
This is a frequency mixer for converting the carrier frequency of the M signal, and the same reference numerals as in FIG. 10 denote the same or corresponding parts as in FIG. Here, the doublers 9a to 9c and the frequency mixers 10 and 12 constitute a carrier frequency conversion means CO1 for converting a carrier frequency.

Next, the operation will be described. Selection means SE
In 1, the operation of processing an FM signal having a carrier frequency of 5.5 to 6.5 MHz is exactly the same as that of the conventional multi-system audio intermediate frequency processing apparatus 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 shift is also doubled to ± 50K.
Hz. This is input to the frequency mixer 12. On the other hand, the 500 KHz reference signal output of the local oscillator 5 is converted to 1 MHz by the doubler 9a, and further converted to 2MHz by the cascade-connected 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. The 3 MHz reference signal is input to the other terminal of the frequency mixer 12, and the 9.0 MHz input from the doubler 9c is input.
The frequency conversion of the FM signal having the z carrier frequency is performed at 3.0 MHz, and the FM signal having the carrier frequency of 6.0 MHz is performed.
Convert to a signal. Accordingly, the changeover switch 13 operates in the same manner as the conventional example, but the 6.0M
Hz ceramic filter 14 is connected, and all voice intercarrier signals are converted to a frequency of 6.0 MHz and a frequency shift of ± 50 KHz , and the FM detector 15
Since the signal is input to a, the trimmer capacitor 18 and the resistors 21 and 22 which are conventionally required become unnecessary, and the changeover switch 19 of the resonance circuit 16a 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 a configuration of a multi-method audio intermediate frequency processing device according to a second embodiment of the present invention. In FIG. 2, reference numeral 23 denotes a ceramic filter that passes an FM signal having a carrier frequency of 3.0 MHz,
The same reference numerals as those in FIG. 1 denote the same or corresponding parts as in FIG. The multi-system audio intermediate frequency processing device shown in FIG.
6.0M as in the multi-method audio intermediate frequency processing device
FM signal having a carrier frequency of 15 Hz
It is configured to detect at a. The difference between the multi-method audio intermediate frequency processing device shown in FIG. 2 and the multi-method audio intermediate frequency processing device shown in FIG. 1 is that the FM signal having a carrier frequency of 4.5 MHz output from the ceramic filter 8 is converted into frequency conversion means. Carrier frequency 3.0MH at CO2
z, and the FM signal is doubled by a doubler 9c to obtain a carrier frequency of 6.0 MHz and a frequency shift ±
The point is that an FM signal of 50 KHz is used. Note that the frequency conversion means CO2 outputs 50
Doubler 9a for doubling the frequency of a reference signal of 0 KHz
A frequency mixer 10 that mixes 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.
And a ceramic filter 23 that passes only the FM signal output from the frequency mixer 12 having a 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 a configuration of a multi-method audio intermediate frequency processing device according to a third embodiment of the present invention. In FIG. 3, reference numeral 24 designates either the output of the local oscillator 5 or the output of the frequency mixer 10 to selectively use the frequency mixer 7a.
The same reference numerals as those in FIG. 1 denote the same or corresponding parts as those in FIG. FIG.
The multi-method audio intermediate frequency processing device shown in FIG. 1 is configured to detect an FM signal having a carrier frequency of 6.0 MHz by the FM detector 15a, similarly to the multi-method audio intermediate frequency processing device shown in FIG. The difference between the multi-method audio intermediate frequency processing device shown in FIG. 3 and the multi-method audio intermediate frequency processing device shown in FIG. 1 is that the 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 frequency conversion means CO1, and this FM signal is doubled by a 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 a configuration of a multi-method audio intermediate frequency processing device according to a fourth embodiment of the present invention. In FIG. 4, reference numeral 25 designates the frequency of the input signal as a half.
分 frequency divider, 15b has a carrier frequency of 4.5M
The FM detector for detecting the FM signal of 1 Hz, the resonance circuit 16b 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 parts as in FIG. The frequency conversion means CO3 doubles the frequency of the 500 KHz reference signal output from the local oscillator 5.
A multiplier 9a, a frequency mixer 10 for mixing the outputs of the local oscillator 5 and the doubler 9a, and a carrier frequency of 3.0 M that has passed through the output of the frequency mixer 10 and the 分 divider 25
The frequency mixer 12 mixes an FM signal with a frequency of 4.5 Hz and a ceramic filter 8 that allows only those having a carrier frequency of 4.5 MHz among the FM signals output from the frequency mixer 12 to pass therethrough. 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-method audio intermediate frequency processing apparatus according to the fourth embodiment will be described. In the multi-method audio intermediate frequency processing device of the fourth embodiment, 1.5 times as in the second embodiment.
A reference signal of MHz is generated and output from the frequency mixer 10. On the other hand, the FM signal of 5.5 to 6.5 MHz is also converted to the carrier frequency of 6.0 MHz as in the second embodiment.
Obtained through a filter 14 for 6.0 MHz;
An FM signal having a carrier frequency of 0 MHz is frequency-divided by a 1/2 frequency divider 25 and converted to 3.0 MHz. At this time, the frequency shift also changes from ± 50 KHz to ± 25 KHz and is input to the frequency mixer 26. Here, the frequency mixer 12 converts the frequency of the 3.0 MHz FM signal using a 1.5 MHz reference signal, becomes a carrier frequency of 4.5 MHz, and inputs the carrier frequency to the terminal a of the switch 13.
The input signal from the input terminal 1 is directly input to the terminal b of the changeover switch 13, and is FM-detected by the FM detector 15 b connected to the 4.5 MHz resonance circuit 16 b through the 4.5 MHz ceramic filter 8. Therefore, the conventionally required trimmer capacitor 18, resistors 21, 22
Is unnecessary, and the changeover switch 19 of the resonance circuit 16a and the changeover switch 20 for adjusting the audio 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 a configuration of a multi-method audio intermediate frequency processing device according to a fifth embodiment of the present invention. 5, the same reference numerals as those in FIG. 4 denote the same or corresponding parts as in FIG. The multi-method audio intermediate frequency processing apparatus 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-method audio intermediate frequency processing apparatus shown in FIG. I have. The difference between the multi-method audio intermediate frequency processing device shown in FIG. 5 and the multi-method audio intermediate frequency processing device shown in FIG. 4 is that the FM signal having a carrier frequency of 6.0 MHz output from the ceramic filter 14 is converted into frequency conversion means. It is converted into an FM signal having a carrier frequency of 9.0 MHz by CO4, and this FM signal is
The frequency is divided by the 2 frequency divider 25 and the carrier frequency is 4.5 MHz.
z, frequency deviation ± 25 KHz. The frequency conversion means CO4 is provided with a doubler 9a for doubling the frequency of the 500 KHz reference signal output from the local oscillator 5 and an output of the doubler 9a to increase the frequency by 2
A frequency doubler 9b for doubling the frequency, a frequency mixer 10 for mixing the outputs of the frequency doublers 9a and 9b, and an output of the frequency mixer 10 and an FM signal having a carrier frequency of 6.0 MHz passed through the ceramic filter 14. Frequency mixer 12
And 4.5 of the FM signal output from the frequency mixer 12.
It comprises a ceramic filter 8 that 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 a configuration of a multi-method audio intermediate frequency processing device according to a sixth embodiment of the present invention. In FIG. 6, 15c is the F of the carrier frequency of 3.0 MHz.
An FM detector for detecting the M signal, 16c is an FM detector 15
A resonance circuit for adjusting the detection frequency of c, a ceramic filter 27 for passing an FM signal having a carrier frequency of 3.0 MHz, and the same reference numerals as in FIG. 2 indicate the same or corresponding parts as in FIG. The frequency conversion means CO5 includes a doubler 9a for doubling the frequency of the 500 KHz reference signal output from the local oscillator 5, a frequency mixer 10 for mixing the outputs of the local oscillator 5 and the doubler 9a, A frequency mixer 12 for mixing an output of the frequency mixer 10 and an FM signal having a carrier frequency of 4.5 MHz, which is an output of the selecting means SE2, and a carrier frequency of 3.0 KHz among the FM signals output from the frequency mixer 12 It is composed of a ceramic filter 27 that allows only what it has to pass.

The operation of the multi-system audio intermediate frequency processing device will be described. In the multi-method audio intermediate frequency processing device of the sixth embodiment, a reference signal of 1.5 MHz is generated in the same manner as in the fourth embodiment, and output from the frequency mixer 10. On the other hand, an FM signal having a carrier frequency of 5.5 to 6.5 MHz is also converted to 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 分 frequency divider 25. At this time, the frequency shift is also ± 50K
Hz to ± 25 KHz. On the other hand, the frequency mixer 12 converts the frequency of the 4.5 MHz FM signal output from the ceramic filter 8 using a 1.5 MHz reference signal, and converts the frequency to a carrier frequency of 3.0 MHz. Is input to The output from the frequency divider 25 is directly input to a terminal a of the changeover switch 13, and the 3.0 MHz ceramic filter 2
7, and is FM-detected by an FM detector 15c connected to a resonance circuit 16c for 3.0 MHz. Therefore, the conventionally required trimmer capacitor 18 and resistors 21 and 22 are unnecessary, and the switch 19 of the resonance circuit 16a and the switch 20 for adjusting the audio 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 a configuration of a multi-method audio intermediate frequency processing device according to a 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, a resonance circuit 16d for determining a detection frequency of the FM detector 15d, a ceramic filter 28 for passing an FM signal having a carrier frequency of 9.0 MHz, and the same reference numerals as those in FIG. 2 shows the same or corresponding parts as in FIG. The frequency conversion means CO6
A doubler 9a for doubling the frequency of the 500 KHz reference signal output from the local oscillator 5, a doubler 9b for doubling the frequency of the signal output from the doubler 9a,
Frequency mixer 10 for mixing the outputs of doublers 9a and 9b
And the output of the frequency mixer 10 and the ceramic filter 1
4, a frequency mixer 12 for mixing an FM signal having a carrier frequency of 6.0 MHz, and a ceramic filter 28 for passing only the FM signal output from the frequency mixer 12 having a carrier frequency of 9.0 KHz.
It is composed of

The operation of the multi-method audio intermediate frequency processing device will be described. In the multi-method audio intermediate frequency processing device of the seventh embodiment, a 3.0 MHz reference signal is generated and output from the frequency mixer 10 in the same manner as in the first embodiment. On the other hand, an FM signal having a carrier frequency of 5.5 to 6.5 MHz is also converted to a carrier frequency of 6.0 MHz as in the first embodiment.
The frequency filter 12 allows the ceramic filter 14
6.0MHz FM signal 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 4.5 MHz filter 8 is converted to 9.0 MHz by the doubler 9c. At this time, the frequency shift is also ±
It is ± 50 KHz from 25 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. Accordingly, the changeover switch 19 of the resonance circuit 16a and the changeover switch 20 for adjusting the audio 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 a configuration of a multi-method audio intermediate frequency processing device according to an eighth embodiment of the present invention. In FIG. 8, 6a is a 5 MHz oscillator, 5a is a local oscillator connected to the oscillator 6a and oscillates a 5 MHz reference signal, 7 is connected to the local oscillator 5a, and is output from the ceramic filters 2-4 and 8. Carrier frequency 4.5
MHz, 5.5MHz , 6.0MHz and 6.5MHz
MU1 is a frequency mixer for mixing the FM signal and the reference signal of 5 MHz , and MU1 is a multiplier for increasing the frequency of the output signal output from the frequency mixer 7 to 2, 3, and 6 times.
Converts an FM signal having a carrier frequency of 3.0 MHz to F
The FM detector 16c for M detection, 16c is a resonance circuit for determining the detection frequency in the FM detector 15c, and the same reference numerals as those in FIG. 1 denote the same or corresponding parts in FIG. Note that the carrier frequency is 4.5 MHz, 5.5 MH
The selecting means SE3 for selectively outputting the FM signals of z, 6.5 MHz and 6.5 MHz includes ceramic filters 2 to 3.
4 and 8. Further, the multiplying means MU1 comprises an amplitude limiter 30 and a bandpass filter 31 for 3 MHz. That is, the required carrier frequency of 3.0 MH among the harmonics of the input signal generated by the amplitude limiter 30
By passing only the FM signal of z, 0.5 MHz,
It is a multiplying 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 supplied to the selection means SE3.
And the carrier frequency is 4.5-6.5M
Hz only the FM signal is output. In the frequency mixer 7, these FM signals are mixed with a 5 MHz reference signal output from the local oscillator 5 a,
It is converted into an FM signal having a carrier frequency of 1.5 MHz and 1.5 MHz. Then, the amplitude of these converted FM signals is limited by an 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,
A signal of 3 MHz obtained by doubling 1.5 MHz is included. From the generated harmonics, only the FM signal having the carrier frequency detected by the FM detector is subjected to the bandpass filter 31.
, And is detected and output by the FM detector 15c. Therefore, compared with the conventional multi-method audio intermediate frequency processing device, the trimmer capacitor 1 has a simpler configuration and is conventionally required.
8. The changeover switch 19 can be omitted, and a 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 configuration of a multi-method audio intermediate frequency processing device according to a ninth embodiment of the present invention. In FIG. 9, reference numeral 15e denotes an FM detector that detects an input FM signal based on a 3.0 MHz reference signal by using a phase locked loop method, and 32 denotes an FM detector 15
Reference numeral e denotes a resistor for adjusting the detection frequency, and other reference numerals that are the same as those in FIG. 8 denote parts that are the same as or correspond to those in FIG.

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

[0036]

As described above, according to the multi-system audio intermediate frequency processing apparatus of the first aspect of the present invention, the frequency of the second FM signal provided in the second path is multiplied at a predetermined rate. A frequency multiplier for making the frequency shift of the second FM signal approximately the same as the first range, and a frequency multiplier provided in the first or second path before being processed by the first FM signal or the frequency multiplier. 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 a predetermined carrier frequency. And a carrier frequency converter that converts the carrier frequency so that the following equation is obtained. In the FM converter, the audio intercarrier signal input to the input terminal is converted to 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 reducing the cost of the device.

According to the second aspect of the present invention, the frequency multiplier doubles the frequency of the second FM signal to reduce the frequency shift of the second FM signal to the first frequency. And a carrier frequency converter provided in the second path, the second FM signal and the second reference signal before or after being processed by the multiplier. And the second FM input to the FM detector
Since it is configured to include a carrier frequency converter for converting the carrier frequency of the signal to 6.0 MHz, FM
In the converter, the audio 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 can be processed according to an actual standard. With a simple configuration, there is an effect that the device can be simplified and the device suitable for integration can be simplified by omitting the changeover switch and the like. This also has the effect of reducing the cost of the device.

According to the third aspect of the present invention, the frequency multiplier doubles the frequency of the second FM signal to reduce the frequency shift of the second FM signal to the first frequency. A carrier frequency converter is provided in a first path, performs frequency mixing of a first FM signal and a second reference signal, and performs frequency mixing of the first FM signal and the second reference signal. The carrier frequency of the first FM signal input to the
Since it is configured so as to include a carrier frequency converter for converting into z, the FM converter converts the audio intercarrier signal input to the input terminal to a carrier frequency of 9.0 MHz and a frequency deviation in the first range. FM with transfer
Signals can be processed, and there is an effect that the device can be simplified and a device suitable for integration can be simplified by omitting a changeover switch or the like with a simple configuration corresponding to an actual standard. This also has the effect of reducing the cost of the device.

According to the multi-speech audio intermediate frequency processing apparatus of the invention described in claim 4, it is provided in the first path , and the first F
A frequency divider that divides the frequency of the M signal by a predetermined ratio to make the frequency shift of the first FM signal approximately the same as the second range, and a frequency divider that is provided in the first or second path; 2 before or after being processed by the FM signal or the frequency divider.
Of the FM signal and the second reference signal.
And a carrier frequency converter for converting the carrier frequency so that the carrier frequencies of the first and second FM signals input to the M detector become the same as the predetermined carrier frequency. In the converter, an audio intercarrier signal input to an input terminal is converted to an F signal having the same carrier frequency and having a frequency shift in a first range.
The signal can be processed as an M signal, and there is an effect that the device can be simplified and a device suitable for integration can be omitted by omitting a changeover switch and the like. This also has the effect of reducing the cost of the device.

According to the fifth aspect of the invention, the frequency divider divides the frequency of the first FM signal by half to reduce the frequency of the first FM signal. A frequency divider for making the deviation comparable to the second range, wherein the carrier frequency converter is provided in the first path and is provided with a first frequency before or after being processed by the frequency divider. 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. , The FM converter can process the audio intercarrier signal input to the input terminal as an FM signal having a carrier frequency of 4.5 MHz and having a frequency deviation in the second range, and can correspond to an actual standard. Switch 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 reducing the cost of the device.

According to the sixth aspect of the present invention, the frequency divider divides the frequency of the first FM signal by half to reduce the frequency of the first FM signal. A frequency divider for making the shift approximately the same as the second range, wherein the carrier frequency converter is provided in the second path and performs frequency mixing of 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
Hz, the FM converter includes a carrier frequency converter that converts the audio intercarrier signal input to the input terminal into a carrier frequency of 3.0 MHz and a frequency deviation in the second range. F with transfer
It can be processed as an M signal, and has an effect that the device can be simplified with a simple configuration corresponding to the actual standard, and the device can be simplified by omitting a changeover switch and the like, thereby making it suitable for integration. This also has the effect of reducing the cost of the device.

According to the seventh aspect of the present invention, the oscillator for oscillating the reference signal having the frequency of 5 MHz, the output of the signal selecting means and the output of the oscillator are inputted, Since the frequency converter is provided with a frequency mixer for mixing the fourth FM signal and the reference signal, the FM signal output from the frequency mixer is easily multiplied by the multiplier to provide an input terminal for the FM converter. Can be processed as an FM signal having a carrier frequency of 3.0 MHz, and has a simple configuration corresponding to an actual standard, simplifies the device by omitting a changeover switch, etc., and integrates There is an effect that it can be suitable for the conversion. This also has the effect of reducing the cost of the device.

According to the multi-system audio intermediate frequency processing apparatus of the invention, an oscillator for oscillating a reference signal having a frequency of 5 MHz, an output of the signal selecting means and an output of the oscillator are inputted, and A frequency mixer that mixes the fourth FM signal and the reference signal; and a phase locked loop type FM detector that receives an output of the frequency mixer and performs FM detection based on a 3 MHz reference frequency. Therefore, even if FM signals with different carrier frequencies are input to the FM converter, each frequency is 3 MHz.
Since the frequency of the reference signal is not switched in accordance with the frequency, the configuration is simple in accordance with the actual standard, the switching device is omitted, and the device is simplified and integrated. There is an effect that it can be suitable. This also has the effect of reducing the cost of the device.

[Brief description of the drawings]

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

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

FIG. 8 is a block diagram showing a configuration of a multi-method 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-method 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-method audio intermediate frequency processing device.

[Explanation of symbols]

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

Claims (8)

(57) [Claims] An oscillator that oscillates a first reference signal having a predetermined frequency, an audio intercarrier signal is input, and a first carrier frequency is determined by using the first reference signal provided from the oscillator. A first FM having a first range of frequency shifts
First selecting means for selectively outputting a signal; and inputting the audio intercarrier signal, a second carrier frequency different from the first carrier frequency, and the first
A second selecting means for selectively outputting a second FM signal having a frequency deviation in a second range narrower than the range, and a first FM signal outputted from the first selecting means. An FM detector that inputs through a first path, inputs the second FM signal output from the second selecting unit through a second path, and detects an FM signal having a predetermined carrier frequency; A frequency multiplier that is provided in the second path and that multiplies the frequency of the second FM signal at a predetermined rate to make the frequency shift of the second FM signal approximately the same as the first range; Provided in the first or second path, wherein the first F
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 the first FM signal input to the FM detector
And a carrier frequency converter that converts the carrier frequency so that the carrier frequency of the second FM signal is the same as the predetermined carrier frequency. 2. The voice intercarrier signal has a carrier frequency of 4.5 MHz, 5.5 MHz, and 6.0 MHz.
z and 6.5 MHz and the carrier frequency 4.5
The frequency deviation of the FM signal of MHz includes about half the frequency of the FM signal of 5.5 MHz, 6.0 MHz and 6.5 MHz, and the oscillator generates a first reference signal having a frequency of 500 KHz. An oscillator that oscillates, wherein the first selecting means includes a carrier frequency of 5.5 MHz.
means for filtering only the FM signals of z, 6.0 MHz and 6.5 MHz, and converting the carrier frequency of the filtered FM signal to 6.0 MHz using the first reference signal to convert the first FM signal to the first FM signal. Means for outputting the carrier frequency as 4.5 MH.
z means for filtering only the FM signal of z and selectively outputting it as the second FM signal, wherein the FM detector comprises an FM detector for detecting an FM signal having a carrier frequency of 6.0 MHz. Wherein the frequency multiplier includes a frequency multiplier for doubling the frequency of the second FM signal to make the frequency shift of the second FM signal approximately the same as the first range. A second mixer that is provided in the second path and performs frequency mixing of the second FM signal and the second reference signal before or after being processed by the multiplier; 2. The multi-method 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 device into 6.0 MHz. 3. The voice intercarrier signal has a carrier frequency of 4.5 MHz, 5.5 MHz, and 6.0 MHz.
z and 6.5 MHz and the carrier frequency 4.5
The frequency deviation of the FM signal of MHz includes about half the frequency of the FM signal of 5.5 MHz, 6.0 MHz and 6.5 MHz, and the oscillator generates a first reference signal having a frequency of 500 KHz. An oscillator that oscillates, wherein the first selecting means includes a carrier frequency of 5.5 MHz.
means for filtering only the FM signals of z, 6.0 MHz and 6.5 MHz, and converting the carrier frequency of the filtered FM signal to 6.0 MHz using the first reference signal to convert the first FM signal to the first FM signal. Means for outputting the carrier frequency as 4.5 MH.
z means for filtering only the FM signal of z and selectively outputting as the second FM signal, wherein the FM detector comprises an FM detector for detecting an FM signal having a carrier frequency of 9.0 MHz. The frequency multiplier includes a frequency multiplier that doubles the frequency of the second FM signal to make the frequency shift of the second FM signal approximately the same as the first range. The frequency converter is provided in the first path, performs frequency mixing of the first FM signal and the second reference signal, and performs a carrier of the first FM signal to be input to the FM detector. 2. 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 that oscillates a first reference signal having a predetermined frequency, and an audio intercarrier signal, and a first carrier frequency and a first carrier frequency are used by using the first reference signal provided from the oscillator. A first FM having a first range of frequency shifts
First selecting means for selectively outputting a signal; and inputting the audio intercarrier signal, a second carrier frequency different from the first carrier frequency, and the first
A second selecting means for selectively outputting a second FM signal having a frequency deviation in a second range narrower than the range, and a first FM signal outputted from the first selecting means. type through one path, the second of said second FM signal outputted from the selection means is inputted through the second path, and FM detector for detecting a FM signal having a predetermined carrier frequency, wherein the A frequency divider that is provided in the first path and divides the frequency of the first FM signal at a predetermined rate to make the frequency shift of the first FM signal approximately the same as the second range. , Provided in the first or second path, the second F
The frequency mixing of the first FM signal and the second reference signal before or after being processed by the M signal or the frequency divider is performed, and the first FM signal is input to the FM detector.
And a carrier frequency converter that converts the carrier frequency so that the carrier frequency of the second FM signal is the same as the predetermined carrier frequency. 5. The voice intercarrier signal has a carrier frequency of 4.5 MHz, 5.5 MHz, and 6.0 MHz.
z and 6.5 MHz and the carrier frequency 4.5
The frequency shift of the FM signal of MHz includes about half of the FM signal of the carrier frequency of 5.5 MHz, 6.0 MHz and 6.5 MHz, and the oscillator generates a first reference signal having a frequency of 500 KHz. An oscillator that oscillates, wherein the first selecting means includes a carrier frequency of 5.5 MHz.
means for filtering only the FM signals of z, 6.0 MHz and 6.5 MHz, and converting the carrier frequency to 6.0 MHz using the first reference signal to convert the carrier frequency to 6.0 MHz.
Means for outputting as a signal, the second selecting means includes means for filtering only an FM signal having a carrier frequency of 4.5 MHz and selectively outputting the same as the second FM signal, An FM detector for detecting an FM signal having a carrier frequency of 4.5 MHz, wherein the frequency divider reduces the frequency of the first FM signal by half.
And the frequency shift of the first FM signal is
The carrier frequency converter is provided in the first path, and the first FM before or after being processed by the frequency divider is provided. 5. The carrier according to claim 4, further comprising a carrier frequency converter that performs frequency mixing of a signal and the second reference signal and converts a carrier frequency of the first FM signal input to the FM detector to 4.5 MHz. Multi-method audio intermediate frequency processing device. 6. The voice intercarrier signal has a carrier frequency of 4.5 MHz, 5.5 MHz, and 6.0 MHz.
z and 6.5 MHz and the carrier frequency 4.5
The frequency deviation of the FM signal of MHz includes about half the frequency of the FM signal of 5.5 MHz, 6.0 MHz and 6.5 MHz, and the oscillator generates a first reference signal having a frequency of 500 KHz. An oscillator that oscillates, wherein the first selecting means includes a carrier frequency of 5.5 MHz.
means for filtering only the FM signals of z, 6.0 MHz and 6.5 MHz, and converting the carrier frequency of the filtered FM signal to 6.0 MHz using the first reference signal to convert the first FM signal to the first FM signal. Means for outputting the carrier frequency as 4.5 MH.
z means for filtering only the FM signal of z and selectively 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. Wherein the frequency divider divides the frequency of the first FM signal by half.
And the frequency shift of the first FM signal is
The carrier frequency converter is provided in the second path, performs frequency mixing of the second FM signal and the second reference signal, The multi-method 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 to 3.0 MHz. 7. A first FM signal having a carrier frequency of 4.5 MHz, a second FM signal having a 5.5 MHz frequency, and a 6.0 MHz signal among input voice intercarrier signals.
Signal selecting means for selectively outputting the third FM signal of the above and a 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 A frequency mixer that receives an output of an oscillator and mixes the first to fourth FM signals with the reference signal; and receives an output of the frequency mixer and receives a signal from the frequency mixer.
The frequency of et outputted first and second FM signal 6
Times the frequency of the third FM signal by three times,
A multi-method audio intermediate frequency processing device, comprising: a frequency multiplier for multiplying the frequency of an M signal by two times; and an FM detector for receiving an output of the frequency multiplier and detecting an FM signal having a carrier frequency of 3 MHz. 8. A first FM signal having a carrier frequency of 4.5 MHz, to which a voice intercarrier signal is inputted;
A 5 MHz second FM signal and a 6.0 MHz third FM signal
Signal selecting means for selectively outputting an M signal and a 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 that inputs and mixes the first to fourth FM signals and the reference signal; a phase locked loop that receives an output of the frequency mixer and performs FM detection based on a 3 MHz reference signal And a multi-method audio intermediate frequency processing device.