TW396680B - Radio receiver - Google Patents

Abstract

It is the object of the present invention to reduce the number of the outside part and to cut down the costs of the parts in case of when the circuit of the radio receiver is integrally formed on the semiconductor substrate. To receiver the FM broadcasting, a radio receiver 100 includes an antenna 19, a FM tuner section 1, a FM PLL circuit 2, a FM detection circuit 3, a FM stereo demodulation circuit 4, low frequency amplification circuits 101, 102 and speakers 103, 104. Also to receive the AM broadcasting, the radio receiver 100 includes an antenna 59, AM tuner portion section 5, a AM PLL circuit 6, a AM detection circuit 7, low frequency amplification circuit 105 and speaker 106. The FM PLL circuit 2 and the AM PLL circuit 6 output local oscillation signal based on the reference signal synchronized with a pilot signal outputted from the FM stereo demodulation circuit 4.

Description

V. Description of the invention (1) Technical field A7 B7 The Ministry of Economic Affairs, Central Bureau of Standards, Bureau of the Bayer Consumer Cooperative, issued the present invention 'is about-a radio (radio) equipped with an electronic tuning method and a stereo selection circuit Receiver). Technical background The receiving method of a radio receiver currently on the market is based on the superheterodyne receiving method. The super-heterodyne receiving method is to convert the frequency of the broadcast wave that is desired to be received into the center frequency of the band-pass wave filter without changing the frequency and band characteristics of the band-pass wave filter. Signaler. Frequency conversion 'is performed by mixing the received signal amplified by the high frequency and the local oscillation signal according to the instruction of the selection station. If the frequency of the local oscillation signal is out of phase, the frequency of the frequency-converted signal will deviate from the center frequency of the band-pass crossing device. For this reason, the local vibration signal requires high accuracy and low frequency variation. Recently, in the circuit used to generate this local oscillator signal, an electronic channel selection circuit based on the PLL frequency synthesizer method that can be used to lighten the micro-brain is started. In the oscillator used in this circuit, a crystal with high accuracy and low frequency variation is usually used early. Also, most of the radio receivers currently on the market can receive FM it. Stereo broadcasters can receive stereo FM signals after receiving state stereo broadcasts. The stereo demodulation circuit can be used to decode the synthesized signals. Tune the left audio signal (L signal) and the right audio signal). The demodulation processing in the stereo demodulation circuit is performed by extracting the L signal and the R signal contained in the stereo synthesis signal based on the gate pulse signal generated in synchronization with the pilot signal included in the stereo synthesis signal. This legislation (谙 read the note on the back before filling out this page) Γ Install.,? Τ This paper is suitable for financial management ^ 丨 × 297men-4-5. Description of the invention (A7 B1 Central Standard of the Ministry of Economic Affairs) The cooperative has printed Zhaosheng demodulation circuits. In order to obtain stable demodulation characteristics, for example, there is a demodulation circuit using a ceramic vibrator. Β i said, a crystal oscillator or a ceramic resonator used in the above-mentioned electronic tuning circuit or stereo demodulation circuit. Because of the use of the characteristics of its materials, it cannot be integrated into a semiconductor substrate. Therefore, when you want to increase the volume of a radio receiver, you can increase the number of parts that cannot be formed outside the semiconductor substrate. The oscillating signal of the local oscillating signal of the electronic tuning circuit of the PLL frequency synthesizer method is a crystal vibrator used in order to generate a local oscillator signal because it requires high accuracy and low frequency variation. It is necessary to select only the frequency accuracy for use, which will hinder the reduction of the cost of the parts. Disclosure of the invention The present invention was created in view of this point, and its purpose is to provide a radio receiver, It is possible to reduce the number of external components of the circuit of the radio receiver integrated on the semiconductor substrate, and to reduce the cost of the parts. In the radio receiver of the present invention, it enables the first oscillator to perform an oscillating action for FM stereo The pilot signal contained in the synthesized signal is synchronized, and the second oscillator is caused to perform an oscillating action according to the oscillating signal output from this first oscillator, so as to output the local oscillation signal necessary for the frequency conversion of the FM received signal. When the phase synchronization closed (PLL) loop is used to generate the local vibration signal with the accuracy necessary for the frequency conversion of the FM received signal and the frequency variation is small, because the frequency can be divided and output from this oscillator's exhausted signal. The resulting signal is used as the reference frequency signal of the above PLL circuit, and: there is no need to set a dedicated oscillator to generate the reference frequency and rate signal;: ---- T1 installed '~ | (Please read the back (Please fill in this page again for attention),?!

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Printed by the Central Bureau of Standards of the Ministry of Economic Affairs, and printed by the employees. Description of invention (3) Road = can reduce the number of parts. In particular, "considering the electrical vibration of the radio receiver", a device is used to construct the first PLL circuit using a crystal-controlled electronic exhibition control oscillator, so that it can generate the correct The ground pulse signal is only synchronized with the pilot signal, and can realize demodulation processing of the stereo sound without being affected by noise and the like. In addition, the exhaustion signal from the first vibrator wheel has a high accuracy and a small frequency variation, so the frequency can be divided. The 彳 α number of the L number is used as the reference frequency necessary for the oscillating signal of the local unit. The LR signal using the β number from the first vibrator is used to synchronize the control with the pilot signal. The crystal oscillator does not need to strictly select only those with extremely high frequency accuracy, so an inexpensive crystal oscillator can be used to reduce the cost of parts. In addition, a second frequency divider including a first frequency divider and a second oscillator to form a second PLL circuit are used, and a frequency-divided signal output from an oscillation signal of the first oscillator is used as the second The reference frequency of the ριχ circuit. The frequency signal can be used to easily generate a local oscillator with high accuracy and low frequency variation by synchronizing with the pilot signal contained in the 1?] ^ stereo synthesis signal. s number, and the frequency division ratio of the first frequency divider is changed, so that the frequency of the FM received signal can be changed arbitrarily. In particular, it is appropriate to set the oscillation frequency of the first oscillator according to the frequency of the pilot signal and the frequency of the local oscillation surplus signal output from the second oscillation. In short, set the oscillation frequency of the first oscillator so that the frequency of the signal output from the oscillation signal of the first oscillator is divided by the first frequency division. Please read the precautions before you read, The page size of the page book applies to the Chinese National Standard (CNS) Λ4 specification (210X29 "? Gongchu) -6-

J The frequency of the printed pilot signal is consistent with that of the Zhenggong Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs. At the same time, the second frequency division ratio is used to divide down the frequency of a signal output from the oscillator signal of the first oscillator. The value is the same as the frequency except the frequency allocation interval of the FM1 broadcast. Alternatively, the oscillation frequency of the first oscillator is set to an integer multiple of the least common multiple of the frequency of the pilot signal and the frequency of the frequency allocation interval of the radio broadcast. In this way, the oscillation frequency of the first oscillator is set, whereby a signal divided by a signal output from the first oscillator can be used as a reference frequency signal, and can be output from the second oscillator according to the reference frequency signal. The local oscillation signal necessary to convert the frequency of the signal just received. Although the above-mentioned radio receiver is focused on receiving 1; 14 broadcasts, it can also be configured to receive both FM broadcasts and AM broadcasts. In this radio receiver, based on the oscillation signal from the first oscillator, the third oscillator is caused to perform an oscillation operation in order to rotate out the local oscillation signal necessary to change the frequency of the AM received signal. For this reason, as in the case of receiving only fm broadcasts, a signal divided by an oscillation signal output from the first oscillator can be used as a reference frequency signal, so there is no need to set a reference frequency signal for AM broadcasting. The necessary special oscillator can reduce the number of parts. In addition, a second frequency divider with a variable frequency division ratio and a third frequency divider described above are included to form a third pll circuit for AM broadcasting. At the same time, a frequency division output signal that is output from the first oscillator is used. The signal is used as the reference frequency signal of the third PLL circuit, so that the third oscillator can be used to easily produce a high-precision, low-variation AM broadcast local unit that is synchronized with the pilot signal included in the FM stereo composite signal. Oscillation signal, and change the second frequency; ^ "install-(Please read the precautions on the back before filling this page)

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This paper size is in accordance with Chinese national standard ((;?)) 44 specifications (2) (^ 297 Gongchu) -7- The central government approved and printed only A7 ___ B7-. _ _ _ _ V. Description of the invention (5): The frequency division ratio of the ~~ device can be used to arbitrarily change the frequency of the AM received signal. Especially, for radio receivers that can receive FM broadcast and AM broadcast, it should be based on the pilot frequency. The signal and output from the second 'the third vibration of each local vibration · # frequency' set the exhaustion frequency of the first oscillator. Specifically, the 'set the oscillation frequency of the first oscillator' in order to use the first A frequency division ratio is used to divide a frequency of the signal output from the first oscillator's oscillating signal is the same as the frequency of the pilot signal. 'The second frequency division ratio is used to divide a round of the oscillating signal from the first vibrator. The frequency of the signal is the same as the value of the frequency divided by the frequency allocation interval of the FM broadcast by a given integer value, and the third frequency division ratio is used to divide the frequency of a signal output from the oscillation signal of the first oscillator. The given integer value is the same as the frequency of the AM broadcast frequency allocation interval, or Or 'set the oscillation frequency of the first oscillator at an integer multiple of the least common multiple of the frequency of the pilot signal, the frequency of the frequency allocation interval of the FM broadcast, and the frequency of the frequency allocation interval of the am broadcasting. The oscillator's oscillation frequency can be used as a reference frequency signal for the second and third PLL circuits. The “彳 s number” divided by the signal output from the first oscillator can be used as the reference frequency signal for the second and third PLL circuits. Local oscillator signals necessary for converting AM received signals and FM received signals are output from the second oscillator and the third oscillator. Brief Description of the Drawings Fig. 1 shows a radio receiver to which an embodiment of the present invention is applied. Figure 2 shows the detailed structure of the FM stereo demodulation circuit; Figure 3 is the signal waveform used to explain the operation of the stereo separation circuit. (Please read the precautions on the back before ^ 艿 this page )

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Printed by the Central Bureau of Standards, Ministry of Economic Affairs, Shellfish Consumer Cooperative A7 --- --_ B7_ V. Description of the Invention (0)-Figure; Figure 4 'is a diagram showing the FJV [detailed structure of the PLL circuit. The radio receiver according to the present invention is characterized in that it performs the vibration I operation synchronized with the pilot signal included in the FM stereo composite signal, and generates the necessary leisure for the ship ’s sound demodulation processing. At the same time, the pulse signal generates the necessary reference frequency signal in the pLL circuit used to output the local oscillation signal according to the vibration surplus signal obtained by the vibration remote operation. Hereinafter, a radio receiver to which an embodiment of the present invention is applied will be described in detail with reference to the drawings. (1) Overall Configuration of Radio Receiver FIG. 1 is a diagram showing the overall configuration of a radio receiver according to an embodiment; that is, it shows a structure that can receive both a ^^! Broadcast and an AM broadcast. The radio receiver 100 shown in the figure includes: an FM tuning circuit unit 1 as a high frequency head, which performs frequency conversion on the FM signal received through the antenna 19 in order to receive FM broadcasting; 1?] ^ Use PLL circuit 2, which is used to generate the local oscillator signal for frequency conversion of FM tuning circuit section 1, and FM detection circuit 3, which is used to detect the rotation from the FM tuning circuit section. The FM stereo demodulation circuit 4 is used to demodulate the L signal and the R signal from the FM stereo synthesis signal; the low frequency amplifier circuits 101 and 102 are used to amplify the L signal and the R signal respectively. As audio output; and speakers 103,104. In addition, the radio receiver 100 includes: the eight-channel tuning used as a high-frequency head circuit circuit 5 which performs frequency conversion on the AM signal received through the antenna 59 in order to receive am broadcasting; and a PLL circuit for am 6, which uses this paper wave scale _ Zhongguanjia Zhuan (CNS) eight 4 threats (published by 21G X297);: ^ installed ·; (read the precautions on the back before filling in this page)

、 1T printed A7 ____ B7 by the central standard 扃 Beigong Consumer Cooperative Fifth, the description of the invention (7), '-~~ to generate the local oscillation signal used for the frequency conversion of the AM tuning circuit section 5; AM detection circuit 7. It is used to detect the letter output from the AM tuning circuit section 5 to output an AM audio signal; the low-frequency amplifier circuit 105 is to amplify the AM audio signal as an audio output; and the speaker 106. The radio receiver 100 includes three frequency dividers 22, 23, and 24, which are used to input the reference frequency signal for the PLL operation and the given frequency to the FM PLL circuit 2 and circuit 6. Channel selection instructions; Channel selection control section 9; and operation section 10.动作 Operation of the radio receiver The radio receiver 100 having the above-mentioned configuration will be described with respect to operations when receiving a broadcast and when receiving an AM broadcast. First, the operation when receiving an FM broadcast will be described. — The FM signal received through the antenna 19 is converted into an FM intermediate frequency signal by the fm tuning circuit part i. The FM tuning circuit section 1 includes a high-frequency amplifier circuit 11, a hybrid circuit 13, a band-pass filter 15, and an intermediate-frequency amplifier circuit 17, as shown in the figure. Output from the high-frequency amplifier circuit π '-will be input through the antenna 19, where FM k is the amplified 彳 g number> followed by the hybrid circuit I], a signal output from the high-frequency amplifier circuit 11 and an output PLL circuit After the local oscillator is completely mixed, the difference signal of these two signals is output. The detailed structure and operation of the fm PLL · circuit 2 will be described later. The band-pass filter 15 has a pass-band width; it extracts only components near a given frequency (for example, 107 MHz) from the signal output from the hybrid circuit 13 and then rotates them out. The intermediate frequency amplifier circuit 17 outputs an FM intermediate frequency signal which amplifies the signal output from the band-pass filter. (210X297mm) I-^ ---: ---- T-loading-I (Please read the precautions on the back before filling this page)

, 1T--10- A7 B7 Printed by the Consumers ’Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 5. Description of the invention (8) After FM detection circuit 3, FM detects the FM intermediate frequency signal and demodulates it into FM stereo synthesis signal. The synthesized signal in FM stereo includes the main channel signal of. 彳 g + R 彳 § number; [signal signal and subchannel signal with 38kHz field 1j carrier wave and load wave AM modulation; and 19kHz pilot signal. The FM detection circuit 3 uses, for example, 90. Phase shift detection method. Next, the FM stereo demodulation circuit 4 demodulates and outputs the L signal and the R signal from the fm stereo composite signal. The L signal and R signal are respectively amplified by the low-frequency amplifier circuit 101 '102 and output' from the speakers 102 and 406. Next, a description is given of a reception operation when receiving an AM broadcast. The AM signal 'received through the antenna 59 is converted into an am intermediate frequency number by the AM spectrum modulation circuit section 5. The AM tuning circuit is a circuit section. As shown in the figure, a high-frequency amplifier circuit 51, a hybrid circuit 53, a band-pass filter 55, and an intermediate-frequency amplifier circuit 57 are provided. The AM tuning circuit section 5 performs the same operation as the FM tuning circuit section described above to output an AM intermediate frequency signal. The AM intermediate frequency signal is demodulated into an AM audio signal by AM detection by an am detection circuit. The AM detection circuit 7 uses, for example, an envelope detection method. The AM audio signal is then amplified by the low-frequency amplifier and amplified by the large circuit 105 before being output from the speaker 106. In addition, in FIG. 1, in order to simplify the explanation, in addition to the speakers for FM broadcasting 103 and ι04, the speakers for AM broadcasting 10 are additionally provided. However, when receiving AM broadcasting, the output is amplified from the low frequency. The signal of the circuit 105 is turned into the speakers ι03, ι04, so that the speaker 106 may be omitted. < (3) Configuration and operation of FM stereo demodulation circuit Next, the detailed configuration and operation of the FM stereo demodulation circuit 4 will be described. Figure 2 shows the detailed structure of the FM stereo demodulation circuit 4. This paper is based on the Chinese National Standard (CNS) Λ4 specification (2 丨 0X297 mm) I-: ---; ---- ΤΊ 装; -I (Please read the notes on the back before filling in this I) Order-11-Printed by the Shellfish Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs ^ V. Description of the invention (9's picture. As shown in the picture 'FMiL bulk sound demodulation The circuit 4 includes a reference signal generating unit 4 for generating a given reference signal, and a closed-pulse generating circuit 442 for generating a closed-pulse signal used to separate AM stereo composite signals; a pilot A signal detection circuit 44 is used to detect the pilot signal included in the FM stereo composite signal; and a stereo separation circuit 43 is used to separate the L signal and the r signal from the FM stereo composite signal. The reference signal generation unit 4b The system includes four frequency dividers 81 to 84, preamplifier 85, phase comparator 86, low-pass filter (LpF) 87, and voltage controlled oscillator (VCO) 88. Frequency signal detection circuit 44 and the frequency divider shown in FIG. No. 〇 < 〇88 included in the reference signal generating section 41 includes the oscillation circuit 91, the crystal oscillator 92, and the varactor diode 93. The frequency of the oscillation signal output from the oscillation circuit 91 follows the The load capacity of a crystal oscillator 92 connected to the oscillating circuit 91 is variable. According to this embodiment, the valley-transistor transistor 93 corresponds to the load capacity of the crystal oscillator 92, which can be added to the The reverse bias voltage of the varactor diode 93 changes, so that the oscillation frequency of the oscillation circuit 91 becomes variable. With two frequency dividers 81, 82 having a given frequency division ratio, the frequency of the oscillation output from the VC088 is divided. For example, the frequency division ratio of the frequency divider μ in the previous stage is set to "15", and the frequency division ratio of the frequency divider 82 in the later stage is set to "30". Outputs two frequency-divided signals that are 180 ° out of phase with each other; these two frequency-divided signals are input to the gate pulse generation circuit 42. The two frequency-divided signals from the frequency divider 82 will be output-this paper size applies China National Inverse Standard (CNS > Λ4 Specification (2 丨 0 > < 297 mm "Loading-| ------ · (Please read the notes on the back before filling out this page) • In? -1 0 Order -12- A7 B7 Five Central Bureau of Standards, Ministry of Economic Affairs Description of the invention (10). One of the parties (signal a shown in FIG. 2) is further divided by a frequency divider 84 and input to the pilot signal detection circuit 44; and the other party (shown in FIG. 2) The signal b) is further divided by the frequency divider 83, and then input to the phase comparator 86 °. The frequency divider 83 has a given frequency division ratio (for example, "2"); its outputs are 180 degrees out of phase with each other. Two frequency-divided signals (signals c, d shown in FIG. 2); these two frequency-divided signals are input to the phase comparator rib ^, and the frequency divider 84 has the same frequency division as the frequency divider 83 Frequency ratio (for example, "2"); for the two frequency-divided signals output from the frequency divider 83, it outputs two frequency-divided signals with a phase difference of 90 (signal e, magic shown in Figure 2); The frequency signal is input to the pilot signal detection circuit 44. The phase comparator 86, in turn, performs a division between the pilot signal including the FM synthesized signal input through the preamplifier μ and an output from the frequency divider. The phase comparison of the frequency signals 'output a signal with a duty cycle according to the comparison result 8 PLL circuit' is composed of the above-mentioned VC088, the frequency divider 81, 82, 83, the phase / bit comparator 86, and the low-pass crossing wave 87, It is used to control the oscillating action of vcogg in order to obtain a reference signal of a given frequency synchronized with the pilot signal contained in the FM stereo composite signal. If the frequency division ratios of the frequency dividers 81, 82, 83 are set to " 15 "," 30 "," 2 ", its 900 (= 15X3〇X2) is divided by the output from vc〇88 The signal of the oscillating signal is input to the phase comparator 86 and controls the oscillating action of VC088 so that the frequency of the frequency-divided signal is equal to the frequency of the pilot signal (19kHz). 〇 | ^^ 装 "-(Please read the precautions on the back before filling in this page) The standard of the paper used in this edition is the Chinese national standard ((^ 5) 8 4 specifications (2) 0 '/ 297 mm)- 13-A7 B1 Printed by the Consumers' Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 5. Description of the invention (11). A reference signal of 17.1 MHz, which is twice as much as the "phase comparator 86. The pilot signal is at the same frequency as the phase difference" When the signal is output from the frequency divider 83, the output duty ratio becomes 50%, and when the phase and frequency of the signal output from the frequency divider 83 deviate from these given values, the phase comparator 86 is turned on. The duty cycle of the signal deviates from 50%. Therefore, the voltage applied to vc〇88 through the low-pass filter 87 changes, which can make the phase and frequency of the signal of the output divider 8 · 3 to the above-mentioned given value. The gate pulse generating circuit 42 is used to turn on the output from the frequency divider 81 in turn. And the two frequency-divided signals output from the frequency divider 82, and from these signals, two frequency-divided signals (gh shown in FIG. 2) synchronized with the pilot signal are output to the stereo separation circuit 43. These two The gate pulse signal is set to the same frequency and phase difference as 38 kHz of the subcarrier of the subchannel 彳 s. The pilot signal detection circuit 44 is used to input two outputs from the frequency divider 84. The crossover signal and the FM stereo composite signal are detected based on these signals, and the pilot signal included in the FM stereo composite g number is detected. If a pilot signal is detected, a high voltage is output from the pilot signal detection circuit 44 The flat signal is turned on at the same time as the notification to the stereo separation circuit 43 is turned on. ~ Stereo separation circuit 43 is used to input two gate pulse signals output from the interrogation pulse generation circuit 42, a signal indicating the reception status of the stereo broadcast from the pilot signal detection circuit 44, and an FM stereo composite signal And extract the £ letter from the FM stereo composite signal based on the two gate pulse signals (please read the precautions on the back before filling this page)

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、 1T -n The paper size is' ϋ Ujia County (CNS) Λ4 specification (210X297 mm 7 n ^ i _ -14- A7 B7 There are only five printed inventions printed in the shelling consumer cooperative of the Central Standards Bureau of the Ministry of Economic Affairs (12) and R signals. The figure is used to explain the signal waveform of the stereo separation circuit 43. Figure 3 (a) is a waveform diagram showing the FM stereo composite signal input to the stereo separation circuit k432Fm stereo separation circuit 43; The top two are the waveforms of the gate pulse signal from one side of the gate pulse generating circuit 42; Figure 3 is the waveform of the pulse signal from the other side of the closed pulse generating circuit 42; Figure 3 ( d) shows the waveform of No. 1 仏 output from the stereo separation circuit 43, and Fig. 3 (e) shows the waveform of the R signal output from the stereo separation circuit 43. For simplicity, it is assumed that the L signal has a sine The waveform of the R signal has a rectangular waveform. As shown in Fig. 3 (a), the stereo composite signal includes the ^ signal and the R signal. Also, the "·" symbol in Fig. 3⑷ corresponds to the L signal. 'And the "X" symbol corresponds to the R signal. According to the 3 (1)) and 3 (^), extract the L signal and R signal shown in Figure 3 (d) and Figure 3 (e). For example, the stereo separation circuit 43 It has two switches that are linked to each of the two gate pulse signals to switch the on / off state; it can make one switch into the on state when one gate pulse signal is input, thereby synthesizing from FM stereo The L signal is taken out from the signal, and the other switch is turned on at the timing when the other-side gate pulse signal is inputted, so that the stereo composite signal is taken out from the R signal. A PLL circuit containing VC088 using crystal oscillator 92, so that it can generate a gate pulse signal that is correctly synchronized with the pilot signal. In particular, use a crystal oscillator (please read the precautions on the back before filling this page) Revision -15- V. Description of the invention (I3 A7 B7 Central Standard of the Ministry of Economics and Industry 扃 VCQ88 printed by the Industrial and Consumer Cooperatives & 92 '' is a pilot signal included in stereo synthesis because of the narrow variable frequency range Into a weak state, Even if the FM stereo_synthesis k number contains a lot of voices, it can be made to correctly synchronize with the pilot 仏 number, so that it can realize the demodulation processing of the stereo which is not affected by the voice. Also, the reference signal output from VC088 is controlled to synchronize with the pilot signal with high accuracy and low frequency variation in winter. Therefore, the signal divided by this reference signal can be used as the pLL circuit 2 and The reference frequency signal of the rainbow circuit 6 for tin is used. In addition, the crystal oscillator 92 used for vc〇88 does not need to be selected only with the highest frequency accuracy. Therefore, an inexpensive crystal oscillator can be used to reduce the cost of parts. In addition, the above-mentioned VC088 corresponds to the first oscillator; the circuit 'constructed by the frequency dividers 81 to 83, the phase comparator 86, the low-pass filter 87 & vc〇88 corresponds to the first phase synchronous closed loop; Multiplying the value of each of the three frequency divisions ㈣, 82, and 83 corresponds to the first frequency division ratio. (4) Configuration and operation of FM PLL circuit Next, the operation of the FM PLL circuit 2 will be described. The FM PLL circuit 2 shown in FIG. 1 uses two frequency dividers 24 and 24 to divide and output the signal of the reference signal from the FM stereo demodulation circuit 4 as a reference frequency signal to perform PLL operation. The channel selection signal output from the channel selection control section 9 changes the frequency division ratio of an internal variable frequency divider (to be described later), thereby outputting a local oscillation signal having a desired frequency toward the FM tuning circuit section. The front-end frequency divider 24 has a given frequency division ratio (for example, "% (Please read the precautions on the back before filling out this page) Γ Install ·, βτ. —I1 This paper ruler is used in China (CNS ) Λ4 grid (2iGX_297mm) —. ^ N I 1 16- Printed by the central standard of the Ministry of Industry and Engineering Co., Ltd. 12 A7 ____ V. Description of the invention (14) * j), which will be output from the FM stereo solution The frequency of the 17.1MHz signal from the tuning circuit is divided by 38 to output a signal of 450kHz. Also, the frequency divider 22 at the rear section has a given frequency division ratio (such as "9"), which will be output from the front-end frequency divider 24 The 450kHz signal is further divided by 9 to output a 50kHz signal. The 50kHz signal from the subsequent frequency divider 22 is output as the reference frequency signal necessary for PLL operation and input to the FM PLL circuit 2. The two above The frequency division ratios of the frequency dividers 24 and 22 are set such that the frequency of the reference frequency signal input to the FM PLL circuit 2 from the rear frequency divider 22 and the frequency of the frequency allocation interval of the FM broadcast divided by a given integer value The values are the same. Also, this manual is about FM broadcasting frequency. The given frequency interval for allocating broadcasting frequencies is called "the frequency of the frequency allocation interval for FM broadcasting"; it is 100 kHz compared with FM broadcasting in Japan. Figure 4 is a diagram showing the detailed structure of the PLL circuit for the above-mentioned FM. As shown in the figure, the FM PLL circuit 2 includes a voltage-controlled oscillator (VCO) 21, a low-pass filter (LPF) 29, a phase comparator 25, and a variable frequency divider 27. The local oscillation signal that is synchronized with the reference frequency signal output from the frequency divider 22. The local oscillation signal output from VC021 is output from the FM PLL circuit 2 and is divided by the variable frequency divider 27 and input in Phase comparator 25. In the phase comparator 25, a signal inputted from a variable frequency divider 27 and a reference frequency signal inputted from the frequency divider 22 shown in FIG. 1 are inputted, thereby controlling the oscillation frequency of the VC021 so that The phase difference between these two signals is reduced. Therefore, as described above, if the frequency of the reference frequency signal input to the phase comparator 25 is 50 kHz, the variable frequency divider 27 is divided by _M- -.---- 叫 装-(Please read the notes on the back first Please fill in this page again.) The paper size of the edition is applicable to China's National Standards (CNS) Λ4 specification (2Ι0 × 297). -17- Poverty Alleviation Cooperation of the Central Bureau of Standards of the Ministry of Economic Affairs. ~~ 'The frequency ratio multiplied by this 50kHz frequency becomes the VC021's oscillation frequency. For example, when the frequency divider ratio of the variable frequency divider 27 is made "1680", the output of the VC02 i original exhausted signal is output. The frequency is set to 84MHz (= 50kHz X 1680). According to the channel selection instructions from the operation unit 10 provided with various operation keys, the channel selection control unit 9 turns out a channel selection for setting the frequency division ratio of the variable frequency divider 27 in the FM PLL · circuit 2 signal. It is also said that the PLL circuit 6 for AM shown in FIG. 1 also has the same structure as the PLL circuit 2 for fm described above; it will use two frequency dividers 24 and 23 to divide and output one from the FM stereo demodulation circuit 4. The signal of the reference signal performs PLL operation as a reference frequency signal, and changes the frequency division ratio of the internal variable frequency divider in accordance with the channel selection signal output from the output selection control section 9 to thereby output one round to the AM tuning circuit section 5 The local oscillator signal with the required frequency. The frequency divider 23 in the latter stage has a given frequency division ratio (for example, 50); it will further output the 450kHz signal from the front-end frequency divider 24 by a frequency of 55. Output a 9kHz signal. The signal output from the post-frequency divider 2329 kHz is input as a reference frequency signal necessary for the PLL operation, and is input to the PLL circuit 6 for Hachikawa. The frequency division ratios of the two frequency dividers 24 and 23 are set such that the frequency of the reference frequency signal input from the post-stage frequency divider 23 to the AM PLL circuit 6 is divided by the given integer value to divide the frequency of AM broadcasting. The frequency of the interval is the same. In addition, in this specification, a given frequency interval for allocating a broadcast frequency is referred to as "frequency of an AM broadcast frequency allocation interval" in terms of the AM broadcast frequency; this is 9 kHz in the AM broadcast of the Japanese version. This paper ruler ^ Country ® Home Fresh (ϋ / \ 4 size (2IGX297) ----- ---------- (Please read the note on the back before filling this page)

-18--Printed by the Central Laboratories Bureau of the Ministry of Economic Affairs, Consumer Cooperatives V. Invention Description (I6) In the structure of the above radio receiver 100, the values of the frequency division ratios multiplied by the two frequency dividers 22, 24 correspond to At the second frequency division ratio; the value of the i frequency division ratio multiplied by the two frequency dividers 23, 24 corresponds to the third frequency division ratio. In the configuration of the FM PLL circuit 2 described above, VC02H ^ corresponds to the second oscillator; the variable frequency divider 27 corresponds to the first frequency divider; VC021, the variable frequency divider 27, and the phase comparator The circuit formed by 25 and low-pass filter 29 corresponds to the second phase synchronous closed loop. When the configuration of the PLL circuit 2 for FM shown in FIG. 4 is made as it is, the VC021 included in the AM PLL circuit 6 corresponds to the third oscillator. The variable frequency divider 27 corresponds to the second frequency divider, and the circuit composed of VC021, variable frequency divider 27, phase comparator 25, and low-pass filter 29 corresponds to the third phase synchronous closed loop. It is stated that the radio receiver 100 of this embodiment is formed by using a reference signal generated in a frequency-dividing FM stereo demodulation circuit 4 without using a credit output from a reference oscillator containing a dedicated crystal oscillator, The signal is used as an input to generate a local oscillation signal? 1 ^ The reference frequency signal of PLL circuit 2 and AM PLL circuit 6 is used, so there is no need to install a dedicated reference oscillator, which can reduce the number of parts. In particular, when the components of the radio receiver 100 are integrally formed on a semiconductor substrate, the number of external components of the crystal oscillator that cannot be integrated can be reduced. In addition, in the FM PLL circuit 2 described above, the reference signal output from the stereo demodulation circuit 4 is divided and used as a reference frequency signal, thereby synchronizing the pilot signal contained in the FM stereo composite signal with a high- 19- Printed by the Central Standards Bureau of the Ministry of Economic Affairs, Consumer Cooperatives, printed A7 B7 V. Description of the invention (17), the local oscillation signal with high accuracy and low frequency variation is easy to generate; and the frequency division ratio of the variable frequency divider 27 is changed. This can arbitrarily change the frequency of the fm received signal. Λ sample, the AM PLL circuit 6 can output a local exhaustion signal with high accuracy and less frequency variation, and the frequency of the AM received signal can be arbitrarily changed. As described above, the frequency of the reference signal output from the FM stereo demodulation circuit 4 is set based on the frequency of the pilot signal and the frequency of the local oscillation signal output from the FM PLL circuit 2 and the AM PLL circuit 6, respectively. Specifically, the frequency of the reference signal output from VC088 is set so that three frequency dividers 81, 82, and 83 are used to divide a frequency of the signal of the reference signal output from VC088 of the FM stereo demodulation circuit 4. The frequency of the frequency signal is the same. The frequency of the signal of the reference signal output from the FM stereo demodulation circuit 4 is divided by two frequency dividers 24 and 22. The frequency is the frequency of the frequency allocation interval divided by the given integer value. The resulting values are consistent, and the frequency of the signal of the reference signal output from the FM stereo demodulation circuit 4 is divided by two frequency dividers 24 and 23, and the frequency allocation interval is divided by the given integer value. The frequency is consistent with the value. Alternatively, the oscillation frequency of the reference signal from the FM stereo demodulation circuit is set to an integer multiple of the least common multiple of the frequency of the pilot signal, the frequency of the frequency allocation interval of the FM broadcast, and the frequency of the frequency allocation interval of the AM broadcast. value. In this way, the oscillation frequency of the reference signal output from the FM stereo demodulation circuit 4 is set, whereby the reference signal can be generated? 14 At the same time, the gate pulse necessary for demodulation is used as the reference frequency signal of the FMfflpLL circuit 2 or the PLL circuit 6 for the AM, and can be installed from the pLL circuit of the FM — (please read the note on the back first) Matters need to be refilled on this page) Order printed by the Central Bureau of Standards of the Ministry of Economic Affairs and Consumer Cooperatives to print A7 ---------- B1 V. Description of the invention (18) Circuit 2 and AM PLL circuit 6-round FM reception Local oscillation signals necessary for frequency conversion of signals and AM received signals. The present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the scope of the gist of the present invention. For example, although the above embodiment is configured to receive FM broadcast and AM broadcast, it may be configured to receive only FM broadcast. In this case, the antenna 59, the AM tuning circuit section 5, the AM detection circuit 7, the low-frequency amplifier circuit 105, the speaker 106, the AM PLL circuit 6, and the frequency divider 23 may not be provided. Also, if the AM broadcast is not received, since the local oscillation signal of the AM broadcast and the frequency allocation interval of the AM broadcast need not be considered, the frequency of the pilot signal and the output of the local oscillation signal from the FM PLL circuit 2 are used according to the frequency of the pilot signal. As the frequency, the frequency of the reference signal output from the FM stereo demodulation circuit 4 may be set. Specifically, the frequency of the reference signal output from VC088 is set so that the frequency of the signal of the reference signal output from VC088 is divided by three frequency dividers 81, 82, and 83. The frequency of the signal is consistent with the frequency of the pilot signal. At the same time, two frequency dividers 24 and 22 are used to divide a frequency from the fM stereo demodulation circuit 4. The frequency of the signal output from the quasi-signal is the frequency divided by the given integer value divided by the frequency of the broadcast allocation interval. Success values are consistent. Alternatively, the oscillation frequency of the reference signal output from the FM stereo demodulation circuit 4 is set to a value that is an integer multiple of the least common multiple of the frequency of the pilot signal and the frequency of the frequency allocation interval of the FM broadcast.丨 Again, 'Although the frequency division ratios of the above-mentioned seven frequency dividers 22, 23, 24, 81, 82, 83, and 84 are set to 9, 5, 0, 38, 15, 30, 2, 30 respectively, but this As long as the frequency division ratio is based on the frequency of the pilot signal, the output is for personal use ---------- I (please read the note f on the back before filling this page),?!

-21-ΠΓ: Α7 Β7 Description of invention (I9 ^ The central standard bureau of the Ministry of Standards and Technology Co., Ltd. printed circuit 2 of the local oscillator signal and the frequency of the AMffipLL circuit 6 'set, you can appropriately change. '' Utilization characteristics of the industrial 如上所述 As described above, according to the present invention, the first vibrator performs a vibrating action so as to synchronize with the pilot signal included in the FM stereo composite signal, and according to the output of the first oscillating signal It enables the second oscillator to perform the oscillating action in order to output the local oscillation signal necessary for frequency conversion. Therefore, it is not necessary to separately set a dedicated oscillator necessary to output the local oscillation signal, which can reduce the number of parts. Especially If the radio receiver circuit is integrally formed on the semiconductor substrate, the number of external components such as the crystal oscillator used for the oscillator can be reduced. The first oscillator 1 is also used as a voltage-controlled oscillator using a chirped crystal oscillator. The post-generator constitutes the first ~ PT Φ ^ ^ I circuit, which can make it generate a gate pulse signal that is only correctly synchronized with the pilot signal. As a voltage-controlled 5 oscillator using a crystal oscillator to constitute the _pLL circuit, the oscillator can output two oscillators with two precisions and less frequency variation. Therefore, the body oscillator used by it You don't need to select the one with high frequency accuracy, you can use a cheap crystal oscillator to reduce the cost of parts. Read the precautions before reading 1¾ and then fill in. The paper size of the menu page applies to China _ ^^ 71 ^^ 7 · -22 Description of the invention (2〇)

A7 BT component numbers are compared with those of the Ministry of Economic Affairs and Central Government, but only for consumer cooperatives. 1. FM Tuning Circuit Department 2.. 1 ^ circuit 3.. .FM detection circuit 4.. .FM stereo circuit 5.. AM tuning circuit 6.. 1 ^ circuit 7..AM detection circuit 9 ... selection control section 10 ... operation section 11 ... high frequency amplifier circuit 13..hybrid circuit 15 ... band pass filter 19 ... antenna 17,57 ... intermediate frequency amplifier circuits 22, 23, 24 ... frequency divider 41 .. reference signal generating section 42 ... gate pulse generating circuit 43 ... stereo separation circuit 44 ... pilot signal detection circuit 51 ... high Frequency amplifier circuit 53 .. Hybrid circuit 55 .. Band-pass filter 5 9 ... Antenna 81 ~ 84 ... Frequency divider 85 ... Preamplifier 86 .... Phase comparator 87..Low pass Filter 88 ... Voltage-controlled oscillator 91 .. Oscillation circuit 92 .. Crystal oscillator 93 ... Varactor 100 ... Radio receiver 101, 102, 106 ... Low-frequency amplifier circuits 103, 104, 106 ... Speaker paper Dimensions are applicable to China National Standards (CNS) A4 specifications (2 丨 0X297) (嫠 Please read the precautions on the back before filling this page) Τ

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Claims (1)

A8 B8 C8 Dg Printed by the Central Government Bureau of the Ministry of Economic Affairs, Shellfish Consumer Cooperatives 6. The scope of patent application J ι · A radio receiver, including the "vibrator" is used to perform FM stereo synthesis after FM detection The given oscillating action of the pilot signal contained in the signal is synchronized, and the first vibration generator is the local machine required to generate the frequency of the FM received signal according to the output of the aforementioned first oscillator with the number s. Oscillation signal 02. The radio receiver according to item i of the scope of the patent application is characterized in that: the first oscillator is a voltage-controlled oscillator using a crystal oscillator; and a voltage-controlled oscillator is provided. The first phase synchronizes the closed loop, thereby generating a given gate pulse signal necessary for demodulating the aforementioned 1?] ^ Stereo composite signal. 3. The radio receiver according to item 丨 in the scope of the patent application, which is characterized in that: A signal which is divided by an oscillating signal output from the first oscillator is used as a reference frequency signal, and a device including The first frequency divider capable of changing the frequency division ratio and the second phase synchronous closed loop of the second oscillator; the frequency division ratio of the aforementioned first frequency divider is changed, thereby outputting from the local unit of the aforementioned second oscillator The frequency of the exhaustion signal becomes variable. 4 · According to the characteristics of the radio receiver described in item 1 of the scope of patent application, its characteristics ^ ——'---------- Order ------- 1 (Please read the precautions on the back before filling (This page) This paper size is applicable to China National Standards (CNS) 8 4 (210X297 mm) 24-printed by the Bayer Consumer Cooperative of the Central Slope Bureau of the Ministry of Economic Affairs «. A8 B8 C8 ___________ py, patent application group month! ) The oscillating frequency of the first oscillator is set according to the frequency of the pilot signal and the local oscillation signal frequency output from the second oscillator. The radio receiver according to item 4 of the patent scope of claim 4 is characterized by: '' The oscillation frequency of the aforementioned first oscillator is set as follows: a first frequency division ratio is used to divide and output an output from the aforementioned first oscillator. The frequency of the signal of the vibration surplus signal is consistent with the frequency of the aforementioned pilot signal. At the same time, the second frequency division ratio is used to divide the frequency. The values of the frequencies except the FM broadcast frequency allocation interval are the same. 6. The radio receiver according to item 1 of the scope of the patent application is characterized in that the oscillation frequency of the first oscillator is set to be the frequency of the pilot signal and the frequency of the frequency allocation interval of the FM broadcast, A value that is an integer multiple of the least common multiple. 7. The radio receiver according to item 1 of the scope of patent application, characterized in that the aforementioned radio receiver further includes a third oscillator which generates am reception according to an oscillation signal output from the aforementioned first oscillator. The local oscillation signal necessary for the frequency conversion of the signal. 8_ The radio receiver according to item 7 of the scope of patent application, characterized in that: it divides the frequency of a signal output from the oscillation signal of the second oscillator. This paper uses China National Standard (CNS) A4 (210x297):-^-(Please read the notes on the back before filling out this page) Order -25- 8 〇8 ABCD Printed by the Central Labor Standards Bureau of the Ministry of Economic Affairs, Consumer Labor Cooperatives 6. Scope of Patent Application At the same time as using as the reference frequency signal, it is provided with a second closed-loop that includes a changeable frequency division ratio and the third closed loop of the aforementioned third in; by changing the frequency division ratio of the aforementioned second frequency divider, thereby The frequency of the local oscillation signal output from the aforementioned second oscillator is made variable. 9. The radio receiver according to item 7 of the patent scope is characterized by: The oscillation frequency of the first oscillator described above is based on the frequency and output of the aforementioned pilot signal from the aforementioned second and third oscillators. Set the frequency of each oscillator signal. 1〇_ The radio receiver according to item i in the scope of the patent application is characterized in that: 'The oscillation frequency of the first oscillator is set as follows: a first frequency division ratio is used to classify an output from the first oscillator. The frequency of the signal of the oscillating signal is the same as the frequency of the aforementioned pilot signal; the frequency of the signal of the oscillating signal from the first oscillator described above is divided by a second frequency division ratio and the frequency of the BFM broadcast by a first integer value The value of the frequency of the allocation interval is the same; and the frequency of the signal output from the oscillation signal of the first oscillator by the third frequency division ratio is equal to the frequency of the frequency of the frequency allocation interval of the AM broadcast by a second integer value. The values are consistent. 11 'The radio receiver according to item 7 of the scope of the patent application, characterized in that the oscillation frequency of the first oscillator is set, the frequency of the pilot signal, the frequency of the FM broadcast, the frequency of the allocation interval, and AM Broadcast-: ------------- (Please read the note f on the back before filling this page) Revision-26- VI. Patent application scope A8 68 C8 DS, the least common multiple of the frequency of the frequency allocation interval Values that are multiples of each other (please read the notes on the back before filling out this page): Packing. ≪ 1T Printed by Chinese Central Standards (CNS) Α4 Specification (210 × 297 mm) -27-