WO2004008669A1 - セパレーション調整回路 - Google Patents
セパレーション調整回路 Download PDFInfo
- Publication number
- WO2004008669A1 WO2004008669A1 PCT/JP2003/008226 JP0308226W WO2004008669A1 WO 2004008669 A1 WO2004008669 A1 WO 2004008669A1 JP 0308226 W JP0308226 W JP 0308226W WO 2004008669 A1 WO2004008669 A1 WO 2004008669A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- stereo
- separation
- adjustment circuit
- adjusting
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1646—Circuits adapted for the reception of stereophonic signals
- H04B1/1661—Reduction of noise by manipulation of the baseband composite stereophonic signal or the decoded left and right channels
- H04B1/1669—Reduction of noise by manipulation of the baseband composite stereophonic signal or the decoded left and right channels of the demodulated composite stereo signal
- H04B1/1676—Reduction of noise by manipulation of the baseband composite stereophonic signal or the decoded left and right channels of the demodulated composite stereo signal of the sum or difference signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1646—Circuits adapted for the reception of stereophonic signals
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1646—Circuits adapted for the reception of stereophonic signals
- H04B1/1661—Reduction of noise by manipulation of the baseband composite stereophonic signal or the decoded left and right channels
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H40/00—Arrangements specially adapted for receiving broadcast information
- H04H40/18—Arrangements characterised by circuits or components specially adapted for receiving
- H04H40/27—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95
- H04H40/36—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving
- H04H40/45—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving for FM stereophonic broadcast systems receiving
- H04H40/63—Arrangements characterised by circuits or components specially adapted for receiving specially adapted for broadcast systems covered by groups H04H20/53 - H04H20/95 specially adapted for stereophonic broadcast receiving for FM stereophonic broadcast systems receiving for separation improvements or adjustments
Definitions
- the present invention relates to a separation adjustment circuit for increasing the degree of separation between left and right signals in a stereo receiver.
- FIG. 1 is a diagram showing a conventional stereo receiver.
- the intensity of the L + R component signal output from the FM detector 73 is variable.
- the intensity of the L-to-R component signal is not significantly affected by the variable resistor 78, but is affected only by the resistors 79 and 81, due to the effects of the resistors 78, 79, and 81. That is,
- the frequency band of the L-R component signal is a band centered on a frequency of 38 kHz.
- the impedance of the capacitor 77 is small and passes through the capacitor 77 without being largely affected by the variable resistor 78.
- the impedance of the capacitor 77 is large, and the strength (signal level) changes according to the resistance value of the variable resistor 78.
- the intensity of the L + R component signal can also be changed, so that the intensity ratio between the L + R component signal and the LR component signal can be adjusted appropriately. Therefore, it is possible to increase the degree of separation of stereo signals.
- an object of the present invention is to provide a separation adjustment circuit that has few external components and that can easily adjust the intensity ratio of a composite signal in consideration of the above problems. Disclosure of the invention
- the separation adjustment circuit of the present invention is a separation adjustment circuit that adjusts an intensity ratio between a sum signal and a difference signal in a stereo composite signal and increases the degree of separation between a stereo right signal and a stereo left signal.
- Sum signal extracting means for extracting a sum signal from the stereo composite signal; difference signal extracting means for extracting a difference signal from the stereo composite signal; mixing the sum signal and the difference signal to obtain a stereo right signal and a stereo left signal Mixing means for obtaining a signal; first adjusting means for adjusting the amount of current flowing through the sum signal extracting means or the difference signal extracting means to adjust the intensity of the sum signal or the difference signal; and Generating means for generating a control signal for controlling the adjusting operation of the adjusting means.
- the sum signal is a signal indicating an L + R component signal obtained by adding the stereo right signal and the stereo left signal
- the difference signal is a difference between the stereo right signal and the stereo left signal. This is a signal indicating the L-R component signal that is the difference.
- the sum signal extracting means is, for example, a current mirror circuit for extracting a sum signal from a stereo composite signal input to the differential amplifier.
- the difference signal extracting means is, for example, a stereo signal. This is a current mirror circuit for extracting the difference signal from the composite signal.
- the mixing means is, for example, a mixer circuit for mixing the sum signal and the difference signal to obtain a stereo right signal and a stereo left signal, wherein the sum signal extracting means and the difference signal extracting means , And the mixing means constitute a stereo demodulation function.
- the first adjusting means is, for example, an output-side transistor constituting the current mirror circuit, and the sum signal or the difference signal is obtained by adjusting a current amount of the output-side transistor.
- the signal strength By adjusting the signal strength, the degree of separation between the stereo right signal and the stereo left signal can be increased.
- the number of external components for adjusting the strength of the sum signal or the difference signal which is required in the conventional stereo receiver, can be reduced, and the mounting area of the printed circuit board can be reduced.
- the operation of the first adjusting means is controlled based on the control means generated by the generating means, the intensity of the sum signal or the difference signal can be easily adjusted without human intervention, and the stereo It is possible to increase the degree of separation between the right signal and the stereo left signal.
- the first adjustment means includes: a plurality of transistors; and selection means for selecting the transistor based on the control signal.
- the intensity of the sum signal or the difference signal may be adjusted based on the total current amount.
- the selection means is, for example, a switch, and a switch is connected to each of the transistors, and the ON or OFF operation of the switch is controlled based on the control signal.
- the intensity ratio between the sum signal and the difference signal can be adjusted, so that the degree of separation between the stereo right signal and the stereo left signal can be increased.
- the separation adjustment circuit is configured to output the output of the separation adjustment circuit.
- a resistor connected to the stage, and a second adjusting unit connected in parallel to the resistor and adjusting an amount of current flowing through the resistor, wherein the second adjusting unit is The current amount may be adjusted based on the current amount to be adjusted.
- the DC bias at the output of the separation adjustment circuit can also be adjusted in accordance with the intensity adjustment of the sum signal or the difference signal by the first adjustment means, so that a predetermined signal that does not distort the output signal is obtained. DC bias is possible.
- FIG. 2 is a diagram showing a stereo receiver according to an embodiment of the present invention.
- FIG. 4 is a diagram illustrating a specific example of the current mirror circuit in the broken line portion C.
- FIG. 5 is a diagram illustrating a configuration of a separation adjustment circuit according to another embodiment.
- FIG. 6 is a diagram illustrating a configuration of a separation adjustment circuit according to another embodiment.
- FIG. 2 is a diagram showing a stereo receiver according to an embodiment of the present invention.
- the stereo receiver 10 includes an antenna 11, a front-end unit 12 for performing tuning processing and frequency conversion processing, and an L (left signal) + R (right signal) component signal.
- FM detector 13 that outputs a composite signal consisting of L, R, and R component signals and a pilot signal (stereo signal judgment signal), and stereo demodulation that demodulates the composite signal into a stereo right signal and a stereo left signal
- a separation adjustment circuit 14 that combines a separation adjustment function that adjusts the intensity ratio between the L + R component signal and the L-R component signal is provided. It comprises.
- a resistor 15 for supplying a reference voltage for adjusting the DC bias of the received signal, a buffer amplifier 16, and a DC component cut as an external component are provided at a stage preceding the separation adjustment circuit 14.
- Capacitors 17 are provided.
- FIG. 3 is a circuit configuration diagram of the separation adjustment circuit 14.
- a composite signal and a DC reference voltage are input to a differential amplifier composed of a P-channel MOS transistor 20.
- the composite signal input to the differential amplifier is composed of a current mirror circuit (sum signal extraction means) composed of N-channel MOS transistors (hereinafter simply referred to as transistors) 21 and 22 and transistors 21 and 2
- the current is distributed to the broken line frame A and the broken line frame B by the current mirror circuit (difference signal extracting means) composed of 3.
- the signal distributed to the broken line A represents the L + R component signal
- the signal distributed to the broken line B represents the LR component signal.
- the LR component signal is input to a mixer circuit (mixing means) including the transistor 24, and the 38 kHz component signal is removed.
- the L-R component signal from which the 38 kHz component signal has been removed, and L + R A stereo right signal (R signal) and a stereo left signal (L signal) are obtained by mixing (sum-difference calculation) with the component signals.
- the current amount of the current flowing through the current mirror circuit including the transistors 21 and 23, that is, the current flowing through the transistor 23 (first adjustment means) of the dashed portion B is calculated.
- the adjustment is made based on the control signal generated by the control circuit 25 (generation means).
- the intensity of the L-R component signal can be adjusted, and the intensity ratio between the L + R component signal and the L_R component signal can be adjusted. .
- the current mirror circuit 30 shown in FIG. 4A is composed of a plurality of transistors 23 (23-1, 23-2,..., 233-n) and a switch connected to the drain of each transistor 23. 3 1 (selection means), and the ON or OFF operation of each switch 31 is controlled based on a control signal output from the control circuit 25.
- the switch 31 is configured by a semiconductor switching element.
- the current value of the current flowing through the current mirror circuit 30 changes according to the selected switch 31, and the intensity of the L-R component signal is adjusted. That is, as the number of switches 31 turned ON increases, the amount of current flowing through the contact D increases, A high-intensity L-R component signal is input to the mixer circuit. Conversely, if the number of the switches 31 that are turned on is small, the amount of current flowing through the contact D is small, and a low-strength LR component signal is input to the mixer circuit. Thus, by adjusting the intensity of the LR component signal based on the number of switches 31 that are turned ON, the intensity ratio of the L + R component signal can be adjusted. It is possible to increase the degree of separation from signals.
- another type of current mirror circuit 32 shown in FIG. 4B also includes a plurality of transistors 23 (23-1, 23-2,..., 23-n) and transistors 23 And a switch 31 connected to the gate of the switch. The operation of each switch 31 is controlled based on a control signal generated by the control circuit 25. Then, as in Fig. 4A, the current value of the current flowing through the current mirror circuit 32 changes according to the number of switches 31 selected, so that the intensity of the L-R component signal is adjusted accordingly. Is done.
- the control signal generated by the control circuit 25 is generated based on the degree of separation between the output stereo right signal and the output stereo left signal. That is, for example, when the degree of separation between the stereo right signal and the stereo left signal is low, and the intensity of the L-R component signal is higher than the intensity of the L + R component signal, the control circuit 25 turns on.
- a control signal is generated so as to reduce the number of switches 3 1. The number of the switches 31 at this time is adjusted so that the intensity of the L + R component signal and the intensity of the L-R component signal are the same.
- the amount of current flowing through the mixer circuit can be reduced, and the intensity of the L + R component signal and the intensity of the L-R component signal can be made the same, so that the separation between the stereo right signal and the stereo left signal can be improved. It is possible to increase.
- each transistor 23 of the current mirror circuit 30 or 32 may be changed, and the transistor 23 may be arbitrarily selected by the switch 31. Thus, the current mirror circuit 30 or 32 transistor 23 is large. By making the magnitudes different from each other, the amount of current flowing through the current mirror circuit indicated by the broken line C can be set to an arbitrary value according to the combination of the transistors 23 selected.
- the separation adjustment circuit 40 shown in FIG. 5 is configured such that the output section of the separation adjustment circuit 14 of FIG. 3 is further folded back by a current mirror circuit composed of the transistor 41, and the output section of the current mirror circuit is
- the resistor 42 is connected to a constant current source 43 (second adjusting means) connected in parallel with the resistor 42.
- the other terminals of the resistor 42 and the constant current source 43 are connected to the ground.
- the amount of current of the constant current source 43 is varied by the control signal of the control circuit 25 based on the intensity of the L-R component signal, and becomes a predetermined DC bias at which no distortion occurs in the output signal. Is adjusted as follows.
- the amount of current flowing through the resistor 42 can also be varied. Even if the intensity of the R component signal is adjusted to increase, It is possible to suppress the output from becoming a DC bias over a certain level, and it is possible to suppress distortion of the output signal.
- the method of varying the amount of current of the constant current source 43 includes, for example, a transistor 21, a plurality of transistors 23, and a switch 31 connected to each transistor 23 as shown in FIG. In the current mirror circuit, transistor 2
- the current flowing through resistor 42 may be adjusted. That is, a method is considered in which the constant current source 43 is folded back by a current mirror circuit composed of a plurality of transistors, and the number of transistors on the output side is changed by selecting the number of switches using a switch or the like.
- FIG. 6 is a diagram illustrating a separation adjustment circuit configured to adjust the amount of current in the output stage without folding back by a current mirror circuit.
- a resistor 42 and a constant current source 43 connected in parallel with the resistor 42 are connected to the output stage of the separation adjustment circuit 50, and the resistor 42 and the constant current source are connected. 4 The other terminal of 3 is connected to the power supply (VDD). Then, as in FIG. 5, the value of the current flowing through the constant current source 43 is varied based on the control signal output from the control circuit 25.
- the DC bias of the output signal can be controlled to a predetermined value.
- a variable resistor may be provided in place of the transistor 23 of the separation adjustment circuit 14 in FIG.
- the L-R component signal and the L + R A stereo demodulation mixer circuit for the stereo demodulation function. This can be realized by adjusting the bias current (current amount of the current mirror circuit).
- the electrical control based on the control signal generated by the generating means makes it possible to increase the degree of separation between the right signal and the left signal without manual intervention.
- the separation adjustment circuit according to the embodiment of the present invention can omit the variable resistor 78 and the like required in the conventional stereo receiver 70 in FIG. 1, so that the received signal is based on the resistance. Since the influence of the impedance is eliminated, the capacitance of the capacitor 76 for cutting the DC component of the received signal can be reduced. Since the capacity of the DC component cutting capacitor 76 (the capacitor 17 in the embodiment of the present invention) is small, that is, a capacitor having a small size can be mounted in this manner, the printed circuit board can be mounted. The mounting area of the board can be further reduced.
- the separation adjustment circuit is configured to adjust the amount of current of the L-R component, but may be configured to adjust the amount of current of the L + R component.
- the separation adjustment circuit of the present invention by adjusting the amount of current flowing to the extracting means when extracting the sum signal or the difference signal from the stereo composite signal based on the control signal generated by the generating means, Can be configured on an IC chip, etc., which reduces the number of external components required for separation adjustment required in conventional stereo receivers, and reduces the mounting area of the printed circuit board. It is possible to do.
- the intensity ratio between the sum signal and the difference signal is adjusted based on the control signal generated by the generating means, it is possible to increase the degree of separation between the right signal and the left signal without manual intervention. Become.
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- Engineering & Computer Science (AREA)
- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Stereo-Broadcasting Methods (AREA)
- Amplifiers (AREA)
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN03816549.XA CN1669253A (zh) | 2002-07-12 | 2003-06-27 | 分离调整电路 |
DE60314150T DE60314150T2 (de) | 2002-07-12 | 2003-06-27 | Schaltung zur trennungsjustierung |
US10/520,889 US20060008090A1 (en) | 2002-07-12 | 2003-06-27 | Separation adjusting circuit |
EP03736296A EP1530310B1 (en) | 2002-07-12 | 2003-06-27 | Separation adjusting circuit |
KR1020057000476A KR100709940B1 (ko) | 2002-07-12 | 2003-06-27 | 분리조정회로 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002-203585 | 2002-07-12 | ||
JP2002203585A JP3891896B2 (ja) | 2002-07-12 | 2002-07-12 | セパレーション調整回路 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004008669A1 true WO2004008669A1 (ja) | 2004-01-22 |
Family
ID=30112678
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/008226 WO2004008669A1 (ja) | 2002-07-12 | 2003-06-27 | セパレーション調整回路 |
Country Status (8)
Country | Link |
---|---|
US (1) | US20060008090A1 (ja) |
EP (1) | EP1530310B1 (ja) |
JP (1) | JP3891896B2 (ja) |
KR (1) | KR100709940B1 (ja) |
CN (1) | CN1669253A (ja) |
DE (1) | DE60314150T2 (ja) |
TW (1) | TWI236243B (ja) |
WO (1) | WO2004008669A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006001173A1 (ja) * | 2004-06-25 | 2006-01-05 | Niigata Seimitsu Co., Ltd. | ステレオセパレーション調整回路及びそのmos集積回路 |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2008252774A (ja) * | 2007-03-30 | 2008-10-16 | Nec Electronics Corp | 電圧制御発振器、及び電圧制御発振方法 |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4049918A (en) * | 1975-10-09 | 1977-09-20 | Sony Corporation | MPX stereo signal demodulator |
US4944010A (en) * | 1987-11-19 | 1990-07-24 | Sanyo Electric Co., Ltd. | Stereo demodulator and a demodulating method thereof |
US4959859A (en) * | 1988-12-15 | 1990-09-25 | Delco Electronics Corporation | FM Channel separation adjustment |
US4972482A (en) * | 1987-09-18 | 1990-11-20 | Sanyo Electric Co., Ltd. | Fm stereo demodulator |
JPH0936821A (ja) * | 1995-07-25 | 1997-02-07 | Sanyo Electric Co Ltd | ステレオ復調回路及びその分離度調整方法 |
JPH10303649A (ja) * | 1997-04-28 | 1998-11-13 | Toshiba Corp | ミキサ回路 |
US6175278B1 (en) * | 1998-05-28 | 2001-01-16 | Fuji Photo Film Co., Ltd. | Variable gain amplifier circuit |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56157149A (en) * | 1980-05-08 | 1981-12-04 | Rohm Co Ltd | Stereo separation control device for fm tuner |
US4607381A (en) * | 1984-10-05 | 1986-08-19 | Sony Corporation | Signal mixing circuit |
JP2000332710A (ja) * | 1999-05-24 | 2000-11-30 | Sanyo Electric Co Ltd | ステレオ放送用受信装置 |
JP6175278B2 (ja) * | 2013-05-21 | 2017-08-02 | 東芝燃料電池システム株式会社 | 燃料電池スタックおよび燃料電池システム |
-
2002
- 2002-07-12 JP JP2002203585A patent/JP3891896B2/ja not_active Expired - Fee Related
-
2003
- 2003-06-27 WO PCT/JP2003/008226 patent/WO2004008669A1/ja active IP Right Grant
- 2003-06-27 KR KR1020057000476A patent/KR100709940B1/ko not_active IP Right Cessation
- 2003-06-27 CN CN03816549.XA patent/CN1669253A/zh active Pending
- 2003-06-27 US US10/520,889 patent/US20060008090A1/en not_active Abandoned
- 2003-06-27 DE DE60314150T patent/DE60314150T2/de not_active Expired - Fee Related
- 2003-06-27 EP EP03736296A patent/EP1530310B1/en not_active Expired - Fee Related
- 2003-07-11 TW TW092118947A patent/TWI236243B/zh not_active IP Right Cessation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4049918A (en) * | 1975-10-09 | 1977-09-20 | Sony Corporation | MPX stereo signal demodulator |
US4972482A (en) * | 1987-09-18 | 1990-11-20 | Sanyo Electric Co., Ltd. | Fm stereo demodulator |
US4944010A (en) * | 1987-11-19 | 1990-07-24 | Sanyo Electric Co., Ltd. | Stereo demodulator and a demodulating method thereof |
US4959859A (en) * | 1988-12-15 | 1990-09-25 | Delco Electronics Corporation | FM Channel separation adjustment |
JPH0936821A (ja) * | 1995-07-25 | 1997-02-07 | Sanyo Electric Co Ltd | ステレオ復調回路及びその分離度調整方法 |
JPH10303649A (ja) * | 1997-04-28 | 1998-11-13 | Toshiba Corp | ミキサ回路 |
US6175278B1 (en) * | 1998-05-28 | 2001-01-16 | Fuji Photo Film Co., Ltd. | Variable gain amplifier circuit |
Non-Patent Citations (1)
Title |
---|
See also references of EP1530310A4 * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006001173A1 (ja) * | 2004-06-25 | 2006-01-05 | Niigata Seimitsu Co., Ltd. | ステレオセパレーション調整回路及びそのmos集積回路 |
Also Published As
Publication number | Publication date |
---|---|
TWI236243B (en) | 2005-07-11 |
JP3891896B2 (ja) | 2007-03-14 |
KR20050018983A (ko) | 2005-02-28 |
CN1669253A (zh) | 2005-09-14 |
TW200403934A (en) | 2004-03-01 |
EP1530310A4 (en) | 2005-10-26 |
KR100709940B1 (ko) | 2007-04-25 |
EP1530310B1 (en) | 2007-05-30 |
JP2004048415A (ja) | 2004-02-12 |
DE60314150T2 (de) | 2008-03-13 |
US20060008090A1 (en) | 2006-01-12 |
EP1530310A1 (en) | 2005-05-11 |
DE60314150D1 (de) | 2007-07-12 |
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