EP1867074A1 - Procede de changement de frequence sans entrave dans un systeme de reception comprenant plusieurs recepteurs exploites en parallele - Google Patents

Procede de changement de frequence sans entrave dans un systeme de reception comprenant plusieurs recepteurs exploites en parallele

Info

Publication number
EP1867074A1
EP1867074A1 EP06723953A EP06723953A EP1867074A1 EP 1867074 A1 EP1867074 A1 EP 1867074A1 EP 06723953 A EP06723953 A EP 06723953A EP 06723953 A EP06723953 A EP 06723953A EP 1867074 A1 EP1867074 A1 EP 1867074A1
Authority
EP
European Patent Office
Prior art keywords
frequency
local oscillator
current
target
actuator
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP06723953A
Other languages
German (de)
English (en)
Inventor
Andreas Leistner
Carsten Huber
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Atmel Germany GmbH
Original Assignee
Atmel Germany GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Atmel Germany GmbH filed Critical Atmel Germany GmbH
Publication of EP1867074A1 publication Critical patent/EP1867074A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/0008—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor
    • H03J1/0058—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with channel identification means
    • H03J1/0083—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general using a central processing unit, e.g. a microprocessor provided with channel identification means using two or more tuners
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • H04B15/04—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
    • H04B15/06—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder by local oscillators of receivers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B2215/00—Reducing interference at the transmission system level
    • H04B2215/064—Reduction of clock or synthesizer reference frequency harmonics
    • H04B2215/066—Reduction of clock or synthesizer reference frequency harmonics by stopping a clock generator

Definitions

  • the invention in its method aspect, relates to a method for changing a frequency of a first local oscillator in a receiving system having a first receiver with the first local oscillator and a first frequency actuator and a second receiver with a second local oscillator and a second frequency actuator.
  • the invention in its device aspect, relates to a receiving system having a first receiver with a first local oscillator and a first frequency actuator, at least a second receiver with a second local oscillator and a second frequency actuator, and a frequency control device, which is a change of
  • Controlled oscillator to a target frequency and / or regulated, wherein a current frequency of the second local oscillator between the current frequency of the first local oscillator and the target frequency is.
  • the invention relates to a computer program and a storage medium of a frequency control device of the receiving system.
  • Such a method such a receiving system and such computer programs and storage media are known per se.
  • RDS Radio Data System
  • the so-called Radio Data System (RDS) transmits information on which alternative frequencies can each receive the same radio program.
  • the receiver can then check the different alternative frequencies for your reception quality and select the best frequency for playback.
  • such a background receiver may be considered as a first receiver and the listener may be considered a second receiver.
  • a disturbing interaction between the two receivers may occur if two local oscillators oscillate at similar frequencies.
  • the first local oscillator settles on alternative frequencies and briefly oscillates when changing between two alternative frequencies in the vicinity of the frequency of the second local oscillator or its frequency passes. Without countermeasures it comes then because of the mentioned interactions to disturbances.
  • first and second receivers are interchangeable with respect to the undesired interaction.
  • the settling of the receiver to a new reception frequency can interfere with the reception of the receiver and vice versa.
  • a high-frequency received signal is down-converted to an intermediate frequency by superposition of oscillator signals.
  • the problem here is that local oscillators of the various receivers must be very strongly decoupled from each other in order to avoid mutual interference.
  • One known remedial measure involves separating the frequency ranges of the local oscillators by using different sidebands when mixing to the intermediate frequency of the heterodyne receiver. However, depending on the width of the used band and location of the intermediate frequency, this is not always possible. In some applications, the use of a sideband is favored, since when using the other sideband, the image frequency can fall, for example, in frequency ranges, in which must be reckoned with strong interference.
  • the object of the invention is, in particular, to specify a method and a reception system with which the disturbing interaction can be reduced during the simultaneous operation of several receivers, each with its own local oscillators.
  • This object is achieved in a method of the type mentioned in that when changing a frequency of the first local oscillator from a current frequency of the first local oscillator to a target frequency at which a current frequency of the second local oscillator between the current frequency of the first Local oscillator and the target frequency, the following steps are performed: Turning off the first local oscillator, driving the first frequency actuator so that the first frequency actuator provides a frequency of the first controlled base frequency associated with the target frequency, turning on the first local oscillator, and adjusting the frequency of the first local oscillator to the target frequency.
  • this object is achieved in a receiving system of the type mentioned fact that the frequency control device turns off the first local oscillator, the first frequency actuator controls so that the first frequency actuator provides the target frequency associated first base value of a frequency control variable, the first local oscillator turns on, and the first receiver adjusts the frequency of the first local oscillator to the target frequency.
  • this object is achieved by a computer program programmed for use in the method and by a storage medium of a frequency control device of the receiving system, on which a computer program for use in the method is stored.
  • the first local oscillator is switched off at the moment in which the operatively coupled first frequency actuator sets its control signal to the first base value.
  • Signal of the first local oscillator is therefore omitted. Instead, they are formed in the signal of the first local oscillator in a first approximation only the signals of the first frequency actuator before and after the change from. This avoids the disturbances resulting from the mentioned interactions. As a result, this leads to the desired interference-free frequency change.
  • the first base value is predetermined to result in a first base frequency above the frequency of the second local oscillator after the first local oscillator is turned on, when the target frequency is above the second local oscillator is, or alternatively, below the frequency of the second local oscillator when the target frequency is below the frequency of the second local oscillator.
  • the first base value is predetermined so that it leads after switching on the first local oscillator to a first base frequency, which is farther away from the current frequency of the second local oscillator than the target frequency.
  • This embodiment takes into account that in the subsequent adjustment to the target frequency overshoots in the time course of the frequency of the first local oscillator can occur.
  • the initially greater frequency spacing largely avoids the frequency of the first local oscillator being undesirably close to the frequency of the second local oscillator in the event of an overshoot.
  • the first base value effectively provides a safety margin that is greater than the expected overshoot.
  • the step of energizing comprises a successive specification of at least one further base value, which leads to a further base frequency which is closer to the target frequency than the first base frequency.
  • This refinement further reduces the risk of interactions between the local oscillators resulting from overshoots.
  • the oscillation frequency of an oscillator and other shock-sensitive frequency ranges eg the receiving frequencies of other receivers
  • the oscillation frequency of the local oscillators in other receivers in the same way in the choice of the base frequencies, which are used to change the oscillation frequency, taken into account become.
  • the first base value be predetermined to result in a base frequency higher than the current frequencies of all the local oscillators smaller than are the target frequency and below the current frequencies of all local oscillators that are greater than the target frequency.
  • values associated with the target frequency, the current frequency of the first local oscillator and the current frequency of the second local oscillator are stored, the first frequency actuator being driven in response to the stored values to be the first base value depending on the stored values.
  • the first frequency actuator outputs a predetermined base value, which after switching on the first local oscillator leads to a first base frequency, which is farther away from the current frequency of that local oscillator whose frequency is the shortest distance to the target frequency than the target frequency.
  • the receiving system uses a lower or an upper end of a tuning range of the first frequency actuator as the first basic value.
  • the frequency control device successively predefines at least one further base value which leads to a further base frequency which is closer to the target frequency than the first base frequency.
  • the receiving system switch off a mixer which mixes a frequency of the first local oscillator with another frequency during a change from the current frequency to the target frequency.
  • the receiving system further receivers, each of which has a local oscillator and a frequency actuator, wherein the frequency control device outputs a first base value which is predetermined so that it leads to a base frequency, which is above the current frequencies of all local oscillators which is less than the target frequency and which is below the current frequencies of all local oscillators that are greater than the target frequency.
  • the frequency control device is designed to store values which are associated with the target frequency, the current frequency of the first local oscillator and the current frequency of the second local oscillator, and the first frequency actuator in response to the stored values so as to control the first base value in Depending on the stored values provides.
  • the frequency control device is in this case preferably designed to check on the basis of the stored values whether the current frequency of the second local oscillator lies between the current frequency of the first local oscillator and the target frequency, and the first one switch off local oscillator only if this is the case.
  • the first receiver has a phase locked loop coupled to the first local oscillator for controlling the frequency of the first local oscillator.
  • Phase-locked loops provide a way of quickly and accurately adjusting the frequency of local oscillators.
  • the receiving system separates the phase locked loop and sets a minimum or maximum value of a tuning range of the phase locked loop as a control variable for the first local oscillator.
  • FIG. 5 shows a profile of the frequency of the first local oscillator during a frequency change which was carried out with remedial measures to reduce the overshoot
  • FIG. 6 shows a circuitry-specific embodiment of the subject matter of FIG. 2.
  • the first receiver 12 has a first high-frequency section 16, a first intermediate-frequency section 18 and a first baseband or demodulation section 20.
  • the embodiment of the intermediate frequency section and the demodulation section is not relevant to the invention. The illustrated embodiments are therefore only to illustrate the invention in a possible technical environment.
  • the first high-frequency section 16 has a first antenna 22, via which high-frequency signals or radio-frequency signals are fed into the first receiver 12.
  • the injected signals are optionally amplified by a first low-noise amplifier 24 before being down-converted or shifted to an intermediate frequency in a first mixer 26 by mixing with a signal from a first heterodyne frequency generator 28.
  • the first intermediate frequency section 18 beginning with the output of the first mixer 26 may comprise a first intermediate frequency filter 30, which may be realized, for example, as a bandpass filter with a bandwidth of 200 kHz. Furthermore, the first intermediate frequency section 18 may comprise a first channel filter 32, which may for example have a bandwidth of 3.4 kHz and which serves to select the various transmission channels.
  • the output signal of the first channel filter 32 is demodulated in this embodiment in a first demodulator 34 and the demodulated signal is transferred to a first connection point 36, which can be connected via further amplifier and signal processing stages, for example with a speaker system.
  • the configuration of the blocks 18, 20 is not relevant for the realization of the invention, for example, according to the modern receivers Intermediate frequency filter digitized.
  • the further signal processing then takes place in a digital signal processor (DSP).
  • DSP digital signal processor
  • the second receiver 14 has a second high-frequency section 38, a second intermediate-frequency section 40, a second baseband or demodulation section 42, a second antenna 44, a second low-noise amplifier 46, a second mixer 48, a second heterodyne transmitter 50, a second one
  • Inter-frequency filter 52 Inter-frequency filter 52, a second channel filter 54, a second demodulator 56 and a second connection point 58 on.
  • the intermediate frequency filtering can alternatively be done in digitized form.
  • Such a structure corresponds to a per se known receiving system, as used for example in car radios with a so-called antenna diversity function.
  • Each heterodyne frequency transmitter 28, 50 has a local oscillator 60, 62, which in principle can interfere with the local oscillator of the other heterodyne frequency transmitter 28, 50 by electromagnetic coupling.
  • electromagnetic coupling is indicated in FIG. 1 by the arrow 64.
  • Fig. 2 shows details of an embodiment of the first heterodyne frequency transmitter 28 with features of the invention.
  • the first heterodyne frequency generator 28 has a first local oscillator 60 with controllable output signal amplitude and a first frequency actuator 66 controlled by an internal or external frequency controller 68 which also controls the output signal amplitude of the oscillator 60.
  • the frequency control device 68 for example, a storage medium on which a computer program is stored for use in a method presented here, wherein the computer program for use in one of these methods is programmed.
  • the first local oscillator 60 has a tuning element 70, which is connected to an output 72 of the first frequency actuator 66 and with which the frequency of the first local Oscillator 60 is tuned. Via an output 74, the first local oscillator 60 is connected to the first mixer 26 and an input 76 of the first frequency actuator 66. Between the output of the local oscillator 60 and the mixer 26, or the input 76, frequency dividers may optionally be used. Via an input 78 of the first local oscillator 60, its output signal amplitude is controlled by the frequency control device 68, wherein the concept of control should also include switching on and off of the first local oscillator 60.
  • the first frequency control element 66 comprises a control value transmitter 80, a basic value transmitter 82 and a changeover switch 84, which are each controlled by the frequency control device 68.
  • the second heterodyne frequency transmitter 50 (see FIG. 1), which is not shown in FIG. 2, is preferably constructed analogously to the first heterodyne transmitter 28 and has a second local oscillator 62 (FIG. 1) with a second tuning element and a second frequency actuator for tuning the frequency of the second one local oscillator 62 on.
  • the frequency control device 68 is connected to both the first heterodyne frequency transmitter 28 and the second heterodyne frequency transmitter 50.
  • the frequency control device 68 is connected to the first frequency actuator 66 (or its components 80, 82, 84) and the second frequency actuator (or its respective components) to drive the frequency actuators so that the local oscillators 60, 62 each have an output signal generate with the respectively desired frequency.
  • the frequency control device 68 is connected to turn on and off the amplitude of the respective oscillator output signal to the first and preferably to the second oscillator.
  • Fl denotes a current frequency of the first local oscillator 60 and F2 a current frequency of the second local oscillator 62.
  • the frequency controller 68 controls the controller 80 and the switch 84 of the first frequency actuator 66 so that the first local oscillator 60 a Output signal with the current frequency Fl generated while the controller of the second frequency actuator is driven so that the second local oscillator 62 generates an output signal with the current frequency F2.
  • F3 denote a target frequency of the first local oscillator 60th
  • the values of the frequencies F1, F2 and F3 or values assigned to these frequency values are preferably known to the frequency control device 68 and are stored in a RAM memory of the frequency control device 68.
  • Frequency Fl to perform the target frequency F3 controls the frequency control unit 68, the first frequency actuator 66 preferably in response to these stored values. Since the stored values are assigned directly to the frequencies of the local oscillators, differences in the tuning behavior of the local oscillators due to different frequency / control voltage characteristics advantageously do not have any effect.
  • FIG. 3 c illustrates an activity state of the first local oscillator changing between an on state "on” and an off state "off
  • Figures 60 and 3b illustrate qualitatively amplitudes and frequencies of its output signal during the frequency change.
  • the first local oscillator 60 is turned on (see Fig. 3c, "on") and correspondingly provides a signal of frequency Fl and predetermined amplitude to the first mixer 26 (see Fig. 3b)
  • the frequency Fl is stabilized by a closed loop from the control value transmitter 80 of the first frequency control element 66 and the first local oscillator 60.
  • the first local oscillator 60 is switched off at the instant t1
  • the first local oscillator 60 is turned off and the steps described below are performed. Because the stored
  • the natural frequency of the first local oscillator 60 is in a second step over a period of time delta_t2 via a control intervention
  • Tuning element 70 to the target frequency F3 or an approximate value or base value F3 A for a regulation of the target frequency F3 adjusted. It will be stored by the
  • Underlying 82 is provided.
  • the adjustment of the frequency of the first local oscillator 60 is illustrated in FIG. 3a by the dashed arrow 86. It goes through the
  • Coupling can be made from the first local oscillator 60 to the second local oscillator 62.
  • the first oscillator 60 is turned on again in a third step at time t3, wherein the amplitude of its output signal oscillates in the ideal case at the target frequency F3.
  • the period of its output signal is then 1 / F3. It should be noted that the period of the oscillator signal is not drawn on the same time scale as the frequency changes. Usually z. B. the transient from the base value F3A to the target frequency F3, so the frequency change after a time t4, a few ms, the oscillator period, however, for example, only 10 ns long.
  • the fourth step can be done both before, after and in parallel to the third step.
  • the first oscillator 60 is turned off at the moment when its tuning element 70 is brought into a state in which the first oscillator 60 oscillates at the frequency F2 of the second oscillator 62 and causes disturbances in the second receiver 14.
  • disturbing Einkoppmngen 64 are avoided in the second receiver 14.
  • the tuning element 70 in the second step are brought into a position which leads to an oscillation frequency F3 A, which is above the oscillation frequencies of all second local oscillators, which are operated at a frequency below the target frequency F3 and which is below the oscillation frequencies of all second local oscillators, which on a Frequency can be operated above F3.
  • the first local oscillator 60 may briefly oscillate in the vicinity of one of the frequencies F2 of the second local oscillator due to overshoot in activating the frequency stabilizing loop, as shown by FIG 4, for the remainder of which the explanations relating to FIG. 3 apply.
  • FIG. 4 shows an overshoot having a frequency bandwidth FA ranging from the base value F3A to above a frequency F2 of a second local oscillator 62. Since the first local oscillator 60 already oscillates again with a non-negligible amplitude when the frequency-stabilizing loop settles in, the overshoot FA could lead to disturbing couplings 64 into a second local oscillator 62 (see FIG. 1).
  • This possibly occurring problem can be avoided by initially setting in the fourth step a frequency setpoint F3B of the frequency-stabilizing loop which is sufficiently close to the base value F3A. This reduces the bandwidth FA of a possibly occurring overshoot and avoids interfering interactions with other local oscillators in other receivers.
  • the frequency setpoint of the frequency-stabilizing loop may be adjusted in several steps via intermediate values F3B, F3C to the target frequency F3, resulting in a stepwise transient to the target frequency F3, without local oscillators are disturbed in other receivers.
  • Such a transient occurring via intermediate values F3B, F3C is shown in FIG.
  • This procedure requires that the frequency bandwidth FA of the Uberschwingers when Activation of the frequency-stabilizing loop, or in the stepwise approximation of their frequency command values to the target frequency F3, becomes smaller when the distance from the base value F3A to an intermediate value F3B is less than the distance of the base value F3A from the target frequency F3. This is usually the case, for example, when using a phase locked loop as the frequency stabilizing loop.
  • the mixer can be switched off or the signal transmission from the heterodyne frequency transmitter to the mixer can be interrupted in order to avoid disturbances of other system components due to the frequencies present at the mixer during the frequency change.
  • the frequency components at the mixer may differ from those of the local oscillator, e.g. when using a frequency divider between local oscillator and mixer.
  • the method described can also be used if there are two receivers in a system which are receiving for antenna diversity reception on the same frequency at times and this state is achieved by deactivating the associated local oscillator in a first receiver and the oscillator signal of the first other recipient is used.
  • the first receiver can be tuned to a different frequency with the described method without disturbing the other receiver.
  • the first step of the method described above is superfluous because the oscillator of the first receiver is already turned off.
  • one position above (or below) the setting range used for tuning to the frequencies in the receiving band can be used.
  • the sequence control for the described tuning method can be realized, for example, as software on a microcontroller, which has access to the corresponding components in the receiver via a control bus.
  • a realization in Hardware in an integrated receiver circuit possible.
  • Fig. 6 shows the subject matter of Fig. 2 with further details of an embodiment of the first frequency actuator 66 with elements of such a phase locked loop as a rule he value 80 together with further details of an embodiment of the first local oscillator 60.
  • like reference numerals designate the same or functionally identical objects .
  • the first local oscillator 60 is realized, for example, as a voltage-controlled oscillator (VCO) with a parallel resonant circuit of inductive (88) and capacitive (90, 92, 94, 96, 98) AC resistors 88, 90, ..., 98, wherein at least one capacitance diode or varactor diode 96, 98 serves as a tuning element 70.
  • VCO voltage-controlled oscillator
  • the capacity of such a capacitance diode 96, 98 can be varied, as is well known, by varying a DC control voltage v_tune applied thereto.
  • the resonant circuit is further coupled with a power supply that can be switched on and off, which replaces the power radiated by the resonant circuit as well as the Joule power loss and the power taken from the mixer in the correct phase.
  • a power supply that can be switched on and off, which replaces the power radiated by the resonant circuit as well as the Joule power loss and the power taken from the mixer in the correct phase.
  • this is realized by the transistor 100, which is connected via a switch between the terminals "+" and "-" of a supply voltage and which is controlled by a part of the AC voltage occurring across the resonant circuit.
  • the switch for switching on and off the power supply and thus the first local oscillator 60 is controlled by the frequency control device 68.
  • the frequency control device 68 - preferably after checking the condition Fl ⁇ F2 ⁇ F3 - controls the switch so that it is opened in step 1 and closed again in step 3 of the method, so that the first local oscillator 60th between times t1 and t3 is turned off while it is otherwise turned on (see Fig. 3 c).
  • the tuning voltage v_rune is provided by the first frequency control element 66, which is controlled by the frequency control device 68 as a function of the stored values in such a way that the respectively desired frequency results at the output of the first local oscillator 60.
  • the control value transmitter 80 of the first frequency control element has a programmable frequency divider 102, a reference frequency generator 104 and a phase frequency detector (PFD) 106.
  • the frequency output by the first local oscillator 60 is divided down by the frequency divider 102 and compared with a reference frequency output by the reference frequency generator 104.
  • the phase frequency detector 106 drives a downstream charge pump 108 to output up-charge pulses or down-charge pulses that charge or discharge a capacitance of a loop filter 110 and hence that from the loop filter gradually change the provided DC control voltage v_tune.
  • the underlying is preferred set directly by selectively controlling the current sources in the charge pump 108.
  • the phase locked loop tuning range is then proportional to the difference in voltage across the loop filter capacitance at full charge and full discharge by the current sources.
  • the programmable frequency divider 102, the switch 84 and the base encoder 82 are driven by the frequency controller 68, which these elements in response to the stored values associated with the frequency values Fl, F2 and F3, according to the above so that the first frequency actuator 66 provides the first base value dependent on the stored values and possibly the further base values dependent on the stored values.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Superheterodyne Receivers (AREA)
  • Noise Elimination (AREA)

Abstract

La présente invention concerne un procédé pour changer la fréquence d'un premier oscillateur local (60) dans un système de réception (10) qui présente un premier récepteur (12) avec le premier oscillateur local (60) et un premier élément de réglage de fréquence (66) et un second récepteur (14) avec un second oscillateur local (62) et un second élément de réglage de fréquence. Lorsque la fréquence du premier oscillateur local (60) passe d'une fréquence courante du premier oscillateur local (60) à une fréquence cible, la fréquence courante du second oscillateur local (62) se trouvant entre la fréquence courante du premier oscillateur local (60) et la fréquence cible, le procédé est caractérisé en ce qu'il consiste à déconnecter le premier oscillateur local (60), à commander le premier élément de réglage de fréquence (66) de manière qu'il prépare une valeur de base d'une variable de réglage de fréquence associée à la fréquence cible, à connecter le premier oscillateur local (60), puis à régler la fréquence du premier oscillateur local (60) à la fréquence cible. Cette invention concerne également un système de réception (10).
EP06723953A 2005-04-07 2006-04-01 Procede de changement de frequence sans entrave dans un systeme de reception comprenant plusieurs recepteurs exploites en parallele Withdrawn EP1867074A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005017005 2005-04-07
PCT/EP2006/002994 WO2006105916A1 (fr) 2005-04-07 2006-04-01 Procede de changement de frequence sans entrave dans un systeme de reception comprenant plusieurs recepteurs exploites en parallele

Publications (1)

Publication Number Publication Date
EP1867074A1 true EP1867074A1 (fr) 2007-12-19

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EP06723953A Withdrawn EP1867074A1 (fr) 2005-04-07 2006-04-01 Procede de changement de frequence sans entrave dans un systeme de reception comprenant plusieurs recepteurs exploites en parallele

Country Status (4)

Country Link
US (1) US20080090542A1 (fr)
EP (1) EP1867074A1 (fr)
CN (1) CN101156339A (fr)
WO (1) WO2006105916A1 (fr)

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Publication number Priority date Publication date Assignee Title
EP2388921B1 (fr) * 2010-05-21 2013-07-17 Nxp B.V. Circuits intégrés avec circuits de génération de la fréquence
JP2014179846A (ja) * 2013-03-15 2014-09-25 Sony Corp 受信装置および電子機器

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Publication number Priority date Publication date Assignee Title
JPS60117927A (ja) * 1983-11-30 1985-06-25 Clarion Co Ltd シンセサイザ受信機
JPH044615A (ja) * 1990-04-23 1992-01-09 Pioneer Electron Corp ラジオ受信機
JP3627783B2 (ja) * 1996-12-26 2005-03-09 シャープ株式会社 ケーブルモデム用チューナ
SG55266A1 (en) * 1997-01-15 1999-04-27 Koninkl Philips Electronics Nv Multi-tuner receiver
JPH11127086A (ja) * 1997-08-19 1999-05-11 Alps Electric Co Ltd Ｕｈｆ及びｖｈｆ共用チューナ
JP3949389B2 (ja) * 2001-03-30 2007-07-25 アルプス電気株式会社 デュアル型デジタルテレビジョンチューナ
JP2002368642A (ja) * 2001-06-08 2002-12-20 Sony Corp 受信機およびｉｃ
US7447491B2 (en) * 2003-06-06 2008-11-04 Silicon Laboratories Inc. Multi-tuner integrated circuit architecture utilizing frequency isolated local oscillators and associated method
CN100379157C (zh) * 2003-06-24 2008-04-02 松下电器产业株式会社 高频接收装置、其使用的集成电路和电视接收机
KR101067774B1 (ko) * 2004-09-03 2011-09-28 엘지전자 주식회사 방송 수신기 및 그의 튜너 제어 방법

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CN101156339A (zh) 2008-04-02
US20080090542A1 (en) 2008-04-17
WO2006105916A1 (fr) 2006-10-12

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