CN102752566A - Circuit arrangement for providing high deviation mode and method for operating broadcast signal receiver - Google Patents
Circuit arrangement for providing high deviation mode and method for operating broadcast signal receiver Download PDFInfo
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- CN102752566A CN102752566A CN2012101140965A CN201210114096A CN102752566A CN 102752566 A CN102752566 A CN 102752566A CN 2012101140965 A CN2012101140965 A CN 2012101140965A CN 201210114096 A CN201210114096 A CN 201210114096A CN 102752566 A CN102752566 A CN 102752566A
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Abstract
The present invention relates to a circuit arrangement for providing high deviation mode and a method for operating a signal receiver, wherein the broadcast signal receiver comprises an audio processing unit for demodulating digital signals; in a normal mode, the audio processing unit outputs audio information contained in the digital signals; in a high deviation mode, the audio processing unit performs compensation on the effect caused by over-modulation; a stereo detection unit can use a proper filter and/or a demodulator FM threshold effect to detect the existence of non-mono audio information in the digital signals; the high deviation mode is released response for stereo detection; and the error releasing for the high deviation mode can be avoided because of detecting a low audio level lowering to be unheard ( the low audio level is generally related to contents and does not always indicate the changing of a transmission modulation index).
Description
Technical field
Embodiments of the invention relate to the circuit arrangement of high deviation (deviation) pattern of the audio treatment unit that is used for release (release) broadcast signal receiver device.Other embodiment relate to the method that operation has the broadcast signal receiver device of high deviation pattern.
Background technology
Broadcast television signal comprises one or more voice signals of the composite video signal of describing image content and the audio content of describing television channel.To vision signal, the various video standard is defined, and to voice signal, multiple audio standard is defined.
Some audio standards, A2 audio standard for example uses FM (warbled) sound carrier of two separation.In the situation of stereo sound (stereo) transmission; Main sound carrier carries the synthetic main voice signal as left and right sides voice-grade channel, and second sound carrier can carry the other voice signal of a voice-grade channel in the expression voice-grade channel or the differential signal of left and right sides voice-grade channel.In the situation of monophony (monaural) transmission, main sound carrier carries monaural channel, and second sound carrier can not exist.NICAM (near the instantaneous companding audio-frequency multiplex) standard provides main sound carrier that is used to provide monophonic signal and the subcarrier that carries digital signal, and digital stereo sound channel of its expression, two be digital mono acoustic channel, clear data channel, or the monophonic sounds and the data channel of combination independently.Other audio standards that are used for television broadcasting and audio broadcasting provide the non-mono audio information that is modulated on the single sound carrier.For example, left and right sides voice-grade channel synthetic can be used as the baseband signal transmission and differential signal can be modulated on the subcarrier that takies the frequency range beyond the baseband signal.
In some zones, the modulation of voice signal can change along with the time in same broadcast channel.For example, transmission of mono and stereo transmission can be taken in same broadcast channel each other.For example, in emerging nation, main voice signal usually maybe be to main sound carrier transition modulation, for example between the commercial advertisement transmission period, to cause concern during the stage of transmission of mono.Can be observed the transition modulation of one of percentage up to the specified FM deviation of standardization thousand.Traditionally; The TV machine provides high deviation pattern; And the TV machine is that cost is accepted the sound carrier through the modulation of unusual high transition with the stereo sound playback capability, because transition modulation and stereo transmission repel each other in many standards (for example, consulting B/G, D/K alphanumeric codes).The beholder can discharge this high deviation pattern through manually being provided with.
Summary of the invention
An object of the present invention is to provide more user-friendly broadcast receiver.This purpose realizes through the theme that utilizes independent claims.Other embodiment are designated in the dependent claims respectively.
According to an aspect of the present invention; A kind of circuit arrangement is provided; Comprise: audio treatment unit; This audio treatment unit is configured to demodulated digital signal; And that output is comprised in said digital signal in first receiver mode and at least the first sound carrier modulated non-mono audio information, said audio treatment unit also is configured in second receiver mode, to regulate said first sound carrier is carried out the effect that the main voice signal of transition modulation produces because of the transition modulation with compensation; Stereo sound detecting unit, this stereo sound detecting unit are configured to export there is non-mono audio information in indication in said digital signal stereo sound detection signal; And control unit, this control unit is configured in response to said stereo sound detection signal said audio treatment unit switched to said first receiver mode.
According to a further aspect in the invention, a kind of integrated circuit is provided, it comprises above-mentioned circuit arrangement.
According to a further aspect in the invention, a kind of television equipment is provided, it comprises above-mentioned circuit arrangement, and wherein, broadcast channel is the television broadcasting channel that comprises the TV signal carrier wave and at least the first sound carrier.
According to another aspect of the invention; A kind of method of operating the broadcast signal receiver device is provided; This method comprises: the control audio processing unit is operated in second receiver mode, with what recover to be comprised in the digital signal first sound carrier is carried out the main voice signal of transition modulation and the effect that compensation produces because of the transition modulation; Said digital signal is assessed in existence to non-mono audio information in the stereo sound detecting unit; And when detecting said non-mono audio information, said audio treatment unit is switched to first receiver mode to export the non-mono audio information that is comprised in the said digital signal.
According to another aspect of the invention; A kind of television equipment is provided; Comprise: audio treatment unit, this audio treatment unit are configured to digital signal is carried out demodulation, wherein; In first receiver mode; Said audio treatment unit export comprised in the said digital signal and at least the first sound carrier modulated non-mono audio information, and in second receiver mode, regulate said first sound carrier carried out the effect that the main voice signal of transition modulation produces because of the transition modulation with compensation; Stereo sound detecting unit, this stereo sound detecting unit are configured to export there is non-mono audio information in indication in said digital signal stereo sound detection signal; And control unit, this control unit is configured in response to said stereo sound detection signal said audio treatment unit switched to said first receiver mode.
According to another aspect of the invention; A kind of television equipment is provided; Comprise: apparatus for processing audio, this apparatus for processing audio are used for digital signal is carried out demodulation, wherein; In first receiver mode; Said apparatus for processing audio export comprised in the said digital signal and at least the first sound carrier modulated non-mono audio information, and in second receiver mode, regulate said first sound carrier carried out the effect that the main voice signal of transition modulation produces because of the transition modulation with compensation; Stereo sound checkout gear, this stereo sound checkout gear are used for exporting indication and have the stereo sound detection signal of non-mono audio information in said digital signal, and said stereo sound checkout gear is connected to said apparatus for processing audio; And control device, said control device is used in response to said stereo sound detection signal said apparatus for processing audio being switched to said first receiver mode, and said control device is connected to said apparatus for processing audio and said stereo sound checkout gear.
Details of the present invention and advantage will be from becoming more obvious below in conjunction with accompanying drawing to the description of embodiment.The characteristic of each embodiment can be combined, only if they repel each other.
Description of drawings
Fig. 1 is the schematic block diagram that can in high deviation pattern, operate and comprise the broadcast signal receiver device of the circuit arrangement that is used to discharge high deviation pattern according to one embodiment of the invention.
Fig. 2 A is the schematic block diagram of stereo sound detecting unit of the filter of the existence that is used for confirming non-mono audio information of the use according to an embodiment.
Fig. 2 B is the schematic block diagram of stereo sound detecting unit of the signal detector of the existence that is used for confirming non-mono audio information of the use according to an embodiment.
Fig. 2 C is the schematic block diagram of stereo sound detecting unit of the demodulator FM threshold value effect of the existence that is used for confirming non-mono audio information of the use according to an embodiment.
Fig. 2 D is the schematic representation according to the detector cell of the stereo sound detecting unit of Fig. 2 C of another embodiment.
Fig. 3 A illustrates the schematic frequency diagram of carrier wave detecting unit to the low pass filter effect of the digital input signals that goes out from the signal branch that comprises composite video signal and sound carrier.
Fig. 3 B is the schematic frequency diagram that illustrates the band pass filter effect of carrier wave detecting unit in the situation of sound carrier that digital input signals at the carrier wave detecting unit comprises the analysis frequency place.
The input signal that Fig. 3 C is shown in the carrier wave detecting unit does not comprise the band pass filter effect of carrier wave detecting unit in the situation of the sound carrier that is in analysis frequency.
Fig. 4 be relevant with the carrier detecting circuit of separating, according to the schematic block diagram of the audio treatment unit of an embodiment.
Fig. 5 A is the schematic frequency diagram that is used to illustrate the signal that comprises composite video signal, main sound carrier and sub-sound carrier of effect of the present invention.
Fig. 5 B be used to illustrate effect of the present invention comprise composite video signal and through the schematic frequency diagram of the signal of the main sound carrier of transition modulation.
Fig. 6 is the schematic state diagram of audio treatment unit that is used to illustrate the effect of embodiments of the invention.
Fig. 7 is the simplified flow chart according to the method for the operation broadcast signal receiver device of another embodiment.
Embodiment
Hereinafter, embodiments of the invention are described.It is important that the embodiment that notices all descriptions hereinafter can make up by any way, that is, do not exist some description embodiment can not with the restriction of other embodiment combinations.In addition, it should be noted that run through each figure in same numeral represent same or similar element.Should be understood that other embodiment can be utilized and can make structure and logical changes without departing from the scope of the invention.Therefore, following detailed is not considered to have limited significance, but scope of the present invention is defined by the following claims.But should be understood that the characteristic combination with one another of each embodiment described here, only if draw attention to especially.
Fig. 1 relates to a kind of broadcast signal receiver device 900, and this broadcast signal receiver device 900 for example receives analog broadcast signal via RF (radio frequency) antenna 901, wire and cable connector 902 or satellite receiving equipment 903.Broadcast singal can use a plurality of carrier frequencies to transmit a plurality of broadcast channels, and wherein broadcast channel can be radio channel or television channel.Each broadcast channel can comprise one or more sound carriers that comprise audio content.Television broadcasting channel also comprises composite video signal, and this composite video signal comprises the brightness that is described in the picture in the video flowing that transmits in each television broadcasting channel and the information of colourity.
This broadcast signal receiver device 900 can be independent radio receiver device or TV tuner, perhaps can be integrated in TV machine, video recording device, be equipped with the handheld communication unit of TV function or have in the computer (for example multimedia computer) of TV function.Broadcast singal can be to meet (the Comit é Consultatif International des Radiocommunications by CCIR; Comite Consultatif International de Radi) television standard of alphanumeric codes definition and utilize NTSC (National Television System Committee; NTSC) standard, PAL (phase alternating line; Line-by-line inversion) standard or SECAM (S é quentiel couleur à m é moire; Colored and the storage of transmission in order) radio signal or the TV signal of S-SYSTEM are for example utilized PAL-N, PAL-I, PAL-B, PAL-D, PAL-K, NTSC-M, SECAM-L, SECAM-B or SECAM-G.
In first transmission mode (normal mode, multitone is pattern frequently), non-mono audio information is transmitted in the broadcasting station, for example stereo or double-tone frequency information.Non-mono audio information can comprise also can not comprise other numerical datas that do not relate to audio-frequency information.Audio-frequency information can be modulated on a sound carrier or two sound carriers.For example; Main voice signal and sub-voice signal can be modulated on first sound carrier; Wherein main acoustic information can be used as baseband signal and on first sound carrier, is transmitted, and sub-voice signal can use, and the sub-sound carrier beyond the baseband signal modulated, that have main voice signal is transmitted on first sound carrier.According to another embodiment, main voice signal is modulated on first sound carrier, and sub-voice signal is modulated on second sound carrier, and wherein, first and second sound carriers are modulated on identical broadcast carrier.
In second transmission mode; The mode that first sound carrier is modulated with main voice signal transition in the broadcasting station on first sound carrier, sends main voice signal; Wherein, the horizontal exceeding of main voice signal produces a hundred per cent of main sound carrier is modulated necessary value.
In first receiver mode (normal mode, multitone frequently pattern), audio treatment unit 120 outputs are perhaps modulated non-mono audio information on first and second sound carriers on first sound carrier of broadcast channel and subcarrier for example.In second receiver mode (high deviation pattern), audio treatment unit 120 is only exported each main voice signal and is abandoned the signal that obtains from the signal path that subcarrier or second sound carrier is carried out demodulation.Main voice signal is conditioned, and for example, is attenuated or is attenuated also quilt equilibrium, perhaps, before demodulation, utilizes than filter wideer in first receiver mode and is modulated in the effect that in the main voice signal of demodulation, produces because of transition with compensation by filtering.
When transmitted in first transmission mode broadcasting station, stereo sound detecting unit 150 received and comprises the digital input signals that is modulated at the sub-voice signal on first or second sound carrier.This input signal is in fact corresponding to the baseband version of broadcast singal modulated on the carrier frequency of broadcast channel.In the situation of non-mono audio information transmission, this input signal is included in sub-voice signal modulated on first or second sound carrier or modulated digital signal on carrier wave at least.There is the stereo sound detection signal of sub-voice signal in the 150 output indications of stereo sound detecting unit in input signal.Control unit 190 receives this stereo sound detection signal, and the 120 current just operations in second receiver mode (high deviation pattern) of supposition audio treatment unit, then audio treatment unit 120 is switched to first receiver mode, thereby discharges high deviation pattern.
According to illustrated embodiment among Fig. 2 A, stereo sound detecting unit 150 comprises sub-voice signal filter cell 151a, and sub-voice signal filter cell 151a is configured to let the sub-voice signal that comprises in the digital signal pass through.When there is sub-voice signal in the indication of the output signal of group voice signal filter cell 151a, sub-voice signal detecting unit 151b output stereo sound detection signal.Sub-voice signal can be modulated on first sound carrier.For example, sub-voice signal detecting unit 151b allows the sub-voice signal of indication according to BTSC or EIAJ standard code, perhaps allows indication in the FM radio signal, to have the L-R subsignal.According to another embodiment, sub-voice signal can be modulated on second sound carrier.
Fig. 2 B relates to such an embodiment, and wherein stereo sound detecting unit 150 comprises digital signal detecting unit 151c, existence that digital signal detecting unit 151c indication comprises in digital signal, modulated subsignal through digital modulation on carrier wave.For example, there is the signal according to the NICAM standard code in digital signal detecting unit 151c indication.
Fig. 2 C relates to the detection to the non-mono audio information of on first and second sound carriers that digital signal comprised, modulating.For this reason, stereo sound detecting unit 150 can comprise carrier wave detecting unit 151d, and carrier wave detecting unit 151d is configured to export indication exists second sound carrier or sub-sound carrier in digital signal carrier sense signal as the stereo sound detection signal.For example through the frequency spectrum of the main voice signal of transition modulation be provided in the situation that the band pass filter scope that detects second sound signal overlaps, through detecting narrow carrier wave but not the existence of wide voice signal provide stereo sound to detect can be more reliable.According to an embodiment, the method can be applied to two kinds of sound carrier standards according to B/G and D/K alphanumeric codes.
In order to confirm the existence of second sound carrier, carrier wave detecting unit 151d demodulator FM capable of using threshold value effect.The all component of carrier wave detecting unit 151d can be set to open in 120 minutes with audio treatment unit.Other embodiment can provide resource-sharing to the sub-sound demodulation paths and the carrier wave detecting unit 151d of audio treatment unit 120.
Carrier wave detecting unit 151d receives digital input signals, this digital input signals be in fact with frequency shift (FS) the broadcast singal of tuned frequency corresponding through modulating information signal.This through modulating information signal comprise receiver unit by be tuned to broadcast channel in the digital multiplexing baseband version of the voice signal that comprised, and comprise two quadrature components.Low pass prefilter unit 152 can be configured to be used for being suppressed at the band exterior portions that possibly comprise through modulating information signal, for example, and through the video signal components of frequency shift (FS).The upper cut off frequency of prefilter unit 152 fully height passes through with the major part in the sideband energy of the base band of permission expression voice signal.For example, this major part can be for about 98 percent, and the upper cut off frequency of prefilter unit 152 can be corresponding to Carson (Carson) bandwidth through modulating information signal.On the other hand, the upper cut off frequency of prefilter unit 152 is fully low to suppress the band exterior portions and will represent that the base band of the voice signal in modulating information signal separates from video signal components.According to an embodiment, the upper cut off frequency of prefilter unit 152 in the scope of 180kHz, for example is about 150kHz at 50kHz.According to an embodiment; 152 outputs of prefilter unit are through the digital signal of LPF; This digital signal can comprise stereophonic signal, two different monophonic signals; Perhaps be modulated onto monophonic signal and digital signal on main sound carrier and the sub-sound carrier respectively, perhaps can carry out the monophonic signal of transition modulation main sound carrier.
Be not more than a half of the minimum frequency distance between two sound carriers that in various standards, define when the deviation between analysis frequency and the sub-sound carrier frequency, analysis frequency is corresponding to sub-sound carrier.
Broadband noise produces because of demodulator FM threshold value effect; According to this; At certain more than the input signal level; SNR (signal to noise ratio) is along with the input signal level slowly increases in the demodulator output signal, and is lower than this certain input signal level, and SNR reduces along with the input signal level and sharply descends in the demodulator output signal.In the situation of the voice signal a little less than digital signal does not comprise sub-sound carrier or only comprises, demodulator is mainly exported broadband noise.Relatively, comprise in the situation of sub-sound carrier demodulator unit 154 output band-limited signals in digital signal.Little deviation between analysis frequency and the sub-sound carrier frequency in fact only has contribution to DC (direct current) part in the demodulator output signal; And when large deviation being arranged between analysis frequency and the signal carrier or not having any signal carrier, demodulation will generate strong broadband noise in test signal.
Carrier wave detecting unit 151d also comprises band- pass filter unit 156, and 156 pairs of test signals of band-pass filter unit are carried out filtering and had the maximum bandwidth passband in addition of the information signal of on sub-sound carrier, modulating and can be audio signal or data-signal.Test signal through filtering is outputed to detecting unit 158.When test signal comprised sound or information signal, filter cell 156 was decayed to it, and has only low signal power or do not have signal power in the filtering test signal, can the detecting of output place of filter cell 156.Otherwise; When making test signal accounted for when leading by broadband noise owing to demodulator FM threshold value effect, the part of broadband noise will drop in the passband of filter cell 156 and can in the filtering test signal, detect the noise signal that has than large-signal power.
According to an embodiment, the voice signal of on second sound carrier, modulating comprises the acoustic information from 0Hz to 15kHz.In this situation, the lower limiting frequency of filter cell 156 can be 15kHz or higher, for example is higher than the upper limiting frequency 10 of this voice signal at least.Filter cell 156 can be a band pass filter, and its upper cut off frequency is confirmed as and makes expected parasitic disturbance or interfering frequency appear at outside the passband.For example, interfering frequency appears at harmonic wave or other repeating signal places of the line frequency in the vision signal usually.Through the decay in the voice signal branch, signal still can appear in the restituted signal.According to another embodiment, filter cell 156 can be a band pass filter, and its upper cut off frequency depends on or stems from the sampling rate according to the Nyquist theorem.
Fig. 2 D illustrates an embodiment of detector cell 158.Detector cell 158 can comprise that peak detection unit 158a and threshold value confirm unit 158b.Peak detecting unit 158a can detect the peak amplitude in filtering signal.Threshold value confirms that unit 158b can drop to the signal level that comes the switched carrier detection signal below the predetermined threshold or above predetermined threshold in response to the peak amplitude through filtering signal.According to another embodiment, detector cell 158 can comprise integrator unit, this integrator unit at the fixed time during the section to carrying out integration through filtering signal, wherein threshold value is confirmed comparing through filtering signal and predetermined threshold after unit 158b is with integration.
Fig. 3 A illustrates the effect of function subelement of the carrier wave detecting unit 151d of Fig. 2 C in more detail to the diagrammatic sketch of Fig. 3 C.The schematically illustrated spectral range 380 of Fig. 3 A through modulating information signal (it is the digital input signals of carrier wave detecting unit 151d).Has upper limiting frequency fa through modulating information signal.The cut-off frequency fb of the passband 390 of the prefilter unit 152 of Fig. 3 A is chosen as greater than limit frequency fa and is lower than the lower frequency limit of band exterior portions, and said band exterior portions can be comprised in the digital multiplexing baseband signal and can produce because of the demodulation to the broadcast singal of sampling in the earlier stage.
Fig. 3 B is illustrated in sub-sound carrier is present in the demodulator unit 154 of Fig. 2 C in the situation in modulating information signal with analysis frequency the spectral range 320 of output signal.Test signal is corresponding to the base band voice signal with limit frequency f0, and limit frequency f0 generally is about 15kHz, and wherein, f0 is lower than the first limit frequency fa through modulating information signal.The passband 310 of the filter cell 156 of Fig. 2 C is chosen as and makes it not overlap with the spectral range of base band voice signal.The cut-off frequency fb of the prefilter unit 152 that for example, lower limiting frequency f1 can be through Fig. 2 C defines.In addition, passband 310 can be chosen as and make and can be suppressed because of the measurable interference signal that produce and that appear at frequency f 3 places of the processing in the earlier stage.For example, passband 310 can have the upper cut off frequency f2 between 200kHz and 400kHz, for example is about 300kHz.
Fig. 3 B relates to the function of the filter cell 156 of Fig. 2 C in the situation that in the signal that offers demodulator unit 154, has sub-sound carrier.Signal power concentrates in the spectral range 320 and in passband 310, only has weak signal or do not have signal.Being used to assess detector cell through the filtering test signal detects and does not have signal or have only low signal amplitude or signal power.
Fig. 3 C relates to the situation that does not have sound carrier at the analysis frequency place.Because FM threshold value effect, the demodulator unit 154 of Fig. 2 C generates broadband noise.Noise spectrum 330 overlaps with passband 310, thereby makes and in filter passband 310, have noise.Strong noise signal power or strong noise signal amplitude that detector cell 158 detects in filtering signal.Filter cell is provided as the pass filter with the upper cut off frequency that is lower than measurable parasitic frequency (such as the harmonic wave of line frequency) has increased the reliability of noise measuring.
Fig. 4 relates to the embodiment that in main sound demodulator path, comprises the first demodulator unit 124a and in sub-sound demodulator path, comprise the audio treatment unit 120 of the second demodulator unit 124b.The first demodulator unit 124a generates the baseband version of main voice signal; That said main voice signal for example comprises left and right sides voice-grade channel and signal; And the second demodulator unit 124b generates the baseband version of sub-voice signal, and said sub-voice signal for example comprises the signal of one of differential signal or left and right sides voice-grade channel of left and right sides voice-grade channel.In sub-sound demodulator path, stereo sound detecting unit 150 indicates whether to exist non-monophonic sound tone signal.Stereo sound detecting unit 150 can with the second demodulator unit 124b shared resource.For example, stereo sound detecting unit 150 can use the side information that in the second demodulator unit 124b, generates.Audio signal recovery unit 128 can be set up, and this audio signal recovery unit 128 recovers left and right sides audio channel signals from main voice signal and sub-voice signal, and the exportable numerical data that for example is coded in the sub-voice signal.
According to an embodiment, in main sound demodulator path, audio treatment unit 120 comprises transition modulation detection unit 160, the transition modulation condition that transition modulation detection unit 160 detects on the main sound carrier.According to an embodiment, assessment hang oneself restituted signal or in transition modulation detection unit 160 from the audio signal level of voice-grade channel, for example through the envelope (envelope) or the peak value of assessment through restituted signal.Transition modulation detection unit 160 can output to control unit 190 and control unit 190 can switch to second receiver mode (high deviation pattern) with audio treatment unit 120 when the transition modulation condition is detected with the transition modulated detection signal.According to another embodiment, high deviation pattern only just is being used when both detecting the transition modulation and not detecting second sound carrier simultaneously.
Compensating unit 162 can be only in high deviation pattern effectively and in stereo mode or standard mono pattern by bypass or transparent.In high deviation pattern, compensating unit 162 can be decayed and/or balanced main voice signal.During conventional transmission of mono,, can be provided for the signal of left and right acoustic channels according to traditional approach through superpose according to common mode main voice signal and sub-voice signal.According to an embodiment, control unit 190 can make the information from sub-sound demodulator path that abandons.In the substituting of these compensation methodes or except these compensation method, in high deviation pattern, other parameters that are used for demodulation that the first demodulator unit 124a can be controlled as beyond using in the normal mode compensate the effect that produces because of the transition modulation.
According to another embodiment, noise detection unit 170 can be provided in the main sound demodulator path.For example, noise detection unit 170 can be used the side information that in the second demodulator unit 124b, generates.For example, the amount that noise detection unit 170 can be for example changes through the assessment amplitude and frequency (when noise exists, this two all high) indicate whether noise accounts for leading in the frequency range that mainly voice signal can be anticipated.According to another embodiment, noise detection unit 170 can be configured to detect by the main voice signal through the transition modulation and take and noise in the frequency range that do not taken by the main voice signal without the transition modulation.Control unit 190 can discharge second receiver mode and audio treatment unit 120 exportable monophony sound audio-frequency informations then, and the effect that uncompensation produces because of the transition modulation.Make do not having standard monophonic transmission second sound carrier or sub-sound carrier, that modulate without transition also can discharge high deviation pattern even detect the existence of noise in the main sound demodulator path in accordance with under the situation of transition modulation condition.
For example; During channel scanning, do not have aerial signal or do not have in the obtainable situation of sound carrier signal; The first demodulator unit 124a can produce high-level noise, and this high-level noise can make transition modulation detection unit 160 indication transition modulation conditions and audio treatment unit 120 can be switched to high deviation pattern.If in the period of back, the broadcasting station is transmitted in the monophonic signal that does not wherein have second sound carrier to be detected, then high deviation pattern will can not be released automatically.Even in this case, noise detection unit 170 also allows to discharge high deviation pattern.
According to another embodiment, the information that the indication receiver unit has switched to another broadcast channel can be used to determine whether to discharge high deviation pattern.For example; But control unit 190 receive channels change signal, transition modulated detection signal, carrier sense signal and by the noise detecting signal of noise detection unit 170 outputs, and can be controlled at through the subelement of control audio processing unit 120 between high deviation and the normal receiving mode and switch.For example, switch and get back to normal mode and can trigger, perhaps when detecting second sound carrier or when in main sound demodulator path, detecting noise, be triggered through channel-changing through discharging high deviation pattern.For example through using transition to modulate the part (for example commercial advertisement) that transmits its program and follow in the situation that the TV study plot transmits other parts (for example conventional program), transformation is possible and hopes at the TV program.
According to an embodiment, audio treatment unit 120 comprises the first configurable filter 122a as main sound filter, its let first sound carrier that comprises main voice signal through and stop second sound carrier and composite video signal.The control unit 190 may command first configurable filter 122a is to use wideer passband in second receiver mode (high deviation pattern) than in first receiver mode.According to another embodiment, audio treatment unit 120 comprises the second configurable filter 122b as sub-sound filter, its let second sound carrier that comprises sub-voice signal through and stop first sound carrier and composite video signal.The control unit 190 may command second configurable filter 122b is to use narrower passband in second receiver mode (high deviation pattern) than in first receiver mode.Configurable filter allows in the situation of stereo transmission, to carry out good stereo sound separation and in high deviation pattern, carries out highly reliable subcarrier and detect.
Fig. 4 relates to the demodulator that is used for two sound carrier systems and the parallel layout of configurable filter.Be equal to and consider to be applicable to such sound carrier system, its neutron voice signal is modulated and after the first demodulator unit 124a, can come out from main sound demodulator path branches in sub-sound demodulator path on main sound carrier.
Whether no longer compared so that confirm main voice signal with the audio level of the main sound carrier of assessment by the conventional method of transition modulation; Circuit arrangement with audio treatment unit 120 is more reliable, because temporary transient low relevant with the content usually and not necessarily change of indication transmission modulation index to noiseless little audio level.But, comprise that this circuit arrangement of audio treatment unit 120, stereo sound detecting unit 150 and control unit 190 detects the condition that is used to discharge high deviation pattern reliably, and need not other user interactions and user's setting.
Each of signal processing unit 100, audio treatment unit 120, stereo sound detecting unit 150 and control unit 190 and their subelement can make up with hardware, software or its and realize.Some or all unit and subelement thereof can be integrated in the mutual encapsulation, for example are integrated among IC (integrated circuit), ASIC (application-specific integrated circuit (ASIC)) or the DSP (digital signal processor).
Fig. 5 A illustrates the frequency spectrum of analog TV broadcast singal, this analog TV broadcast singal have composite video signal 510 and according to as the A2 alphanumeric codes that in B/G and D/K standard, the use conventional voice signal of encoding.The main voice signal 520 that comprises synthetic left channel and right-hand signal is modulated on main sound carrier f1, and it is modulated on sub-sound carrier f2 to comprise the sub-voice signal 530 of right audio channel signals.Main and sub-sound carrier f1 is relative with f2, and picture signal 510 has frequency shift (FS).Frequency shift (FS) and sub-sound carrier that main sound carrier has 5.5MHz or 6.5MHz can have the for example frequency shift (FS) of 6.2578125MHz, 6.7421875MHz or 5.7421875MHz.The passband 512,522,532 that is used for picture filter, main sound filter and sub-sound filter defines by standard separately usually.
Fig. 5 B illustrates the frequency spectrum in the situation of the main voice signal 522 of transition modulation.Usually, the transition of main voice signal modulation means transmission of mono and sub-sound carrier in the frequency spectrum of Fig. 5 B, do not occur.Because the frequency spectrum through the main voice signal 522 of transition modulation possibly overlap with the passband 532 of the sub-sound filter of standard, so possibly become unreliable to the detection (it is only based on signal energy) of the existence of second sound carrier.And for stereo transmission; The passband 522 and 532 of the main and sub-voice signal shown in Fig. 5 A shows optimum; In high deviation pattern; The main sound filter that has than broad passband 522a allows to recover the voice signal that main sound carrier is carried out the transition modulation better, and has the sub-sound filter permission carrier wave detection more reliably of narrower passband.
The state that Fig. 6 illustrates audio treatment unit 120 changes.In first receiver mode 601, audio treatment unit output is in the main voice signal of modulating on first sound carrier and the audio-frequency information or the digital information of on first or second sound carrier, modulating.In second receiver mode 602; Audio treatment unit is discarded in the other audio-frequency information of modulating on first or second sound carrier; For example, only drawing the signal that is provided for audio frequency output from main voice signal does not perhaps have other audio frequency or digital information to use to other processing unit indication.First state change 612 from normal mode to high deviation pattern only is triggered through the transition modulation or does not exist second acoustic information to trigger through transition modulation and while.Second state from high deviation pattern to mode standard change 621 can be through carrying out by the user channel-changing, the existence through detecting non-mono audio information or trigger through the noise measuring the main sound demodulator path, but for example in being contemplated to the frequency range of main voice signal or taken in the frequency range that is not taken by main voice signal without the transition modulation by main voice signal through the transition modulation.
Fig. 7 relates to the method for operation broadcast signal receiver device.The broadcast singal that audio treatment unit is controlled to being received carries out demodulation, first sound carrier is carried out the main voice signal (702) of transition modulation with output.Test the signal (704) that is received to the existence of non-monophonic audio signal.When non-mono audio information was detected, audio treatment unit was controlled to output at main voice signal of modulating on first sound carrier and the audio-frequency information (706) on first or second sound carrier, modulated in addition.
According to an embodiment, can detect the existence of non-mono audio information through the existence of assessing second sound carrier.Test to the existence of second sound signal and can comprise the broadcast singal that comes demodulation to be received with predetermined analysis frequency corresponding to sub-sound carrier frequency; Wherein, Test signal is obtained; When digital signal was not included in the sub-voice signal carrier wave at analysis frequency place and does not have broadband noise in addition or low-level broadband noise is arranged, this test signal comprised high-level broadband noise.Test signal utilizes passband to be located at filter cell beyond the maximum bandwidth of voice signal modulated on the second sound signal carrier wave by filtering; Wherein, Generate test signal from test signal through filtering; And wherein, indicate the existence of second sound carrier at the signal level that in the test signal of filtering, is lower than predetermined threshold.
Though illustrated and described specific embodiment at this; But those of ordinary skills it should be understood that multiple alternate embodiment can be arranged under the situation of the scope that does not break away from described embodiment and/or be equal to implementation and substitute specific embodiment shown and description.The application is intended to cover any change or the distortion of the specific embodiment of this argumentation.Therefore, be intended to, the present invention is only limited by claim and equivalent thereof.
Claims (25)
1. a circuit arrangement comprises
Audio treatment unit; This audio treatment unit is configured to demodulated digital signal; And that output is comprised in said digital signal in first receiver mode and at least the first sound carrier modulated non-mono audio information, said audio treatment unit also is configured in second receiver mode, to regulate said first sound carrier is carried out the effect that the main voice signal of transition modulation produces because of the transition modulation with compensation;
Stereo sound detecting unit, this stereo sound detecting unit are configured to export there is non-mono audio information in indication in said digital signal stereo sound detection signal; And
Control unit, this control unit are configured in response to said stereo sound detection signal said audio treatment unit switched to said first receiver mode.
2. circuit arrangement according to claim 1, wherein, said stereo sound detecting unit comprises
Sub-voice signal filter cell, this sub-voice signal filter cell are configured to let the second sound signal that is comprised in the said digital signal pass through, and
Sub-voice signal detecting unit, this sub-voice signal detecting unit are configured to when the output signal of said sub-voice signal filter cell indicates said second sound signal to exist, export said stereo sound detection signal.
3. circuit arrangement according to claim 1, wherein, said stereo sound detecting unit comprises
Digital signal detecting unit, this digital signal detecting unit be configured to indicate be included in the said digital signal, the existence of modulated subsignal through digital modulation on carrier wave.
4. circuit arrangement according to claim 1, wherein, in said first receiver mode, said audio treatment unit is exported non-mono audio information modulated on said first sound carrier and second sound carrier, and
Said stereo sound detecting unit comprises the carrier wave detecting unit, and this carrier wave detecting unit is configured to export there is said second sound carrier in indication in said digital signal carrier sense signal as said stereo sound detection signal.
5. circuit arrangement according to claim 4, wherein
Said carrier wave detecting unit is suitable for using demodulator FM threshold value effect to confirm the existence of said second sound carrier.
6. circuit arrangement according to claim 4, wherein, said carrier wave detecting unit comprises
Demodulator unit; This demodulator unit is configured to analysis frequency said digital signal carried out demodulation to generate test signal; When said digital signal did not comprise the carrier signal that is in said analysis frequency and do not comprise broadband noise in addition or comprise low-level broadband noise, said test signal comprised high-level broadband noise;
Filter cell; This filter cell is configured to have the passband beyond the maximum bandwidth that is located at information signal modulated on said second sound carrier; And said test signal is carried out filtering, to generate test signal through filtering from said test signal; And
Detector cell, this detector cell are configured to signal level when said test signal through filtering and drop to predetermined threshold and generate said carrier sense signal when following.
7. circuit arrangement according to claim 6, wherein
When said analysis frequency during corresponding to the frequency of said second sound carrier, said test signal comprises said information signal.
8. circuit arrangement according to claim 1 also comprises
Excessive modulation detection unit, this excessive modulation detection unit is configured to detect the excessive modulation of said first sound carrier, wherein
Said control unit also is configured in response to the detection that the transition of said first sound carrier is modulated said audio treatment unit switched to said second receiver mode.
9. circuit arrangement according to claim 1 also comprises
Noise detection unit, this noise detection unit whether be configured to detect in the frequency range that is assigned to said first sound carrier noise account for leading, wherein
Said control unit also is configured in the indication of said noise detection unit is being assigned to the said first frequency scope of said first sound carrier noise and accounts for when leading, controls said audio treatment unit and discharges said second receiver mode and output mono audio information and do not mend and taste the effect that produces because of the transition modulation.
10. circuit arrangement according to claim 1 also comprises
First configurable filter; This first configurable filter is applied to the said digital signal before the demodulation; To obtain said main voice signal; Wherein, said first configurable filter is controlled as the wideer passband of application in said second receiver mode than in said first receiver mode.
11. circuit arrangement according to claim 10 also comprises
Second configurable filter; This second configurable filter is applied to the said digital signal before the demodulation; To obtain non-mono audio information; Wherein, said second configurable filter is controlled as the narrower passband of application in said second receiver mode than in said first receiver mode.
12. an integrated circuit comprises circuit arrangement according to claim 1.
13. a television equipment comprises circuit arrangement according to claim 1, wherein, broadcast channel is the television broadcasting channel that comprises TV signal carrier wave and said at least first sound carrier.
14. a method of operating the broadcast signal receiver device, this method comprises
The control audio processing unit is operated in second receiver mode, with what recover to be comprised in the digital signal first sound carrier is carried out the main voice signal of transition modulation and the effect that compensation produces because of the transition modulation;
Said digital signal is assessed in existence to non-mono audio information in the stereo sound detecting unit; And
When detecting said non-mono audio information, said audio treatment unit is switched to first receiver mode to export the non-mono audio information that is comprised in the said digital signal.
15. method according to claim 14, wherein
Assess said digital signal to the existence of non-mono audio information and comprise said digital signal is carried out bandpass filtering letting the sub-voice signal that is comprised in the said digital signal pass through,
Be evaluated at and in the digital signal of bandpass filtering, whether have sub-voice signal.
16. method according to claim 14, wherein
Assess said digital signal to the existence of non-mono audio information and comprise whether the said digital signal of assessment is included in the subsignal through digital modulation modulated on the carrier wave.
17. method according to claim 14, wherein
Assess said digital signal to the existence of non-mono audio information and comprise that the existence to second sound carrier assesses said digital signal, and
Switch to said first receiver mode and comprise output modulated non-mono audio information on said first sound carrier and said second sound carrier.
18. method according to claim 17 wherein, is assessed said digital signal to the existence of second sound carrier and is comprised
With predetermined analysis frequency received digital signal is carried out demodulation; Wherein test signal is obtained; When said digital signal did not comprise the carrier signal that is in said analysis frequency and do not comprise broadband noise in addition or comprise low-level broadband noise, said test signal comprised high-level broadband noise;
The filter cell that use has the passband beyond the maximum bandwidth that is located at information signal modulated on said second sound carrier comes said test signal is carried out filtering; To generate test signal through filtering from said test signal; Wherein, said signal level in the signal of filtering is lower than the existence that predetermined threshold is indicated said second sound signal carrier wave.
19. method according to claim 14 also comprises
When said audio treatment unit was in said first receiver mode, whether the test received digital signal comprised first sound carrier through the transition modulation, and if comprise,
Then said audio treatment unit is switched to said second receiver mode.
20. method according to claim 14 also comprises
When said audio treatment unit was in said first receiver mode, whether the test received digital signal comprised first sound carrier through the transition modulation, and simultaneously, had only non-mono audio information to exist, and if like this,
Then said audio treatment unit is switched to said second receiver mode.
21. method according to claim 14 also comprises
Before demodulation, said digital signal is carried out filtering to obtain said main voice signal, wherein, in said second receiver mode than in said first receiver mode, use the effect that wideer passband produces because of the transition modulation with compensation.
22. method according to claim 21 also comprises
Before demodulation, said digital signal is carried out filtering to obtain non-mono audio information, wherein, in said second receiver mode than in said first receiver mode, use narrower passband.
23. a television equipment comprises
Audio treatment unit; This audio treatment unit is configured to digital signal is carried out demodulation; Wherein, in first receiver mode, said audio treatment unit export comprised in the said digital signal and at least the first sound carrier modulated non-mono audio information; And in second receiver mode, adjusting is carried out the main voice signal of transition modulation with the effect of compensation because of transition modulation generation to said first sound carrier;
Stereo sound detecting unit, this stereo sound detecting unit are configured to export there is non-mono audio information in indication in said digital signal stereo sound detection signal; And
Control unit, this control unit are configured in response to said stereo sound detection signal said audio treatment unit switched to said first receiver mode.
24. television equipment according to claim 23, wherein
In said first receiver mode, said audio treatment unit is exported non-mono audio information modulated on said first sound carrier and second sound carrier, and
Said stereo sound detecting unit comprises the carrier wave detecting unit, and this carrier wave detecting unit is configured to export there is said second sound carrier in indication in said digital signal carrier sense signal as said stereo sound detection signal.
25. a television equipment comprises
Apparatus for processing audio; This apparatus for processing audio is used for digital signal is carried out demodulation; Wherein, in first receiver mode, said apparatus for processing audio export comprised in the said digital signal and at least the first sound carrier modulated non-mono audio information; And in second receiver mode, adjusting is carried out the main voice signal of transition modulation with the effect of compensation because of transition modulation generation to said first sound carrier;
Stereo sound checkout gear, this stereo sound checkout gear are used for exporting indication and have the stereo sound detection signal of non-mono audio information in said digital signal, and said stereo sound checkout gear is connected to said apparatus for processing audio; And
Control device, said control device are used in response to said stereo sound detection signal said apparatus for processing audio being switched to said first receiver mode, and said control device is connected to said apparatus for processing audio and said stereo sound checkout gear.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
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| EP11003378.4 | 2011-04-21 | ||
| EP11003378 | 2011-04-21 |
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| CN102752566A true CN102752566A (en) | 2012-10-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101140965A Pending CN102752566A (en) | 2011-04-21 | 2012-04-16 | Circuit arrangement for providing high deviation mode and method for operating broadcast signal receiver |
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