CN104184975B - DTV STB signal processing method and device - Google Patents
DTV STB signal processing method and device Download PDFInfo
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- CN104184975B CN104184975B CN201410438120.XA CN201410438120A CN104184975B CN 104184975 B CN104184975 B CN 104184975B CN 201410438120 A CN201410438120 A CN 201410438120A CN 104184975 B CN104184975 B CN 104184975B
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Abstract
The present invention relates to electronic communication field, there is provided a kind of DTV STB signal processing method and device.Signal processing method that the present invention is provided, it is necessary to including：The power spectrum of cable TV signal is read, the power spectrum is obtained by carrying out full frequency band sampling to cable TV signal.Judge whether the power spectrum of cable TV signal channel meets preparatory condition, the preparatory condition is determined according to the power spectrum characteristic of the channel of bearing digital television signal.If the power spectrum characteristic of cable TV signal channel is unsatisfactory for preparatory condition, according to the parameter of the set of frequency wave filter of channel.Signal processing method and device provided in an embodiment of the present invention, therefore the occupation mode of the different cable TV signal channel in adaptive each department can be directed to, so as to be filtered the configuration of device automatically.
Description
Technical field
The present invention relates to the method and dress of electronic communication field, more particularly to a kind of DTV STB signal transacting
Put.
Background technology
DTV STB is used to receive digital television signal, to reach more preferable reception, logarithm
The wave filter of word TV set-top box is configured, and the nonnumeric TV signal carried on the different channel of cable TV signal is entered
Row filtering process.
The type for the signal that different regions are carried using same channel is different, and for same channel, some areas can be used for
Bearing digital television signal, and other areas can be used for carrying anolog TV signals or the signal of other business.Therefore, exist
Different regions are, it is necessary to for occupation mode of this area for cable TV signal mid band, by wave filter to nonnumeric electricity
Processing is filtered depending on signal, so as to avoid the normal play formation interference to DTV.
Wave filter can allow useful signal to pass through undampedly in the frequency range of setting, and reflect garbage signal.
When the existing wave filter to DTV STB is configured, nonnumeric TV signal is carried by pre-recorded this area
Channel frequency, different filters are then carried out to the DTV STB applied to different regions according to the frequency recorded
Ripple device is configured, so as to be filtered processing to nonnumeric TV signal, it is to avoid the normal play formation to DTV is disturbed.
At present, the problem of at least having following in existing technology：Because different regions make in cable TV signal channel
The difference used, causing the set top box of DTV needs the difference regarding territory of use, is believed by the nonnumeric TV of recording carrying
Number channel frequency mode use different wave filter configuration parameters, production have different configuration of digital television top
Box.The configuration of this wave filter is fixed, and adaptability is poor, and being only applicable to an area has fixed channel user
The filtering process of the cable TV signal of formula, is unable to when channel occupation mode changes, adaptive this conversion.
The content of the invention
The embodiment provides a kind of method and device of top box of digital machine signal transacting, so as to adaptive
Occupation mode of the different regions for cable TV signal channel.
In an embodiment of the present invention, on the one hand, there is provided a kind of technology of DTV STB signal processing method
Scheme, comprises the following steps：The power spectrum of cable TV signal is read, the power spectrum is sampled by full frequency band and obtained.Judge
Whether the power spectrum of each channel of cable TV signal meets preparatory condition.According to the set of frequency for the channel for being unsatisfactory for preparatory condition
The parameter of wave filter is simultaneously filtered processing to the cable TV signal.
In an embodiment of the present invention, on the other hand there is provided a kind of device of DTV STB signal transacting, bag
Include：Read module, the power spectrum for reading cable TV network signal, affiliated power spectrum is sampled by full frequency band and obtained.Work(
Rate spectral condition determining module, for judging whether the power spectrum of each channel of cable TV signal meets preparatory condition.Wave filter, is used
In being filtered processing to cable TV signal.Wave filter setup module, for the frequency according to the channel for being unsatisfactory for preparatory condition
Rate sets the parameter of wave filter.
In the technical scheme that the embodiments of the present invention are provided, because the power spectrum characteristic of digital television signal is in office
Where area is all identical, therefore sets preparatory condition according to the power spectrum characteristic of digital television signal, is unsatisfactory for preparatory condition
Channel be the channel for carrying nonnumeric TV signal, pass through according to be unsatisfactory for preparatory condition channel set of frequency filter
Device to nonnumeric TV signal so as to being filtered processing.By the technical scheme that the embodiment of the present invention is provided is basis
Power spectrum characteristic determines to carry the channel of nonnumeric TV signal, rather than by recording the predetermined nonnumeric TV of carrying
The frequency parameter of the channel of signal configures wave filter, therefore can the adaptive different cable TV signal channel in each department
Occupation mode, is set top box in production, with being provided convenience in goods, installation, maintenance so as to be filtered the configuration of device automatically.
Brief description of the drawings
Fig. 1 is the flow chart of the key step of signal processing method provided in an embodiment of the present invention；
Fig. 2 is the flow chart of one embodiment of signal processing method provided in an embodiment of the present invention；
Fig. 3 is the flow chart of another embodiment of signal processing method provided in an embodiment of the present invention；
The frequency sets that Fig. 4 constitutes for the successive channel provided in an embodiment of the present invention for determining the nonnumeric TV signal of carrying
Flow chart；
Fig. 5 is the flow chart of another embodiment of signal processing method provided in an embodiment of the present invention；
Fig. 6 is the flow chart of another embodiment of signal processing method provided in an embodiment of the present invention；
Fig. 7 is the structural representation of signal processing apparatus provided in an embodiment of the present invention；
Fig. 8 is the structural representation of signal handling equipment provided in an embodiment of the present invention；
Fig. 9 is the embodiment of the logic step performed by processor in signal handling equipment provided in an embodiment of the present invention
Flow chart.
Embodiment
In the embodiment of the present invention, preparatory condition is set according to the power spectrum characteristic of digital television signal, default bar is unsatisfactory for
The channel of part is the channel for carrying nonnumeric TV signal, is filtered by the set of frequency according to the channel for being unsatisfactory for preparatory condition
Ripple device, therefore can the adaptive different cable TV signal in each department so as to be filtered processing to nonnumeric TV signal
The occupation mode of channel, so as to be filtered the configuration of device automatically.
In order that technical problem solved by the invention, technical scheme and it is effective be more clearly understood, below in conjunction with
Drawings and Examples, the present invention is described in more detail.It should be appreciated that specific embodiment described herein is only to solve
The present invention is released, is not intended to limit the present invention.
Those skilled in the art are it is to be understood that the channel described in following examples is band frequency section, with lower limit frequency
Rate and upper limiting frequency, it is necessary to cable TV signal before judging whether cable TV signal includes nonnumeric TV signal
Power spectrum sampling is carried out, so as to obtain the power spectrum of cable TV signal.
As shown in figure 1, the technical scheme for the signal processing method that the embodiment of the present invention is provided is mainly included the following steps that：
S101, the power spectrum for reading cable TV signal channel, the power spectrum are complete by being carried out to cable TV signal
Frequency range sampling is obtained.
S102, judge whether the power spectrum of cable TV signal channel meets preparatory condition, the preparatory condition is basis
What the power spectrum characteristic of the channel of bearing digital television signal was determined, if it is not, then continue executing with step S103, if so, can be after
It is continuous cable TV signal is demodulated to wait handle, to obtain digital television signal.For each channel, if its power
Spectrum meets default condition, then can be determined that its carrying is digital television signal, if its power spectrum is unsatisfactory for default condition,
Then can be determined that its carrying is non-digital television signal.
S103, be unsatisfactory for according to power spectrum preparatory condition channel set of frequency wave filter parameter and to described wired
TV signal is filtered processing.For wave filter parameter setting be mainly the upper frequency limit that is filtered to wave filter and
The setting of lower-frequency limit, and the channel for being unsatisfactory for preparatory condition according to power spectrum determine to set the number of wave filter.
Further, it the processing such as can be demodulated to the signal after filtering process, to obtain digital television signal.
Above-mentioned flow can be performed by DTV STB or similar data television signal receiving and processing equipment.
By above description as can be seen that the embodiment of the present invention, sets pre- according to the power spectrum characteristic of digital television signal
If condition, the channel for being unsatisfactory for preparatory condition is the channel for carrying nonnumeric TV signal.Default bar is unsatisfactory for by basis
The set of frequency wave filter of the channel of part to nonnumeric TV signal so as to being filtered processing.Due to the embodiment of the present invention
The technical scheme provided is the channel for determining to carry nonnumeric TV signal according to power spectrum characteristic, rather than pre- by record
The frequency of the channel of the nonnumeric TV signal of carrying first determined sets wave filter, thus can adaptively each department it is different
The occupation mode of cable TV signal channel so as to being filtered the configuration of device automatically, be set top box production, with goods, installation,
Provided convenience in maintenance.
In step S101, the power spectrum of cable TV signal can be carried out by all-band tuner to cable TV signal
Sampling, and then be converted in power spectrum signal, the present invention by utilizing it in DTV STB to cable TV signal
Sampled and be converted to power spectrum.
Generally, the bandwidth of nonnumeric TV signal and the bandwidth of digital television signal of some types are differed, some classes
The bandwidth of the nonnumeric TV signal of type is identical with digital television signal, but the level value of signal waveform or signal is different.
Based on above signal characteristic, the embodiment of the present invention preferably, believe by the bandwidth for being digital television signal with the first bandwidth, DTV
Number bandwidth be equal to a width of example of the first band, in step s 102, carried for each channel in cable TV signal
Signal performs following steps：Whether the bandwidth for determining channel is the first bandwidth, if it is not, then judge channel power spectrum be unsatisfactory for it is pre-
If condition, if so, then being sampled to the power spectrum of the channel, and judge whether the signal level value of sampled point meets default model
Enclose.If it is not, then judging that the power spectrum of channel is unsatisfactory for preparatory condition.If so, then judging that the power spectrum of channel meets preparatory condition.
Because some nonnumeric TV signals are identical with the bandwidth of digital television signal, but its level can be obtained by signal sampling
Value, and then judge its waveform, by the comparison with the level value and waveform of digital television signal, can confirm that it is non-number
Word TV signal.
Such as, the bandwidth of digital television signal and analog signal is 8M, and the bandwidth of other nonnumeric TV signals is higher
Or it is lower, for example, the band of eoc signal a width of 16M, 26M or 50M etc..According to above step S102, preparatory condition can be set
For, it is first determined the bandwidth of the signal carried on the current channel in cable TV signal whether 8M bandwidth, can so recognize
Go out most types of nonnumeric TV signal.Secondly, if the bandwidth of the signal carried on current channel is 8M, due to numeral
The waveform of TV signal is relatively flat, and the waviness of analog signal is larger, therefore, the obtained level value of analog signal
Change should be larger, therefore more just can confirm that the signal carried on current channel by the signal level value between sampled point
Whether it is digital television signal.
Preferably, in step s 103, the channel of preparatory condition can be unsatisfactory for for each power spectrum, setting one is right
The wave filter answered, the lower frequency limit and upper limiting frequency of the channel of preparatory condition are unsatisfactory for according to each power spectrum, set corresponding
Wave filter parameter.By just setting a wave filter to carry out it each channel for carrying nonnumeric TV signal
Filtering process, the step of simplifying filtering process.
In another embodiment of the present invention, it is preferable that in step s 103, frequency spectrum signature can be unsatisfactory for presetting
The continuous channel composition of condition is channel set.The continuous channel institute group of preparatory condition is unsatisfactory for for each power spectrum
Into channel set, set a corresponding wave filter；According to the lower frequency limit and the corresponding wave filter of upper limiting frequency setting
Parameter.The channel set that the continuous channel that power spectrum is unsatisfactory for preparatory condition is constituted represents one section and carries nonnumeric electricity
Depending on the continuous frequency band of signal, its lower frequency limit and lower frequency limit and upper limiting frequency that upper limiting frequency is exactly the frequency band.It is logical
The frequency band for confirming continuously to carry nonnumeric TV signal is crossed, and wave filter is set in units of the continuous frequency band
Processing is filtered to it, the number of the wave filter used is reduced, the step of optimizing filtering process has saved resource.
Those skilled in the art will be seen that the configuration for wave filter can be in related device in embodiments of the present invention
After power down again upper electricity when reset, can so meet same device from an area be transferred to another it is regional when it is again right
The need for wave filter is configured.
Fig. 2 exemplarily gives a kind of one embodiment for signal processing method that the embodiment of the present invention is provided,
It is that wherein n is institute using channel as judging whether cable TV signal includes the unit of nonnumeric TV signal in the present embodiment
There is the count value of channel, N is carries the count value of the channel of nonnumeric TV signal, and the initial value that n initial value is 1, N is 0.
And in the present embodiment, a width of 8M of band that preparatory condition is set to channel and signal level value is relatively flat.The reality that Fig. 2 is provided
Example is applied to comprise the following steps；
S201, full frequency band sampling is carried out to cable TV signal, and read its power spectrum.
Whether S202, the bandwidth for judging n-th of channel are 8M.If step S203 is then performed, if otherwise performing step
S209.In the present embodiment, the first bandwidth 8M has been taken as, so that reach will be exhausted in addition to analog signal with interference signal
Most of nonnumeric TV signals confirm the purpose come.The deterministic process judges since the 1st channel, due to DTV
Signal and a width of 8M bandwidth of the band of analog signal, and the band of eoc signal a width of 16M, 26M or 50M etc., other nonnumeric TV letters
Number band it is a width of higher or lower, therefore by this step, can by digital television signal and analog signal with other such as
The signal distinguishing of eoc signal etc comes.When the bandwidth of n-th of channel is not 8M, it is possible to judge to hold on the channel
The signal of load is nonnumeric TV signal, is to need to be filtered the signal of processing.And when n-th each channel a width of 8M of band when
Wait, then need to be further processed.
S203, the power spectrum on n-th of channel is sampled, perform step S204.
Whether S204, the signal level value according to the sampled point obtained in S203, it is several to judge the signal on n-th of channel
Word TV signal.If so, step S210 is then performed, if it is not, then performing step S205.The level of digital television signal is more put down
It is smooth, therefore difference between signal level value should be smaller, should be within ± 5db.
S205, the signal level value according to the sampled point obtained in S203, judge whether n-th of channel is null tone road.If
It is then to perform step S210, if it is not, then performing step S206.The level value in null tone road is very low, therefore the number of its signal level value
Value should very little, typically should be below -90dbm.Because the signal in null tone road is for digital television signal, it is impossible to shape
Into larger interference, therefore processing need not be filtered for null tone road to it.
S206, judge that the signal carried on n-th of channel, as analog signal or interference signal, continues executing with step
S207。
S207, record corresponding channel, and n=n+1, N=N+1, perform step S208.The corresponding channel of record includes
The bandwidth of channel number and channel.The lower frequency limit and upper limiting frequency of the channel can be obtained according to these information of record.
S208, judge n-th of channel upper limiting frequency whether be less than or equal to 1GHz.If otherwise performing step S212,
If it is return and perform step S201.It regard 1GHz as the higher limit of predeterminated frequency scope, predeterminated frequency in this embodiment
Scope is 0-1GHz.Just as described above, frequency where digital television signal exists not over 1GHz, therefore for upper limiting frequency
More than 1GHz channel is just not necessarily to be judged again, because affirming no digital television signal on this channel.
The signal level value that S209, basis are obtained, judges whether n-th of channel is null tone road.If then performing step
S210, if otherwise performing step S211.
S210, n=n+1, continue executing with step S208.
S211, the lower frequency limit and upper limiting frequency, n=n+1, N=N+1 for recording n-th of channel, continue executing with step
S208。
S212, setting wave filter, and processing is filtered to nonnumeric TV signal.In the present embodiment, it is for pre-
If the channel that each carries nonnumeric TV signal in frequency range, just a wave filter is set to be filtered processing, and root
According to the lower frequency limit and upper limiting frequency setting filter parameter of each channel of record.If for example, having 16 in the present embodiment
Individual channel carries nonnumeric TV signal, then just should set a wave filter to each channel of this 16 channels
Processing is filtered, 16 wave filters, and the lower frequency limit and upper limit frequency of each of which channel according to record are set altogether
Rate sets the relevant parameter of wave filter.
Fig. 3 exemplarily gives a kind of another embodiment for signal processing method that the embodiment of the present invention is provided.
It is that, using channel as judging whether cable TV signal includes the unit of nonnumeric TV signal, wherein n is in the present embodiment
The count value of all channels, N is carries the count value of the channel of nonnumeric TV signal, and n initial value is for 1, N initial value
0.The embodiment that Fig. 3 is provided comprises the following steps：
S301, full frequency band sampling is carried out to cable TV signal, and read its power spectrum.
Whether S302, the bandwidth for judging n-th of channel are 8M.If step S303 is then performed, if otherwise performing step
S309.8M herein is i.e. as the first bandwidth, so that reach will be most non-in addition to analog signal with interference signal
Digital television signal confirms the purpose come.The deterministic process judges since the 1st channel, due to digital television signal and mould
Intend a width of 8M bandwidth of band of signal, and the band of other signals is a width of higher or lower, therefore by this step, can be by numeral
TV signal and analog signal and the signal distinguishing of other such as eoc signals etc come.When the bandwidth of n-th of channel is not 8M
When, it is possible to judge that the signal carried on the channel, as nonnumeric TV signal, is to need to be filtered the signal of processing.
And when the band of n-th each channel a width of 8M, then need to be further processed.
S303, the power spectrum to n-th of channel are sampled, and perform step S304.
Whether S304, the signal level value according to the sampled point obtained in S303, it is several to judge the signal on n-th of channel
Word TV signal.If so, step S310 is then performed, if it is not, then performing step S305.The level of digital television signal is more put down
It is smooth, therefore difference between sampled point level value should be smaller.
S305, the signal level value according to the sampled point obtained in S303, judge whether n-th of channel is null tone road.If
It is then to perform step S310, if it is not, then performing step S306.The level value in null tone road is very low, therefore its sampled point level value
Numerical value should very little.Because the signal in null tone road is for digital television signal, larger interference can not form, therefore for
Processing need not be filtered for null tone road to it.
S306, judge that the signal carried on n-th of channel, as analog signal or interference signal, continues executing with step
S307。
S307, record corresponding channel, and n=n+1, N=N+1, perform step S308.
S308, judge n-th of channel upper limiting frequency whether be more than preset range higher limit, wherein preset range is pre-
The frequency range of digital television signal or nonnumeric TV signal is recognized the need for first setting.If it is step S312 is performed,
If otherwise returning and performing step S301.For the higher limit, for example, top box of digital machine needs to judge the 1st channel
Whether the signal on to the 256th channel is digital television signal, then terminal frequency is exactly the upper limit frequency of the 256th channel
Rate.
The level value that S309, basis are obtained, judges whether n-th of channel is null tone road.If then performing step S310, if
Otherwise step S311 is performed.
S310, n=n+1, continue executing with step S308.
S311, the lower frequency limit and upper limiting frequency, n=n+1, N=N+1 for recording n-th of channel, continue executing with step
S308。
S312, the successive channel composition of the nonnumeric TV signal of determination carrying frequency sets.This is holding according to record
Carry what lower frequency limit and the upper limiting frequency of the channel of nonnumeric TV signal were carried out, this step will be in order to continuously carry nonnumeric
The frequency band of TV signal merges filtering process, so as to reach the number saved and set wave filter, realizes preferably filtering
Effect.Its idiographic flow is as shown in figure 4, new in the flow shown in Fig. 4 introduce a variable M with to carrying nonnumeric TV
The frequency sets of the successive channel composition of signal are counted, and M is started counting up from 0, and the idiographic flow comprises the following steps.
Whether S401, the frequency band for judging M channel sets and N channels are continuous, if step S402 is then performed, if otherwise holding
Row step S404.When initially being judged, i.e. it is discontinuous when M=0, therefore directly execution step S404,
By M=1, and the frequency band that first N frequency bands represented are represented as M=1.
S402, N channels are included in M channel sets, and update the lower frequency limit and upper limiting frequency of M channel sets, and N=
N-1, performs step S403.
S403, judge N whether be less than or equal to 0, if otherwise return perform step S401, if so, then terminate determine carrying it is non-
The step of continuous frequency band of digital television signal.
S404, the lower frequency limit and upper limiting frequency, M=M+1 for recording M channel sets, M channel sets, N are included in by N channels
=N-1, continues executing with step S403.
S313, setting filter parameter, and processing is filtered to nonnumeric TV signal.
In the present embodiment for the continuous frequency band of each nonnumeric TV signal of carrying in the range of predeterminated frequency,
A wave filter is set to be filtered processing, i.e., for passing through the frequency representated by each M recorded in step as shown in Figure 4
Rate section sets a wave filter to be filtered processing.Such mode can both save the number of used wave filter, also may be used
To realize more preferable filter effect.Finally, the continuous frequency band of nonnumeric TV signal is carried according to each recorded
Lower frequency limit and upper limiting frequency, and filter parameter is set according to the lower frequency limit and upper limiting frequency.
Fig. 5 exemplarily gives a kind of another embodiment for signal processing method that the embodiment of the present invention is provided.
S501, full frequency band sampling is carried out to cable TV signal, and read its power spectrum.
Whether S502, the bandwidth for judging n-th of channel are 8M.If step S503 is then performed, if otherwise performing step
S509.In the present embodiment, the first bandwidth 8M has been taken as, so that reach will be exhausted in addition to analog signal with interference signal
Most of nonnumeric TV signals confirm the purpose come.The deterministic process judges since the 1st channel, due to DTV
Signal and a width of 8M bandwidth of the band of analog signal, the band of other signals are a width of higher or lower, therefore by this step, can be with
Digital television signal and analog signal and the signal distinguishing of other such as eoc signals etc are come.When the bandwidth of n-th of channel
It is to need to be filtered processing when not being 8M, it is possible to judge the signal carried on the channel as nonnumeric TV signal
Signal.And when the band of n-th of channel a width of 8M, then need to be further processed.
S503, the power spectrum to n-th of channel are sampled, and perform step S504.
Whether S504, the signal level value according to the sampled point obtained in S503, it is several to judge the signal on n-th of channel
Word TV signal.If so, step S510 is then performed, if it is not, then performing step S505.The level of digital television signal is more put down
It is smooth, therefore difference between sampled point level value should be smaller.
S505, the signal level value according to the sampled point obtained in S503, judge whether n-th of channel is null tone road.If
It is then to perform step S510, if it is not, then performing step S506.The level value in null tone road is very low, therefore its sampled point level value
Numerical value should very little.Because the signal in null tone road is for digital television signal, it is impossible to form larger interference, thus it is right
Processing need not be filtered to it for null tone road.
S506, judge that the signal carried on n-th of channel, as analog signal or interference signal, continues executing with step
S507。
S507, record corresponding channel, and n=n+1, N=N+1, perform step S508.The corresponding channel of record includes
The bandwidth of channel number and channel.The lower frequency limit and upper limit frequency of the channel are can be obtained by by these information of record
Rate.
S508, judge n-th channel whether be cable TV signal last channel.If it is step is performed
S512, step S501 is performed if otherwise returned.
The level value that S509, basis are obtained, judges whether n-th of channel is null tone road.If then performing step S510, if
Otherwise step S511 is performed.
S510, n=n+1, continue executing with step S508.
S511, the lower frequency limit and upper limiting frequency, n=n+1, N=N+1 for recording n-th of channel, continue executing with step
S508。
S512, setting wave filter, and processing is filtered to nonnumeric TV signal.
In the present embodiment, it is, for the frequency band representated by the channel of each nonnumeric TV signal of carrying, just to set
Put a wave filter and be filtered processing, and the lower frequency limit and the upper limit of the frequency band according to representated by each channel of record
Set of frequency filter parameter.If for example, there is 16 channels to carry nonnumeric TV signal in the present embodiment, then just should
When each channel to this 16 channels sets a wave filter to be filtered processing, 16 wave filters are set altogether, and
The relevant parameter of wave filter is set according to the lower frequency limit of each of which channel of record and upper limiting frequency.
Fig. 6 exemplarily gives a kind of another embodiment for signal processing method that the embodiment of the present invention is provided.
It is using channel as judging whether cable TV signal includes the unit of nonnumeric TV signal in the present embodiment.Fig. 6 is provided
Embodiment comprise the following steps.
S601, full frequency band sampling is carried out to cable TV signal, and read its power spectrum.
Whether S602, the bandwidth for judging n-th of channel are 8M.If step S603 is then performed, if otherwise performing step
S609.In the present embodiment, the first bandwidth 8M has been taken as, so that reach will be exhausted in addition to analog signal with interference signal
Most of nonnumeric TV signals confirm the purpose come.The deterministic process judges since the 1st channel, due to DTV
Signal and a width of 8M bandwidth of the band of analog signal, and a width of 16M of the band of eoc signal, the band of other signals are a width of higher or more
It is low, therefore by this step, can be by digital television signal and analog signal and the signal distinguishing of other such as eoc signals etc
Come.When the bandwidth of n-th of channel is not 8M, it is possible to judge that the signal carried on the channel is believed as nonnumeric TV
Number, it is to need to be filtered the signal of processing.And when the band of n-th each channel a width of 8M, then need further located
Reason.
S603, the power spectrum to n-th channel sample=, perform step S604.
Whether S604, the signal level value according to the sampled point obtained in S603, it is several to judge the signal on n-th of channel
Word TV signal.If so, step S610 is then performed, if it is not, then performing step S605.The level of digital television signal is more put down
It is smooth, therefore difference between sampled point level value should be smaller.
S605, the signal level value according to the sampled point obtained in S603, judge whether n-th of channel is null tone road.If
It is then to perform step S610, if it is not, then performing step S606.The level value in null tone road is very low, therefore its sampled point level value
Numerical value should very little.Because the signal in null tone road is for digital television signal, larger interference can not form, therefore for
Processing need not be filtered for null tone road to it.
S606, judge that the signal carried on n-th of channel, as analog signal or interference signal, continues executing with step
S607。
S607, record corresponding channel, and n=n+1, N=N+1, perform step S608.
S608, judge n-th channel whether be cable TV signal last channel.If it is step is performed
S612, step S601 is performed if otherwise returned.
The level value that S609, basis are obtained, judges whether n-th of channel is null tone road.If then performing step S610, if
Otherwise step S611 is performed.
S610, n=n+1, continue executing with step S608.
S611, the lower frequency limit and upper limiting frequency, n=n+1, N=N+1 for recording n-th of channel, continue executing with step
S608。
S612, the successive channel composition of the nonnumeric TV signal of determination carrying channel set.This is holding according to record
Carry what lower frequency limit and the upper limiting frequency of the frequency band of nonnumeric TV signal were carried out, this step will be in order to continuously carry non-number
The frequency band of word TV signal merges filtering process, so as to reach the purpose for saving the number for setting wave filter.Its is specific
Flow is as shown in figure 4, new in the flow shown in Fig. 4 introduce a variable M with to carrying the continuous of nonnumeric TV signal
The channel set of channel composition is counted, and M is started counting up from 0, and the idiographic flow comprises the following steps.
Whether S401, the frequency band for judging M channel sets and N channels are continuous, if step S402 is then performed, if otherwise holding
Row step S404.When initially being judged, i.e. it is discontinuous when M=0, therefore directly execution step S404,
By M=1, and the frequency band that first N frequency bands represented are represented as M=1.
S402, N channels are included in M channel sets, and update the lower frequency limit and upper limiting frequency of M channel sets, and N=
N-1, performs step S403.
S403, judge N whether be less than or equal to 0, if otherwise return perform step S401, if so, then terminate determine carrying it is non-
The step of continuous frequency band of digital television signal.
S404, the lower frequency limit and upper limiting frequency, M=M+1 for recording M channel sets, M channel sets, N are included in by N channels
=N-1, continues executing with step S403.
S613, setting filter parameter, and processing is filtered to nonnumeric TV signal.
Constituted in the present embodiment for each successive channel for carrying nonnumeric TV signal of cable TV signal
Channel set, set a wave filter be filtered processing, i.e., for passing through each M recorded in step as indicated at 4
The frequency band of channel set sets a wave filter to be filtered processing.Such mode can save used wave filter
Number.Finally, the lower frequency limit and the upper limit of the continuous frequency band of nonnumeric TV signal are carried according to each recorded
Frequency, and filter parameter is set according to the lower frequency limit and upper limiting frequency.
For above method flow, the embodiment of the present invention also provides a kind of technical scheme of signal processing apparatus, the program
Particular content be referred to the above method implementation, will not be repeated here.
As shown in fig. 7, a kind of technical scheme of signal processing apparatus provided in an embodiment of the present invention, including：
Read module 701, the power spectrum for reading cable TV network signal channel, the power spectrum passes through to wired
TV signal carries out full frequency band sampling and obtained.Power spectral condition determining module 702, judges the power spectrum of cable TV signal channel
Whether preparatory condition is met, and the preparatory condition is determined according to the power spectrum characteristic of the channel of bearing digital television signal.
Filter module 703, for being filtered processing to cable TV signal.Wave filter setup module 704, for according to power spectrum
It is unsatisfactory for the parameter of the set of frequency wave filter of the channel of preparatory condition.
Preferably, power spectral condition determining module 702 is as follows specifically for being performed for the channel in cable TV signal
Step：According to the power spectrum of channel, whether the bandwidth for determining channel is the first bandwidth.If it is not, then judging the power spectrum on channel
It is unsatisfactory for preparatory condition.If so, then being sampled to power spectrum, and judge whether the signal level value of sampled point meets default model
Enclose.If it is not, then judging that the power spectrum of channel is unsatisfactory for preparatory condition.
Preferably, wave filter setup module 704 is also particularly useful for the channel that preparatory condition is unsatisfactory for according to power spectrum, it is determined that
Power spectrum is unsatisfactory for the channel set of the continuous channel composition of preparatory condition.Preparatory condition is unsatisfactory for for each power spectrum
Continuous channel composition channel set, set a corresponding wave filter.Determine that each power spectrum is unsatisfactory for default bar
The lower frequency limit and upper limiting frequency of the channel set of the channel composition of part, and according to the lower frequency limit and upper limiting frequency setting pair
The parameter for the wave filter answered.
Preferably, wave filter setup module 704 can also be specifically for being unsatisfactory for preparatory condition for each power spectrum
Channel, set a corresponding wave filter.Be unsatisfactory for according to each power spectrum preparatory condition channel lower frequency limit with
Upper limiting frequency, sets the parameter of corresponding wave filter.
Preferably, wave filter setup module 704 can also be specifically on the set-top box after electricity, resetting the ginseng of wave filter
Number.
Signal processing apparatus is provided for the present embodiment, wherein each module can be arranged in same entity apparatus,
Can certainly be multiple entity devices being independently arranged.
A kind of signal handling equipment provided in an embodiment of the present invention as shown in Figure 8, including processor 801, memory 802,
User interface 803, EBI 804 and wave filter 805.Wherein, processor 801, memory 802 and user interface 803, filtering
Connected between device 805 by EBI 804.
Processor 801 is used for the power spectrum for reading cable TV signal channel, and the power spectrum is by believing cable television
Number carry out full frequency band sampling obtain.Judge whether the power spectrum of cable TV signal channel meets preparatory condition, the default bar
Part is determined according to the power spectrum characteristic of the channel of bearing digital television signal.The frequency of preparatory condition is unsatisfactory for according to power spectrum
The parameter of the set of frequency wave filter in road.The channel that control wave filter 805 is unsatisfactory for preparatory condition to power spectrum is filtered place
Reason.
Memory 802 is used for the frequency that storage power composes the channel for the condition that is unsatisfactory for.
The channel that wave filter 805 is used to be unsatisfactory for power spectrum condition is filtered processing.
User interface 803 is used to export the TV signal handled after filtering.
Preferably, processor 801 is additionally operable to perform following steps for the channel of cable TV signal：According to the work(of channel
Rate is composed, and whether the bandwidth for determining channel is the first bandwidth.If it is not, then judging that the power spectrum of channel is unsatisfactory for preparatory condition.If so,
Then power spectrum is sampled, and judges whether the signal level value of sampled point meets preset range.If it is not, then judging channel
Power spectrum is unsatisfactory for preparatory condition.
Preferably, processor 801 is additionally operable to be unsatisfactory for the channel of preparatory condition according to power spectrum, determines that power spectrum is unsatisfactory for
The channel set of the continuous channel composition of preparatory condition.The continuous channel of preparatory condition is unsatisfactory for for each power spectrum
The channel set of composition, sets a corresponding wave filter.Determine that each power spectrum is unsatisfactory for the channel composition of preparatory condition
Channel set lower frequency limit and upper limiting frequency, and according to the lower frequency limit and the corresponding wave filter of upper limiting frequency setting
Parameter.
Preferably, processor 801 can be also used for being unsatisfactory for the channel of preparatory condition for each power spectrum, set one
Individual corresponding wave filter.The lower frequency limit and upper limiting frequency of the channel of preparatory condition are unsatisfactory for according to each power spectrum, is set
The parameter of corresponding wave filter.
Preferably, after processor 801 is also particularly useful for electricity on the set-top box, filter parameter is reset.
Here signal handling equipment can be implemented with various means.For example, these technologies can with hardware, software or
Their combination is realized.Realize that the processor (such as the processor 801 shown in Fig. 8) of device can be at one for hardware
Or multiple application specific integrated circuit (English abbreviations：ASIC), digital signal processor (English abbreviation DSP), digital signal processor
Part (English abbreviation：DSPD), PLD (English abbreviation：PLD), field programmable gate array (English abbreviation：
FPGA), processor, controller, microcontroller, microprocessor, and be designed for realizing the other of function described herein
Electronic unit, or combinations thereof are realized.
For software implementation, these technologies can be with realizing the module of function described herein (such as program, function
Deng) realize.Software code can be stored (such as the memory 802 shown in Fig. 8), and in memory by processor (for example
Processor 801) perform.Memory can be realized in processor or outside processor.
It can be used for performing following process step as shown in figure 9, processor 801 as shown in Figure 8 is specific：
S901, the power spectrum for reading cable TV signal channel.
S902, judge whether the power spectrum of cable TV signal channel meets preparatory condition.If so, then performing step S903
If it is not, then performing step S904.
S903, judge whether current channel is last channel, if so, step S906 is then performed, if otherwise performing step
Rapid S905.
S904, the channel number of the channel, upper limiting frequency, lower frequency limit be recorded into memory.And perform step S903.
S905, the power spectrum for continuing the reading next channel of cable TV signal.And return to execution step S902
S906, the continuous channel composition that frequency spectrum signature is unsatisfactory for preparatory condition are channel set.And pass through storage
Upper limiting frequency and the lower frequency limit of each channel determine the upper limiting frequency and lower frequency limit of each channel set.
S907, a wave filter 805 is set for each channel set.
S908, the parameter for setting wave filter 805 and wave filter 805 is controlled to be unsatisfactory for the channel of preparatory condition to power spectrum
It is filtered processing.Specially set what wave filter was filtered according to the upper limiting frequency of each channel set and lower frequency limit
The parameter of scope, and control wave filter to be filtered processing to each channel set.
Certainly in step s 907, processor can also be unsatisfactory for the channel of preparatory condition for each frequency spectrum signature
One wave filter is set.And the upper limiting frequency of the channel of preparatory condition is unsatisfactory for according to each frequency spectrum signature in S908
Wave filter is set with lower frequency limit, so as to be filtered the setting of the filter range parameter of device.
The signal processing method that the embodiment of the present invention is provided, by being held according to the channel of each in cable TV signal
The feature of the signal of load determines whether include nonnumeric TV signal in cable TV signal, and according to nonnumeric TV signal
Set of frequency wave filter parameter, processing is filtered to nonnumeric TV signal, can be to different in cable TV signal
The nonnumeric TV signal of frequency range is filtered processing, realizes so that DTV STB adapts to different cable TV signals
The occupation mode of channel, and then processing is filtered to nonnumeric TV signal therein, realize at the signal of without differences
Reason scheme.
The signal processing apparatus that the embodiment of the present invention is provided, can apply on DTV STB, pass through basis
The feature for the signal that the channel of each in cable TV signal is carried determines whether include nonnumeric electricity in cable TV signal
Depending on signal, and the parameter of the set of frequency wave filter according to nonnumeric TV signal, nonnumeric TV signal is filtered
Processing, can be filtered processing to the nonnumeric TV signal of different frequency range in cable TV signal, realize so that numeral
TV set-top box adapts to the occupation mode of different cable TV signal frequency ranges, and then nonnumeric TV signal therein is filtered
Ripple processing.
It should be understood by those skilled in the art that, embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the present invention can be using the reality in terms of complete hardware embodiment, complete software embodiment or combination software and hardware
Apply the form of example.Moreover, the present invention can be used in one or more computers for wherein including computer usable program code
The computer program production that usable storage medium is implemented on (including but is not limited to magnetic disk storage, CD-ROM, optical memory etc.)
The form of product.
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Figure and/or block diagram are described.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processor of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which is produced, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (8)
1. a kind of DTV STB signal processing method, it is characterised in that including：
The power spectrum of cable TV signal channel is read, the power spectrum is adopted by carrying out full frequency band to the cable TV signal
Sample is obtained；
Judge with the power spectrum determine bandwidth whether be bearing digital television signal channel the first bandwidth；
If it is not, judging that the power spectrum is unsatisfactory for preparatory condition, the preparatory condition is the frequency according to bearing digital television signal
What the power spectrum characteristic in road was determined；
If so, determining that the signal level value of sampled point is unsatisfactory for preset range, then judges the work(after being sampled to the power spectrum
Rate spectrum is unsatisfactory for preparatory condition；
When the power spectrum is unsatisfactory for preparatory condition, according to the parameter of the set of frequency wave filter of the channel.
2. the method as described in claim 1, it is characterised in that also include：On top box of digital machine after electricity, the wave filter is reset
Parameter.
3. the method as described in claim 1, it is characterised in that according to the parameter of the set of frequency wave filter of the channel, bag
Include：
It is channel set by the continuous channel composition that frequency spectrum signature is unsatisfactory for preparatory condition；
According to parameter of the lower frequency limit of each channel set with the corresponding wave filter of upper limiting frequency setting.
4. the method as described in claim 1 or 3, it is characterised in that according to the parameter of the set of frequency wave filter of the channel,
Including：
The channel or channel set of preparatory condition are unsatisfactory for for each power spectrum characteristic, a corresponding wave filter is set.
5. a kind of DTV STB signal processing apparatus, it is characterised in that including：
Read module, the power spectrum for reading cable TV signal channel, the power spectrum is by believing the cable television
Number carry out full frequency band sampling obtain；
Power spectral condition determining module, whether the bandwidth for judging to determine with the power spectrum is bearing digital television signal frequency
First bandwidth in road；If it is not, judging that the power spectrum is unsatisfactory for preparatory condition, the preparatory condition is according to bearing digital television
What the power spectrum characteristic of the channel of signal was determined；If so, determining the signal level value of sampled point not after being sampled to the power spectrum
Preset range is met, then judges that the power spectrum is unsatisfactory for preparatory condition；
Wave filter setup module, for when the power spectrum is unsatisfactory for preparatory condition, being filtered according to the set of frequency of the channel
The parameter of ripple device.
6. device as claimed in claim 5, it is characterised in that the wave filter setup module specifically for：Top box of digital machine
After upper electricity, the filter parameter is reset.
7. device as claimed in claim 5, it is characterised in that the wave filter setup module specifically for：
It is channel set by the continuous channel composition that frequency spectrum signature is unsatisfactory for preparatory condition；
According to parameter of the lower frequency limit of each channel set with the corresponding wave filter of upper limiting frequency setting.
8. device as claimed in claim 5, it is characterised in that the wave filter setup module specifically for：For each
Power spectrum characteristic is unsatisfactory for the channel or channel set of preparatory condition, sets a corresponding wave filter.
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|---|---|---|---|
| CN201410438120.XA CN104184975B (en) | 2014-08-29 | 2014-08-29 | DTV STB signal processing method and device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410438120.XA CN104184975B (en) | 2014-08-29 | 2014-08-29 | DTV STB signal processing method and device |
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| CN104184975B true CN104184975B (en) | 2017-10-27 |
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| CN201039324Y (en) * | 2007-04-30 | 2008-03-19 | 浙江省广电科技股份有限公司 | A portable digital TV monitor for automatic digital and analog signal recognition |
| CN101478656A (en) * | 2008-12-15 | 2009-07-08 | 北京创毅视讯科技有限公司 | Co-channel interference filtering method and apparatus therefor |
| CN101867701A (en) * | 2010-06-02 | 2010-10-20 | 四川虹微技术有限公司 | Device for inhibiting same frequency interferences of DTMB receiver |
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