CN109831208A - Measurement method and device - Google Patents
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- CN109831208A CN109831208A CN201910002290.6A CN201910002290A CN109831208A CN 109831208 A CN109831208 A CN 109831208A CN 201910002290 A CN201910002290 A CN 201910002290A CN 109831208 A CN109831208 A CN 109831208A
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- 238000005259 measurement Methods 0.000 abstract description 4
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Abstract
The invention discloses measurement method and devices, belong to telecommunications field.The present invention measures the effective range of the sampled point of actual microphone data-signal by the adjustment PDM microphone samples point delay value of stepping one by one；According to the settling time and retention time of the time margin of the actually active range computation data-signal of sampled point, the accuracy of measurement ensure that；Thus according to the target position of the settling time of time margin and the sampled point of retention time adjustment data-signal, to guarantee the stability of data signal transmission.
Description
Technical field
The present invention relates to telecommunications field more particularly to measurement method and devices.
Background technique
The digital audio interface (PDM) of microphone (micphone) is produced in electronics such as smart television, set-top box, intelligent sound boxes
On product using more and more common.The mode for generalling use manual calculations at present obtains the parameter (settling time of PDM sampling interface
TSETUP and retention time tHOLD) it is not accurate enough, it not can guarantee the stability of PDM sampling interface.Existing acquisition PDM interface ginseng
Several modes does not account for the delay (inside of default clock signal does not postpone) inside the clock signal of PDM interface, and
Do not account for PDM signal on the line and the problems such as chip interior has shake, delay, therefore not can guarantee in transmission process
The stability of PDM sampling interface.
Summary of the invention
Settling time and retention time for existing PDM sampling interface not accurate enough problem, now provide one kind and are intended to
The measurement method and device of the true value of settling time and retention time can be obtained.
The present invention provides a kind of measurement methods, are applied to microphone, and the measurement method includes the following steps:
The delay for adjusting the clock signal of the microphone measures the effective of the sampled point of the data-signal of the microphone
Range；
When obtaining settling time and the holding of the time margin of the data-signal according to the effective range of the sampled point
Between；
The sampled point of the data-signal is adjusted according to the settling time of the time margin and the retention time
Target position.
Preferably, the delay of the clock signal of the adjustment microphone, measures the data-signal of the microphone
The effective range of sampled point, comprising:
The delay for adjusting the clock signal of the microphone measures institute according to the data signal edge of the microphone
State the effective range of the sampled point of data-signal.
Preferably, the effective range of the sampled point are as follows: the position of the valid window of the sampled point of the data-signal.
Preferably, the effective range according to the sampled point obtains when the establishing of time margin of the data-signal
Between and the retention time, comprising:
According to the effective range of the sampled point of the data-signal, the settling time is calculated；
The retention time is calculated according to the period of the data-signal and the settling time.
The present invention also provides a kind of measuring devices, are applied to microphone, comprising:
Measuring unit, the delay of the clock signal for adjusting the microphone, measures the data-signal of the microphone
Sampled point effective range；
Acquiring unit, the foundation of the time margin for obtaining the data-signal according to the effective range of the sampled point
Time and retention time；
Adjustment unit, for adjusting the data according to the settling time of the time margin and the retention time
The target position of the sampled point of signal.
Preferably, the measuring unit is used to adjust the delay of the clock signal of the microphone, according to the microphone
The data signal edge measure the data-signal sampled point effective range.
Preferably, the effective range of the sampled point are as follows: the position of the valid window of the sampled point of the data-signal.
Preferably, the acquiring unit is used for the effective range of the sampled point according to the data-signal, builds described in calculating
Between immediately；The retention time is calculated according to the period of the data-signal and the settling time.
Above-mentioned technical proposal the utility model has the advantages that
In the technical program, by adjusting the delay of microphone clock signal, adopting for actual microphone data-signal is measured
The effective range of sampling point；According to the settling time of the time margin of the actually active range computation data-signal of sampled point and holding
Time ensure that the accuracy of measurement；To adjust adopting for data-signal according to the settling time of time margin and retention time
The target position of sampling point, to guarantee the stability of data signal transmission.
Detailed description of the invention
Fig. 1 is a kind of flow chart of embodiment of measurement method of the present invention；
Fig. 2 is a kind of timing diagram of embodiment of measurement method of the present invention；
Fig. 3 is a kind of module map of embodiment of measuring device of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art without creative labor it is obtained it is all its
His embodiment, shall fall within the protection scope of the present invention.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the present invention can phase
Mutually combination.
The present invention will be further explained below with reference to the attached drawings and specific examples, but not as the limitation of the invention.
As shown in Figure 1, the present invention provides a kind of measurement method, it is applied to microphone, the measurement method includes following steps
It is rapid:
S1. the delay for adjusting the clock signal of the microphone measures the sampled point of the data-signal of the microphone
The effective range of (sample point)；
S2. settling time and the holding of the time margin of the data-signal are obtained according to the effective range of the sampled point
Time；
S3. the sampling of the data-signal is adjusted according to the settling time of the time margin and the retention time
The target position of point.
In the present embodiment, by adjusting the delay of microphone clock signal, adopting for actual microphone data-signal is measured
The effective range of sampling point；According to the settling time of the time margin of the actually active range computation data-signal of sampled point and holding
Time ensure that the accuracy of measurement；To adjust adopting for data-signal according to the settling time of time margin and retention time
The target position of sampling point, to guarantee the stability of data signal transmission.
In a preferred embodiment, the delay of the clock signal of the adjustment microphone, measures the microphone
The effective range of the sampled point of data-signal, comprising:
The delay for adjusting the clock signal of the microphone measures institute according to the data signal edge of the microphone
State the effective range of the sampled point of data-signal.
Further, the effective range of the sampled point are as follows: the position of the valid window of the sampled point of the data-signal.
In the present embodiment, the rising edge that the data signal edge being mentioned to can be signal is also possible to failing edge, needs
It is set according to actual conditions.
In practical application, can be measured in step sl by the adjustment PDM microphone samples point delay value of stepping one by one
The effective range of the sampled point of actual microphone data-signal.
In a preferred embodiment, the effective range according to the sampled point obtains more than the time of the data-signal
The settling time and retention time of amount, comprising:
According to the effective range of the sampled point of the data-signal, the settling time is calculated；
The retention time is calculated according to the period of the data-signal and the settling time.
In the present embodiment, settling time be equal to sampled point effective range multiplied by single sampled point step (step) when
Between；Retention time is equal to the period of data-signal and the difference of settling time.
For example and without limitation, with reference to Fig. 2 by taking measured result (following table) in G12B platform W400 public affairs version as an example, effective window
Mouth is 4~18, and traditional mode defaults sample point default value " 18 ", knows that sample point's is effective after tested
Window is 4-18.
Internal system time clock is 133MHz, and each sample point step (step) is equal to 1 clock cycle (clock
Period), i.e. 7.5ns.The clock signal (PDM_DCLK) of microphone is 3.072MHz, and each data-signal (PDM_DATA) is
Half of clock cycle, i.e. 163ns.
The valid window of sample point is 4-18 (i.e. totally 14 step), i.e. tSETUP=14 × 7.5=105ns；
THOLD=163-105=58ns.
With reference to Fig. 2, the internal latency (tDLY) of clock signal can be adequately considered using the present invention, by step by step
Adjusting sample point obtain actual valid window, when calculating actual settling time according to the valid window and keep
Between, sample point is arranged according to settling time and retention time, to guarantee the stability of microphone.
As shown in figure 3, being applied to microphone the present invention also provides a kind of measuring device, comprising: measuring unit 1 obtains
Unit 2 and adjustment unit 3, in which:
Measuring unit 1, the delay of the clock signal for adjusting the microphone, measures the data-signal of the microphone
Sampled point effective range；
Acquiring unit 2, the time margin for obtaining according to the effective range of the sampled point data-signal are built
Between immediately and the retention time；
Adjustment unit 3, for adjusting the number according to the settling time of the time margin and the retention time
It is believed that number sampled point target position.
In the present embodiment, by adjusting the delay of microphone clock signal, adopting for actual microphone data-signal is measured
The effective range of sampling point；According to the settling time of the time margin of the actually active range computation data-signal of sampled point and holding
Time ensure that the accuracy of measurement；To adjust adopting for data-signal according to the settling time of time margin and retention time
The target position of sampling point, to guarantee the stability of data signal transmission.
In a preferred embodiment, the measuring unit 1 is used to adjust the delay of the clock signal of the microphone, according to
The data signal edge of the microphone measures the effective range of the sampled point of the data-signal.
Further, the effective range of the sampled point are as follows: the position of the valid window of the sampled point of the data-signal.
In a preferred embodiment, the acquiring unit 2 is used for the effective range of the sampled point according to the data-signal,
Calculate the settling time；The retention time is calculated according to the period of the data-signal and the settling time.
The present invention can not only accurately reflect the real system of PDM sampling inside SOC, the also Sample for PDM interface
Point value provides reference, easy to operate understandable The invention also achieves the procedure of test process, standardization.
It should be understood that the present disclosure additionally applies for NAND (computer flash memory device), eMMC (Embedded Multi
Media Card), SDIO (Secure Digital Input and Output, secure digital input-output card), DDR memory,
The signal testings such as MIPI (Mobile Industry Processor Interface, mobile industry processor interface).
The foregoing is merely preferred embodiments of the present invention, are not intended to limit embodiments of the present invention and protection model
It encloses, to those skilled in the art, should can appreciate that all with made by description of the invention and diagramatic content
Equivalent replacement and obviously change obtained scheme, should all be included within the scope of the present invention.
Claims (8)
1. a kind of measurement method is applied to microphone, which is characterized in that the measurement method includes the following steps:
The delay for adjusting the clock signal of the microphone measures effective model of the sampled point of the data-signal of the microphone
It encloses；
The settling time and retention time of the time margin of the data-signal are obtained according to the effective range of the sampled point；
The mesh of the sampled point of the data-signal is adjusted according to the settling time of the time margin and the retention time
Cursor position.
2. measurement method according to claim 1, it is characterised in that: the clock signal of the adjustment microphone is prolonged
Late, the effective range of the sampled point of the data-signal of the microphone is measured, comprising:
The delay for adjusting the clock signal of the microphone measures the number according to the data signal edge of the microphone
It is believed that number sampled point effective range.
3. measurement method according to claim 1, it is characterised in that: the effective range of the sampled point are as follows: the data
The position of the valid window of the sampled point of signal.
4. measurement method according to claim 1, it is characterised in that: described to be obtained according to the effective range of the sampled point
The settling time and retention time of the time margin of the data-signal, comprising:
According to the effective range of the sampled point of the data-signal, the settling time is calculated；
The retention time is calculated according to the period of the data-signal and the settling time.
5. a kind of measuring device is applied to microphone, which is characterized in that described to include:
Measuring unit, the delay of the clock signal for adjusting the microphone, measures adopting for the data-signal of the microphone
The effective range of sampling point；
Acquiring unit, the settling time of the time margin for obtaining the data-signal according to the effective range of the sampled point
And the retention time；
Adjustment unit, for adjusting the data-signal according to the settling time of the time margin and the retention time
Sampled point target position.
6. measuring device according to claim 5, it is characterised in that: the measuring unit is for adjusting the microphone
The delay of clock signal measures the effective of the sampled point of the data-signal according to the data signal edge of the microphone
Range.
7. measuring device according to claim 5, it is characterised in that: the effective range of the sampled point are as follows: the data
The position of the valid window of the sampled point of signal.
8. measuring device according to claim 5, it is characterised in that: the acquiring unit is used for according to the data-signal
Sampled point effective range, calculate the settling time；It is calculated according to the period of the data-signal and the settling time
The retention time.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910002290.6A CN109831208A (en) | 2019-01-02 | 2019-01-02 | Measurement method and device |
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| CN201910002290.6A CN109831208A (en) | 2019-01-02 | 2019-01-02 | Measurement method and device |
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Application publication date: 20190531 |