參數(shù)資料
型號(hào): AD1891
廠商: Analog Devices, Inc.
英文描述: SamplePort Stereo Asynchronous Sample Rate Converters
中文描述: SamplePort立體聲異步采樣速率轉(zhuǎn)換器
文件頁(yè)數(shù): 9/20頁(yè)
文件大小: 416K
代理商: AD1891
AD1890/AD1891
REV. 0
–9–
AMP
TIME
SUBFILTER COEFFICIENTS
ALIGNED TO THE LEFT
Tsin = 1/Fsin
FREQ
Fsin/2
Fsin/2
Fsin/2
Fsin/2
Fsin/2
PHASE
DELAY = NOMINAL
DELAY = NOMINAL
DELAY = NOMINAL – .25/Fsin
DELAY = NOMINAL – .5/Fsin
DELAY = NOMINAL – .75/Fsin
Figure 3. Four Polyphase Subfilters Realigned to Coarse Time Grid
POLYPHASE FILTER 1
POLYPHASE FILTER 2
POLYPHASE FILTER 3
POLYPHASE FILTER 4
POLYPHASE FILTER 5
POLYPHASE FILTER 6
POLYPHASE FILTER 7
INPUT
SIGNAL
POLYPHASE FILTER N-1
POLYPHASE FILTER N
SELECT
N TO 1
MUX
OUTPUT
SIGNAL
SAMPLE
CLOCK
TRACKING
CIRCUIT
PARALLEL POLYPHASE
FILTER BANK
Figure 4. Polyphase Filter Bank Model—Conceptual Block
Diagram
T he full set of subfilters can be considered to form a parallel
bank of “polyphase” filters which have decrementing, linear
phase group delays. All of the polyphase filters conceptually pro-
cess the input signal simultaneously, as illustrated in Figure 4, at
the input sample rate.
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