EP0080712A2
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EP
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Sampling frequency converting apparatus
Assignee: NEC Corp
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Filing: 1982-11-26
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Granted: —
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Expires: 2002-11-26
Abstract
Abstract A sampling frequency converting apparatus converts an input digital digital signal which is sampled by a first frequency to an output digital signal, which is sampled by a second frequency. The apparatus comprises a memory, a write-address producer which operates in response to the first freqency, a read-address producer which operates in response to the second frequency, and an interpolation circuit. The speed of the converting operation is determined by the high frequency between the first and second frequencies.
Inventors
- 👤 Hiroshi C/O Nec Corporation Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 09:10
CPC Classifications
H; H03; H03H; H03H17/00; H03H17/02; H03H17/06; H03H17/0621; H03H17/0635; H03H17/0685; H04; H04B; H04B1/00; H04B1/66; H04B1/662; H04N; H04N7/00; H04N7/01; H04N7/0102; H04N9/00; H04N9/64
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
57 words
A sampling frequency converting apparatus comprising: means for storing a digital signal sampled by a first frequency into a memory in response to the timing of the first frequency; means for reading the digital from said memory in response to the timing of a second frequency; and means for interpolating the read digital signal from said memory.
Claim 2
Dependent Claim
57 words
A sampling frequency converting apparatus comprising: means for storing a digital signal sampled by a first frequency into a memory in response to the timing of the first frequency; means for reading the digital from said memory in response to the timing of a second frequency; and means for interpolating the read digital signal from said memory.
Claim 3
Dependent Claim
122 words
A sampling frequency converting apparatus for converting an input digital signal sampled by a first frequency f A to an output digital digital signal sampled by a second frequency f B , the relationship between f A and f B being = (M, N : integer), said apparatus comprising: memory means; means responsive to the first frequency f A for producing a write-address to store the input digital signal into said memory means, value of said write-address being changed by M; means responsive to the second frequency f B for producing a read-address to read the stored digital signal from said memory means, value of said read-address being changed by M; means for interpolating the read digital signal from said memory means.
Claim 4
Dependent Claim
122 words
A sampling frequency converting apparatus for converting an input digital signal sampled by a first frequency f A to an output digital digital signal sampled by a second frequency f B , the relationship between f A and f B being = (M, N : integer), said apparatus comprising: memory means; means responsive to the first frequency f A for producing a write-address to store the input digital signal into said memory means, value of said write-address being changed by M; means responsive to the second frequency f B for producing a read-address to read the stored digital signal from said memory means, value of said read-address being changed by M; means for interpolating the read digital signal from said memory means.
Claim 5
Dependent Claim
128 words
A sampling frequency converting apparatus for converting an input digital signal sampled by a first frequency f A to an output digital signal sampled by a second frequency f B , the relationship between f A and f B being = (M,N: integer), said apparatus comprising: memory means; means responsive to the first frequency f A for producing a write-address by increasing a value by "1" to store the input digital signal into said memory means; means responsive to the second frequency f B for producing a read-address by increasing a value by to read the stored digital signal from said memory means, the integer portion of the increased value being used as the said read-address; and means for interpolating the read digital signal from said memory means.
Claim 6
Dependent Claim
128 words
A sampling frequency converting apparatus for converting an input digital signal sampled by a first frequency f A to an output digital signal sampled by a second frequency f B , the relationship between f A and f B being = (M,N: integer), said apparatus comprising: memory means; means responsive to the first frequency f A for producing a write-address by increasing a value by "1" to store the input digital signal into said memory means; means responsive to the second frequency f B for producing a read-address by increasing a value by to read the stored digital signal from said memory means, the integer portion of the increased value being used as the said read-address; and means for interpolating the read digital signal from said memory means.
References Cited (Backward Citations)
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