[특허]Integrated PCM level control and conversion using a lookup table

Integrated PCM level control and conversion using a lookup table 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	H03M-007/42
출원번호	US-0918931 (1992-07-22)
발명자 / 주소	Kattemalalavadi Shrikanth S. (San Jose CA) Williams Charles S. T. (Palo Alto CA)
출원인 / 주소	Stratacom, Inc. (San Jose CA 02)
인용정보	피인용 횟수 : 88 인용 특허 : 0

초록 ▼

A method and apparatus for converting a signal by reading a first signal that is represented in a first format. The first signal is used as an index into a lookup table, the first table containing entries representing signals in a second format modified by a gain. The first table outputs a second si

대표청구항 ▼

An apparatus in a network node of a telecommunication system for (1) converting a first signal from a first pulse code modulation (PCM) encoding to a second PCM encoding and (2) modifying the first signal by a first value, wherein the first signal can be an incoming signal of the network node and an outgoing signal of the network node, wherein the apparatus comprises: (A) a configurable random access memory (CRAM) for (1) converting the first signal from the first PCM encoding to the second PCM encoding and (2) modifying the first signal by the first value, wherein the CRAM is reconfigurable and rewritable, wherein the CRAM receives the first signal in the first PCM encoding, wherein the CRAM outputs the first signal in the second PCM encoding with the first value, wherein the first and second PCM encodings each can be one of an A-Law encoding and a mm1) whether the first PCM encoding of the first signal is the A-Law encoding or the m2) whether the second PCM encoding of the first signal is the A-Law encoding or the m3) the first value that the first signal is to be modified, wherein the direction value of the first signal can be in a first state and a second state, wherein when the first signal is the incoming signal, the direction value of the first signal is in the first state, wherein when the first signal is the outgoing signal, the direction value of the first signal is in the second state, wherein the first signal in the first PCM encoding is applied to the CRAM with the channel identifier and the direction value of the first signal as an address to access the lookup table of the CRAM for the first signal in the second PCM encoding with the first value; (B) first buffering means coupled to the CRAM for buffering the first signal in the first PCM encoding before the first signal is applied to the CRAM for conversion, wherein the first buffering means receives the first signal in the first PCM encoding when the first signal is the incoming signal of the network node, wherein the first buffering means does not receive the direction value and the channel identifier of the first signal when the first buffering means receives the first signal, wherein the first buffering means does not receive the first signal when the first signal is the outgoing signal; (C) second buffering means coupled to the CRAM for buffering the first signal in the first PCM encoding before the first signal is applied to the CRAM for conversion, wherein the second buffering means receives the first signal in the first PCM encoding when the first signal is the outgoing signal of the network node, wherein the second buffering means does not receive the direction value and the channel identifier of the first signal when the second buffering means receives the first signal, wherein the second buffering means does not receive the first signal when the first signal is the incoming signal, wherein the directional value and the channel identifier of the first signal are directly applied to the CRAM without being stored in a memory before applied to the CRAM; (D) third buffering means coupled to the CRAM for receiving the first signal in the second PCM encoding with the first value from the CRAM, wherein the third buffering means receives the first signal in the second PCM encoding with the first value from the CRAM and supplies as an output of the apparatus the first signal in the second PCM encoding with the first value when the first signal is the incoming signal of the network node, wherein the third buffering means does not receive the first signal from the CRAM when the first signal is the outgoing signal of the network node; (E) fourth buffering means coupled to the CRAM for receiving the first signal in the second PCM encoding with the first value from the CRAM, wherein the third buffering means receives the first signal in the second PCM encoding with the first value from the CRAM and supplies as the output of the apparatus the first signal in the second PCM encoding with the first value when the first signal is the outgoing signal of the network node, wherein the third buffering means does not receive the first signal from the CRAM when the first signal is the incoming signal of the network node; (F) enabling means coupled to the first, second, third, and fourth buffering means for controlling the first, second, third, and fourth buffering means to selectively receive the first signal under control of the direction value of the first signal, wherein the enabling means receives the direction value of the first signal, wherein the enabling means enables the first and third buffering means to receive the first signal when the direction value of the first signal is in the first state, wherein the enabling means enables the second and fourth buffering means to receive the first signal when the direction value of the first signal is in the second state; and (G) configuring means coupled to the CRAM for configuring the CRAM such that the CRAM can be dynamically reconfigured to have a different lookup table.

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Integrated PCM level control and conversion using a lookup table 원문보기

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Integrated PCM level control and conversion using a lookup table 원문보기

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