Data multiplexing and separation method

• US 5,228,033 A
• Filed: 09/30/1991
• Issued: 07/13/1993
• Est. Priority Date: 10/05/1990
• Status: Expired due to Fees

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Okouchi, Fusakichi
• Primary Examiner(s): Olms, Douglas W.
• Assistant Examiner(s): HSU, ALPUS
• Application Number:
  US07/767,379
• Time in Patent Office: 652 Days
• Field of Search: 370/7, 370/125, 370/77, 370/82, 370/83, 370/84, 370/94.1, 370/94.2, 370/95.1, 370/99, 370/100.1, 370/105.1, 370/105.2, 370/109, 370/110.1, 370/110.4, 370/111 , 370/112, 370/118, 358/133, 358/141, 358/142, 358/143, 358/148, 381/29, 381/31, 381/34, 382/41, 382/56
• US Class Current: 370/538
• CPC Class Codes: H04J 3/1647 Subrate or multislot multiplexing
• CPC Class Codes: H04Q 11/0471 Terminal access circuits
• CPC Class Codes: H04Q 2213/214 Phase shifted impulses; Clock signals; Timing
• CPC Class Codes: H04Q 2213/216 Code signals; Framing (not synchronizing)
• CPC Class Codes: H04Q 2213/292 Time (de)multiplexing
• CPC Class Codes: H04Q 2213/36 Synchronisation

Abstract

The invention is a data multiplexing and separation method. It takes a plural number of timing data from memory that stores the plural number of timing data so as to detect bit positions on frame data signals on which bits respectively affiliated with a plural number of data are arranged. The plural number of timing data is used as the basis to arrange data to the frame data signal by successively arranging bits respectively affiliated with the plural number of data to the frame data signal so that the plural number of data is multiplexed to the frame data signals. And also it extracts a plural number of data from frame data signals by successively taking bits respectively affiliated with multiplexed the plural number of data from the frame data signals on the basis of the plural number of timing signals, and extracts a plural number of the multiplexed data from the frame data signals.

Claims

1. A data multiplexing method including:

a timing data taking step that takes a plural number of timing data from a timing data storage means that stores said plural number of timing data, said plural number of timing data being thus used to determine bit positions of the bits for a plurality of transmission signal data respectively, said bit positions being positions in frame data signals at which the bits for said plurality of transmission signal data are arranged, said frame data signals being cyclic signals and having a predetermined number of bits for each cycle thereof, and

a data arrangement step that uses said timing data as the basis for arranging said plural number of transmission data on said frame data signals by successively arranging the bits for said plural number of transmission data on said frame data signals;

wherein, with regard to transmission signal data, other than voice data, of said plural number of transmission signal data, said data arrangement step is a step that uses said plural number of timing data as the basis for producing data clock pulses from reference clock pulses by masking appropriate reference clock pulses of said reference clock pulses, said reference clock pulses occurring in sync with said frame data signals, and said data arrangement step then successively arranging the bits for said plural number of transmission signal data on said frame data signals at the bit positions of the bits for said plural number of transmission signal data, said bit positions corresponding to said data clock pulses; and

with regard to said voice data of said plural number of transmission data, said data arrangement step uses the timing data, for said voice data, of said plural number of timing data so as to appropriately mask first bit positions in the frame data signals, bits for said voice data being thus arranged on second bit positions on the frame data signals other than said first bit positions.

2. The data multiplexing method according to claim 1, wherein said plural number of timing data are set in accordance with respective data types and transmission speeds of said plural number of transmission signal data.

3. The data multiplexing method according to claim 1, wherein said timing data corresponding to said volume data is set in accordance with a transmission speed of said voice data.

4. The data multiplexing method according to claim 1, wherein said timing data taking step is a step that takes said plural number of timing data from said timing data storage means every frame of said frame data signals.

5. A data separation method including:

a timing data taking step that takes a plural number of timing data from a timing data storage means that stores said plural number of timing data, said plural number of timing data being thus used to determine bit positions of the bits for a plurality of received signal data respectively, said bit positions being positions in frame data signals at which the bits for said plurality of received signal data are arranged, said frame data signals being cyclic signals and having a predetermined number of bits for each cycle thereof, and

a data extracting step that uses said timing data as the basis for extracting said plural number of received data from said frame data signals by successively extracting the bits for said plural number of received data from said frame data signals;

wherein, with regard to receive signal data, other than voice data, of said plural number of received signal data, said data extracting step uses said plural number of timing data as the basis for producing data clock pulses from reference clock pulses by masking appropriate reference clock pulses of said reference clock pulses, said reference clock pulses occurring in sync with said frame data signals, and said data extracting step then successively extracting the bits for said plural number of received signal data on said frame data signals from the bit positions of the bits for said plural number of received signal data, said bit positions corresponding to said data clock pulses; and

with regard to said voice data of said plural number of received signal data, said data extracting step uses the timing data, for said voice data, of said plural number of timing data so as to appropriately mask first bit positions in the frame data signal, bits for said voice data being thus extracted from second bit positions on the frame data signals other than said first bit positions.

6. The data separation method according to claim 5, wherein said plural number of timing data are set in accordance with respective data types and transmission speeds of said plural number of received signal data.

7. The data separation method according to claim 5, wherein said timing data corresponding to said voice data is set in accordance with a transmission speed of said voice data.

8. The data separation method according to claim 5, wherein said timing data taking step is a step that takes said plural number of timing data from said timing data storage means every frame of said frame data signals.

9. A data multiplexing and separation method, characterized in:

taking a plural number of timing data from a timing data storage means that stores said plural number of timing data, said plural number of timing data being thus used for determining bit positions of bits for a plural number of transmission data, said bit positions being positions in frame data signals at which the bits for said plurality of transmission signal data are arranged, said frame data signals being cyclic signals and having a predetermined number of bits for each cycle;

using said plural number of timing data as the basis for producing data clock pulses from reference clock pulses by masking appropriate reference clock pulses of said reference clock pulses, said reference clock pulses occurring in sync with said frame data signals, then successively arranging the bits for said plural number of transmission signal data on said frame data signals on the bit positions of the bits for said plural number of transmission signal data, said bit positions corresponding to said data clock pulses;

taking said plural number of timing data from said timing data storage means; and

extracting a plural number of received signal data from the frame data signals by successively extracting bits for a plural number of received signal data, on the basis of said plural number of timing data.

10. A data multiplexing and separation method including:

a receive signal processing step that is supplied with a plural number of channels of frame data signals, which have been multiplexed with a plural number of data having a required number of bits for each cycle of said frame data signals, said frame data signals being cyclic signals, said frame data signal including a frame alignment signal for synchronization between said plural number of channels, and said receive signal processing step then separating said frame data signals into said plural number of channels, and respectively separating and thus extracting a plural number of reference clock pulses and a plural number of octet clock pulses, said plural number of reference clock pulses corresponding to the bits of said frame data signals respectively, and said plural number of octet clock pulses corresponding to octets of bits of said frame data signals;

a sync detect step that detects sync of said frame data signals by being in sync with said plurality of octet clock pulses, and said sync detect step verifying establishing of the sync of said frame data signals between said plural number of channels;

an inter-channel sync step that inputs said plural number of octet pulses, said plural number of reference clock pulses and said plural number of frame data signals, said inter-channel sync step thus reading frame alignment signals in sync with said plural number of references clock pulses and said plural number of octet clock pulses, said inter-channel sync step thus determining the order of respective frames of said plural number of frame data signals, said inter-channel sync step thus forming a channel sync status where the orders of the corresponding frames in the frame data signals between said plural number of channels agree with each other;

a data separating step that takes for every frame, and in accordance with an address in a timing data storage means specified by a CPU, a plural number of timing data from said timing data storage means that stores said plural number of timing data said plural number of timing data being thus used for determining bit positions of bits for a plurality of received signal data, said data separating step then separating and thus extracting sid plural number of received signal data an the basic of saidplural number of timing data;

a data multiplexing step that takes for every frame, said plural number of timing data from said timing data storage means in accordance with said address in said timing data storage means specified by said CPU, said data multiplexing step then multiplexing a plural number of transmission signal data on the basis of said plural number of timing data, on the plural number of channels of the frame data signals; and

a transmission signal processing step that combines said multiplexed plural number of channels of said frame data signals.

11. The data multiplexing and separation method according to claim 10, wherein:

said plural number of received signal data includes at least voice data, and

for received signal data other than said voice data, said data separation step takes the timing data corresponding to a transmission speed and a data type of said received data other than the voice data from said timing data storage means, then appropriate clock pulses of said plural number of reference clock pulses are masked on the basis of said timing data, then said received signal data other than said voice data is extracted from said frame data signals in accordance with the reference clock pulses which have not been masked; and

for said voice data, said data separating step takes timing data corresponding to a transmission speed of said voice data from said timing data storage means, said data separating step then determining bit positions at which a bit affiliated with said voice data is arranged on said frame data signals on the basis of said timing data, said data separating step then extracting said voice data from said frame data signals in accordance with said timing data; and

for transmission signal data other than said voice data, said data multiplexing step takes timing data corresponding to data type and a data transmission speed of said transmission signal data other than said voice data from said timing data storage means, said data multiplexing step then masking an appropriate reference clock pulse of said plural number of reference clock pulses on the basis of said timing data, said data multiplexing step then multiplexing said transmission signal data other than said voice data on the frame data signals by arranging bits affiliated with said transmission signal data other than said voice data; and

for said voice data, said data multiplexing step takes timing data corresponding to a transmission speed of said voice data from said timing data storage means, said data multiplexing step then using said timing data as the basis for determining bit positions at which bits affiliated with said voice data are arranged on said frame data signals, said data multiplexing step than multiplexing said voice data on said frame data signals by arranging bits affiliated with said voice data in accordance with the judged bit positions.

12. The data multiplexing and separation method according to claim 10, wherein

said data separating step and said data multiplexing step with respect respectively to said plural number of transmission data and said plural number of received data are performed in parallel and, said data separation steps and said data multiplexing steps with respect respectively to said plural number of data generate a plural number of input request signals respectively in order to read said plural number of timing data, corresponding respectively to said plural number of transmission signal data and said plural number of received signal data, from said timing data storage means;

said data separating steps and said data multiplexing steps thus successively generate a plural number of acknowledge signals to read said plural number of timing data corresponding to said plural number of transmission signal data and said plural number of received signal data respectively from said timing data storage means in accordance with a predetermined order with respect to said plural number of input request signals;

said data separating step and said data multiplexing step thus successively respectively generate a plural number of address signals to read said plural number of timing data from said timing data storage means in accordance with the respective generation of said plural number of acknowledge signals; and

said timing data storage means that receives said plural number of address signals successively transmits said plural number of timing data with respect to said data separation step and said data multiplexing step respectively for said plural number of transmission signal data and said plural number of received signal data.