GB1484910A - Pulse code modulation data transmission systems - Google Patents
Pulse code modulation data transmission systemsInfo
- Publication number
- GB1484910A GB1484910A GB52768/74A GB5276874A GB1484910A GB 1484910 A GB1484910 A GB 1484910A GB 52768/74 A GB52768/74 A GB 52768/74A GB 5276874 A GB5276874 A GB 5276874A GB 1484910 A GB1484910 A GB 1484910A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filters
- response
- phase
- frequency
- receiver
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
- H04L25/03114—Arrangements for removing intersymbol interference operating in the time domain non-adaptive, i.e. not adjustable, manually adjustable, or adjustable only during the reception of special signals
- H04L25/03133—Arrangements for removing intersymbol interference operating in the time domain non-adaptive, i.e. not adjustable, manually adjustable, or adjustable only during the reception of special signals with a non-recursive structure
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H15/00—Transversal filters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H17/00—Networks using digital techniques
- H03H17/02—Frequency selective networks
- H03H17/06—Non-recursive filters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/62—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/02—Details
- H04B3/04—Control of transmission; Equalising
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Mathematical Physics (AREA)
- Power Engineering (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
- Filters That Use Time-Delay Elements (AREA)
- Dc Digital Transmission (AREA)
Abstract
1484910 Data transmission SIEMENS AG 6 Dec 1974 [14 Dec 1973] 52768/74 Heading H4P In order to shape the transmitted signals in a PCM data transmission system such that signal to noise ratio is optimized transversal filters are provided at both the transmitter and receiver, which together provide attenuation/frequency and phase/frequency characteristics such that at the receiver a partial response signal of class IV is produced (i.e. amplitude frequency response is given by /H(jw)/ = 2/sin wT/; phase frequency response by arg(H(jw)) = #/2sign[sin wT], where T represents the pulse duration of the PCM pulses for frequencies below an upper cut off, while above this cut off the filters block the signals. The required attenuation/frequency characteristic is produced conjointly, e.g. equally between the filters, whereas the required phase/frequency characteristic is produced by only one of them. The filters at transmitter and receiver may respectively be as shown at SF, EF, Fig. 1. The filters incorporate delay elements V, weighting elements B and adders S to combine the delayed and weighted versions of the signal applied to each filter in accordance with the required response. The phase response is effected only in the transmitting filter SF, by means of the arrangement and sign of the weighting units. Simple low pass filters TP1 and TP2 ensure that high frequency signals outside the required band are not transmitted. In one particular embodiment, a tapped delay line with closed circuit termination is used as the transmitting filter (Fig. 2, not shown). This enables the weighting units to be doubly effective and provide an improved approximation to the required characteristic. At the receiver a tapped delay line with a buffer termination feeding a further weighting unit is used (Fig. 3, not shown), the buffer being highly ohmic to provide an in phase reflection which enables the weighting units connected to the taps to be doubly effective, and provides a pure attenuation response.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2362274A DE2362274C3 (en) | 1973-12-14 | 1973-12-14 | Message transmission system for pulse code modulation |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1484910A true GB1484910A (en) | 1977-09-08 |
Family
ID=5900800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB52768/74A Expired GB1484910A (en) | 1973-12-14 | 1974-12-06 | Pulse code modulation data transmission systems |
Country Status (10)
| Country | Link |
|---|---|
| JP (1) | JPS535489B2 (en) |
| AT (1) | AT347500B (en) |
| AU (1) | AU476428B2 (en) |
| BE (1) | BE823337A (en) |
| DE (1) | DE2362274C3 (en) |
| FR (1) | FR2254916B1 (en) |
| GB (1) | GB1484910A (en) |
| IT (1) | IT1027664B (en) |
| NL (1) | NL167560C (en) |
| SE (1) | SE408114B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5558612A (en) * | 1978-10-26 | 1980-05-01 | Kokusai Denshin Denwa Co Ltd <Kdd> | Delay circuit |
| DE3132012A1 (en) * | 1981-08-13 | 1983-03-03 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Arrangement for equalising amplitude and phase distortions on transmission paths for analog signals |
| DE3132011A1 (en) * | 1981-08-13 | 1983-03-03 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt | Arrangement for simultaneous transmission of data via a plurality of common-wave transmitters and for equalising amplitude and phase distortions affecting the data on modulation feeders |
| JPS6153839A (en) * | 1984-08-23 | 1986-03-17 | Sony Corp | Waveform shaping device |
-
1973
- 1973-12-14 DE DE2362274A patent/DE2362274C3/en not_active Expired
-
1974
- 1974-12-06 GB GB52768/74A patent/GB1484910A/en not_active Expired
- 1974-12-13 FR FR7441104A patent/FR2254916B1/fr not_active Expired
- 1974-12-13 AT AT998674A patent/AT347500B/en not_active IP Right Cessation
- 1974-12-13 SE SE7415690A patent/SE408114B/en unknown
- 1974-12-13 IT IT30530/74A patent/IT1027664B/en active
- 1974-12-13 AU AU76385/74A patent/AU476428B2/en not_active Expired
- 1974-12-13 BE BE151492A patent/BE823337A/en unknown
- 1974-12-14 JP JP14398674A patent/JPS535489B2/ja not_active Expired
- 1974-12-14 NL NL7416322.A patent/NL167560C/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| NL167560C (en) | 1981-12-16 |
| FR2254916B1 (en) | 1980-03-21 |
| JPS535489B2 (en) | 1978-02-28 |
| ATA998674A (en) | 1978-05-15 |
| SE7415690L (en) | 1975-06-16 |
| AT347500B (en) | 1978-12-27 |
| DE2362274A1 (en) | 1975-06-19 |
| FR2254916A1 (en) | 1975-07-11 |
| DE2362274B2 (en) | 1979-10-31 |
| SE408114B (en) | 1979-05-14 |
| IT1027664B (en) | 1978-12-20 |
| DE2362274C3 (en) | 1980-07-10 |
| AU476428B2 (en) | 1976-09-23 |
| BE823337A (en) | 1975-06-13 |
| NL7416322A (en) | 1975-06-17 |
| NL167560B (en) | 1981-07-16 |
| AU7638574A (en) | 1976-06-17 |
| JPS5094809A (en) | 1975-07-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |