Decoder for decoding and encoded digital signal and a receiver comprising the decoder
DC CAFC- US 5,777,992 A
- Filed: 06/07/1995
- Issued: 07/07/1998
- Est. Priority Date: 06/02/1989
- Status: Expired due to Term
First Claim
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1. A decoder for decoding an encoded digital signal, wherein the encoded digital signal represents a wideband digital signal having a sampling frequency Fs, and the encoded digital signal comprises consecutive frames, each frame comprising a plurality of information packets, each information packet comprising N bits, N being larger than 1, a frame comprising at least a first frame portion including synchronization information;
- and wherein the decoder comprises;
an input for receiving the encoded digital signal, means for converting the encoded digital signal into a replica of the wideband digital signal, andan output for supplying the replica of the wideband digital signal,characterized in that said converter is arranged for converting a signal having a number of information packets in one frame determined according to the formula ##EQU4## where BR is the bitrate of the encoded digital signal and ns is the number of samples of the wideband digital signal whose corresponding information in the encoded digital signal is included in one frame of the encoded digital signal, andif P is an integer, the number of information packets in one frame is P, andif P is not an integer, the number of information packets in a number v of the frames is P'"'"', where P'"'"' is the highest integer whose value is less than P; and
the number of information packets in a number w of the other frames is equal to P'"'"'+1, the numbers v and w being selected such that the average frame rate of the encoded digital signal is substantially equal to Fs /ns.
2 Assignments
Litigations
1 Petition
Reexamination
Accused Products
Abstract
An encoded digital signal having frames of different lengths is decoded to obtain a wideband digital signal. The decoder converts frames having information packets, where the number of packets in a frame is related to the sampling frequency of the wideband digital signal, the bitrate of the encoded digital signal, the number of bits in the information packets, and the number of samples of the wideband digital signal whose corresponding information is the encoded digital signal in the frame. A receiver for such a signal includes a decoder for converting the frames.
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Citations
21 Claims
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1. A decoder for decoding an encoded digital signal, wherein the encoded digital signal represents a wideband digital signal having a sampling frequency Fs, and the encoded digital signal comprises consecutive frames, each frame comprising a plurality of information packets, each information packet comprising N bits, N being larger than 1, a frame comprising at least a first frame portion including synchronization information;
- and wherein the decoder comprises;
an input for receiving the encoded digital signal, means for converting the encoded digital signal into a replica of the wideband digital signal, and an output for supplying the replica of the wideband digital signal, characterized in that said converter is arranged for converting a signal having a number of information packets in one frame determined according to the formula ##EQU4## where BR is the bitrate of the encoded digital signal and ns is the number of samples of the wideband digital signal whose corresponding information in the encoded digital signal is included in one frame of the encoded digital signal, and if P is an integer, the number of information packets in one frame is P, and if P is not an integer, the number of information packets in a number v of the frames is P'"'"', where P'"'"' is the highest integer whose value is less than P; and
the number of information packets in a number w of the other frames is equal to P'"'"'+1, the numbers v and w being selected such that the average frame rate of the encoded digital signal is substantially equal to Fs /ns. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
- and wherein the decoder comprises;
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19. A receiver for receiving an encoded digital signal and for converting the encoded digital signal into a wideband digital signal, comprising a decoder for decoding the encoded digital signal,
wherein the encoded digital signal represents a wideband digital signal having a sampling frequency Fs, and the encoded digital signal comprises consecutive frames, each frame comprising a plurality of information packets, each information packet comprising N bits, N being larger than 1, a frame comprising at least a first frame portion including synchronization information, and wherein the decoder comprises: -
an input for receiving the encoded digital signal, means for converting the encoded digital signal into a replica of the wideband digital signal, and an output for supplying the replica of the wideband digital signal, characterized in that said converter is arranged for converting a signal having a number of information packets in one frame determined according to the formula ##EQU5## where BR is the bitrate of the encoded digital signal and ns is the number of samples of the wideband digital signal whose corresponding information in the encoded digital signal is included in one frame of the encoded digital signal, and if P is an integer, the number of information packets in one frame is P, and if P is not an integer, the number of information packets in a number v of the frames is P'"'"', where P'"'"' is the highest integer whose value is less than P; and
the number of information packets in a number w of the other frames is equal to P'"'"'+1, the numbers v and w being selected such that the average frame rate of the encoded digital signal is substantially equal to Fs /ns. - View Dependent Claims (20, 21)
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Specification
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Litigation Data
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Current AssigneeTDF SAS (Fluor Corporation), Institut Fur Rundfunktechnik GmbH, US Philips Corporation (Koninklijke Philips N.V.), Telediffusion De France SA
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Original AssigneeUS Philips Corporation (Koninklijke Philips N.V.)
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InventorsLokhoff, Gerardus C. P.
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Primary Examiner(s)Olms, Douglas W.
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Assistant Examiner(s)HOM, SHICK C
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Application NumberUS08/488,322
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Time in Patent Office1,126 Days
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Field of Search370/460, 370/470, 370/471, 370/473, 370/480, 370/468, 375/241, 375/242, 375/200, 375/343, 375/350
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US Class Current370/389
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CPC Class CodesG10L 19/008 Multichannel audio signal c...G10L 19/0208 Subband vocodersG11B 20/00007 Time or data compression or...G11B 20/00086 Circuits for prevention of ...G11B 20/00992 Circuits for stereophonic o...G11B 20/10 Digital recording or reprod...G11B 20/10527 Audio or video recording; D...G11B 20/12 Formatting, e.g. arrangemen...G11B 20/1833 by adding special lists or ...G11B 2020/10592 specifically adapted for re...G11B 2020/10601 surround sound signalG11B 2220/90 Tape-like record carriersG11B 2220/913 Digital audio tape [DAT] fo...G11B 2220/93 Longitudinal format, wherei...G11B 27/3027 used signal is digitally codedH04B 1/665 using psychoacoustic proper...H04B 1/667 using a division in frequen...H04H 20/28 Arrangements for simultaneo...H04H 20/30 by a single channelH04H 20/31 using in-band signals, e.g....View All
