Pulse or digital communications – Pulse code modulation
Patent
1995-10-20
1997-08-26
Chin, Stephen
Pulse or digital communications
Pulse code modulation
375240, 375245, 392 238, H04B 1404, H04B 1406, H04B 166
Patent
active
056617550
ABSTRACT:
An encoder apparatus is disclosed for encoding a wideband digital information signal. The apparatus comprises an input signal (1) for receiving the wideband digital information signal, a signal splitting unit (2) for splitting the wideband digital information signal into M narrow band sub signals (SB.sub.1 to SB.sub.M). The narrow bands all have a specific constant bandwidth. Further, a scale factor determining unit (6) for determining a scale factor for subsequent signal blocks in each of the sub signals, and a quantization unit (13) for quantizing the samples in a signal block into quantized samples are present. A bit allocation information deriving unit (34,41,48) is present for deriving bit allocation information, the bit allocation information being representative of the number of bits with which samples in a signal block of a sub signal will be represented after quantization in the quantization unit (13). A formatting unit (20) is present for combining the quantized samples in the signal blocks of the quantized sub signals and the scale factors into a digital output signal having a format suitable for transmission or storage. The apparatus further comprises a signal block length determining unit (30) for determining the lengths of the signal block in at least one of the sub signals and for generating block length information, the block length information being representative of the said lengths of the signal blocks of the said at least one sub signal, where the lengths of subsequent signal blocks in said at least one sub signal differ. The scale factor determining unit (6) now determines the scale factors for subsequent signal blocks of varying lengths in response to said block length information, the bit allocation information deriving unit (34,41,48) now derives bit allocation information for subsequent signal blocks of varying lengths in response to said block length information, and the quantization unit (13) now quantize the samples in signal blocks of varying lengths in response to said block length information. The formatting unit (20) further includes the block length information into the digital output signal for transmission or storage.
REFERENCES:
patent: 5214678 (1993-05-01), Rault et al.
patent: 5260980 (1993-11-01), Akagiri et al.
patent: 5323396 (1994-06-01), Lokhoff
patent: 5365553 (1994-11-01), Veldhuis et al.
patent: 5367608 (1994-11-01), Veldhuis et al.
Oomen Arnoldus W. J.
Van De Kerkhof Leon M.
Chin Stephen
Phan Hai H.
U. S. Philips Corporation
Weiss Richard A.
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