Pulse or digital communications – Transmitters
Patent
1996-12-17
1999-08-03
Chin, Stephen
Pulse or digital communications
Transmitters
375372, 375240, 348205, H04L 2704
Patent
active
059334568
ABSTRACT:
A transmitter provided with a subband coder is disclosed. The transmitter receives a wideband digital information at an input 1 and provides an output signal for transmission at an output (30). The input signal may have a varying sampling frequency (f.sub.g). The bitrate of the output signal is substantially constant. In order to compensate for the varying sampling frequency of the input signal, the transmitter is provided with a buffer memory (8) and a detector (18) for determining the filling degree of the memory (8). The control signal so derived, which is representative of the filing degree, is supplied to the bitallocation information generation unit (10). The bitpool B is varied in response to the control signal so as to control the filling degree to a nominal value, such as half full (FIG. 1). Further a receiver is disclosed for receiving the transmitted wideband digital information signal.
REFERENCES:
patent: 5214507 (1993-05-01), Aravind et al.
patent: 5289507 (1994-02-01), Upp
patent: 5333012 (1994-07-01), Signghal et al.
patent: 5339338 (1994-08-01), Elliott
patent: 5440596 (1995-08-01), Kneepkens et al.
Groenewegen Marc E.
Oomen Arnoldus W. J.
Van Der Waal Robbert G.
Biren Steven R.
Chin Stephen
Liu Shuwany
U.S. Philips Corporation
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