FreeCalypso > hg > fc-tourmaline
view src/cs/layer1/gtt_include/ctm/tonemod.h @ 7:d6f8d6efdf5b
scripts/config-headers.sh: import from Magnetite
author | Mychaela Falconia <falcon@freecalypso.org> |
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date | Fri, 16 Oct 2020 06:52:37 +0000 |
parents | 4e78acac3d88 |
children |
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/* ******************************************************************************* * * COPYRIGHT (C) 2000 BY ERICSSON EUROLAB DEUTSCHLAND GmbH * 90411 NUERNBERG, GERMANY, Tel Int + 49 911 5217 100 * * The program(s) may be used and/or copied only with the * written permission from Ericsson or in accordance * with the terms and conditions stipulated in the agreement or * contract under which the program(s) have been supplied. * * Changes since October 13, 2000: * - The type mod_state_t includes a new member txbits_fifo_state now. * ******************************************************************************* * * File : tonemod.h * Purpose : header file for tonemod.c * ******************************************************************************* */ #ifndef tonemod_h #define tonemod_h "$Id: $" /* ******************************************************************************* * INCLUDE FILES ******************************************************************************* */ #include <fifo.h> /* ******************************************************************************* * DECLARATION OF PROTOTYPES ******************************************************************************* */ /* Define a type for the state variable of the function tonemod() */ typedef struct { WORD16 cntModulatedSamples; WORD16 actualBits[2]; fifo_state_t txbits_fifo_state; } mod_state_t; /* ---------------------------------------------------------------------- */ /* Function init_tonemod() */ /* *********************** */ /* This function has to be executed before tonemod() can be used. */ /* ---------------------------------------------------------------------- */ void init_tonemod(mod_state_t *mod_state); /* ---------------------------------------------------------------------- */ /* Function tonemod() */ /* ****************** */ /* Modulator of the Cellular Text Telephone Modem. */ /* The input vector bits_in must contain the bits that have to be */ /* transmitted. The length of bits_in must be even because always two */ /* bits are coded in parallel. */ /* Bits are either unipolar (i.e. {0, 1}) or bipolar (i.e. {-1, +1)}. */ /* The length of the output vector tones_out must be 20 times longer than */ /* the length of bits_in, since each pair of two bits is coded within a */ /* frame of 40 audio samples. */ /* ---------------------------------------------------------------------- */ void tonemod(WORD16 *tones_out, WORD16 *bits_in, WORD16 num_samples_tones_out, WORD16 num_bits_in, mod_state_t *mod_state); #endif