From c6acabb7df67983a3a4ebd4a34a7655a431bdeb7 Mon Sep 17 00:00:00 2001
From: Johnathan Corgan <johnathan@corganlabs.com>
Date: Tue, 30 Apr 2013 13:22:52 -0700
Subject: vocoder: moved include dir to gnuradio/vocoder
---
gr-vocoder/include/vocoder/cvsd_encode_sb.h | 131 ----------------------------
1 file changed, 131 deletions(-)
delete mode 100644 gr-vocoder/include/vocoder/cvsd_encode_sb.h
(limited to 'gr-vocoder/include/vocoder/cvsd_encode_sb.h')
diff --git a/gr-vocoder/include/vocoder/cvsd_encode_sb.h b/gr-vocoder/include/vocoder/cvsd_encode_sb.h
deleted file mode 100644
index 40f2eb2a6c..0000000000
--- a/gr-vocoder/include/vocoder/cvsd_encode_sb.h
+++ /dev/null
@@ -1,131 +0,0 @@
-/* -*- c++ -*- */
-/*
- * Copyright 2007,2013 Free Software Foundation, Inc.
- *
- * This file is part of GNU Radio
- *
- * GNU Radio is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 3, or (at your option)
- * any later version.
- *
- * GNU Radio is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with GNU Radio; see the file COPYING. If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street,
- * Boston, MA 02110-1301, USA.
- */
-#ifndef INCLUDED_VOCODER_CVSD_ENCODER_SB_H
-#define INCLUDED_VOCODER_CVSD_ENCODER_SB_H
-
-#include <vocoder/api.h>
-#include <gnuradio/sync_decimator.h>
-
-namespace gr {
- namespace vocoder {
-
- /*!
- * \brief This block performs CVSD audio encoding. Its design and
- * implementation is modeled after the CVSD encoder/decoder
- * specifications defined in the Bluetooth standard.
- * \ingroup audio_blk
- *
- * \details
- * CVSD is a method for encoding speech that seeks to reduce the
- * bandwidth required for digital voice transmission. CVSD takes
- * advantage of strong correlation between samples, quantizing the
- * difference in amplitude between two consecutive samples. This
- * difference requires fewer quantization levels as compared to
- * other methods that quantize the actual amplitude level,
- * reducing the bandwidth. CVSD employs a two level quantizer
- * (one bit) and an adaptive algorithm that allows for continuous
- * step size adjustment.
- *
- * The coder can represent low amplitude signals with accuracy
- * without sacrificing performance on large amplitude signals, a
- * trade off that occurs in some non-adaptive modulations.
- *
- * The CVSD encoder effectively provides 8-to-1 compression. More
- * specifically, each incoming audio sample is compared to an
- * internal reference value. If the input is greater or equal to
- * the reference, the encoder outputs a "1" bit. If the input is
- * less than the reference, the encoder outputs a "0" bit. The
- * reference value is then updated accordingly based on the
- * frequency of outputted "1" or "0" bits. By grouping 8 outputs
- * bits together, the encoder essentially produce one output byte
- * for every 8 input audio samples.
- *
- * This encoder requires that input audio samples are 2-byte short
- * signed integers. The result bandwidth conversion, therefore,
- * is 16 input bytes of raw audio data to 1 output byte of encoded
- * audio data.
- *
- * The CVSD encoder module must be prefixed by an up-converter to
- * over-sample the audio data prior to encoding. The Bluetooth
- * standard specifically calls for a 1-to-8 interpolating
- * up-converter. While this reduces the overall compression of
- * the codec, this is required so that the encoder can accurately
- * compute the slope between adjacent audio samples and correctly
- * update its internal reference value.
- *
- * References:
- *
- * 1. Continuously Variable Slope Delta Modulation (CVSD) A Tutorial,
- * Available: http://www.eetkorea.com/ARTICLES/2003AUG/A/2003AUG29_NTEK_RFD_AN02.PDF.
- *
- * 2. Specification of The Bluetooth System
- * Available: http://grouper.ieee.org/groups/802/15/Bluetooth/core_10_b.pdf.
- *
- * 3. McGarrity, S., Bluetooth Full Duplex Voice and Data Transmission. 2002.
- * Bluetooth Voice Simulink� Model, Available:
- * http://www.mathworks.com/company/newsletters/digest/nov01/bluetooth.html
- */
- class VOCODER_API cvsd_encode_sb : virtual public sync_decimator
- {
- public:
- // gr::vocoder::cvsd_encode_sb::sptr
- typedef boost::shared_ptr<cvsd_encode_sb> sptr;
-
- /*!
- * \brief Constructor parameters to initialize the CVSD encoder.
- * The default values are modeled after the Bluetooth standard and
- * should not be changed except by an advanced user
- *
- * \param min_step Minimum step size used to update the internal reference. Default: "10"
- * \param max_step Maximum step size used to update the internal reference. Default: "1280"
- * \param step_decay Decay factor applied to step size when there is not a run of J output 1s or 0s.
- * Default: "0.9990234375" (i.e. 1-1/1024)
- * \param accum_decay Decay factor applied to the internal reference during every interation of the codec.
- * Default: "0.96875" (i.e. 1-1/32)
- * \param K; Size of shift register; the number of output bits remembered by codec (must be <= to 32).
- * Default: "32"
- * \param J; Number of bits in the shift register that are equal; i.e. the size of a run of 1s, 0s.
- * Default: "4"
- * \param pos_accum_max Maximum integer value allowed for the internal reference.
- * Default: "32767" (2^15 - 1 or MAXSHORT)
- * \param neg_accum_max Minimum integer value allowed for the internal reference.
- * Default: "-32767" (-2^15 + 1 or MINSHORT+1)
- */
- static sptr make(short min_step=10, short max_step=1280,
- double step_decay=0.9990234375, double accum_decay= 0.96875,
- int K=32, int J=4,
- short pos_accum_max=32767, short neg_accum_max=-32767);
-
- virtual short min_step() = 0;
- virtual short max_step() = 0;
- virtual double step_decay() = 0;
- virtual double accum_decay() = 0;
- virtual int K() = 0;
- virtual int J() = 0;
- virtual short pos_accum_max() = 0;
- virtual short neg_accum_max() = 0;
- };
-
- } /* namespace vocoder */
-} /* namespace gr */
-
-#endif /* INCLUDED_VOCODER_CVSD_ENCODE_SB_H */
--
cgit v1.2.3