Release Notes for

STM32 Audio Engine - Loudness Control Library

Portions Copyright © 2012 STMicroelectronics
Portions SPIRIT Audio Engine Copyright (c) 1995-2009, SPIRIT

Microcontrollers Division - Application Team

Overview

• STMicroelectronics STM32 Audio Engine is a set of software libraries allowing customers to build audio applications with high-quality and professional results.

• The STM32 Audio Engine - Loudness Control Library modifies signal before amplification in order to preserve perceptual signal loudness. Modification is performed by 2nd order low-pass shelving filter which parameters depended on chosen amplification gain. For more details refer to: Loudness Control User's Guide

• It contains the following libraries/object codes to be included in the application project:

º lib_loudness_cortex_m4.a: optimized for Cortex-M4 core.

º lib_loudness_cortex_m3.a: optimized for Cortex-M3 core.

Update History

V1.1.1 / 27-April-2012

Main Changes

• Update spiritLdCtrl.h file's header formatting.

V1.1.0 / 20-April-2012

Main Changes

• Loudness Control Library object codes renamed:

º lib_loudness_arm_v7e-m.a renamed to lib_loudness_cortex_m4.a.

º lib_loudness_arm_v7-m.a renamed to lib_loudness_cortex_m3.a.

V1.0.1 / 06-March-2012

Main Changes

• spiritLdCtrl.h: license disclaimer text update and add link to the License file on ST Internet.

V1.0.0 / 28-December-2011

Main Changes

• First official release.

License

Licensed under MCD-ST Image SW License Agreement V2, (the "License"). You may not use this file except in compliance with the License. You may obtain a copy of the License at:

http://www.st.com/software_license_agreement_image_v2

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

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For complete documentation on STM32 microcontrollers please visit http://www.st.com/stm32

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