help on AAC papers on AES

Started by Ding, Ke in Audio Signal Processing14 years ago

Hi all I'm new member in this group and currently doing the AAC LC encoder. Since I am not a member of AES, could you share the following...

Hi all I'm new member in this group and currently doing the AAC LC encoder. Since I am not a member of AES, could you share the following papers with me if you have? Also I want to make clear the following conceptions on AAC: 1. Is there any difference between MPEG2 AAC LC and MPEG4 AAC LC besides the PNS tool? 2. Should MPEG4 AAC be backward compatible with the MPEG2 AAC? 3. I always h


help on AAC papers on AES

Started by Ding, Ke in Audio Signal Processing14 years ago

Hi all I\'m new member in this group and currently doing the AAC LC encoder. Since I am not a member of AES, could you share the following...

Hi all I\'m new member in this group and currently doing the AAC LC encoder. Since I am not a member of AES, could you share the following papers with me if you have? Also I want to make clear the following conceptions on AAC: 1. Is there any difference between MPEG2 AAC LC and MPEG4 AAC LC besides the PNS tool? 2. Should MPEG4 AAC be backward compatible with the MPEG2 AAC? 3. I always


MPEG 2/4 -AAC Decoder

Started by UDAY Ammanagi in Audio Signal Processing14 years ago

Hi friends, .. i ve just begun working on MPEG2-AAC Decoder and will be stepping into MPEG4-AAC Decoder later on. so if there is anyone...

Hi friends, .. i ve just begun working on MPEG2-AAC Decoder and will be stepping into MPEG4-AAC Decoder later on. so if there is anyone out there on a similair task - get in touch with me on my corporate id - u...@chipwerks.com ..looking forward for a fruitful professional association ..!!!! Regards, -UDAY


MPEG-4 AAC+ CODEC Reference Software.

Started by Ramya Desai in Audio Signal Processing16 years ago

Hai All, Is there any reference code for MPEG-4 AAC+ Encoder and decoder ?. I came to know that even ISO has not released any reference code...

Hai All, Is there any reference code for MPEG-4 AAC+ Encoder and decoder ?. I came to know that even ISO has not released any reference code for AAC+ (SBR). So is there any chance to get a reference code for AAC+ ???? Thanks in Advance, Regards, Ramya.


MPEG-2/4 AAC decoder!

Started by ajit gupta in Audio Signal Processing16 years ago 1 reply

Hello All, I need a favor. Can somebody tell me about the companies who are having MPEG-2/4 AAC decoder and among all of them who is having...

Hello All, I need a favor. Can somebody tell me about the companies who are having MPEG-2/4 AAC decoder and among all of them who is having the best decoder? If somebody has already worked on AAC, may he/she share his/her experience about its performance, complexity, memory requirment, cycle count, no of channels supported by it for different profiles and some other related stuff which I


help regarding aac lc encoder

Started by sudeep hegde in Audio Signal Processing15 years ago

Hi All, I have some doubts regarding quality issues in mpeg4 aac lc encoder. 1) does aac lc encoder gives tranparent quality at 96kbps or...

Hi All, I have some doubts regarding quality issues in mpeg4 aac lc encoder. 1) does aac lc encoder gives tranparent quality at 96kbps or less for an audio of 48kHz stereo. 2)if so? what is the NMR,ODG and other scores one can expect waiting for ur valuable reply Regards, sudeep


ADTS header format

Started by brightjo_2000 in Audio Signal Processing15 years ago

Hi All, I am new to AAC. While reading the MPEG4 AAC ADTS header bitstream, the header gives the aac frame length as 0x0820 bytes in...

Hi All, I am new to AAC. While reading the MPEG4 AAC ADTS header bitstream, the header gives the aac frame length as 0x0820 bytes in decoder, but the maximum allowed input buffer length is only 0x0600 bytes? Sometimes the header is giving the aac frame length as 0x1800 bytes or 0xc000 bits? Even If I am having a maximum frame size of 1024 words, then the value should be less tha


Regarding MPEG-4 HE-AAC conformance testing

Started by gvgrao_spl in Audio Signal Processing14 years ago

Hi All, I am presently working on MPEG-4 HE-AAC. I faced problem with _twi(Twiddle)series,while i am doing the conformance testing. The vector...

Hi All, I am presently working on MPEG-4 HE-AAC. I faced problem with _twi(Twiddle)series,while i am doing the conformance testing. The vector is showing that its of AAC MAIN profile.But my decoder supports only AAC LC profile. So,is it necessary to test my decoder with _twi vectors? And also which series of vectors are sufficient to test Sbr part. If any one knows about this please mail


aac doubt

Started by Abhishek Ballaney in Audio Signal Processing13 years ago 1 reply

dear all, am working on mpeg4 aac lc decoder. how many sections can be there inside a group? this would help me in defining the array...

dear all, am working on mpeg4 aac lc decoder. how many sections can be there inside a group? this would help me in defining the array sizes. regards, abhi /\ |_ |_ ' _ |_ __ | /--\|_)| ||_\ | ||-_ | <


help for Parametric audio decoder

Started by snehal joshi in Audio Signal Processing15 years ago 1 reply

Hi I know that we can decode HE-AAC streams using AACLC decoder only High freq generation will not be there. Similarly can we decode...

Hi I know that we can decode HE-AAC streams using AACLC decoder only High freq generation will not be there. Similarly can we decode Parametric stereo AAC stream using only HE-AAC Decoder? I just want to know this as my decoder do not have PS decoding functionality. Thanks Snehal


MPEG-2 AAC File format

Started by kinj...@gmail.com in Audio Signal Processing14 years ago

Hi everybody, I am working on MPEG-2 AAC Encoder. I want info regarding the file format for the MPEG-2 AAC file. If someone is having related...

Hi everybody, I am working on MPEG-2 AAC Encoder. I want info regarding the file format for the MPEG-2 AAC file. If someone is having related document, please send it to me. thank you. Have a nice day. Bye.


help needed regarding iso aac encoder

Started by sudeep_mpeg in Audio Signal Processing15 years ago

hi, i am developing aac iso encoder and have a little doubt 1)why the iso encoder uses libtsp.h libtsp.lib ect 2)is there any single...

hi, i am developing aac iso encoder and have a little doubt 1)why the iso encoder uses libtsp.h libtsp.lib ect 2)is there any single workspace available for aac lc encoder since iso have clubbed all oether waiting for ur reply sudeep


Regarding HE-AAC

Started by hari_bolneni in Audio Signal Processing14 years ago

Hi all, Can any one know about the insight knowledge about HE-AAC. How the low and high frequency compnents are related? If any one having the...

Hi all, Can any one know about the insight knowledge about HE-AAC. How the low and high frequency compnents are related? If any one having the documents regarding this please mail me. Bye, Hari


Fixed Point MPEG-4 AAC Implementation.

Started by Ramya Desai in Audio Signal Processing16 years ago

Hi all, I have some codes for MPEG-4 AAC implementation. But they are floating point implementations. Is there any fixed point code available...

Hi all, I have some codes for MPEG-4 AAC implementation. But they are floating point implementations. Is there any fixed point code available for MPEG-4 AAC for both encoder and decoder ?. If any of you have that code..plz forward to me. or send me the link to download. Regards, Ramya. __________________________________ Do you Yahoo!? Protect your identity with Yahoo! Mail AddressGua


AAC psychoacoustic model

Started by #ARIJIT BISWAS# in Audio Signal Processing12 years ago

Hi all! Does anyone know how to translate the AAC psychoacoustic model scale-factor= information to the masking...

Hi all! Does anyone know how to translate the AAC psychoacoustic model scale-factor= information to the masking curve? http://en.wikipedia.org/wiki/Masking_threshold In layman=C2=92s word: > From the AAC scale-factor thresholds and scale-factor band information, I w= ant to get the masking curve that is a function of frequency (Hz) and SPL (= dB). Any help would be GREAT! :-) Best R


AAC LD bitstreams

Started by Sameer Kibey in Audio Signal Processing16 years ago

hi all I am looking for AAC "Low delay" (AAC_LD object type) test bitstreams to test an AAC LD decoder. Can anyone please suggest some links...

hi all I am looking for AAC "Low delay" (AAC_LD object type) test bitstreams to test an AAC LD decoder. Can anyone please suggest some links where these bitstreams would be avilable? thanks Sameer. --- "To understand recursion you must first understand recursion."


Psychoacoustics in MPEG-4 AAC.

Started by Ramya Desai in Audio Signal Processing16 years ago 5 replies

Hi all, A good day to all. I want to know about psychoacoustic models in MPEG-4 AAC. If any of you know links to papers..please forward me....

Hi all, A good day to all. I want to know about psychoacoustic models in MPEG-4 AAC. If any of you know links to papers..please forward me. I will be thankful to you. Regards, Ramya.


MPEG-4 AAC LC Books

Started by ramya_desai in Audio Signal Processing16 years ago 1 reply

Hai all, I am new to this group. I have to work on MPEG-4 AAC LC coding. May I know what books are available on this topic (Preferably...

Hai all, I am new to this group. I have to work on MPEG-4 AAC LC coding. May I know what books are available on this topic (Preferably available in India). I will be thankful to you. Regards, RD


Mpeg 2 AAC fixed point code

Started by "vinayhaveri.desai" in Audio Signal Processing12 years ago

Hi friends Could anyone tell me where the Fixed point Mpeg2 AAC decoder c code is available. Thanks Vinay

Hi friends Could anyone tell me where the Fixed point Mpeg2 AAC decoder c code is available. Thanks Vinay


(question) mpeg2 AAC encoder..TNS implementation

Started by venkispl in Audio Signal Processing15 years ago

hi, This is my first mail to this group I am working on mpeg2 AAC encoder.. I need some help about implementation of Temporal noise shaping...

hi, This is my first mail to this group I am working on mpeg2 AAC encoder.. I need some help about implementation of Temporal noise shaping in that... I found many articles about it, but not finding the essence for implementing it. Can anyone give me its theory and information on how it works or else some good references.. I would be thankful to u if I find a reply. Wish you the su