Query: 13 bit PCM ?

Started by jay_coep in Speech Coding15 years ago 1 reply

Hello, Can anybody please help explaining why GSM speech codecs (atleast HR,AMR) prefer 13 bit uniform PCM encoding ? I...

Hello, Can anybody please help explaining why GSM speech codecs (atleast HR,AMR) prefer 13 bit uniform PCM encoding ? I mean what is so special about '13' (Anything to do with SNR for speech signal?) Thanks in anticipation. Regards, Jayd


About optimizing (fixed point) DSP : using multiply command or filter routins

Started by hossein200000 in Speech Coding14 years ago

Hello I am working on implimenting amr codec for the 3rd generation of mobile communications on a DSP platform, my code is very...

Hello I am working on implimenting amr codec for the 3rd generation of mobile communications on a DSP platform, my code is very long and when I run it by simulator for tms320c55x it taked 20 milion clicks to do one frame!! my first question is that which DSP do you recommend me to use for a code that takes for example 400K bytes.


Is there any fast fcb search algorithm for G.723.1

Started by lily_yangzhou in Speech Coding17 years ago

Dear All, I'm now doing a transcoder between the G.723.1 and Gsm AMR. as we all now the fixed codebook search algorithm in the...

Dear All, I'm now doing a transcoder between the G.723.1 and Gsm AMR. as we all now the fixed codebook search algorithm in the reference G.723.1 cost much MIPS. I wonder if there are any much efficient search algorithm exist! Your reply would be highly appreciated


Need information on BFI testing.

Started by Anonymous in Speech Coding17 years ago

Hello Intellectuals, Please share some information on BFI (bad frame indication) testing of narrowband AMR speech codec. I...

Hello Intellectuals, Please share some information on BFI (bad frame indication) testing of narrowband AMR speech codec. I need answer for the following questions. 1. How BFI test vectors are generated ? What are the criteria that go in generating these test vecto


line spectral frequencies

Started by auliasn in Speech Coding16 years ago

dear all i have some difficulties with some algorithms. could anyone explain to me about the LPC and LSF (line spectral ...

dear all i have some difficulties with some algorithms. could anyone explain to me about the LPC and LSF (line spectral frequencies) algorithms that are being used in AMR system? coz i've found out in the ETSI doc or 3GPP doc. not clear enough for me to understand it.


Need Info about Speech Codecs

Started by hibh...@gmail.com in Speech Coding14 years ago 1 reply

Hi, I work for a Multimedia startup company. we are luking for speech codecs implemented on ARM9 platform for our end system.Can any one...

Hi, I work for a Multimedia startup company. we are luking for speech codecs implemented on ARM9 platform for our end system.Can any one give some info abt good companies who does Porting of speech codecs. we need ITU G.723.1 or 3gpp AMR-NB and G.726, G.711. Also cud any tell me how much each codec will cost(in $)so that we can choose the one which fits our bud


AMR-WB Synchronization test sequence

Started by aram...@wipro.com in Speech Coding14 years ago

hi all, I have downloaded the amrwb v6.0.0 from 3gpp(26.173). i have downloaded the test sequences also(26.174). i have checked the DTX and T...

hi all, I have downloaded the amrwb v6.0.0 from 3gpp(26.173). i have downloaded the test sequences also(26.174). i have checked the DTX and T test in the test sequence. but i dont know how to check the bit and frame synchronisation tests. if any one run the tests please send the script file or give me the idea how to do the test. Thanks in advance. ARAM


Why high pass filtering and down scaling in pre processing

Started by subrata chatterjee in Speech Coding17 years ago 4 replies

hi friends, In AMR speech codec why do we need to use high pass filtering and down scaling in pre processing??? Again the...

hi friends, In AMR speech codec why do we need to use high pass filtering and down scaling in pre processing??? Again the technique of down scalling is not clear to me....So please anyone help me by answering the above queries in detail. Thanks in advance Sub


synchronisation test sequences for GSM speech codecs

Started by ksvd prasad in Speech Coding17 years ago 1 reply

Hi, I'm facing some problem when i'm ensuring bit/frame synchronisation test sequences for GSM speech codecs(HR/EFR/AMR) as...

Hi, I'm facing some problem when i'm ensuring bit/frame synchronisation test sequences for GSM speech codecs(HR/EFR/AMR) as specified by the standard. In the standard also they didn't specify how to test it? if any body works on this please clarify this point. By the way


Transcoder between G.729 & AMR & G.723.1

Started by gray_1024 in Speech Coding17 years ago

I'm now doing a transcoder between G.729 & G.723.1. Considering the conversion of pitch delay, since G.723.1 encodes speech...

I'm now doing a transcoder between G.729 & G.723.1. Considering the conversion of pitch delay, since G.723.1 encodes speech with 30ms frames, while G.729 with 20ms frames, how can i do? I attempt to convert the pitch delay using linear interpolation, but the perform


Request the information.

Started by HyungJung Kim in Speech Coding19 years ago

Hello all, I am very interesting in speech. The compexity and memory size AMR codec and draft SMV...

Hello all, I am very interesting in speech. The compexity and memory size AMR codec and draft SMV was released.  


NAMR test Vectors.

Started by Anonymous in Speech Coding17 years ago

Hi All, Narrow band AMR test vectors (26.074) are in two formats. 1. Bit Stream Format. 2. Parametric (No-Bit Stream) Format....

Hi All, Narrow band AMR test vectors (26.074) are in two formats. 1. Bit Stream Format. 2. Parametric (No-Bit Stream) Format. I have only test vectors for Bit Stream Format. I am in need of test formants in parametric format. Please do the needful.


Doubt_AMR

Started by rakesh chaudry in Speech Coding16 years ago 1 reply

Hi experts , I am working in speech coding , Now i am interested to go for . AMR Codec when i am downloading in the 3gpp site...

Hi experts , I am working in speech coding , Now i am interested to go for . AMR Codec when i am downloading in the 3gpp site there are two series are there http://www.3gpp.org/ftp/Specs/html- info/06-


AMR Codec VAD

Started by Harsha in Speech Coding18 years ago 2 replies

Hi All,      Please let me know the actual difference between VAD option 1

Hi All,      Please let me know the actual difference between VAD option 1


AMR WB+ (fixed point) Frame duration

Started by chandresh in Speech Coding14 years ago 1 reply

Hi all,   I am trying to port ABR WB+ (fixed point baseline) to a particular platform. I want to calculate its MIPS consumption on...

Hi all,   I am trying to port ABR WB+ (fixed point baseline) to a particular platform. I want to calculate its MIPS consumption on this platform. I know, if   'X' =  Million instructions per frame on this platform 'T' =  Frame duration in seconds   then,  MIPS = X/T


Homing sequence test for g722.8

Started by Anonymous in Speech Coding14 years ago

Hi all,         I am working on AMR-Wb. I have downloaded the test vectors. there are some sequences for testing the...

Hi all,         I am working on AMR-Wb. I have downloaded the test vectors. there are some sequences for testing the homing sequences. how could i te