Nippon Telegraph and Telephone Corporation

Verance Corporation

Qualcomm Incorporated

Dai Yang

Takehiro Moriya

Noboru Harada

Rade Petrovic

Min Wang

Ananthapadmanabhan Arasanipalai Kandhadai

Vivek Rajendran

Daniel Jared Sinder

Jeremy Patrick Toman

Akio Jin

Kazunaga Ikeda

Alireza Heidari

Rade Petriovic

Methods, devices, and computer program products enable the embedding of forensic marks in a host content that is in compressed domain. These and other features are achieved by preprocessing of a host content to provide a plurality of host content versions with different embedded watermarks that are subsequently compressed. A host content may then be efficiently marked with forensic marks in response to a request for such content. The marking process is conducted in compressed domain, thus reducing the computational burden of decompressing and re-compressing the content, and avoiding further perceptual degradation of the host content. In addition, methods, devices and computer program products are disclosed that obstruct differential analysis of such forensically marked content.

Efficient and secure forensic marking in compressed domain

Methods of audio coding are described in which an excitation signal for a first frequency band of the audio signal is used to calculate an excitation signal for a second frequency band of the audio signal that is separated from the first frequency band.

Systems, methods, apparatus, and computer program products for wideband speech coding

After a call is established between two stations using a codec that has been negotiated during call setup, in-band signaling may be used between the two stations to change the codec that is to be used. The in-band signals are indicative that the station that is transmitting the in-band signals can operate with a second codec and are used to probe whether the receiving station can also operate with that second codec. If the receiving station detects and reacts to the in-band signals, then both stations change to communicate with the second codec. The second codec has compatible packet sizes of the deployed (originally negotiated) codec without any need of infrastructure upgrade and/or quality compromise to legacy phone users (i.e., stations that cannot operate with the second codec).

Codec deployment using in-band signals

Efficient and secure forensic marking in compressed

The average amplitude of the samples in a signal sample sequence X in a floating-point format is determined for each frame. If the average amplitude is greater than a predetermined value, an integer formatting partconverts the sequence X into a signal sample sequence Y in a 16-bit integer format by truncation, a compressing partcodes the sequence Y to output a code sequence Ca, a difference producing partproduces a difference signal Z that corresponds to the difference between the signal sample sequence X and a sequence Y' in the floating-point format converted from the sequence Y, and a compressing partperforms entropy coding on the least significant (23&#x2212;n) bits of a mantissa M of the difference signal Z, which is determined by the number of bits n following the most significant '1' in each sample in the sequence Y, and outputs a code sequence Cb. If the average amplitude is not greater than the predetermined value, the sequence X is directly losslessly coded by a compressing part. A code Cd, which indicates which coding is selected, is output.

Floating point signal reversible encoding method, decoding method, device thereof, program, and recording medium thereof

Signal samples X in a floating-point format, each of which is composed of 1 bit of sign S, 8 bits of exponent E and 23 bits of mantissa M, are converted through truncation by an integer formatting partinto signal samples Y in a 24-bit integer format, the integer-value signal samples Y are coded by a compressing partinto a code sequence Ca, and the code sequence Ca is output. According to the number of digits n following the most significant '1' in the integer-value signal sample Y, a difference producing partextracts the least significant (23&#x2212;n) bits from the mantissa M of the input signal sample X to form a difference signal Z, and a compressing partperforms entropy coding of the difference signal Z to produce a code sequence Cb and outputs the code sequence Cb. Alternatively, the difference signal Z may be output as it is, rather than being compressed.

Floating-point type digital signal reversible encoding method, decoding method, apparatuses therefor, and programs therefor

The average amplitude of the samples in a signal sample sequence X in a floating-point format is determined for each frame. If the average amplitude is greater than a predetermined value, an integer formatting partconverts the sequence X into a signal sample sequence Y in a 16-bit integer format by truncation, a compressing partcodes the sequence Y to output a code sequence Ca, a difference producing partproduces a difference signal Z that corresponds to the difference between the signal sample sequence X and a sequence Y' in the floating-point format converted from the sequence Y, and a compressing partperforms entropy coding on the least significant (23&#x2212;n) bits of a mantissa M of the difference signal Z, which is determined by the number of bits n following the most significant '1' in each sample in the sequence Y, and outputs a code sequence Cb. If the average amplitude is not greater than the predetermined value, the sequence X is directly losslessly coded by a compressing partA code Cd, which indicates which coding is selected, is output.

Digital signal samples X in a floating-point format, each of which is composed of 1 bit of sign, 8 bits of exponent E and 23 bits of mantissa M, are converted through rounding by an integer formatting partinto digital signal samples Y in an integer format, the sequence of the digital signal samples Y is losslessly compression-coded by a compressing partinto a code sequence Ca, and the code sequence Ca is output. The digital signal samples Y are converted by a floating point formatting partinto digital signal samples X' in the floating-point format, a difference signal &#x394;X indicating the difference between the digital signal sample X&#x2032; and the digital signal sample X is determined by a subtraction part, the difference signal &#x394;X is losslessly coded, and the resulting code sequence Cb is output.

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