Re: [Discuss-gnuradio] The format of I/Q sample

2011-08-15 Thread yooxi
Hi, Marcus, Thanks a lot! We will look into the UHD source code. Best regards, Yooxi Marcus D. Leech wrote: > >> Hi, Marcus, >> >> Thanks a lot for your quick reply! >> Then start from where, the integers become floating point numbers? >> I'd like to see how they are converted. >> >> Thanks,

Re: [Discuss-gnuradio] The format of I/Q sample

2011-08-15 Thread Marcus D. Leech
Hi, Marcus, Thanks a lot for your quick reply! Then start from where, the integers become floating point numbers? I'd like to see how they are converted. Thanks, Yooxi They are never floating-point numbers inside the FPGA or on the host interface. For UHD, they get scaled and converted insi

Re: [Discuss-gnuradio] The format of I/Q sample

2011-08-15 Thread yooxi
Hi, Marcus, Thanks a lot for your quick reply! Then start from where, the integers become floating point numbers? I'd like to see how they are converted. Thanks, Yooxi Marcus D. Leech wrote: > > On 08/15/2011 01:22 PM, xi yang wrote: >> Hi, Tom, >> >> Thanks a lot for your prompt reply! >> Do

Re: [Discuss-gnuradio] The format of I/Q sample

2011-08-15 Thread Marcus D. Leech
On 08/15/2011 01:22 PM, xi yang wrote: Hi, Tom, Thanks a lot for your prompt reply! Do you mean on the Transmitting side? I want to know how 32-bit floating point number is converted to 16bits or from 16bits to 32bits. Where can I find the file that performs this conversion? We are actually w

Re: [Discuss-gnuradio] The format of I/Q sample

2011-08-15 Thread xi yang
Hi, Tom, Thanks a lot for your prompt reply! Do you mean on the Transmitting side? I want to know how 32-bit floating point number is converted to 16bits or from 16bits to 32bits. Where can I find the file that performs this conversion? We are actually working on the Receiving side. Before we mov

Re: [Discuss-gnuradio] The format of I/Q sample

2011-08-15 Thread Tom Rondeau
On Mon, Aug 15, 2011 at 12:48 AM, xi yang wrote: > Hi, all > > I want to use fpga to do FFT before the data are transmitted to usb. > > In FFT module, I used float point numbers to be its input. According to the > IEEE Floating-Point Standard, a float point number is represented by 32 bits > (bits

[Discuss-gnuradio] The format of I/Q sample

2011-08-14 Thread xi yang
Hi, all I want to use fpga to do FFT before the data are transmitted to usb. In FFT module, I used float point numbers to be its input. According to the IEEE Floating-Point Standard, a float point number is represented by 32 bits (bits 0 through 22 form the mantissa, bits 23 through 30 form the e