DirectX Filter: Stereo MPX & RDS Generator

Imebatilisha Ilichapishwa Mar 10, 2005 Kulipwa wakati wa kujifungua
Imebatilisha Kulipwa wakati wa kujifungua

We are currently seeking a skilled DirectX Developer (preferably a Delphi programmer) to design a DirectX filter capable of generating a stereo MPX signal.

Specifications of a stereo MPX Signal can be found at:

<[url removed, login to view]~ic/[url removed, login to view]>

Essentially the filter will:

* Permit all sample rates and all bit rates to be used

* Operate on 50us and 75us pre-emphasis

* Permit an on/off function. In the "off" mode the filter shall pass the input audio directly to the output.

* Permit a stereo/mpx/mono function. In the "stereo" mode the filter does not apply MPX to the signal. In "mono" mode the channels are combined and sent to the output.

* Permit fine tuning of the 19kHz pilot tone (+/- 2%)

* Permit a 19kHz "oversampling" function.

* Permit "baseband clipping" on/off

* Permit brickwall limiting at 15kHz on/off

* Permit 15kHz overshoot clipping

* Permit better than 60db stereo seperation (digitally this should be a) easy b) equal to the seperation of the stereo source whether file or line in. Stereo seperation applies from 20Hz - 15kHz

* > 60dbr spurious rejection at 80kHz

* > 80dbr rejection at 160kHz

* > 60db rejection of common mode input.

RDS Specifications for the filter can be found at:

<[url removed, login to view]>

The filter should cater for all program and service types.

Any questions, please feel free to ask.

## Deliverables

1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done.

2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables):

a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment.

b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request.

3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement).

## Platform

* Delphi (7 or higher)

* DirectX 9c

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