For MME,WDS or WASAPI we must manually set Input and Output ports. WASAPI driver is for Vista/Windows 7 and brings new features: very low latency (3ms), possibility of exclusive access to the sources of audio signals, and others.ģ If you select the ASIO audio drivers then the Input and Output fields are filled automatically (with audio card utility program set input/output ports). After driver installation must be run configuration software utility and manually set the input/output audio ports. If the hardware manufacturer does not provide ASIO drivers for your sound card from internet download alternative ASIO4ALL drivers: and install on the system. ASIO driver have lowest latency (5-20ms) but with a smaller number of supported audio cards. Windows DirectSound is part of the advanced driver library with additional features but with slightly higher CPU occupancy and lower latency (obsolete and abandoned audio subsystem). Characteristics are 16 bit sampling resolution, less CPU usage and larger latency (this time can be manually adjust in range of ms depending on the used sound card, recommended starting value is 50 ms). Depending on the operating system and software installed on system, there are several possibilities: MME stands for Multi Media Extension and gives support for the standard Windows audio system. Configuration starts with choice of audio Driver.
If you do not have card from supported list, select the Unsupported Card ("supported cards" just means that certain parameters are set automatically, which is good for beginners but you can be limited later in the parameter fine tuning). It is better to use high quality 24 bit audio card with ASIO or WASAPI drivers.Ģ After radio is connected to a PC must be set GSDR audio subsystem using the Setup-> Audio: It starts from selecting the right audio card choice. For basic tests with SDR radio this configuration is sufficient but integrated sound card is not for any serious work. Warning: Some laptops do not have Stereo Line-in input, and can not be used for the SDR! Picture shows minimal configuration to work with the SDR radio with CW modulation type and consists of a PC with only one sound card with stereo Line-input and Line-outtput. First connect your SDR radio with a sound card: Pay attention to the Stereo! label: in SDR terminology signals named I/Q are associated with the Left/Right audio channel on your sound card. 1 GSDR audio subsystem For proper operation of SDR radios, based on the sound card, it is crucial to properly set up audio subsystem.
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