Wave File Player

Purpose

Plays a user specified WAV file. The WAV file must be 16 bit/mono format. The chosen Wave File Player must match the sample rate of the system. For example, in a 44.1kHz system, the 11.025 kHz, 22.05 kHz, or 44.1 kHz Wave Players can be used. If the WAV file sample rate does not match the player sample rate, the file will play, but at a different pitch/speed than what it was recorded at.

The Frame used will be one factor in determining how many wave players can be playing at the same time in a view file without problems. If the Frame uses PCI or AGP video, then 2 or 3 players running full sample rate wave files (32, 44.1, or 48 kHz) should be possible. Wave Players running at ½ the system sampling rate (16, 22.05, or 24 kHz) will allow more players to play simultaneously, and players running at ¼ the system sampling rate (8, 11.025, or 12 kHz) will allow even more. The reason for this limitation is that this is the only MediaMatrix device that sends audio over the very limited bandwidth ISA computer bus. It uses the computer's ISA bus to get the wave file from the computer's hard disk to the DSP boards. An ISA video card must get its display instructions from the computer over this same ISA bus. A PCI or AGP video card does not use the ISA bus, leaving more bandwidth for Wave Players. If too many Wave Players are attempting to play at the same time in a system, then some or all of the players will experience dropouts in their audio. This will be worst if many meters are on screen, or if controls are being moved. The only way to determine if the number of simultaneously running Wave Players will work cleanly in a given view file is to try it.

Note: This is not a limitation on the number of Wave Players that can exist in a given view file at the same time. Rather it is a limitation on the number of players that can be playing at the same time.

Controls

File

File name of WAV file to play. If the WAV file is located in the views sub-directory of the directory the MediaMatrix software is installed in (usually C:\Peavey), then all that is required is to enter the file name of the WAV file while in Control Mode. For example "My Sounds.wav" (enter without the quotation marks). If the WAV file is located elsewhere, you must enter the complete path to the WAV file. For example, "C:\Projects\Big Project\Sounds\My Sounds.wav". Note that in either case you must use the .wav extension on the end of the file name.

The file to be played must be a Windows standard wave file. It must be recorded at one of the three acceptable sampling rates for the sampling rate of the MediaMatrix system. If the MediaMatrix system is running with a sampling rate of 48 kHz, then the wave file must be at either 48 kHz, 24 kHz, or 12 kHz. If the MediaMatrix system is running at a sampling rate of 44.1 kHz, then the wave file must be at either 44.1 kHz, 22.05 kHz or 11.025 kHz. If the MediaMatrix system is running at a sampling rate of 32 kHz, then the wave file must be at either 32 kHz, 16 kHz or 8 kHz. The wave file must also be 16 bits and mono. If you wish to use a wave file that does not meet any of these criteria, then you must convert the wave file to the required format. There are digital audio editing programs available with the capability to do these conversions.

Level

Sets the level of the wave player output.

Loop

Enable looped playback of wav file. When this control is engaged, and the play button is pressed, the wave file will play repeatedly until the stop or pause buttons are pressed.

Hint: If you wish to have a pause between repetitions of the file, use a digital audio editing program to add the desired amount of silence to the end of the wave file.

Pause

Pause playback of wav file.

Play

Start playback of wav file.

Rewind

Reset playback pointer to beginning of file. The next time it is played, it will start at the beginning.

Valid

Indicates that the selected wave file was found and is a supported format.