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City of Santa Ana Public Library Renovation <br />Group 4 Architecture Research + Planning, Inc.Smith, Fause & McDonald Inc. <br />Group 4 Project No. 22575-01 Conform Set – August 2, 2024Bid Set Addendum-03 – June 05 <br />INTEGRATED AUDIOVISUAL SYSTEMS AND EQUIPMENT SECTION 27 4116-9 <br />5.Signal to Noise Ratio: The minimum acceptable ratio of signal to noise levels derived <br />from broadband measurements under design load at maximum output over the entire <br />range of the specified frequency response. <br />6.Clipping Level: The minimum acceptable maximum level of signal applied to the <br />device under design load conditions while fully in compliance with all other <br />performance specifications. <br />7.Sensitivity: The maximum acceptable level of input signal applied to the device that <br />is necessary to provide the maximum output under design load conditions. <br />8.Design Load: The load (in ohms) specified by usage of the particular device input or <br />output. <br />9.Composite Triple Beat Ratio: The ratio of visual carrier level to composite third order <br />distortion products. <br />10.Cross Modulation Ratio: The ratio of visual carrier level to coherent spurious signal <br />level (i.e. intermodulation products). <br />11.Carrier to Noise Ratio: The ratio of visual carrier to noise levels derived from <br />broadband measurements under design load at maximum output over the entire <br />range of the specified frequency response. <br />B.Signal Levels: The following voltage levels shall be considered the standard operating levels <br />for the particular circuitry, unless specifically noted otherwise (0.775 Volt = 0 dBu = 0 dbm for <br />a 600 ohms terminated circuit): <br />1.Microphone Circuits: -30 dBu or less. <br />2.Audio Line Level Circuits: -30 dBu to +24 dBu; equivalent to -30 dBm to +24 dBm for <br />a 600 ohms terminated circuit. <br />3.Loudspeaker Level Circuits: More than +24 dBu. <br />4.Video Line Level Circuits: 1.0 Volt, peak to peak composite signal. <br />5.Radio Frequency (RF), Television (MATV) Circuits: +6 to +72 dBmV (0 dBmV = <br />1,000 microvolts). <br />C.Characteristic Impedances: The following operating impedances shall be considered to be <br />the standard operating impedances for the particular circuitry, unless specifically noted <br />otherwise: <br />1.Microphone Circuits: 50-250 ohms source, 150-1500 ohms terminating, <br />electrostatically and electromagnetically balanced to ground. <br />2.Audio Line Level Circuits: 600 ohms maximum source, 600 ohms minimum <br />terminating, line to line, electrostatically and electromagnetically balanced to ground. <br />3.Video Line Level Circuits: 75 ohms maximum source, 75 ohms minimum terminating <br />to shield and signal ground, with Vertical Standing Wave Ratio (VSWR) not to exceed <br />1.2. <br />4.Radio Frequency (RF) Television Circuits: 75 ohms nominal to shield and signal <br />ground, with Vertical Standing Wave Ratio (VSWR) not to exceed 1.2. <br />1.11 SOFTWARE LICENSING <br />A.Provide licensing for Project-specific software programming at programmable devices. <br />B.Provide licensing and original software copies for each device provided under Work of this <br />Section that uses software for operation, configuration or control. <br />1.Provide licensing for required workstation operating systems, and required third party <br />software. <br />2.For the Control System, provide a complete copy of the source code, including the <br />device interface driver code modules. <br />C.Upgrade each software package to the release in effect at the end of the Warranty Period.