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MT93L16 Datasheet(PDF) 5 Page - Mitel Networks Corporation |
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MT93L16 Datasheet(HTML) 5 Page - Mitel Networks Corporation |
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5 / 27 page  Preliminary Information MT93L16 5 Howling Detector (HWLD) 4 (4. Patent Pending) The Howling detector is part of an Anti-Howling control, designed to prevent oscillation as a result of positive feedback in the audio paths. The HWLD can be disabled by setting the AH- bit to 1 in the (MC) control register. Offset Null Filter To ensure robust performance of the adaptive filters at all times, any DC offset that may be present on either the Rin signal or the Sin signal, is removed by highpass filters. These filters have a corner frequency placed at 40Hz. The offset null filters can be disabled by setting the HPF- bit to 1 in the LEC or AEC control registers. Limiters To prevent clipping in the echo paths, two limiters with variable thresholds are provided at the outputs. The Rout limiter threshold is in Rout Limiter Register 1 and 2. The Sout limiter threshold is in Sout Limiter Register. Both output limiters are always enabled. User Gain The user gain function provides the ability for users to adjust the audio gain in the receive path (speaker path). This gain is adjustable from -24dB to +21dB in 3dB steps. It is important to use ONLY this user gain function to adjust the speaker volume. The user gain function in the MT93L16 is optimally placed between the two echo cancellers such that no reconvergence is necessary after gain changes. The gain can be accessed through Receive Gain Control Register. AGC The AGC function is provided to limit the volume in the speaker path. The gain of the speaker path is automatically reduced during the following conditions: • When clipping of the receive signal occurs. • When initial convergence of the acoustic echo canceller detects unusually large echo return. • When howling is detected. The AGC can be disabled by setting the AGC- bit to 1 in MC control register. Mute Function A pcm mute function is provided for independent control of the Receive and Send audio paths. Setting the MUTE_R or MUTE_S bit in the MC register, causes quiet code to be transmitted on the Rout or Sout paths respectively. Quiet code is defined according to the following table. Bypass Control A PCM bypass function is provided to allow transparent transmission of pcm data through the MT93L16. When the bypass function is active, pcm data passes transparently from Rin to Rout and from Sin to Sout, with bit-wise integrity preserved. When the Bypass function is selected, most internal functions are powered down to provide low power consumption. The BYPASS control bit is located in the main control MC register. Adaptation Enable/Disable Adaptation control bits are located in the AEC and LEC control registers. When the ADAPT- bit is set to 1, the adaptive filter is frozen at the current state. In this state, the device continues to cancel echo with the current echo model. When the ADAPT- bit is set to 0, the adaptive filter is continually updated. This allows the echo canceller to adapt and track changes in the echo path. This is the normal operating state. MT93L16 Throughput Delay In all modes, voice channels always have 2 frames of delay. In ST-BUS/GCI operation, the D and C channels have a delay of one frame. LINEAR 16 bits 2’s complement SIGN/ MAGNITUDE µ-Law A-Law CCITT (G.711) µ-Law A-Law +Zero (quiet code) 0000h 80h FFh D5h Table 1 - Quiet PCM Code Assignment |
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