msm7719-01 Oki Semiconductor, msm7719-01 Datasheet - Page 32

• Manufacturer Part Number: msm7719-01
• Description: Echo Canceler With Adpcm Transcoder
• Manufacturer: Oki Semiconductor

¡ Semiconductor
B7 … Turns ON or OFF the VOX function
B6,5 …Setting of transmit side voice or silence detection level
Note: • The detection level is changeable by inserting the pad of –1dB to –5dB in addion to the alove
B4 … Setting of hangover time (T
B3 … VOX input signal (receiver side)
B2 … Setting of a receiver side background noise level
B1, 0… Externally-set background noise level
(8) CR7 (Detection register : read-only)
B7… Detection of transmit side voice or noise
B6, 5… Transmit side silence level (Indicator)
B4, 3, 2, 1, 0 … Reserved
(7)CR6 (VOX function control)
CR7
Initial value
CR6
Initial value
(0, 0) : –20 dBm0
(0, 1) : –25 dBm0
(1, 0) : –30 dBm0
(1, 1) : –35 dBm0
0: 160 ms 1: 320 ms
0: Transmits an internal background noise.
1: Transmits a voice reception signal.
Set the VOXI pin to “0” to use this data.
0: Reserved
(0, 0) : No noise
(0, 1) : –55 dBm0
(1, 0) : –45 dBm0
(1, 1) : –35 dBm0
0: Silence 1: Voice
(0, 0) : –10dB or less with respect to the detection level defined by CR6-B6, B5.
(0, 1) : –5 to –10 dB with respect to the detection level defined by CR6-B6, B5.
(1, 0) : –0 to –5 dB with respect to the detection level defined by CR6-B6, B5.
(1, 1) : –0 dB or more with respect to the detection level defined by CR6-B6, B5.
Note : The above outputs are valid only when the VOX function is enabled by bit 7 of CR6.
• Write 16384 ¥ 10
values.
Example: When –1dB pad is inserted, 16384 ¥ 10
=18383.15=18383d (eliminate after the decimal point)=47CFh
ON/OFF
VOX
OUT
VOX
B7
B7
0
0
(–A/20)
Silence level
LVL1
B6
B6
ON
1
0
0
at address “2DEh”.
VXOFF
Silence level
LVL0
) (See Figure 6.)
B5
ON
B5
0
0
0
0: OFF, 1: ON
TIME
INT
OFF
B4
B4
0
0
(– (–1)/20)
DET
CPT
VOX
B3
B3
IN
0
0
LEVEL SEL
RX. NOISE
DTMF
DET
B2
B2
0
0
RX. NOISE
LVL1
DETL
B1
B1
0
0
MSM7719-01
RX. NOISE
DETA
LVL0
32/40
B0
B0
0
0