PEB3265 Infineon Technologies Corporation, PEB3265 Datasheet - Page 64

• Manufacturer Part Number: PEB3265
• Description: (PEB326x / PEB426x) Dual Channel Slicofi-2 / Slic Duslic
• Manufacturer: Infineon Technologies Corporation

DuSLIC
Functional Description
Preliminary
The enhanced Signal Processing Capabilities are available only for the DuSLIC-E/-E2/
-P versions, with an exception of DTMF generation.
The DTMF generation is available for all DuSLIC versions.
The functions of the EDSP are configured and controlled by POP register settings (see
Chapter
6.2.3).
1)
3.8.1
DTMF Generation and Detection
Dual Tone Multi-Frequency (DTMF) is a signaling scheme using voice frequency tones
to signal dialing information. A DTMF signal is the sum of two tones, one from a low
group (697 - 941 Hz) and one from a high group (1209 - 1633 Hz), with each group
containing four individual tones. This scheme allows 16 unique combinations. Ten of
these codes represent the numbers from zero through nine on the telephone keypad, the
remaining six codes (*, #, A, B, C, D) are reserved for special signaling. The buttons are
arranged in a matrix, with the rows determining the low group tones, and the columns
determining the high group tone for each button.
In all SLICOFI-2x codec versions the 16 standard DTMF tone pairs can be generated
independently in each channel via two integrated tone generators. Alternatively the
frequency and the amplitude of the tone generators can be programmed individually via
the digital interface. Each tone generator can be switched on and off. The generated
DTMF tone signals meet the frequency variation tolerances specified in the ITU-T Q.23
recommendation.
1)
Both channels (A and B) of SLICOFI-2
have a powerful built-in DTMF decoder that will
meet most national requirements. The receiver algorithm performance meets the quality
criteria for central office/exchange applications. It complies with the requirements of ITU-
T Q.24, Bellcore GR-30-CORE (TR-NWT-000506) and Deutsche Telekom network
(BAPT 223 ZV 5, Approval Specification of the Federal Office for Post and
Telecommunications, Germany).
The performance of the algorithm can be adapted according to the needs of the
application via the digital interface (detection level, twist, bandwidth and center
frequency of the notch filter).
1)
DTMF Detection only available for DuSLIC-E/-E2/-P
Data Sheet
64
2000-07-14