supply quality software for DSP-related functions in the field of electronics.
Specialising in telecoms and audio applications, we have a range of code
modules in the following
categories: telephone modem data pumps, telephony signal interfacing eg
Caller ID, DTMF, audio and speech coding, and utility components such
as FFT. The modules have 2 software formats: assembler for the Texas
TMS320C5000 range of DSP processors, and C for
DSP-/micro-processors in general. We
can also generate bespoke code and
perform contract work / consultancy in the field of DSP. We have much
experience in designing and implementing from scratch.
target customers are manufacturers.
(asm) code: the TI ‘C5000 range of fixed-point DSPs is well established in many applications, from mobile
phones to digital cameras. The
range features high processing power, large on-board memory, low current
consumption and low unit cost. The
assembler format is highly efficient in minimising DSP processing power,
data-, and program-memory usage. Each module has a C “wrapper” if required
but can be operated at the assembler interface. The code here runs on
both the 'C55x and 'C54x sub-ranges, being written in the ‘C54x ssembler.
code: in this form, the code modules can operate on any processor
that has an ANSI C compiler. The C coding is designed especially for efficient
operation on low-cost fixed-point DSP- and general-purpose micro-processors.
All data memory is specified as 16-bit integer words.
Multiplies are integer 16x16-bit with 32-bit products. The assembler
and C versions of each particular function are “bit-exact” in execution.
Code module design: each has been
carefully crafted to give excellent signal performance whilst minimising
processor resource usage. For example, the modem code modules have many
novel elements to give excellent error rate / signal-to-noise ratio (SNR)
figures over both flat and poor channels.
module features: operation is by callable subroutines with
uncomplicated interfaces. Permanent
data memory is passed normally by a single address pointer. This allows
the user much flexibility in implementing multiple channels and in overlaying
memory. All functions, apart from
resource needs, are platform-independent. The source code is thoroughly
commented for easy maintenance.
module purchase: is under simple licenses, usually for a one-time
fee. Modules are supplied with user's guides and example test files to
illustrate code interfaces and operation. Integration support can be provided.
Jan 2022: Bell
212(A) Modem asm
Sep 2019: change of telephone number
Jan 2019: addition of V.42 Error Correction DSP C