Lines Matching +full:audio +full:- +full:related
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6 <title>Radio CHU Audio Demodulator/Decoder</title>
10 <h3>Radio CHU Audio Demodulator/Decoder</h3>
13 <!-- #BeginDate format:En2m -->17-Jul-2014 02:17<!-- #EndDate -->
20 Modem Port: <tt>/dev/chu<i>u</i></tt>; 300 baud, 8-bits, no parity<br>
21 Autotune Port: <tt>/dev/icom</tt>; 1200/9600 baud, 8-bits, no parity<br>
22 Audio Device: <tt>/dev/audio</tt> and <tt>/dev/audioctl</tt>
25 …from Canadian time/frequency station <a href="http://inms-ienm.nrc-cnrc.gc.ca/time_services/shortw…
31 …audio codec or soundcard, or a Bell 103-compatible, 300-b/s modem or modem chip, as described on t…
32 …d ray geometry. In Newark DE, 625 km from the transmitter, the predicted one-hop propagation delay…
33 …r, the mean offset with a 2.4-GHz P4 running FreeBSD 6.1 is generally within 0.2 ms short-term wit…
35 …audio drivers such as described in the <a href="driver36.html">Radio WWV/H Audio Demodulator/Decod…
37 <p>The driver processes 8-kHz μ-law companded codec samples using maximum-likelihood techniques …
38 …-ienm.nrc-cnrc.gc.ca/time_services/chu_e.html">CHU website</a>. A timecode is assembled when all b…
40 …-likelihood UART, burst assembler and majority decoder. The DSP modem demodulates Bell 103 modem a…
41 …-stage shift registers, one for each of eight phases of the 300-b/s bit clock. At each phase a new…
42 …-robin order as the phases of each bit arrive. At the end of each bit all eight phases are searche…
43 <p>The burst assembler processes characters either from the maximum-likelihood UART or directly fro…
44 …-character blocks, each block representing ten 4-bit BCD digits. The format B blocks sent in secon…
45 …B burst the second block is bit-inverted relative to the first, so a perfect burst of five 8-bit c…
47 …-bit code combination that might be decoded at that position. In order to use the character timest…
49 … is the distance for that position and the corresponding code is the maximum-likelihood digit. If …
50 <p>The result of the majority decoder is a nine-digit timecode representing the maximum-likelihood …
51 …face can handle is 60. These are processed using a median filter and trimmed-mean average, so the …
53 …-V standard, which is a bidirectional serial bus operating at TTL levels. The bus can be connected…
54 …-kHz offset is useful with a narrowband SSB filter where the passband includes the carrier an…
55 …bursts are received from one or more stations, the driver operates in a five-minute cycle. During …
57 …mecode and related status and error counters, even when the program is not discipline the system c…
60 …-11) and <tt>b</tt> the burst distance (0-40). Good bursts will have spans of a 800 or more and th…
61 …-V interface for ICOM radios is active, a debug level greater than 1 will produce a trace of the C…
78 agc audio gain (0-255)
83 …d are in fixed-length format. The <tt>agc</tt> and <tt>lset</tt> fields, as well as the following …
88 …<dd>The quality character is a four-bit hexadecimal code showing which alarms have been raised dur…
111 …<dd>The audio gain shows the current codec gain setting in the range 0 to 255. Ordinarily, the rec…
114 code, if the CI-V interface is active, or <tt>CHU</tt> if not. The radio
135 …<dd>When the audio driver is compiled, this flag selects the audio input port, where 0 is the mike…
137 …<dd>When the audio driver is compiled, this flag enables audio monitoring of the input signal. For…